The Washington State Child Support Schedule (WSCSS) Worksheets are the mandatory court forms every Washington parent must file in any case that sets, changes, or enforces child support, including divorce, legal separation, paternity, parenting plan, and modification cases. The worksheets translate each parent’s gross income, allowed deductions, and shared expenses into a presumptive monthly transfer payment using the Washington Economic Table under RCW 26.19.020, and the judge cannot enter a final support order without them.
Washington courts processed more than 50,000 family law cases involving child support in the last reporting year, and the Administrative Office of the Courts reports that worksheet math errors and missing income documents are the single biggest reason support orders get kicked back at the ex parte calendar. Filing the worksheets correctly the first time saves weeks of delay, prevents back-support surprises, and protects you from a perjury finding under the signature block.
Here is what you will learn in this guide:
- 📄 What the WSCSS Worksheets are, who must file them, and when they are due in your case
- 🧮 How to fill out every line of the Child Support Worksheet, the Income Worksheet, and the Worksheet for Imputed Income
- 👨👩👧 Three full named-filer walkthroughs covering the most common Washington fact patterns
- 📬 How to file the worksheets in person, by mail, or through eFileWA, with fees, processing times, and proof of filing
- ⚠️ The 10 most common mistakes parents make on the worksheets and the exact consequence of each error
What the WSCSS Worksheets Are and Who Must File Them
The WSCSS Worksheets are a packet of standardized financial forms published by the Washington Administrative Office of the Courts that every parent in a child support case must complete under RCW 26.19.035. The packet includes Form WSCSS-Worksheets (the main Child Support Worksheet), the Worksheet for Income Calculation, the Worksheet for Imputed Income when one parent is voluntarily unemployed or underemployed, and the printable WSCSS Instructions booklet. The current revision is dated 2026 and replaces all earlier versions; using an outdated version is grounds for rejection at filing.
Any parent involved in a Washington divorce, legal separation, paternity action, parentage finding, modification of support, or Division of Child Support administrative order must file the worksheets. That includes parents who agree on the support amount, parents who disagree, and parents asking the court to deviate from the standard calculation. Even when DCS initiates an administrative action, the worksheets are still the math backbone of the order.
The worksheets serve four jobs at once: they prove each parent’s net income, apply the statutory Economic Table, allocate health care and daycare costs, and document any reason the court should deviate from the presumptive amount. Skipping the worksheets, or filing them with blank lines, means the court has no legal basis to enter support, and the case stalls until you refile.
Before You Start: Documents and Information You Need
Gathering the right paperwork before you open the worksheet PDF saves hours of back-and-forth and keeps your numbers defensible if the other parent challenges them. Washington’s Sealed Financial Source Documents rule under GR 22 means most of these documents get filed in a sealed cover sheet, not in the public file, but the court and the other side will still review them.
Use this pre-filing checklist:
- The last two years of complete federal tax returns with all schedules and W-2s, because the court compares your reported gross income to your tax filings, and a mismatch flags the worksheet for review.
- Your six most recent pay stubs, because the court averages year-to-date earnings to test whether your stated income is current and accurate.
- Proof of mandatory deductions like FICA, Medicare, state industrial insurance, and union dues, because only mandatory deductions reduce gross income under RCW 26.19.071(5).
- Health insurance premium statements showing the child-only portion, because only the child’s share of the premium goes on the worksheet, not the parent’s portion.
- Daycare and childcare invoices for the last 12 months, because the court averages work-related childcare and pro-rates it between the parents.
- Documentation of any other children you support, including existing court orders, because prior-born and subsequent-born children adjust your available income.
- Self-employment profit and loss statements with depreciation add-backs, because RCW 26.19.071(3)(g) requires adding back accelerated depreciation that the IRS allowed.
- Proof of any disability, Social Security, VA, unemployment, or pension income, because all of these count as gross income under the schedule.
- The other parent’s last known income information if you have it, because the court can impute income to a missing or non-cooperating parent under RCW 26.19.071(6).
