How to Fill Out FTB Form 3853 (w/Examples) + FAQs

California’s FTB Form 3853 is the state tax form you use to report health coverage for yourself and your household, claim any health-care exemptions, or calculate the Individual Shared Responsibility Penalty if you lacked Minimum Essential Coverage (MEC) during the tax year. Nearly 1 in 5 California taxpayers must interact with this form because California maintains its own health coverage mandate (unlike the now-repealed federal mandate) – skipping it can trigger hefty penalties.

🏥 Coverage Mandate: California residents (and dependents) must have qualifying health insurance (MEC) every month, or qualify for an exemption, or owe a penalty. Form 3853 is how you document that.
📄 Form Purpose: On Form 3853 you list your applicable household members, enter codes for months with coverage (code Z) or no coverage (code X) or any exemptions (codes A, B, C, etc.), then calculate the penalty (if any).
🔎 Key Steps: Identify all household members (even those with brief coverage), find Covered California Exemption Certificate Numbers (ECNs) if you earned them, fill out Parts I–IV as instructed, and attach 3853 to your California Form 540/540NR return.
💻 Fed vs CA: There is no federal penalty after 2018, but California’s individual mandate (effective tax years 2020 and later) can charge up to $900 per adult ($450 per child) or 2.5% of income over the filing threshold. Federal forms like 1095-A/8962 or 1095-B are used for ACA subsidies and coverage proof, but Form 3853 is the California-only requirement for reporting exemptions or penalties.
📆 Filing Notes: Download Form 3853 and its instructions from the FTB website (ftb.ca.gov) or through tax software. You only file 3853 if you cannot check the “full-year coverage” box on your CA return; otherwise you simply check the box on Form 540 and skip 3853.

🚫 Avoid CA’s Health Mandate Penalty: Fill Out FTB Form 3853 Now!

Filling out Form 3853 correctly will save you from a surprise tax bill. In this guide we’ll explain exactly how the form works (including California vs federal rules), break down each section of the form, define important terms, and even walk through realistic examples to show you how to enter the codes and numbers.

What Is Form FTB 3853 and Why Does It Matter?

Form 3853 is California’s Health Coverage Exemptions and Individual Shared Responsibility Penalty form. In plain terms, this means:

Purpose: It documents whether you or members of your household had the required health insurance (MEC) each month, or if you have a valid exemption. It then calculates any penalty owed for months without coverage.
State Mandate: Under California law (starting 2020), every resident (and dependents) must have qualifying health coverage (MEC) or qualify for an exemption. This is similar to the old federal ACA individual mandate, but it’s enforced by California’s Franchise Tax Board (FTB) after the federal penalty was eliminated.
Penalty: If you lack MEC without an exemption for any month, you owe a “Shared Responsibility Penalty.” For 2024 tax year, the penalty is the greater of (a) $900 per adult ($450 per child) in your household or (b) 2.5% of income above the filing threshold, subject to a cap tied to a bronze health plan premium. Form 3853 helps compute this amount.
Exemptions: Form 3853 also lets you claim exemptions so you avoid paying the penalty. Many situations qualify: low income, short coverage gaps, hardship, living abroad, membership in tribes or health sharing ministries, etc. Each exemption has a code (A through N) which you enter on the form by month.

Form 3853 matters because failing to accurately report coverage or exemptions can result in owing taxes plus interest, or missing a rightful exemption. Both taxpayers and tax professionals need to get this right for California returns.

Who Needs to File Form 3853 (CA vs Federal Mandates)

Not every California taxpayer files Form 3853. You file Form 3853 and report health coverage only if all of the following are true:

You are filing a California tax return (Form 540, 540NR, or 540 2EZ).
AND you cannot check the “Full-Year Health Coverage” box on that return (meaning at least one household member was uninsured or only had a partial-year exemption).
AND you are not someone who can be claimed as a dependent on another return (dependents don’t file their own 3853).
If any household member lacked MEC and has no exemption, a penalty will apply. Form 3853 is how you report all of this.

If everyone in your household had qualifying coverage for all 12 months, you simply check the full-year coverage box on your Form 540/540NR (Lines 76 or 75 respectively) and you do not need to file 3853 at all. In other words, complete coverage means no form and no penalty.

