How to Fill Out Mississippi Withholding Form 89-350 + FAQs

Mississippi Withholding Form 89-350 is the state’s Employee’s Withholding Exemption Certificate, and every employee who earns wages in Mississippi must complete it so the employer withholds the correct amount of state income tax from each paycheck. You fill it out by entering your personal information, selecting your marital or filing status, claiming your personal and dependent exemptions, adding any extra withholding, signing the form, and handing it to your employer, who then keeps it on file and uses it to calculate withholding under the Mississippi Department of Revenue withholding rules.

The problem that Form 89-350 addresses is simple but costly when ignored. Mississippi law under Miss. Code Ann. § 27-7-308 requires every employer to withhold state income tax from employee wages, and the amount withheld depends on the exemptions the employee claims on Form 89-350. When the form is missing, wrong, or outdated, the employer must withhold at the highest rate with zero exemptions, which shrinks take-home pay and can create a surprise tax bill or refund at year end.

According to the Mississippi Department of Revenue’s annual report, withholding tax is the single largest source of individual income tax collections in the state, accounting for more than 85% of the roughly 2.1 billion dollars in individual income tax revenue collected each fiscal year. That scale shows why getting this one-page form right matters for workers, employers, and the state budget alike.

Here is what you will learn in this guide:

• 📝 How to complete every line of Form 89-350 without errors or guesswork
• 💰 How Mississippi’s 2026 flat tax rate affects the exemptions you should claim
• 👨‍👩‍👧 How marriage, dependents, and age 65 or blindness change your exemption math
• ⚖️ How the governing statutes and penalties protect or punish you
• 🚨 How to avoid the seven most common mistakes that trigger under-withholding

What Form 89-350 Is and Why It Exists

Form 89-350, officially titled the Mississippi Employee’s Withholding Exemption Certificate, is the state equivalent of the federal Form W-4. The form tells your employer how much Mississippi income tax to take out of each paycheck based on your personal exemptions, dependents, and any extra amount you want withheld. Without a completed 89-350 on file, the employer defaults to the single-with-zero-exemptions rate, which almost always over-withholds for families and under-withholds for workers with side income.

The governing authority comes from Miss. Code Ann. § 27-7-308, which requires every Mississippi employer to deduct and withhold income tax from wages. The companion statute, Miss. Code Ann. § 27-7-309, sets the exemption amounts that flow directly onto the lines of Form 89-350. The Mississippi Department of Revenue then publishes the official withholding tables in Publication 89-700, which employers use to translate the numbers on your 89-350 into paycheck withholding.

The consequence of skipping the form is immediate. The employer must withhold at the maximum rate with no exemptions, which under Mississippi’s 2026 flat 4% tax on income above 10,000 dollars can cost a married worker with two children hundreds of extra dollars each month in unneeded withholding. That money eventually comes back as a refund, but only after a full tax year passes.

A common misconception is that the federal W-4 does double duty for Mississippi. It does not. Mississippi requires its own separate certificate, and relying on the W-4 alone violates the employer’s duty under Mississippi Administrative Code Title 35 and exposes both the worker and the employer to reconciliation problems.

Who Must File the Form

Every new hire in Mississippi must complete Form 89-350 on or before the first day of work, and every existing employee must file a new form within ten days whenever their exemption status changes. A marriage, divorce, birth of a child, death of a dependent, or a spouse taking a second job all trigger the ten-day rule under the Mississippi withholding regulations. Failing to update the form does not just misalign withholding; it can shift liability for under-withheld tax onto the employee at filing time.

Nonresidents who perform services in Mississippi also file the form, but they claim only the exemptions allowed for the portion of income earned inside the state. Military spouses protected under the federal Military Spouses Residency Relief Act may claim exemption from Mississippi withholding if they meet the residency test, and they mark that status on the form itself.

How the Form Interacts With Federal Withholding

The federal W-4 and Mississippi 89-350 live in parallel but follow different math. The W-4 since 2020 uses a dollar-amount system with no allowances, while Mississippi still uses an exemption-dollar system tied to filing status and dependents. That means a worker can be perfectly dialed in federally and still be wildly off for Mississippi if the 89-350 is missing or outdated.