- The children’s full legal names and dates of birth, because the worksheet requires them on the first page and a wrong birthdate can void the support calculation when a child ages out.
Where to Get the Form and How to Access It
The official, fillable WSCSS packet lives on the Washington Courts WSCSS forms page and is the only version judges accept. Download the PDF directly rather than using a screenshot or a third-party copy, because the AOC updates the Economic Table values and the form fields together, and an old PDF will pull old numbers.
You can also use the free Washington State Child Support Calculator maintained by DCS, which auto-fills the worksheet from your inputs and produces a court-ready PDF. The calculator is the fastest route for most pro se filers because it does the Economic Table lookup, the proportional share math, and the rounding for you. Print the calculator output, sign it, and file it just like a hand-completed worksheet.
If you are working with a lawyer or a court facilitator, they typically use a paid program such as Support Calculator or the WashingtonLawHelp self-help packet that wraps the same WSCSS math in a guided interview. The output PDF is identical in structure to the AOC form. Counties such as King County, Pierce County, and Spokane County also offer drop-in facilitator help where staff will review your worksheet before filing.
Step-by-Step: How to Fill Out the WSCSS Worksheets Line by Line
The worksheet is organized into a caption block, Part I (Income), Part II (Available Income), Part III (Standard Calculation), Part IV (Health Care, Daycare, and Special Expenses), Part V (Gross Child Support Obligation), Part VI (Standard Calculation/Transfer Payment), Part VII (Additional Factors for Consideration), Part VIII (Other Factors for Consideration), and the signature block. Work top-to-bottom in order, because each part feeds the next.
Caption Block: Court, County, Case Number, and Parties
The caption is the box at the very top of page 1 that identifies the court and the case. It asks for the Superior Court county, the cause number, the petitioner’s name, and the respondent’s name. Match the caption exactly to the petition or response already on file, including punctuation and middle initials.
To answer it, write the county name in all caps where it says “Superior Court of Washington, County of ___,” then drop the cause number into the “No.” line in the format printed on the summons (for example, 25-3-01234-5 SEA in King County). Type the petitioner’s full legal name on the “Petitioner” line and the respondent’s full legal name on the “Respondent” line.
For example, Maria Lopez writes “KING” in the county line, 25-3-04567-1 SEA in the cause number line, Maria Lopez in the petitioner line, and David Lopez in the respondent line.
A common nuance is paternity or parentage cases, where the parties may be labeled “Petitioner” and “Other Parent” rather than petitioner and respondent. Use whatever labels appear on your existing pleadings.
The most common mistake is mistyping the cause number, which causes the clerk to file the worksheet in the wrong case or reject it entirely, costing you the filing date.
A misconception is that the caption is decorative. It is not; the caption is what the clerk uses to electronically route the worksheet to your judge.
Children Listed on the Worksheet
Right under the caption, the form asks you to list the children for whom support is being calculated, with each child’s full name and date of birth. This block determines how many children the Economic Table lookup will use.
Write each child’s full legal name as it appears on the birth certificate and the date of birth in MM/DD/YYYY format. Only include the children who are the subject of this case, not stepchildren and not adult children.
For example, Carlos Lopez writes Sofia Lopez, 04/12/2017 and Mateo Lopez, 09/03/2020 in the children block.
A nuance is when a child turns 18 during the case. List the child anyway and address the age-out separately in Part VII, because removing the child from the block changes the Economic Table column.
The most common mistake is including a child from a prior relationship in this block. That child belongs in Part II, Line 2c (other children), not the main children list, and listing them here inflates the support amount.
A misconception is that the order of the children matters. It does not, but the names must match the final order or the clerk will require a corrected worksheet.
Part I, Line 1: Gross Monthly Income
Line 1 asks for each parent’s gross monthly income from all sources before any deductions. Gross monthly income under RCW 26.19.071(3) includes wages, salaries, commissions, bonuses, self-employment net profit, interest, dividends, pensions, Social Security, VA benefits, unemployment, workers’ compensation, and most other recurring income.