Federal vs California Requirements

A key distinction: Federal tax law currently has no individual mandate penalty (after 2018). However, California reinstated a state mandate starting in 2020. So even if you owe nothing federally, you might owe CA. Federal forms like IRS Form 8962 or IRS Form 1095-A are not submitted to California on this form – though some information overlaps. Form 3853 is entirely about California’s rules:

IRS Form 1095-A: Issued by the health insurance Marketplace (Covered California) for federal premium tax credits. For California, the Covered CA subsidy is now smaller, but the form 1095-A (and its California counterpart FTB Form 3895) helps confirm you had Marketplace coverage. However, 3853 cares whether you had MEC, not whether you got subsidies.
IRS Form 1095-B/1095-C: Show health coverage from an employer or government (these may be filed with the state via FTB Pub 3895B/C but are not directly part of 3853). They simply prove coverage (code Z for MEC on 3853).
IRS Form 8962: Federal reconciliation of premium tax credit. Not used on Form 3853, but if you got large premium subsidies, it can affect your California exemptions (because “coverage unaffordable” is based on household income).
Federal penalties: Repealed, so irrelevant here. California’s penalty calculations (explained in Part IV below) mirror the old federal formulas but with CA thresholds.

Key Definitions and Concepts

Before filling the form, understand these key terms:

Applicable Household / Responsible Individual: On Form 3853, the “applicable household” usually includes you (the taxpayer filing the return), your spouse (or registered domestic partner), and any dependents you claim. One of you is the “responsible individual” who reports the household (usually the spouse filing the return). You list all members of this household in Part I.
Minimum Essential Coverage (MEC): Qualifying health insurance that fulfills the mandate. Examples include employer plans, Marketplace plans, Medicare Part A/C, Medi-Cal, most Medicaid, TriCare, student plans, etc. If you had MEC in a month, you use code Z for that person-month on 3853 to show no penalty.
Exemptions: Situations that excuse you from the coverage requirement. California code letters A–N correspond to different exemptions (see chart above Part III of the form). For example:
- A (Unaffordable Coverage): If the cheapest health plan available would cost more than 7.97% of your household income (slightly under federal 8% rule), you can claim code A for those months.
- B (Aggregate Employer Coverage): A California-specific rule if multiple family members’ combined self-only employer plans were unaffordable.
- C (Short Gap): Up to 3 consecutive months without coverage is exempt (code C).
- D (Abroad/Nonresident): If you are a U.S. citizen abroad for 330+ days, or a nonresident for some months, etc.
- E (CA Nonresident): If you were bona fide out-of-state for a month (e.g. college student in another state) or similar.
- F (Health Sharing Ministry), G (Tribal member), H (Incarceration), I (Born/adopted mid-year), J (Died mid-year), K (CoveredCA hardship), L (Religious), M (Projected Income affordability via Marketplace), N (Limited-scope Medi-Cal).
  Each exemption code is entered in Part III of the form for the applicable months. If you have a Marketplace exemption granted by Covered California, you must enter that ECN (Exemption Cert. Number) in Part I next to the person’s name.
Modified Adjusted Gross Income (MAGI): Used for some calculations (like the 7.97% test). On Form 3853, MAGI is basically your federal AGI plus certain tax-exempt interest and foreign income (so it matches how federal premium credits are calculated).
Shared Responsibility Penalty: The amount you owe if coverage/exemptions were not in place. California calculates it like the old ACA federal penalty: the greater of (A) a flat dollar amount (900/adult, 450/child in 2024) or (B) 2.5% of household income above filing threshold, but then capped by the “State Average Bronze Plan Premium.” Form 3853 Part IV walks you through computing this.
Covered California (Marketplace): California’s state health insurance exchange. If you purchased insurance here and got subsidies, you would have received IRS Form 1095-A and see those details when completing 3853. Also, Covered California can grant certain exemptions (codes K, L, M) and will give you an ECN to enter.

Understanding these terms and related federal forms helps you navigate the details on Form 3853.

Where to Find Form 3853

FTB Form 3853 and its instructions are available on the California Franchise Tax Board website (ftb.ca.gov) under Forms & Publications for the relevant year. It is a two-sided form with an instruction booklet.

If you use tax software (like TurboTax, TaxSlayer, etc.), the program will generate and fill Form 3853 for you when you answer the health coverage questions. Note that some tax software may only add Form 3853 to your return after you indicate someone was uninsured or had an exemption. If you’re using a professional tax program, the form should auto-populate from your inputs.