The practical workaround for most workers is to treat the two forms as a paired set during onboarding. A payroll manager at a Jackson manufacturing plant, for example, should hand both forms to every new hire on day one and walk through the exemption lines on the 89-350 separately from the federal deductions worksheet. This avoids the trap of copying W-4 numbers onto the 89-350, which produces incorrect state withholding almost every time.

Line-by-Line Instructions for Form 89-350

Form 89-350 fits on a single page, but each line carries a distinct legal meaning. The top block collects identifying information, the middle block collects exemption claims, and the bottom block collects signatures and certifications. You fill the form using blue or black ink, or you type it electronically through your employer’s onboarding portal.

The form is divided into numbered lines running from 1 through 6, followed by the employee signature and an employer verification block. Each line maps to a specific subsection of Miss. Code Ann. § 27-7-21, which defines personal exemptions, and to § 27-7-309, which governs withholding exemptions. Errors on any single line roll forward into every paycheck until the form is corrected.

Top Block: Identifying Information

The top of the form asks for your full legal name, Social Security number, home address, and the employer’s name and address. You use the name that appears on your Social Security card, because the Mississippi Department of Revenue matches the 89-350 against W-2 filings at year end through the Department of Revenue’s TAP portal. A mismatch can delay refunds or trigger an identity review.

Consider Maria Lopez, a new hire at a Tupelo call center. She recently married and took her spouse’s last name on her driver’s license but has not yet updated her Social Security card. On Form 89-350 she writes her old last name to match the Social Security record, then files a new 89-350 after the Social Security update clears. That small sequencing step prevents a W-2 rejection at year end.

Line 1: Single Filing Status

Line 1 is for employees filing as single. You check the box and enter 6,000 dollars, which is the single personal exemption allowed under Miss. Code Ann. § 27-7-21. The plain-English meaning is that Mississippi will not tax the first 6,000 dollars of your wage income if you file single.

The consequence of skipping this line when you truly are single is over-withholding, because the employer will default to zero exemptions. A common misconception is that single workers with no dependents should leave Line 1 blank to be safe; that choice actually costs them paycheck cash all year. Jordan Pate, a single warehouse worker in Olive Branch, claims the 6,000 on Line 1 and sees roughly 20 dollars more per biweekly check than a coworker who left the line blank.

Line 2: Married Filing Status

Line 2 handles married employees and splits into two sub-choices. A married employee whose spouse is not employed enters 12,000 dollars, the full joint exemption. A married employee whose spouse is employed splits the 12,000 dollars between the two spouses in any combination they choose, as long as the total across both 89-350 forms does not exceed 12,000 dollars.

The reasoning is that Mississippi treats married couples as a single tax unit under § 27-7-21, and the 12,000 dollar exemption belongs to the household, not to each worker. If both spouses claim the full 12,000 separately, the household will be under-withheld by roughly 480 dollars at the 4% flat rate, and the shortfall appears as a tax-due balance in April.

A real-world example involves David and Ellen Carter, a dual-earner couple in Hattiesburg. David earns 70% of household wages, so they allocate 9,000 dollars to his 89-350 and 3,000 dollars to Ellen’s. That split matches their income ratio and keeps withholding close to their actual liability.

Line 3: Head of Family

Line 3 is for unmarried employees who maintain a home for a qualifying dependent. The exemption is 9,500 dollars under Mississippi’s head-of-family rules, which track the federal head-of-household concept but with different dollar amounts. You must actually pay more than half the cost of keeping up the home and have a qualifying relative living with you for more than half the year.

The consequence of claiming head of family when you do not qualify is under-withholding and a potential 10% negligence penalty under Miss. Code Ann. § 27-7-345. A common misconception is that any single parent automatically qualifies. Cohabiting with another adult who shares household costs equally can disqualify the claim, even when a child lives in the home.

Line 4: Dependents

Line 4 is where you list the number of dependents other than yourself and your spouse. Each dependent is worth 1,500 dollars of additional exemption, and you must be able to claim the person as a dependent on your Mississippi income tax return. Children, qualifying relatives, and in some cases aging parents all count.

