ACA / Marketplace plans

How to estimate my income for a Marketplace application

Reviewed by Howard Yeh, agency principal, Healthcare.com Insurance ServicesLast reviewed 2026-09-04

When you apply for Marketplace coverage, you are asked to estimate your household income for the year. The Marketplace uses this estimate to determine how much financial help you may receive. Getting it right matters: if you estimate too low, you may need to repay some or all of the extra credit at tax time. If you estimate too high, you could miss out on savings you were entitled to during the year.

At a glance

  • The Marketplace uses your estimated modified adjusted gross income (MAGI) for the coverage year, not last year's tax return alone.
  • Your estimate includes income for everyone in your tax household, not just the person applying.
  • You can (and should) update your estimate during the year if your income changes significantly.

What income the Marketplace uses

The Marketplace bases your financial help on modified adjusted gross income (MAGI). MAGI is your adjusted gross income (the number at the bottom of the first page of your tax return) plus three items that some people can exclude from AGI:

  • Untaxed foreign income
  • Non-taxable Social Security benefits
  • Tax-exempt interest

For most people, MAGI is the same as adjusted gross income. The Marketplace looks at your estimated MAGI for the current year, not your past tax return, though your most recent return is often a helpful starting point.

What counts as income

Your MAGI generally includes:

  • Wages and salary (before taxes and deductions)
  • Self-employment income (net profit after business expenses)
  • Unemployment compensation
  • Social Security benefits (including the non-taxable portion for MAGI purposes)
  • Investment income (interest, dividends, capital gains)
  • Retirement distributions (from 401(k), IRA, or pension)
  • Alimony received (for divorce agreements finalized before 2019)
  • Rental income
  • Farm income

If anyone else is in your tax household (a spouse you file jointly with, or your dependents), their income counts too.

What generally does not count

  • Child support received
  • Supplemental Security Income (SSI)
  • Workers' compensation
  • Gifts or inheritances
  • Proceeds from loans
  • Veterans' disability benefits

When in doubt about whether a specific income source counts, the IRS definition of MAGI for the premium tax credit (found in IRS Publication 974) is the authoritative source.

Household size definition

Your household size for the Marketplace is based on your tax filing:

  • You (the tax filer)
  • Your spouse, if you plan to file jointly
  • Your tax dependents, including children and qualifying relatives you claim

Everyone in this tax household has their income counted toward the total, and the household size determines which federal poverty level (FPL) bracket applies. A larger household has a higher income threshold for the same percentage of FPL.

Note: You do not need to be buying coverage for every household member. Even if a spouse or dependent has coverage elsewhere, they still count toward your household size and their income still counts toward your household total.

Why estimates matter

The Marketplace calculates your subsidy based on the income you project for the year. If you take the advance premium tax credit, that estimated amount is applied to your monthly premium right away. But the final amount is reconciled when you file your federal tax return using Form 8962.

  • If your actual income was higher than you estimated, you may have received too much in advance credits and could owe the difference back.
  • If your actual income was lower, you may receive an additional credit as part of your tax refund.

The closer your estimate is to your actual year-end income, the fewer surprises you will have at tax time.

How to estimate if your income varies

If you are self-employed, a gig worker, a freelancer, or anyone whose income fluctuates, estimating annual income can feel like guessing. A few approaches may help:

  • Start with last year's tax return as a baseline, then adjust for anything you know has changed (new clients, lost contracts, a raise, reduced hours).
  • Use a rolling average. If your income has been variable for several years, averaging the last two or three years may give a more realistic estimate than any single year.
  • Be conservative but honest. It is better to estimate slightly high than to significantly underestimate and face a large repayment. However, do not inflate your estimate so much that you miss financial help you are entitled to.
  • Track income throughout the year. Self-employed individuals especially should review their actual income quarterly and update their Marketplace application if the picture changes.

There is no penalty for estimating in good faith, even if your income ends up being different. The reconciliation process handles the difference.

When to update your estimate

You should report income changes to the Marketplace as soon as possible. This includes:

  • A new job or job loss
  • A significant raise or pay cut
  • Starting or ending self-employment
  • Receiving (or losing) unemployment benefits
  • A spouse starting or stopping work
  • Any event that significantly changes your household income

Updating promptly helps keep your advance credit close to the right amount, which reduces the chance of a large repayment or a large refund at tax time.

You can update your income estimate through HealthCare.gov or your state exchange at any time, not only during Open Enrollment.

What happens if your estimate is wrong

An incorrect estimate does not mean you lose coverage or face a penalty. The adjustment happens at tax time:

  • Underestimate: You may owe back some or all of the extra advance credit. Through tax year 2025, repayment caps limited how much many households owed, but starting with tax year 2026 those caps are eliminated and you generally repay the full excess.
  • Overestimate: You may receive a larger tax refund reflecting the credit you did not use during the year.
  • Income drops below 100% FPL: In most states, you may not be eligible for the premium tax credit at all for that year. If Medicaid is available in your state, you may qualify for that instead.

The important thing is to estimate in good faith and update the Marketplace when things change.

Tools and resources

  • HealthCare.gov income estimator: The Marketplace application itself walks you through the income estimation. You can also preview estimates before starting a full application.
  • IRS Publication 974: The detailed IRS guide to the premium tax credit, including the definition of MAGI.
  • Last year's tax return: Your most recent Form 1040, especially the adjusted gross income line, is the best starting point.
  • Pay stubs and 1099s: Use current-year documents to adjust from your prior-year baseline.

What to do next

Primary action: Start your Marketplace application on Healthcare.com to see how your estimated income affects your financial help. Alternative: Learn more about what happens to your premium tax credit at tax time so you know what to expect.

This article provides general educational information, not legal, tax, or financial advice. Plan availability, pricing, subsidies, and benefits depend on individual circumstances, location, and the current plan year, and may change.

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Open Enrollment for 2027 ACA coverage on HealthCare.gov runs November 1, 2026 through January 15, 2027. Enroll by December 15, 2026 for coverage starting January 1, 2027. Dates vary in states that run their own marketplace. To enroll in ACA coverage outside Open Enrollment, you must qualify for a Special Enrollment Period.

Eligibility for Affordable Care Act (ACA) premium tax credits and cost-sharing reductions is based on household income, household size, and plan availability in your area. The enhanced premium tax credits that were in effect from 2021 through 2025 expired on December 31, 2025. For plan year 2027, premium tax credits follow the standard rules under Internal Revenue Code §36B, which generally limit eligibility to households with income between 100% and 400% of the federal poverty level. Under these rules, eligible households are expected to contribute between 2.15% and 10.22% of household income toward the cost of a benchmark silver plan (IRS Rev. Proc. 2026-26). Premiums, plan availability, and subsidy amounts vary by income, household size, age, and location. Final eligibility and premium tax credit amounts are determined by the Health Insurance Marketplace. If your actual income differs from your estimate, you may have to repay some or all of any advance premium tax credit when you file your taxes. Federal legislation affecting premium tax credits may change these amounts.

*87% of Marketplace enrollees received a premium tax credit in 2026. Centers for Medicare & Medicaid Services, 2026. Health Insurance Exchanges 2026 Open Enrollment Report.

+Plan availability varies by location.

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