If you’re filing by hand, download the PDF of FTB 3853 for the correct tax year (e.g., 2024). The form is titled “Health Coverage Exemptions and Individual Shared Responsibility Penalty.” Attach it to your Form 540 or 540NR. Do not send it separately to the FTB – it goes inside your tax return packet.

Always use the form for the tax year you’re filing. For example, when you file taxes in 2025, you use the 2024 version of Form 3853 to report coverage during calendar year 2024.

How to Fill Out Form 3853: Section by Section

Form 3853 is divided into Parts I, II, III, and IV (plus a short top section for identifying information). We’ll break down each part.

Identification (Top of Form)

Write your name(s) and SSN/ITIN exactly as on your California return. If filing jointly, list both names. This identifies the responsible individual (you or your spouse/RDP).

Part I – Applicable Household Members

In Part I you list everyone in your “applicable household.” This includes:

Yourself (the taxpayer).
Your spouse or registered domestic partner (if filing jointly).
Any dependents you are entitled to claim on your California tax return.

Even if someone had coverage or an exemption, they still go in this list. For each person, provide:

First name, last name, initial, date of birth (mm/dd/yyyy), SSN or ITIN.
If someone had a Marketplace exemption in 2024, also enter their Exemption Certificate Number (ECN) in the ECN column for that person. Covered California issues an ECN if an exemption was granted (e.g., affordability hardship, religious, etc.).

Example: You file jointly with spouse and have one child. In Part I you would write:

1. John D. Doe – 01/01/1980 – SSN: xxx-xx-xxxx – (any ECNs for John, if he had any)  
2. Jane D. Doe – 02/02/1982 – SSN: xxx-xx-xxxx – (ECN if applicable)  
3. Jessie D. Doe – 03/03/2010 – SSN: xxx-xx-xxxx – (ECN if applicable)

If someone has no ECN (because they didn’t get a Marketplace exemption), leave the ECN fields blank for that person.

Part II – Household Exemption (Income Below Filing Threshold)

Part II is a simple checkbox: “Check here if your applicable household income or gross income is less than your filing threshold.” This is a catch-all exemption for very low income.

If your household’s income was below California’s minimum filing requirement, check this box. (For example, for 2024, the filing threshold for a single person under 65 is around $16,000 of gross income).
If checked, you and your entire household are exempt from the penalty because your income is too low to file taxes anyway.
If not below threshold, leave it blank.

Even if your income is above the threshold, you may still have other exemptions in Part III.

Note: If you check this box, it covers the entire household – no need to code individual months in Part III (because none are subject to penalty). However, ensure Part I still lists all names for reference.

Part III – Coverage and Exemptions (Month-by-Month)

Part III is the core of the form. It’s a grid for each person/month. For each person listed in Part I, you enter codes for each month (January through December) OR in the “Full-Year” column if something applies all year.

Each person has a row (1, 2, etc. matching Part I). The columns are:

Full-year (column a): If a code applies for all 12 months, put the letter in column (a) and leave the month columns (b–m) blank.
Jan, Feb, … Dec (columns b–m): If coverage/exemption varies month to month, put the code in each month where it applies. Leave months blank if column (a) was used, or blank if no applicable code (should not happen – you must enter something each month if column a is blank).

The codes are:

Z = Had minimum essential coverage (MEC) that month. Use this if the person had qualifying health insurance (employer, government, individual, etc).
X = No coverage, no exemption (should not occur unless you will calculate a penalty for that month). If any month is code X (and no exemption covers it), that person owes a penalty for that month.
A = Unaffordable coverage exemption (for months where coverage was unaffordable, as defined by >7.97% of income).
B = Aggregate self-only coverage unaffordable (special case with multiple employees).
C = Short gap (3 months or less of no coverage).
D = Abroad or not lawfully present.
E = CA nonresident/part-year resident for that month.
F = Health care sharing ministry member.
G = Member of federally recognized tribe.
H = Incarcerated.
I = Born/adopted during year (and only before added).
J = Died during year (and only after).
K = General hardship (granted by Covered CA).
L = Religious exemption (Covered CA).
M = Marketplace projected income unaffordability (Covered CA).
N = Limited Medi-Cal or share-of-cost (per DHCS).