The reasoning is that Mississippi’s exemption system mirrors the federal dependency tests found in IRC § 152, but applies the Mississippi dollar amount. If you claim a dependent you cannot actually claim on the Mississippi return, the under-withheld tax becomes due with interest at the rate set in § 27-7-345. A real-world example involves Priya Ramanathan, a nurse in Gulfport, who claims her two children plus her mother who lives with her year-round and depends on Priya for more than half her support; Priya writes 3 on Line 4 and adds 4,500 dollars to her total exemption.

Line 5: Age 65 or Blindness

Line 5 gives additional exemptions for employees who are age 65 or older or who are legally blind, and for spouses who meet either test. Each qualifying condition adds 1,500 dollars to the exemption total, and a single taxpayer who is both 65 and blind stacks two 1,500 dollar amounts for a 3,000 dollar add-on.

The consequence of overlooking Line 5 is straightforward over-withholding for older workers, which is common among retirees who return to part-time work. Robert Jennings, a 67-year-old part-time driver in Meridian, claims the age-65 exemption on Line 5 and adds 1,500 dollars to his exemption base, reducing his state withholding by 60 dollars a year at the 4% rate.

Line 6: Additional Dollar Amount Withheld

Line 6 allows you to request an extra flat dollar amount of Mississippi tax withheld from every paycheck. This line is useful for workers with side income, rental income, or capital gains that are not subject to withholding, because it lets you pre-pay Mississippi tax on that outside income through payroll.

A common misconception is that Line 6 is a percentage. It is a flat dollar amount per pay period, so a worker who wants 1,200 dollars of extra state tax withheld across 24 semi-monthly paychecks writes 50 on Line 6. Sofia Delgado, a freelance web developer in Oxford who also holds a W-2 job, uses Line 6 to cover the Mississippi tax on her freelance income and avoids quarterly estimated payments entirely.

Signature and Employer Block

The bottom of the form requires the employee signature, the date, and the employer’s name and address. The signature is a legal certification under penalty of perjury that the claimed exemptions are accurate. The employer does not sign the form but keeps it on file for at least four years under the Mississippi DOR recordkeeping rules and presents it on request during a withholding audit.

Three Common Scenarios on Form 89-350

The scenarios below show how real household situations translate into line entries on Form 89-350. Each row pairs a realistic choice with the direct consequence, so you can see how one checkbox or one number changes your paycheck for the entire year.

Scenario 1: Single Worker, One Job, No Dependents

Employee Choice	Paycheck Consequence
Checks Line 1 and writes 6,000	Correct withholding; roughly 240 dollars stays in pocket across the year versus zero exemptions
Leaves Line 1 blank	Employer withholds at zero-exemption rate; worker over-pays by about 240 dollars and waits until refund time to recover it
Adds 25 dollars on Line 6	Extra 600 dollars withheld across 24 pay periods to cover a side-gig tax liability
Signs and dates the form	Form becomes legally effective on the next pay cycle under § 27-7-308

Scenario 2: Married Couple, Both Spouses Work

Couple’s Choice	Household Consequence
Each spouse claims full 12,000 on Line 2	Household under-withheld by roughly 480 dollars; tax-due balance in April plus possible underpayment interest
Higher earner claims 9,000, lower earner claims 3,000	Withholding matches actual liability; no surprise bill and no large refund
Both spouses leave Line 2 blank	Both paychecks hit at single-zero rate; household loses about 960 dollars of cash flow for the year
One spouse adds 50 dollars on Line 6	Extra withholding buffers bonus or investment income without quarterly estimates

Scenario 3: Head of Family With Two Children

Employee Choice	Paycheck Consequence
Checks Line 3 for 9,500 and writes 2 on Line 4 for 3,000	Total 12,500 exemption; withholding closely tracks year-end liability
Checks Line 3 but leaves Line 4 blank	Loses 3,000 dollars of dependent exemption; over-withholds by about 120 dollars per year
Claims Line 3 without qualifying	Under-withheld; 10% negligence penalty possible under § 27-7-345
Updates the form within 10 days of a new birth	Withholding adjusts mid-year and avoids a refund cliff

Three Named Examples That Show the Form in Action

The examples below walk through real-feeling fact patterns so you can see how the lines, statutes, and paycheck math fit together in daily life.