To answer it, total your gross income for the last 12 months, divide by 12, and round to the nearest whole dollar. For hourly workers, multiply your hourly rate by your average weekly hours, then multiply by 4.333. Enter the result in your column.
For example, Janet Kim earns $84,000 a year as a nurse, so she enters $7,000 on Line 1 in her column.
A nuance is irregular income such as overtime, bonuses, or seasonal work. Average those over 24 months rather than 12 to smooth out spikes, and attach the calculation to your Sealed Financial Source Documents.
The most common mistake is entering net pay instead of gross pay. Net pay understates your income, the other side will flag it, and the court will recalculate using your gross.
A misconception is that one-time gifts or tax refunds are income. They are not under the schedule, but recurring family support payments are.
Part I, Lines 1a–1h: Income Sources Breakdown
Lines 1a through 1h break gross income into categories: wages and salaries, interest and dividends, business income, maintenance received, other income, and imputed income if applicable. The categories let the court see where your money comes from and whether any of it is volatile.
To answer them, fill in each line that applies and leave non-applicable lines blank or zero. The total of 1a–1h must equal Line 1.
For example, Marcus Reed enters $5,200 on Line 1a (wages), $800 on Line 1c (Schedule C net profit from his side gig), and totals $6,000 on Line 1.
A nuance is rental income. Report gross rents on 1c and deduct only the operating expenses the IRS allows, but add back depreciation under RCW 26.19.071(5)(h).
The most common mistake is forgetting to add back depreciation on Schedule E or Schedule C, which artificially lowers self-employment income and triggers a contempt motion later.
A misconception is that cash tips are invisible. Tips are gross income, and the court will impute them based on industry averages if you under-report.
Part II, Line 2: Monthly Deductions from Gross Income
Line 2 lists the only deductions Washington allows: federal income tax actually owed, FICA (Social Security and Medicare), state industrial insurance, mandatory union dues, mandatory pension contributions, spousal maintenance actually paid under a court order, and the support of other dependent children. Discretionary deductions like 401(k) contributions, health insurance premiums on yourself, or wage garnishments are not allowed here.
To answer it, total each allowed deduction for the month and enter the sum on Line 2. Use your actual federal tax liability from your most recent return, not the amount withheld.
For example, Aisha Brown deducts $650 FICA, $180 state industrial insurance, $95 union dues, and $1,200 federal income tax actually owed, for a Line 2 total of $2,125.
A nuance is when withholding is much higher than actual tax owed. Use the actual tax owed from your 1040 line 24, not the withholding from your W-2 box 2, or the court will recalculate.
The most common mistake is deducting health insurance premiums on Line 2. Health insurance for the children belongs in Part IV, not Part II, and double-counting it inflates the deduction.
A misconception is that voluntary 401(k) contributions count. They do not under RCW 26.19.071(5), even if your employer matches them.
Part II, Line 3: Monthly Net Income
Line 3 is simple subtraction: Line 1 minus Line 2 equals net monthly income. This number drives every downstream calculation.
To answer it, subtract Line 2 from Line 1 in each parent’s column and write the result on Line 3. Round to the nearest whole dollar.
For example, Janet Kim subtracts $1,820 (Line 2) from $7,000 (Line 1) and writes $5,180 on Line 3.
A nuance is when Line 2 exceeds Line 1, which can happen for a parent on temporary disability with high deductions. Enter zero, not a negative number, and explain in Part VII.
The most common mistake is arithmetic error. Use a calculator, because a $5 mistake on Line 3 cascades into a wrong transfer payment.
A misconception is that Line 3 is the same as take-home pay. It is not, because mandatory deductions are narrower than payroll deductions.
Part II, Line 4: Combined Monthly Net Income
Line 4 adds both parents’ Line 3 numbers together. The combined figure is what the Economic Table reads.
