How to Estimate Your 1099 Income for ACA Subsidies (Without Lying)

Every July, I get the same call from self-employed clients across the Lowcountry. It goes something like this: “Michelle, I’m halfway through the year, my income is way off what I told Healthcare.gov in November, and I’m scared I’m going to owe a bunch of money back. Can you help?”

The answer is always yes. And the reason this conversation happens in July is not a coincidence. Your second-quarter estimated tax payment was due June 15, which forces every freelancer, consultant, Etsy seller, and subcontractor in South Carolina to actually look at their year-to-date numbers for the first time since April. When you look at those numbers, you start doing math on your ACA subsidy, and then you either panic or you call me.

This post is the math. I am going to walk you through how to estimate your 1099 income for Healthcare.gov the right way - not by guessing, not by lying about either direction, and not by copying last year’s number into a form you do not understand. If you get this right, you avoid the subsidy clawback at tax time. If you get it wrong, you either leave real money on the table or you owe thousands to the IRS next April.

Why Self-Employed Income Is Different (And Harder)

If you are a W-2 employee, projecting your annual income takes about six seconds. You look at your pay stub, multiply by the number of pay periods left, add what you already earned, and you are done. Self-employed income does not work that way.

When you signed up for a marketplace plan last fall, Healthcare.gov asked for your expected household modified adjusted gross income (MAGI) for 2026. If you are a freelancer, your MAGI is roughly your gross receipts minus your deductible business expenses, minus half of your self-employment tax, minus your self-employed health insurance deduction, plus any other taxable income (W-2 wages from a side job, spouse income, interest, capital gains, etc.). That is the number the subsidy is calculated against.

Here is what trips people up. The subsidy is based on the projection you made in November 2025 for the entire calendar year 2026. You are halfway through that year. Your income is almost certainly not going to land exactly where you thought it would. And when you file your taxes in April 2027, the IRS compares your actual 2026 MAGI to what you told Healthcare.gov. If you underestimated (meaning you made more money than you projected), you pay back some or all of your subsidy. If you overestimated, you get the difference back.

In a normal year, that clawback is annoying but survivable. In 2026, with the enhanced subsidies gone and average Lowcountry premiums up 98% over last year, a clawback can mean owing the IRS $6,000, $10,000, even $15,000. That is a mortgage payment. That is a new roof. That is real money.

The Honest Way to Project Your 2026 Income

Here is how I walk self-employed clients through the projection. It takes about 30 minutes with a calculator and your bank statements.

Step 1: Pull Your Year-to-Date Gross Receipts

Log into your bank, your Stripe dashboard, your Venmo business account, your PayPal, your Square, your Wave, your QuickBooks - whatever you actually use. Add up every dollar of business income you have received from January 1 through June 30. This is your year-to-date gross.

Do not subtract expenses yet. Do not subtract taxes. We want the gross number.

Step 2: Average Your Monthly Receipts and Project Forward

Divide your year-to-date gross by six. That gives you your average monthly gross receipts for the first half of 2026. Multiply that average by six again to project the second half of the year.

Now, here is where most people stop. Do not stop here. Your second half is probably not going to look like your first half. You need to adjust.

Ask yourself honest questions:

• Did I land a new contract in Q2 that is going to bump my revenue for the rest of the year?
• Did I lose a client in Q2 that is going to drop my revenue?
• Is my business seasonal? If I run a wedding photography business in Charleston, my Q3 and Q4 are going to be front-loaded with fall wedding season. If I run a tax prep business, my Q3 and Q4 are dead.
• Am I planning to take time off? Maternity leave, a wedding, a move, a surgery?

Adjust your second-half projection up or down based on what you actually know. Write down a number you are willing to defend to the IRS.

Step 3: Subtract Your Deductible Business Expenses

Now pull your expenses. Everything the IRS lets you deduct on Schedule C. Office rent, Zoom subscription, your Squarespace website, your mileage log for client visits, your laptop depreciation, your health insurance premiums (yes, as a self-employed deduction), your accountant, your BNI membership if you are in one, your business license with Dorchester County.

Be honest. Do not inflate. The IRS matches 1099-NEC and 1099-K forms against your return, and Healthcare.gov does not care about your hustle story - it cares about the numbers.

Subtract your annualized expenses from your annualized gross. That gives you your net self-employment income.

Step 4: Calculate Half of Self-Employment Tax

Self-employment tax is 15.3% on your net self-employment income (up to the Social Security wage base cap, which is $176,100 for 2026). You get to deduct half of that when calculating your MAGI. Take your net from step 3, multiply by 0.153, divide by 2. That is your “half of SE tax” deduction.