Example 1: Aisha Williams, New Graduate in Starkville

Aisha just graduated from Mississippi State and took her first job at a Starkville engineering firm earning 58,000 dollars. She is single, rents an apartment, and has no dependents. On Form 89-350 she checks Line 1, writes 6,000 in the exemption box, skips Lines 2 through 5, and leaves Line 6 blank because she has no outside income. Her employer runs her wages through Publication 89-700 and withholds Mississippi tax on the 52,000 dollars above the exemption at the 2026 flat 4% rate, which produces about 2,080 dollars of state tax spread across her pay periods.

Example 2: Marcus and Tanya Johnson, Dual Earners in Southaven

Marcus earns 85,000 dollars at a logistics company and Tanya earns 45,000 dollars at a school district. Because the 12,000 dollar married exemption is a household total, they split it by income ratio: Marcus claims 7,800 on Line 2 and Tanya claims 4,200. Marcus also adds 40 dollars on Line 6 to cover the Mississippi tax on a rental property they own in Horn Lake. Their combined withholding lands within 150 dollars of their actual liability, which matches the Mississippi DOR guidance on balanced withholding.

Example 3: Linda Beaumont, Retired Teacher Returning Part-Time

Linda is 68, legally blind, and takes a part-time librarian job in Biloxi earning 22,000 dollars. She is single. On Form 89-350 she checks Line 1 for 6,000 dollars, then claims two add-ons on Line 5: 1,500 dollars for age 65 and 1,500 dollars for blindness. Her total exemption is 9,000 dollars, and her employer withholds Mississippi tax only on the 13,000 dollars above the exemption.

Mistakes to Avoid on Form 89-350

Employees trip over the same set of errors every year, and each one carries a direct dollar cost. The list below catches the seven mistakes that generate the most corrections and the most under-withholding notices from the Mississippi Department of Revenue.

• Leaving the form blank and assuming the federal W-4 covers Mississippi; the employer must default to single-zero and over-withhold every paycheck.
• Both spouses claiming the full 12,000 dollar married exemption on separate forms; the household ends up under-withheld and faces an April tax bill plus possible underpayment interest under § 27-7-345.
• Claiming head-of-family on Line 3 without meeting the more-than-half-the-cost test; the 10% negligence penalty can apply when the return is filed.
• Listing dependents on Line 4 who are also claimed by an ex-spouse under a custody agreement; only one parent can claim the child, and the second claim gets reversed on audit.
• Forgetting Line 5 age-65 or blindness add-ons; older workers silently over-withhold for years without noticing.
• Writing a percentage on Line 6 instead of a flat dollar amount; payroll systems reject or misread the entry, and no extra tax is withheld.
• Failing to file a new form within ten days of a marriage, divorce, or new child; the old exemption numbers keep flowing, and the worker faces either a shortfall or an unnecessary refund loan to the state.

Penalties, Interest, and Employer Duties

Mississippi enforces withholding compliance through both the employer and the employee. Under Miss. Code Ann. § 27-7-345, an employer who fails to withhold or remit becomes personally liable for the unpaid tax plus interest at the rate set by the Commissioner, which is 0.5% per month in 2026. A 10% negligence penalty applies on top of the tax when the failure results from careless exemption certificates that the employer should have questioned.

Employees face their own exposure. A worker who knowingly overstates exemptions on Form 89-350 to reduce withholding can be assessed a 100 dollar penalty under the Mississippi withholding regulations and can lose the right to self-certify exemptions, in which case the employer must withhold at single-zero until the Department of Revenue lifts the restriction. The Department’s TAP portal also allows the Department to issue a lock-in letter to the employer that overrides any future 89-350 the worker submits.

Employers must keep each Form 89-350 for at least four years, and they must produce the forms on request during a withholding audit. A common misconception is that digital copies are not acceptable. The Mississippi DOR accepts electronic 89-350s stored in a payroll system as long as the signature is captured and the record is retrievable in readable form.