To answer it, add the petitioner’s Line 3 and the respondent’s Line 3 and write the total in the “Combined” column on Line 4. There is no per-parent breakdown on Line 4.
For example, Sofia and Mateo’s parents add Maria’s $4,820 and David’s $5,180 for a Line 4 of $10,000.
A nuance is the Economic Table cap. Under RCW 26.19.020, combined net income above $12,000 per month is subject to judicial discretion, and you must explain any upward deviation in Part VII.
The most common mistake is plugging in gross income instead of net. The Economic Table is built on net income, and a gross-income lookup overstates support by 25 percent or more.
A misconception is that the table tops out forever at $12,000. The advisory cap exists, but courts routinely set support above it for higher earners using extrapolation.
Part III, Line 5: Each Parent’s Share of Income
Line 5 calculates each parent’s percentage share of the combined net income. This percentage allocates everything that follows, including the basic support obligation and the add-ons.
To answer it, divide each parent’s Line 3 by the Line 4 total and express the result as a decimal to four places (for example, 0.4820). The two percentages must sum to 1.0000.
For example, David Lopez divides $5,180 by $10,000 and writes 0.5180 in his column on Line 5.
A nuance is when one parent has zero income. The other parent’s share is 1.0000, but the court still expects the zero-income parent to pay the presumptive minimum of $50 per child per month under RCW 26.19.065.
The most common mistake is rounding to two decimals. Two-decimal rounding throws off the proportional shares of childcare and health care by several dollars per month, which compounds over years.
A misconception is that a parent with custody pays a smaller share. Line 5 ignores residential time entirely; it is purely income-based.
Part IV, Line 6: Basic Child Support Obligation from the Economic Table
Line 6 is the basic monthly child support obligation pulled from the Economic Table for the combined net income on Line 4 and the number of children. The table gives a per-child amount and a total.
To answer it, open the current Economic Table, find the row for your Line 4 combined net income, find the column for the number of children, and enter the per-child amount. Multiply by the number of children for the total Line 6.
For example, with $10,000 combined net income and two children, the Lopez worksheet shows $1,279 per child, or $2,558 on Line 6.
A nuance is age tiers. The table has separate rows for children under 12 and children 12 and older, and you must blend the amounts when one child is in each tier.
The most common mistake is reading the wrong age column. The 12-and-over amount is roughly 25 percent higher, and a wrong column under-pays by hundreds of dollars per month.
A misconception is that the table number is the final transfer payment. It is only the basic obligation; add-ons in Part V and the proportional share in Part VI come next.
Part IV, Line 7: Each Parent’s Share of the Basic Obligation
Line 7 multiplies the Line 6 obligation by each parent’s Line 5 share. This is each parent’s dollar contribution to the basic support amount before add-ons.
To answer it, multiply Line 6 by the petitioner’s Line 5 percentage, then by the respondent’s Line 5 percentage. Enter each result in the corresponding column.
For example, David Lopez multiplies $2,558 by 0.5180 and writes $1,325 in his column on Line 7.
A nuance is rounding. Round each product to the nearest whole dollar, but keep the underlying percentages at four decimals to avoid drift.
The most common mistake is forgetting to multiply by Line 5 and instead splitting Line 6 in half. A 50/50 split only works when both parents earn exactly the same.
A misconception is that Line 7 is the transfer payment. It is the proportional share of the basic obligation only, not the final amount.
Part V, Lines 8–11: Health Care, Daycare, and Special Child Rearing Expenses
Lines 8 through 11 capture monthly health insurance premiums for the children, uninsured medical expenses, work-related daycare, education costs, long-distance transportation for visitation, and other special expenses agreed by the parents or ordered by the court. These add to the basic obligation and are split by the Line 5 percentages.
To answer them, list the actual monthly amount on each line that applies and leave the rest blank. Pro-rate annual expenses (such as school tuition) into a monthly figure by dividing by 12.
