ACA subsidies are paid in advance and reconciled at year end: don't report promptly and you pay it back next year

If one of you buys insurance yourself on the Marketplace (healthcare.gov), getting married directly affects subsidy eligibility. And the mechanism has a feature many people don't know about.

The subsidy is "given now, calculated at year end"

The ACA premium tax credit is paid in advance based on the income you estimated, applied directly against your premium each month, so you pay the reduced amount.

Then it's reconciled when you file the following year: your actual annual income is used to recompute what you were entitled to, and anything overpaid has to be returned.

So this isn't money the government gives you; it's closer to an advance.

What marriage changes

Your combined household income is recalculated.

Two incomes stacked together may exceed the subsidy eligibility threshold, turning what was a discount of a few hundred dollars a month into nothing at all.

And if you don't report promptly, the system keeps paying the subsidy on the old income. When it's reconciled at the next filing, all of that excess has to be repaid.

The amount can run into thousands of dollars, and it arrives after you've already spent the money.

So: update your income on the Marketplace right after the wedding

Not at the next open enrollment. now.

Marriage is itself a special enrollment event (60 days, see item 17 of the checklist), so while you're updating your income, you can also take the opportunity to reselect a plan and get both done at once.

Three possible outcomes after updating

1. The subsidy shrinksThe monthly premium will be higher, but at least you won't have to worry about paying back subsidies at the end of the year.
2. The subsidy goes to zeroAt this point, compare again: see whether it makes more sense to keep buying a Marketplace plan or join your spouse's employer plan (see item 63 of the checklist).
3. You qualify for something betterIf your spouse's income is very low, an increased household size actually widens the subsidy threshold.

On Medicaid

If you were on Medicaid, combined income may make you ineligibleIn this situation, move to the Marketplace or an employer plan as fast as possible with no gap in between, because American medical costs really don't tolerate a gap.

Conversely, a larger household with modest income can newly qualify. Medicaid expansion differs by state, so check your own state's rules.

When a foreign spouse has just arrived

If your spouse just got a green card and has no income yet, household income stays the same while household size grows, which is usually favorable for getting a subsidy. But report it all the same so the system calculates using the right numbers.

Also, some immigration statuses limit Marketplace eligibility, so a recent arrival should confirm which applies to them.

In one line

The subsidy is an advance, not a gift; update your income on the Marketplace right after the wedding, or you'll hand back the excess at next year's filing.

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