Interaction With Mississippi’s 2026 Flat Tax

Mississippi moved to a flat 4% individual income tax in 2023 under House Bill 531, and the 2025 Legislature accelerated further reductions toward 3% by 2030 through House Bill 1733. For 2026 the rate is 4% on taxable income above 10,000 dollars, with the first 10,000 dollars taxed at zero. The exemption dollars on Form 89-350 stack on top of that 10,000 dollar zero-rate bracket, so a single worker with a 6,000 dollar Line 1 exemption pays no Mississippi income tax on the first 16,000 dollars of wages.

The practical consequence is that the 89-350 has gained importance even as the rate has fallen, because the exemption lines now control a larger share of the total tax calculation. A worker who leaves the form blank in 2026 loses proportionally more than the same worker would have lost under the pre-2023 graduated rates.

Do’s and Don’ts

The list below captures the rules that keep Form 89-350 accurate, legal, and paycheck-friendly. Each item is paired with the reason behind it so you can apply the principle to edge cases the list does not spell out.

• Do file a new 89-350 within ten days of any life change because the statute requires it and the penalty for delay falls on the employee.
• Do coordinate the married exemption split with your spouse because the 12,000 dollar cap is household-wide and double-claiming triggers under-withholding.
• Do use Line 6 for side-income tax because flat extra withholding is simpler than quarterly estimated payments for most wage earners.
• Do keep a copy of every 89-350 you sign because disputes over exemptions start with the form the employer has on file.
• Do match the name on the form to the Social Security record because W-2 mismatches delay refunds and can trigger identity review.
• Don’t copy federal W-4 numbers onto the 89-350 because the two systems use different math and the copy almost always produces wrong state withholding.
• Don’t claim exempt status unless you had zero Mississippi tax liability last year and expect zero this year, because a wrong exempt claim is the fastest route to a lock-in letter.
• Don’t leave Line 5 blank if you are 65 or blind because the add-ons are not automatic and the employer cannot guess.
• Don’t sign a blank form and let payroll fill it in later because your signature is a perjury certification over whatever numbers appear.
• Don’t rely on a paper form if your employer uses an electronic portal because the portal version is the controlling record.

Pros and Cons of Claiming Maximum Exemptions

Workers often ask whether to claim every exemption they legally can or to under-claim on purpose to force a bigger refund. The honest answer is that each approach has trade-offs, and the right choice depends on cash-flow needs and discipline with lump sums.

• Pro: Maximum legal exemptions keep cash in your paycheck every two weeks, which beats giving the state an interest-free loan.
• Pro: Accurate exemptions reduce the risk of a lock-in letter because your withholding tracks your actual liability.
• Pro: Pairing Line 6 with correct exemptions lets you fine-tune withholding to the dollar without changing the exemption lines.
• Pro: Fewer April surprises means less reliance on tax-refund advances, which often carry high effective interest rates.
• Pro: Matching exemptions to real life keeps the form defensible in an audit and protects you from the 10% negligence penalty.
• Con: A larger paycheck requires discipline because outside income still owes tax, and spending the extra cash leaves you short in April.
• Con: Over-claiming by mistake can trigger a lock-in letter, which strips your ability to self-certify future exemptions.
• Con: Lining up the married split requires coordination with your spouse, and dual-earner couples who do not communicate often get it wrong.
• Con: Under-claiming on purpose to create a refund feels good in April but costs real paycheck money every pay period.
• Con: Frequent life changes mean frequent form updates, which some workers find tedious even though the statute requires them.

How Employers Process Form 89-350

Once you submit the form, the employer enters the exemption amount into the payroll system, which pulls the matching withholding figure from the state tables in Publication 89-700. The payroll system then deducts that amount from each check and remits it to the Mississippi Department of Revenue on the schedule assigned to the employer, usually monthly through the TAP online filing system. At year end the employer issues a W-2 showing total Mississippi wages and total Mississippi tax withheld, and those numbers must match the cumulative 89-350 activity.