For example, Aisha Brown enters $220 on Line 8a for the children’s portion of the health premium and $850 on Line 8c for after-school daycare.
A nuance is the child-only premium. Use the difference between the family premium and the employee-only premium, not the full family premium, because only the children’s share counts.
The most common mistake is entering the full family premium on Line 8a. The other parent will challenge it, and the court will reduce it to the child-only share.
A misconception is that extracurricular activities like soccer or summer camp are special expenses. They are not unless both parents agree in writing or the court orders them.
Part VI, Line 12: Gross Child Support Obligation and Transfer Payment
Line 12 is the standard calculation transfer payment: each parent’s share of the basic obligation plus their share of the add-ons, with credit for amounts they pay directly. The parent who owes more than they pay directly is the obligor; the difference is the monthly transfer payment.
To answer it, add Line 7 plus the parent’s share of Lines 8–11, then subtract the amounts that parent already pays directly (such as the health premium they carry). The remaining balance is the transfer payment.
For example, David Lopez owes $1,325 (Line 7) plus $114 (his share of daycare) for a total of $1,439, minus $0 he pays directly, for a $1,439 transfer payment to Maria.
A nuance is when both parents pay directly for different expenses. The worksheet nets them out so only one transfer payment moves between households each month.
The most common mistake is forgetting the direct-pay credit. If you carry the health insurance, that premium credits against your transfer payment, and missing the credit costs you $100 to $400 per month.
A misconception is that the transfer payment is final. The court can deviate up or down based on Part VII and Part VIII factors.
Part VII: Additional Factors for Consideration
Part VII lists factors that may justify a deviation from the standard calculation, including residential schedule, children from other relationships, high-income cases, and shared expenses. The court is not required to deviate, but it may under RCW 26.19.075.
To answer it, check each box that applies and write a short narrative explaining the factor. Attach a separate page if you need more room.
For example, the Reed parents check “residential schedule” and write “Father has the children 50% of the overnights under the parenting plan filed 3/14/2025” with a citation to the parenting plan.
A nuance is the residential credit. A 50/50 schedule alone does not justify a deviation; you must show that the standard calculation creates a hardship or that both households are sufficient.
The most common mistake is checking boxes without explaining. The court ignores unsupported deviation requests and orders the standard calculation.
A misconception is that asking for a deviation is hostile. Deviations are routine and the worksheet specifically invites them.
Part VIII: Other Factors for Consideration
Part VIII is a catch-all for anything not covered in Part VII, such as extraordinary debt, a disabled child’s special needs, or a child’s independent income. Use it sparingly and document everything.
To answer it, write a clear factual statement and the dollar amount, if any, you ask the court to consider. Cite the supporting document and page.
For example, Janet Kim writes “Child Sofia receives $480/month in SSI for autism; see attached benefit letter” in Part VIII.
A nuance is that a child’s own SSI does not reduce a parent’s support obligation, but a child’s SSDI derivative benefit may.
The most common mistake is using Part VIII as a venting space about the other parent. The court ignores accusations that are not tied to a number.
A misconception is that Part VIII is optional decoration. It is the right place to flag anything unusual that the standard math misses.
Signature Block: Parent Signatures and Date
The signature block at the end requires each parent (or the parent who prepared the worksheet) to sign under penalty of perjury under the laws of the State of Washington. The judge also signs and dates the worksheet when entering the order.
To answer it, sign your full legal name in blue or black ink, print your name underneath, and date it in MM/DD/YYYY format. Leave the judge’s signature line blank.
For example, Maria Lopez signs Maria Lopez, prints Maria Lopez, and dates it 03/14/2026.
A nuance is e-signatures on eFileWA. The “/s/ Maria Lopez” format is accepted in most counties when the underlying PDF is filed electronically.
The most common mistake is filing an unsigned worksheet. Clerks reject unsigned worksheets at intake, and your hearing date may evaporate.
