Estimating income for the Marketplace when you work for yourself

If you work for yourself, the hardest part of buying health insurance is not choosing a plan. It is filling in one box: your estimated household income for a year that has not happened yet. That number sets your premium tax credit, and it is reconciled against reality on your tax return.

It is net income, not what you invoice

The figure the Marketplace wants is modified adjusted gross income for your whole tax household. For self-employed people that starts with net business income after allowable expenses, not gross receipts.

This is the single most common error we correct. A photographer who invoices well and spends heavily on equipment, insurance and studio rent has a net income far below their invoiced total. Entering the invoiced total inflates MAGI, shrinks the credit, and means overpaying premium every month for a year in exchange for a refund much later.

What else belongs in the number

• A spouse's wages, if you file jointly.
• Any other income on the same return: interest, dividends, taxable retirement distributions, unemployment compensation.
• Income of any dependant who is required to file a return of their own.
• Not: child support received, most gifts, or the non-taxable portion of Social Security in most situations.

There is a second test that trips people up, and it has nothing to do with the number. If anyone in your tax household has an offer of employer coverage that is affordable under the federal test, the household generally cannot claim a premium tax credit. A spouse's new job in March can undo a subsidy claimed in January. We check that first, before anything else.

Building the estimate

1. Start with last year's actual net business income from your return.
2. Adjust for what you already know: a client gained or lost, a contract ending, a planned equipment purchase that will be deducted.
3. Add the rest of the household's income on the same return.
4. Write down the assumptions. In July you will want to know what you assumed in November.
5. Round conservatively rather than optimistically. Slightly over-estimating creates a refund; under-estimating creates a repayment.

The Marketplace expects estimates to change. It has a process for it. Using that process is normal, not an admission of error.

When the year goes differently

Report it. You can update your income estimate with the Marketplace at any point in the year, and your advance credit is adjusted forward from that point. A good quarter reported in July is a small monthly adjustment for the rest of the year. The same good quarter discovered at filing is a repayment, subject to caps that depend on your income.

We diarise a check for every self-employed client around July. It is a five-minute conversation: here is what you estimated, here is what has actually happened, does anything need updating. That is the whole intervention, and it is why our 1099 clients rarely get April surprises.

Choosing the tier once the number is right

Only once the income estimate is solid does the plan comparison mean anything, because the subsidy changes the relative price of every tier. Two things then matter.

First, cost-sharing reductions only exist on Silver plans. At qualifying incomes they can cut a Silver deductible substantially, which regularly makes Silver the better buy even when a Bronze plan looks cheaper on premium alone. Second, a Bronze plan paired with a genuinely funded health savings account is a real strategy, but only if you will actually fund it. An unfunded HSA is just a large deductible with a nicer name.

We model both against a light year and a heavy year. The gap between those two scenarios is usually what decides it, and it is a conversation that takes about twenty minutes and costs nothing.

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