(Note: Not all letters A–N will be relevant to most filers. The instructions have a detailed chart.)

How to mark codes:

If every month of 2024 is covered or exempted the same way for a person, just enter the code in column (a). For example, if someone had MEC all year, put Z in (a) and ignore columns (b–m).
If coverage/exemption changes during the year, leave (a) blank and put the code in each month it applies. For example, if someone had coverage Jan–Apr (code Z) and no coverage in May–Aug but with a short gap exemption (code C), then: column (b)–(e): Z, column (f)–(i): C, columns (j)–(m) blank.
No code entered: If you truly had no coverage and no exemption for a month, enter X for that month. Each X month will generate a penalty in Part IV unless covered by a different code.

Important: Do not leave any month blank except when column (a) is used. Every person in every month must have either a coverage code or an exemption code or X.

Part IV – Individual Shared Responsibility Penalty

Part IV is for calculating the actual penalty (if any) you owe. You will:

Follow the steps in the instructions to find your Applicable Household Income (essentially your MAGI plus dependents’ income, minus the California filing threshold).
Compute 2.5% of the excess income over threshold (this is the “percentage” calculation).
Compute the flat dollar method: $900 for each adult (18+) and $450 for each child in the household. There is a limit (the max flat amount is $2,700 in 2024, equal to $900×3 since the cap is 3 or more people).
Compare the flat amount vs the percentage amount. Whichever is larger is your base penalty (this parallels federal rules).
Subtract the “State Average Bronze Plan Premium”. For 2024, this is $348 per person per month (or $4,176/year per person). For example, a 3-person household would have $12,528 credit (3×$4,176). You enter the smaller of your base penalty (line 3) or that bronze premium cap (line 4) on line 5 – that becomes the final penalty.

In practice, the worksheet will do this: you end up with Line 1 as your final Individual Shared Responsibility Penalty, which then goes on your Form 540 (Line 92) or 540NR (Line 91). If line 1 is zero or negative (like if all X months were covered by exemptions), then you owe no penalty.

One Form Per Household: Only one Form 3853 is filed for the entire applicable household – usually attached to the return of the “responsible individual” (typically the oldest spouse filing the tax return). Do not file separate 3853 for each person.

Related Forms and How They Connect

Although 3853 is specific to CA, it interacts with other tax forms:

1095-A (Marketplace Statement): If you bought coverage through Covered California (the state’s ACA exchange), you receive a federal 1095-A and a state FTB Form 3895 (California Health Insurance Marketplace Statement). These show the premiums you paid and any subsidies (premium tax credits) you received. For Form 3853, 1095-A/3895 are proof of MEC for those months (code Z) and are needed for calculating affordability.
8962 (Premium Tax Credit): Federal Form 8962 reconciles advance premium credits. It doesn’t feed directly into Form 3853, but its outcome (your final federal PTC) can indirectly affect whether coverage is considered affordable.
1095-B/1095-C (Carrier/Employer Coverage Forms): These federal forms report employer or other MEC coverage. For California, insurers send copies to FTB. You don’t send these on 3853, but you can use them to know which months had employer coverage. If someone’s employer plan covered them, put Z for those months.
FTB 3803 (Child/Dep Health Insurance Credit): Separate CA credit for kids’ coverage; doesn’t affect 3853 directly. Mention only because in Part IV instructions, it may adjust household income calculations.
FTB 3849 (Premium Assistance Subsidy, PAS): This was a CA subsidy form for 2020-2021 (now ended). You won’t use it for 2024, but if reviewing prior years, know that California had its own small ACA subsidy which ended in 2021.
FTB 3895 (California Marketplace): Basically CA’s version of Form 1095-A. You might see references to it. It’s informational.

Summary of Connection: In short, Form 3853 is mostly standalone for CA. Your federal return shows your 1095-A, 8962, etc., and that determines whether you owed any federal credit. For CA, we only care about who had MEC and which exemptions apply. The household income and members on your federal return (Form 1040) also feed into 3853 (for MAGI and dependents), but 3853 itself is a California calculation.