A misconception is that signing only commits you to the math, not the income figure. Signing under penalty of perjury commits you to every fact on the worksheet, and a knowingly false income line is a class C felony under RCW 9A.72.020.
Three Filled-Out Examples Using Real Scenarios
Scenario 1: Maria and David Lopez — Two W-2 Parents, Two Children, Daycare
| Form Section | What Maria Enters |
|---|---|
| Caption | KING County, Cause No. 25-3-04567-1 SEA, Petitioner Maria Lopez, Respondent David Lopez |
| Children | Sofia Lopez, 04/12/2017; Mateo Lopez, 09/03/2020 |
| Line 1 (Gross) | $4,820 (Maria) and $5,180 (David) per pay stubs |
| Line 2 (Deductions) | $1,000 (Maria FICA + tax + L&I) and $1,200 (David FICA + tax + union) |
| Line 3 (Net) | $3,820 (Maria) and $3,980 (David), combined Line 4 $7,800 |
| Line 5 (Share) | 0.4897 (Maria) and 0.5103 (David) |
| Line 6/7 (Basic) | Economic Table per-child $1,038 × 2 = $2,076; David’s share $1,059 |
| Line 8c (Daycare) | $650 monthly daycare; David’s share $332 |
| Line 12 (Transfer) | David pays $1,391/month to Maria |
| Signature | Maria Lopez, 03/14/2026 |
Scenario 2: Marcus Reed — Self-Employed Father, One Child, 50/50 Schedule
| Form Section | What Marcus Enters |
|---|---|
| Caption | PIERCE County, Cause No. 25-3-00987-2, Petitioner Jennifer Reed, Respondent Marcus Reed |
| Children | Liam Reed, 06/22/2019 |
| Line 1 (Gross) | $3,200 (Jennifer W-2) and $5,400 (Marcus Schedule C net + depreciation add-back) |
| Line 2 (Deductions) | $520 (Jennifer) and $1,240 (Marcus self-employment tax half + actual federal tax) |
| Line 3 (Net) | $2,680 (Jennifer) and $4,160 (Marcus), combined $6,840 |
| Line 5 (Share) | 0.3918 (Jennifer) and 0.6082 (Marcus) |
| Line 6/7 (Basic) | Per-child $978; Marcus’s share $595 |
| Part VII (Deviation) | Checks “residential schedule,” writes “50/50 overnights under parenting plan filed 1/10/2026; requesting downward deviation” |
| Line 12 (Transfer) | Marcus pays $397/month to Jennifer after deviation |
| Signature | Marcus Reed, 04/02/2026 |
Scenario 3: Aisha and Terrence Brown — High Income, Three Children, Special Needs
| Form Section | What Aisha Enters |
|---|---|
| Caption | SPOKANE County, Cause No. 26-3-00112-32, Petitioner Aisha Brown, Respondent Terrence Brown |
| Children | Jaylen Brown, 02/14/2012; Imani Brown, 11/30/2015; Kobe Brown, 07/05/2019 |
| Line 1 (Gross) | $8,500 (Aisha RN salary) and $11,000 (Terrence engineer salary) |
| Line 2 (Deductions) | $2,125 (Aisha) and $2,940 (Terrence) |
| Line 3 (Net) | $6,375 (Aisha) and $8,060 (Terrence), combined $14,435 (above advisory cap) |
| Line 5 (Share) | 0.4416 (Aisha) and 0.5584 (Terrence) |
| Line 6/7 (Basic) | Extrapolated per-child $1,310 × 3 = $3,930; Terrence’s share $2,194 |
| Line 8a (Health) | $310 child-only premium carried by Terrence (direct-pay credit) |
| Part VIII (Special) | Writes “Jaylen receives $480/mo SSI for autism; uninsured therapy averages $220/mo” |
| Line 12 (Transfer) | Terrence pays $2,084/month to Aisha after credits |
| Signature | Aisha Brown, 05/18/2026 |
How to File the Completed Form
The signed worksheet must be filed with the Superior Court clerk in the county where your case is pending, and it must be filed at the same time as (or before) any motion or final order that sets support. Filing channels vary slightly by county, but every Washington county accepts at least three of the channels below.