Step 5: Subtract Your Self-Employed Health Insurance Deduction

If you buy your own health insurance and you are profitable, you can deduct what you pay in premiums (the unsubsidized portion) as an adjustment to income. This is a big deal because it also reduces your MAGI, which can increase your subsidy in a circular way that tax software handles automatically.

For rough estimating, use what you pay out of pocket for premiums across the whole year, not what the subsidy covers.

Step 6: Add Any Other Household Income

If you have a spouse with W-2 income, add it. Interest income, dividend income, capital gains from that Roth conversion you did in February, any taxable IRA distributions - add all of it. Healthcare.gov wants household MAGI, not just your 1099 income.

If you have rental income, add the net. If you collected unemployment earlier in the year, add that too.

Step 7: Compare to What You Told Healthcare.gov in November

This is the moment of truth. Take your new projected 2026 MAGI and compare it to the number you entered on Healthcare.gov last fall.

If your new number is within about 10% of the old one, you are probably fine. You can leave it alone, or you can update Healthcare.gov to be safe. If your new number is more than 10% off in either direction, you need to update Healthcare.gov. Today.

What Happens When You Update Your Income on Healthcare.gov

Log into Healthcare.gov, go to your application, and click “Report a life change.” One of the options is “Change in expected income for the year.” Select it, enter your new projection, and Healthcare.gov recalculates your subsidy on the spot.

If you are getting more subsidy, your premium will drop starting the following month. If you are getting less subsidy, your premium will go up starting the following month. That is the trade-off, and it is the honest thing to do. The alternative is letting the old, wrong number ride through December and then owing the IRS a big check in April.

One thing people do not know: you can update your income on Healthcare.gov as many times as you want during the year. There is no penalty for updating it twice. You do not need to wait for a Special Enrollment Period. This is a reporting change, not a plan change.

The Three Ways People Get This Wrong

In my Summerville office, I have seen every version of this. Let me save you the heartburn.

Mistake 1: Lowball it to get a bigger subsidy. I had a client last year who underestimated her income by $20,000 because she wanted the cheapest premium. When she filed her taxes, she owed back $4,200 in subsidy. If your income is above 400% of the federal poverty level now that the enhanced subsidies are gone, the entire subsidy can be clawed back. There is no cap. The old $2,800 cap that used to protect low lowballs expired when the enhanced PTCs did. Lowballing is now genuinely dangerous.

Mistake 2: Use last year’s number because it is easier. I get it. Pulling bank statements is tedious. But if you had a banner 2025 and 2026 is slower, you are overpaying for insurance right now. If you had a slow 2025 and 2026 is better, you are setting yourself up for a clawback. Neither is good.

Mistake 3: Forget the 1095-A reconciliation exists. Some people think Healthcare.gov and the IRS do not talk. They absolutely do. You will get a Form 1095-A from Healthcare.gov in January 2027 showing what subsidy you received. That form goes on Form 8962 with your tax return, and the reconciliation happens automatically. You cannot hide from it.

A Realistic SC Example

Let me put numbers on this. Say you are a freelance graphic designer in Goose Creek. You projected $62,000 in MAGI last November. You picked a Silver plan from BlueCross BlueShield of South Carolina with a $210 monthly subsidy.

It is July. You pull your numbers and realize you actually landed two big contracts in Q2 and your projected 2026 MAGI is going to be closer to $88,000. At $88,000, as a single filer, you are above 400% of FPL for a household of one, which means with the enhanced subsidies gone, you get zero premium tax credit.

If you do nothing and let the $210/month subsidy ride through December, you will owe back approximately $2,520 in subsidy on your 2026 tax return. That is on top of the regular income tax you owe on the extra $26,000 you earned.

If you update Healthcare.gov in July, your premium jumps by $210 a month for the rest of the year (roughly $1,260 total). You pay it now instead of in April. Your cash flow takes a hit, but you avoid the $2,520 clawback and the late-April panic.

There is no good option. But updating is the honest one and usually the smaller hit.

When to Call Me

I am not a CPA. I do not file your taxes. What I do is help self-employed clients across South Carolina make this projection honestly, pick the right metal tier based on realistic income, and update Healthcare.gov mid-year when life changes.

If you are sitting in front of your bank statements right now, stressing about whether your income projection is right, call me at (843) 594-1759. We will walk through your numbers together, I will pull your current plan details, and we will either update Healthcare.gov or leave it alone based on what the math actually says. No sales pitch, no upsell, just 30 minutes of honest help.

Your income is yours. Your subsidy is the government’s. When you get them aligned correctly, you pay the right amount for the right coverage and you sleep through tax season. That is the goal.

I don’t stop until you’re covered.