How to Fill Out Each Part of Form 3853

Part I – Applicable Household Members (continued detail)

Check ECNs Carefully: If Covered California granted any exemptions, they give you an Exemption Certificate Number for the person. You must enter the ECN in Part I next to that person’s name. If you fail to enter an ECN for a Marketplace exemption, that exemption is not claimed and will default to no coverage.
Dependents: For any dependent (child, elderly parent, etc.) that you claim, list them here too, with their SSN and birthdate.
Missing SSNs: If someone in your household doesn’t have an SSN (e.g. you have an ITIN), use their ITIN or apply for one. Form 3853 requires SSN/ITIN for each person listed.

Part II – Income Below Threshold

If checked, part III codes are not needed; all months are considered covered by this exemption. The instructions tell you to stop and file 3853 with just Part II checked if income is below threshold. In that case, your penalty is zero by definition.
If not checked, proceed to Part III.

Part III – Coverage and Exemptions Codes

We recommend listing codes person by person:

Full-Year Coverage (Code Z in column a): If the person had MEC all 12 months (for example, employer health or full-year Medi-Cal), put Z in the Full-Year column. Nothing else needed for that person.
Full-Year Exemption (Code X in column a): If the person had no coverage and no exemption all year, put X in column (a) (this is rare – normally you’d owe a penalty instead, but the form allows X as “no coverage/no exemption”). If someone is truly uncovered all year, don’t skip monthly entries – mark X full-year and you will pay maximum penalty for that person.
Mixed Months: If coverage/exemption status changed during the year, do month by month. Leave column (a) blank, then for each month Jan–Dec fill in the code. For example:
- If Jan–Mar covered by Medi-Cal, put Z in b–d; if Apr–Jun no coverage but covered by short-gap exemption, put C in e–g; if Jul–Dec covered by an employer, put Z in h–m.
- If a child was born in May, the months Jan–Apr no longer count as “in household.” The instructions say to only include months “after birth.” So you’d put I in May if claiming the birth exemption (though typically you’d just start listing the child from May on).
Exemption Specifics: Some exemptions only apply if certain conditions are met. For example:
- Code A (Unaffordable): You only enter A if you’ve determined via the affordability worksheet that the cheapest coverage cost >7.97% of income. Enter A for each month unaffordable.
- Code C (3-month gap): If a person had a continuous coverage gap of 1–3 months, you can mark C for those gap months.
- Code D (Abroad): Only use D for months where a US citizen was out of the country for 330+ days or a bona fide foreign resident, etc.
- Dependent “Born” or “Died”: For a person born or adopted midyear, mark I for the first month they existed. For someone who died midyear, mark J for the months after death.
No Coverage/No Exemption (Code X): If someone truly has no code for a month, fill in X for that month. This flags the penalty. For example, if you had no coverage in July and no exemption, July would get X.

Always double-check: every month of each person needs some entry. One common error is skipping codes for some months. If column (a) isn’t used, you must enter something for every month (b–m) – Z, X, or an exemption code.

Part IV – Calculating the Penalty (Worksheet)

After coding Part III, follow Part IV steps:

Determine Household Size: The instructions give rules. For Part IV, you count the number of people in your applicable household who lacked MEC without exemption. (Each adult = 1, each child (under 18) = 0.5 for flat amount purposes).
Flat Amount (Steps 2, Worksheet): Multiply $900 by the number of adults (18+) and $450 by minors, sum them. If 5 or more people, cap the flat at 5 individuals ($900×5=$4,500).
Applicable Household Income: Follow the instructions (like a mini tax software algorithm) to compute your “applicable household income.” This starts with your CA MAGI (federal AGI plus tax-exempt interest, etc.), adds any dependent incomes (if dependents required to file), adds any tax-exempt interest, and includes any reported credits. This is basically your annual household income for computing the percentage test.
Excess Income: Subtract the filing threshold for your household from that income. If the result is zero or negative, you don’t owe a percentage-based penalty (and likely should have checked Part II if very low).
Percentage Penalty: Take 2.5% of the excess income (rounding as directed). This is your percentage-based annual penalty amount.
Average Bronze Premium (CA Adjustment): Multiply $348 (2024 monthly CA average Bronze plan premium) by 12 for each person (or by the number from Worksheet A if part-year). This yields the annual “premium amount” used to cap the penalty.
Final Penalty: On the Individual Shared Responsibility Penalty Worksheet (in the instructions or Part IV), you take the larger of (flat or percentage), then cap it at the bronze premium total. The result goes on 3853 Line 1 and then on Form 540.