- eFileWA online portal. File through https://www.courts.wa.gov/efsc/ using your account, upload the signed PDF, pay the per-document e-filing fee (typically $0 for the worksheet itself when filed with an underlying motion, otherwise the standard motion fee), and download the file-stamped copy as your proof of filing. Processing is usually same-day.
- In person at the courthouse. Bring two copies of the signed worksheet plus the original to the county Superior Court clerk’s office. The clerk file-stamps the copies, returns one to you as proof, and keeps the original. There is no separate fee for filing the worksheet itself.
- By mail. Send the signed worksheet plus a self-addressed stamped envelope to the clerk’s mailing address listed on the county clerk directory. Processing takes 5–10 business days, and the file-stamped copy returned to you is your proof.
- By fax (a few rural counties only). Confirm acceptance with the clerk before sending. Keep the fax confirmation as interim proof until the file-stamped copy arrives by mail.
Pay any filing fees by credit card on the portal or by check made out to the county clerk for in-person and mailed filings. If you cannot afford the fees, file a Motion to Waive Filing Fees at the same time and the clerk will accept the worksheet without payment while the waiver is pending.
What Happens After You File
Once the worksheet is filed, the court reviews it as part of the underlying motion or final order. At an agreed entry, the judge signs the worksheet on the same day and the support amount becomes effective on the date of the order. At a contested hearing, the judge or commissioner reviews both parents’ worksheets, picks one (or builds a third), and signs that version.
The signed worksheet is then attached to the Order of Child Support (FL All Family 130) and becomes part of the support file. DCS uses the order to set up wage withholding, income reporting, and enforcement. The transfer payment usually starts the first day of the month after entry.
Either parent can ask to modify the worksheet later if income or expenses change, but only after 24 months unless one of the early-modification triggers in RCW 26.09.170 applies. Until a new worksheet is filed and approved, the original transfer payment stands and arrears accrue at 12 percent per year under RCW 4.56.110.
Mistakes to Avoid When Filling Out the Form
- Filing an outdated PDF: the Economic Table values change yearly, and an old form pulls old numbers, leading to an instantly wrong transfer payment.
- Using net pay instead of gross pay on Line 1: the calculation under-counts income by 20–30 percent and the order will be reversed on motion.
- Forgetting to add back depreciation for self-employed parents: this hides income, exposes you to a contempt finding, and can re-open the case.
- Deducting voluntary 401(k) contributions on Line 2: only mandatory deductions are allowed, and the court will recalculate on its own.
- Listing the children’s full insurance premium instead of the child-only portion: this inflates the add-on and the other parent will demand a refund.
- Reading the wrong age column on the Economic Table: the 12-and-older column is significantly higher, and the wrong column shorts the children.
- Rounding Line 5 to two decimals: the proportional share drift compounds across all add-ons.
- Skipping Part VII when seeking a deviation: the court ignores deviation requests that are not narrated.
- Filing an unsigned worksheet: clerks reject it at intake and you lose the hearing date.
- Mixing children from a prior relationship into the children block: the Economic Table column changes and overstates support.
Do’s and Don’ts
- Do use the Washington State Child Support Calculator, because it auto-pulls the current Economic Table and prevents lookup errors.
- Do file your Sealed Financial Source Documents under GR 22, because that protects your tax returns from public view.
- Do average irregular income over 24 months, because Washington courts expect smoothing for bonuses and seasonal work.
- Do keep the file-stamped copy of every worksheet for at least 7 years, because DCS may audit your account.
- Do update the worksheet whenever a child ages out of the under-12 tier, because the basic obligation shifts.
- Do check the calculator output line-by-line against your pay stubs before signing, because the calculator is only as good as the inputs.