Employers who discover an obviously wrong 89-350, such as a single worker claiming 25 dependents, have a duty to question it and in some cases to withhold at single-zero until the issue is resolved. The Mississippi DOR withholding guidance treats the employer as the first line of defense against abusive exemption claims. A payroll manager who ignores a facially wrong form can share liability for the under-withheld tax.

Special Rules for Nonresidents and Remote Workers

Nonresidents who perform services in Mississippi file the 89-350 and claim only the exemptions attributable to Mississippi-source income. A sales representative who lives in Memphis and works three days a week in Mississippi, for example, files an 89-350 covering only the Mississippi workdays. Remote workers who live outside Mississippi but work for a Mississippi employer generally do not file the form, because their wages are sourced to their state of residence under the Mississippi sourcing rules.

Military spouses who qualify under the federal Military Spouses Residency Relief Act check the exempt block on the 89-350 and attach proof of the service member’s non-Mississippi domicile. The employer then withholds zero Mississippi tax, and the spouse files any needed return in the home state.

Recent Guidance and Rulings

The Mississippi Department of Revenue refreshed its withholding guidance alongside the 2023 flat-tax transition and again after the 2025 acceleration, and the current version sits inside the Withholding Tax section of the DOR website. The 2026 guidance confirms that Form 89-350 remains the controlling certificate and that exemption amounts have not changed even though the rate has dropped.

In the 2022 Mississippi Supreme Court decision Mississippi Department of Revenue v. AT&T Corp., the court reinforced that withholding obligations are strictly construed against the employer and that documentary compliance, including proper 89-350 forms, is a required element of any defense against a withholding assessment. The practical lesson for employees is that the form matters as physical evidence, not just as a payroll input, and it should be signed, dated, and kept on file without shortcuts.

FAQs

Do I have to file a Mississippi Form 89-350 if I already filed a federal W-4?

Yes. Mississippi requires its own certificate under Miss. Code Ann. § 27-7-308, and the federal W-4 does not replace it. Without 89-350, the employer must withhold at single-zero.

Can both spouses claim the full 12,000 dollar married exemption?

No. The 12,000 dollar exemption is a household total under § 27-7-21. Spouses must split it between their two 89-350 forms, and the combined claim cannot exceed 12,000 dollars.

Is head of family the same as federal head of household?

No. Mississippi head of family tracks the federal test but uses a 9,500 dollar exemption and applies Mississippi-specific dependency rules under § 27-7-21. The two statuses usually align but not always.

Can I claim exempt on Form 89-350?

Yes. You may claim exempt only if you had zero Mississippi tax liability last year and expect zero this year. A wrong exempt claim can trigger a DOR lock-in letter.

Do I need a new 89-350 every year?

No. The form stays on file until your exemption status changes. A marriage, divorce, new child, or move out of state requires a new form within ten days.

Does Line 6 accept a percentage?

No. Line 6 accepts only a flat dollar amount to withhold each pay period. Payroll systems cannot process a percentage on that line.

Can I change my 89-350 mid-year?

Yes. Employees may file a new 89-350 at any time, and employers must apply the new numbers by the next regular pay cycle. Mid-year changes are common after life events.

Do remote workers outside Mississippi file Form 89-350?

No. Remote workers who live in another state and never physically work in Mississippi generally do not file the form. Their wages are sourced to their state of residence.

Can my employer refuse my 89-350?

Yes. An employer who sees a facially unreasonable claim, such as 25 dependents for a single worker, can question the form and withhold at single-zero until the issue is resolved.

Do I file Form 89-350 with the Mississippi Department of Revenue?

No. You give the form to your employer, who keeps it on file for at least four years. The DOR only receives the form if it asks for it during a withholding audit.

Does the 2026 flat tax rate change how I fill out the form?

No. The exemption lines and dollar amounts on Form 89-350 are unchanged. Only the underlying rate applied by the employer has dropped to a flat 4% above 10,000 dollars.

What happens if I never submit the form at all?

No exemptions apply. The employer must withhold at the single-zero rate under § 27-7-308, which usually produces over-withholding and a large refund the following April.