If the computed penalty is $0, that means your coverage/exemptions fully cover the year. Even if the result is zero, you still file 3853 (unless you had full-year coverage) to document why penalty is zero.

Example Penalty Calculation (simplified): Family of 4 (2 adults, 2 children), $100,000 income, no coverage at all.

Flat: $900×2 + $450×2 = $2,700.
Excess income (assume threshold ~$34k for family of 4) = $66k ×2.5% = $1,650.
Larger = $2,700.
Bronze cap: $348×12×4 = $16,704.
Penalty = the smaller of $2,700 and $16,704, so $2,700 goes on Line 1.

Avoiding Mistakes

Filing Form 3853 can be tricky. Avoid these common errors:

Incomplete Household List: Don’t forget anyone in Part I. If you skip a dependent or spouse, your penalty will be too low (because everyone uninsured wasn’t counted) and the FTB could audit you.
Missing ECNs: If Covered California approved an exemption, you must enter the Exemption Certificate Number. Failing to enter an ECN means you’re not claiming that exemption.
Wrong Codes: Use the correct codes for each month. For example, don’t enter Z (covered) if someone had only Medi-Cal for some months and a gap for others – use Z for the covered months and whatever code for gaps. Conversely, don’t leave months blank – each month needs a code.
Not Using the Affordability Worksheet: If you’re claiming code A (unaffordable coverage), follow the instructions or Covered California’s Affordability Worksheet to justify it. Forgetting to do that will likely trigger an audit or denial.
Threshold Slip-Up: Remember that if your income is below threshold, you could check Part II. If you earn too little to file CA taxes anyway, check that box! Forgetting it means you’ll compute an unnecessary penalty.
Incorrect MAGI or Dependents’ Income: Double-check your applicable household income. Exclude incomes of dependents if they don’t have to file, and include any tax-exempt interest (like municipal bond interest).
Thinking Federal = State: Don’t rely on IRS forms. Just because you got a 1095-A doesn’t automatically exempt you from CA penalty. You must manually enter on 3853 the coverage or exemption.
Skipping the Form: You must attach 3853 if you couldn’t check “full-year coverage” on your 540. Even if you think the penalty is $0, file the form to document your months of MEC or exemption.

Staying organized and reading the FTB instructions carefully will help avoid these pitfalls.

Examples of Filling Out FTB Form 3853

Below are realistic scenarios showing how to complete Form 3853. Each example is in a two-column table: one column describes the scenario, the other highlights how you would enter information on Form 3853.

Scenario (Household Details)	Key FTB 3853 Entries (by Part)
Example 1: Single adult (John) – John lived in California all year. He was uninsured for all 12 months. His MAGI was above the filing threshold.	Part I: List John as the only person (with SSN and birthdate). Part II: Do not check (income was above threshold). Part III: No coverage each month, so enter code X in column (a) or months Jan–Dec (either is full-year “X”). Part IV: Flat penalty: $900 (one adult). Percentage: 2.5% of (income – threshold). Suppose 2.5% yields $1,200 (higher than $900). Use $1,200. State bronze cap: $4,176 (one person). Penalty is smaller of $1,200 and $4,176, so $1,200. That goes on Line 1 and Form 540.
Example 2: Married couple with 2 children – Spouses Lisa & Mark, two kids. All had Medi-Cal (MEC) Jan–Sep. No coverage Oct–Dec (3-month gap) for all 4. Income is above threshold.	Part I: List Lisa, Mark, Kid1, Kid2 (with SSNs). Part II: No (income too high). Part III: For each person: Enter Z under Jan–Sep (covered by Medi-Cal). For Oct–Dec: since gap is 3 months (≤3), enter C (short gap exemption) for Oct–Dec. (You could put C in Oct and leave Nov-Dec blank or put C in each gap month depending on form layout instructions.) No X’s needed (exempt). Part IV: Because each gap was ≤3 months, the penalty is $0 for each person (the “short gap” exemption applies). So Line 1 = $0. They attach 3853 to claim exemption C, but owe no penalty.
Example 3: Single parent (Maria) with 2 kids – Maria’s household of 3. They had no coverage all year. Maria’s income is above threshold, and all health plans were unaffordable (>7.97%).	Part I: List Maria and both kids. Part II: No. Part III: For Maria and each child, column (a) blank. Because coverage is unaffordable year-round, you can use code A in column (a) for “full-year unaffordable.” (Or put A in all months Jan–Dec). No X’s (the unaffordable exemption applies every month). Part IV: With code A, everyone is exempt, so penalty = $0. 3853 is filed to document code A. If instead only some months had affordable options, you’d put X for months uninsured without exemption, but in this scenario no penalty applies.