- Don’t sign a worksheet you have not personally reviewed, because the signature block is under penalty of perjury.
- Don’t combine deductions on Line 2 to save space; itemize each one so the court can verify.
- Don’t estimate childcare; use the provider’s invoice or written statement.
- Don’t assume 50/50 residential time means no support; the income gap usually still drives a transfer payment.
- Don’t wait until the morning of the hearing to file the worksheet; clerks reject late filings.
- Don’t use a third-party PDF copied from a blog; only the AOC version is current.
Pros and Cons of Filing on Your Own vs. With Help
- Pro (self-file): Free or near-free, because the AOC form and the DCS calculator are no-cost.
- Pro (self-file): Faster turnaround, because you control the timing and can file the day you finish.
- Pro (self-file): Builds your understanding of the support number, which helps in future modifications.
- Pro (self-file): Court facilitators review your worksheet for free in most counties.
- Pro (self-file): Online calculators eliminate most math errors when used carefully.
- Con (self-file): Easy to miss depreciation add-backs, deviation arguments, or special expense add-ons.
- Con (self-file): Self-employed parents commonly under-report income and face later contempt motions.
- Con (self-file): No one is checking your math against the other parent’s worksheet.
- Con (self-file): Deviation requests in Part VII rarely succeed without a lawyer’s narrative.
- Con (self-file): A worksheet error becomes a long-term, year-after-year overpayment or underpayment.
FAQs
Do I have to file the WSCSS Worksheets if both parents agree on the amount?
Yes. Washington law requires the worksheets in every case where support is set, regardless of agreement, and the judge cannot enter the order without them under RCW 26.19.035.
Can I use last year’s WSCSS form if I already started it?
No. The Economic Table updates yearly, so an outdated form produces wrong numbers and the clerk will reject it.
Do I write my gross pay or my take-home pay on Line 1?
Yes, write gross pay before any deductions, because Line 2 is where the limited mandatory deductions come out.
Can I deduct my 401(k) contribution on Line 2?
No. Only mandatory deductions count, and voluntary retirement contributions are not mandatory under RCW 26.19.071(5).
Do I include my new spouse’s income on the worksheet?
No. A new spouse’s income is not part of gross monthly income, though it can be a Part VII deviation factor in some cases.
Should the child support amount include my full family health premium?
No. Only the child-only portion of the premium goes on Line 8a, calculated as the difference between family and employee-only coverage.
Do I list a child from a prior relationship in the children block?
No. Children from a prior relationship belong on Line 2c (other dependents), not in the main children block at the top of the worksheet.
Can I file the worksheet electronically through eFileWA?
Yes. Most Washington counties accept the signed PDF through eFileWA, and an “/s/ Name” e-signature is valid.
Do I need to attach my tax returns to the worksheet?
Yes, file them under the Sealed Financial Source Documents cover sheet so the court sees them but they stay out of the public file.
Can the court order more than the Economic Table amount when our income is above $12,000?
Yes. RCW 26.19.020 allows the court to extrapolate above the advisory cap based on the children’s needs and the parents’ standard of living.
Do I have to redo the worksheet if a child turns 12?
Yes. The basic obligation increases at age 12, and either parent can move to modify the support order to reflect the new amount.
Is the worksheet signature actually under penalty of perjury?
Yes. A knowingly false figure on the worksheet is a class C felony under RCW 9A.72.020, so review every line before signing.
Related reading
- How to Fill Out California Form FL-155 (w/Examples) + FAQs
- How to Fill Out California Form FL-191 (w/Examples) + FAQs
- How to Fill Out New York Form UD-11 (w/Examples) + FAQs
- How to Fill Out New York Form UD-8 (w/Examples) + FAQs
- How to Fill Out the Ohio Child Support Computation Worksheet + FAQs
- How to Fill Out Washington FL Modify 521 (w/Examples) + FAQs
- How to Fill Out California Form FL-120 (w/Examples) + FAQs