When you apply for Marketplace coverage, one number does more work than any other: the household income you expect to earn next year. Your ACA income estimate decides whether you get a subsidy, how large it is, and whether you owe money back when you file taxes. Getting the ACA income estimate subsidy calculation right starts with an honest number. For 2027 coverage it matters more than it has in years, because the rules changed at the start of 2026. This guide walks through what counts as income, how to build an honest estimate, and what to do when the year does not go the way you planned.
Why the Estimate Matters So Much for 2027
The enhanced premium tax credits that many Floridians relied on expired at the end of 2025. Under current law, for 2027 coverage, subsidies are generally available to households with income between 100% and 400% of the federal poverty level. Above 400%, there is no subsidy at all.
That creates a hard edge. Under the enhanced rules, a household a little over the line still got some help. Today, a household that estimates just under 400% may qualify for a meaningful credit, while one that lands just over it qualifies for none. Congress has debated an extension, and as of this writing it has not passed. So the estimate you enter is not a formality. It can move your monthly premium a long way in either direction, and you should confirm your own numbers when you apply.
What Counts as Income on the Application
The Marketplace uses a figure called modified adjusted gross income. You do not need to memorize the definition, but it helps to know roughly what goes into it:
- Wages and salaries, after pre-tax payroll deductions such as workplace retirement contributions
- Net self-employment income, meaning what is left after business expenses
- Unemployment compensation
- Taxable interest, dividends and capital gains
- Taxable distributions from retirement accounts and pensions
- Social Security benefits, including the portion that is not taxed
- Rental income after expenses
Some things usually do not count, such as child support you receive, gifts, and supplemental security income. Contributions to a traditional IRA or a health savings account can lower the figure. If you are unsure about a particular source, write it down and ask, because guessing tends to go wrong in one direction or the other.
Who is in the household
Household size matters as much as dollars. Generally it means you, your spouse if you are married, and anyone you claim as a tax dependent. If you plan to marry, divorce or add a child in 2027, the household on your tax return may look different from the one living under your roof today, and that changes the math.
How to Build an Honest Estimate
Start with last year’s tax return. It is the best record you have of what your household actually earned. Then adjust it for what you know is coming.
- Salaried workers: take your current pay, add any raise you expect, and include bonuses only if they are reasonably likely.
- Self-employed and 1099 workers: look at the last two or three years of net profit, not gross receipts. If business is growing, say so in the estimate.
- Early retirees: plan your withdrawals. A large IRA distribution or a home sale with a gain can push income past the 400% line for that year.
- Seasonal and commission earners: use a realistic annual average rather than your best month or your worst.
Here is a common situation we see. A self-employed couple in Broward County, one a contractor and one a part-time bookkeeper, had a slow 2026 and wanted to estimate low. But two new contracts were already signed for spring. Their honest estimate included that work, and it landed them in a different place than the slow year would have. Building it carefully up front was far less painful than repaying credits the following April.
What Happens When Your Real Income Is Different
Premium tax credits are an advance on a credit you settle when you file your federal tax return. The Marketplace pays part of your premium each month based on your estimate, and then the IRS compares that with what you actually earned.
- If you earned less than you estimated, you may get the difference back as a larger refund.
- If you earned more, you may have to pay back some or all of the extra credit you received.
- If your actual income ends up above 400% of the poverty level under current law, you may have to repay the advance credit you received for the year.
Reconciliation is the reason a careful estimate matters. A low guess feels good every month and stings at tax time.
Report Changes During the Year
Your estimate does not have to be perfect, but it should stay current. If you take a new job, lose one, land a big client or start drawing on retirement savings, update your application on HealthCare.gov, which Florida uses. The Marketplace will recalculate your credit going forward, and the adjustment is spread across the remaining months.
Some households choose to take less than the full advance credit each month as a cushion, then collect any remainder at tax time. That is a reasonable option if your income is hard to predict. It means a higher monthly premium in exchange for less risk of a repayment.
Timing for 2027 Coverage
Open Enrollment for 2027 coverage runs from November 1, 2026 to January 15, 2027. Enroll by December 15 for coverage that starts January 1; enrolling from December 16 to January 15 means coverage starts February 1. If you already have a Marketplace plan and do nothing, it renews automatically, and it renews using information that may be out of date. Updating your income during Open Enrollment is the simplest way to start the year with the right credit. You can read more about how we help with applications on our ACA Marketplace page.
Frequently Asked Questions
What income does the Marketplace use to calculate my subsidy?
It uses your household’s modified adjusted gross income for the coverage year. That generally includes wages, net self-employment income, taxable retirement distributions, investment income and all Social Security benefits. Your estimate is for 2027, not the year that just ended.
Who can get an ACA subsidy for 2027?
Under current law, premium tax credits for 2027 are generally available to households between 100% and 400% of the federal poverty level. Above 400% there is no subsidy. Congress has debated an extension, so confirm the rules and your numbers when you apply.
What if I underestimate my income?
You may have to pay back some or all of the extra credit when you file your federal tax return. If your actual income ends up above 400% of the poverty level, you may have to repay the advance credit you received for the year.
Should I update my income if it changes mid-year?
Yes. Reporting changes on HealthCare.gov lets the Marketplace adjust your credit for the remaining months, which reduces the gap you would otherwise settle at tax time.
Can a broker help me estimate my income?
A licensed broker can walk through your income sources and household size with you and help you enter them correctly. For tax questions specific to your situation, a tax professional is the right person to confirm the details.
Get Your Estimate Right With a Second Set of Eyes
If you want help putting together a realistic ACA income estimate for 2027, call Maher Insurance Group at (855) 238-7947. You can also fill out our short online questionnaire, and a licensed agent will follow up at a time that suits you.
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