These examples illustrate how you pick codes for coverage (Z) versus exemptions (C, A, etc.) and then compute the penalty (Part IV). Your exact numbers will vary, but the method is the same.

Pros and Cons of Coverage vs. Penalty

Having Minimum Essential Coverage (MEC)	Lacking Coverage (Owing Penalty)
✅ Complies with California law (no shared-responsibility penalty)	❌ Owes up to $900/adult ($450/child) or 2.5% of income
✅ Qualifies for health tax credits (1095-A, Form 8962) and subsidies	❌ Forfeits ACA premium tax credits; plus risk of medical bills
✅ Simpler taxes (just check full-year box, no Form 3853)	❌ Must file Form 3853, find and enter exemption codes, and pay extra tax
✅ Peace of mind with coverage and access to care	❌ Added complexity and cost of insurance vs. paying penalties

Maintaining MEC is strongly encouraged: it avoids penalties, uses tax credits, and is generally more beneficial than paying fines.

Common Mistakes to Avoid

Not Filing When Required: Don’t skip 3853 just because you think “no coverage, no box.” If you can’t check full-year coverage, you must file 3853. Tax software often forces this form if needed.
Leaving Months Blank: Every month must have a code if column (a) isn’t used. Forgetting to enter any code for a month is an error.
Wrong Exemption Code: Using, say, Z (covered) when you actually had an exemption, or vice versa. For instance, a family health-sharing ministry should be code F, not Z or X.
Mis-estimating Income: Using the wrong household income in calculations. Remember to use CA MAGI (federal AGI plus certain interest) as per instructions.
Forgetting Dependents: A newborn or newly adopted child must be listed starting the month they join. For a dependent who left or died, ensure you switch codes (I or J) appropriately.
Ignoring Software Prompts: If your tax software asks about health coverage or exemptions, answer carefully. Tools can sometimes skip sections if you say “I had coverage all year,” even if you didn’t. Double-check that Form 3853 is generated.

Staying organized (keep all 1095s, subsidy letters, etc.) and double-checking the code chart will help avoid these errors.

FAQs (Frequently Asked Questions)

Q: Who must file Form 3853? A: If you file a California return and cannot check the “full-year coverage” box on your 540/540NR (meaning someone in your household lacked MEC and isn’t fully exempt), you must file 3853. Only one 3853 per household goes with the return.
Q: Where can I get Form 3853? A: Download it (with instructions) from ftb.ca.gov under Forms for the tax year. If you use tax software, it should generate the form when you report coverage gaps or exemptions.
Q: How do I claim a Covered CA exemption certificate (ECN)? A: Covered California will mail you an ECN if they approve your exemption. Enter that ECN in Part I next to the person’s name. In Part III, use the corresponding code (e.g. K, L, or M) for the months it applies.
Q: What if I was uninsured only for 1–3 months? A: California allows a short gap exemption (code C). If your gap was three months or less, you can mark C for those months and owe no penalty for them. You still must file 3853, but the penalty will be reduced to zero for that gap.
Q: Does federal IRS Form 8962 feed into Form 3853? A: No. 8962 is for federal premium tax credits. California does not use 8962 results on 3853. However, 8962’s calculation can affect whether coverage is “unaffordable,” which is relevant for claiming code A on 3853.
Q: If I have Medi-Cal or employer coverage part-year, do I still file? A: Yes. You’d enter Z for the months with MEC and codes or exemptions for any months without. For example, if you had Medi-Cal Jan–Jun and no coverage Jul–Dec, you would list Z in Jan–Jun and X (or an exemption code if one applies) in Jul–Dec, then calculate any penalty.
Q: What if my income is below the filing threshold? A: Check the box in Part II. That means your whole household is exempt. You may still attach 3853 (with Part II checked) to document it, but the penalty will be zero.

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