Self-Employed in Texas: How to Estimate 1099 Income for a Marketplace Subsidy

Every open enrollment season I hear the same thing from self-employed Texans: "I feel completely lost. My income is never the same month to month, which makes estimating my annual income for the marketplace really stressful. If I guess too low I end up having to pay back subsidies at tax time, and if I guess too high I leave money on the table."

That tension is real. But there's a practical method for navigating it — and knowing what actually counts as income for subsidy purposes makes it a lot less scary.

Why estimating income is uniquely hard when you're 1099

When you're a W-2 employee, estimating your annual income is easy. It's basically your salary. When you're self-employed, every month is different. You might earn $8,000 in March and $1,500 in August. You might land a new client in October that changes your whole year. You don't know your annual total until you're close to year-end — and the marketplace needs an estimate in January (or whenever you enroll).

On top of that, what counts as "income" for subsidy purposes isn't your gross revenue. It's your Modified Adjusted Gross Income (MAGI) — a specific IRS calculation that has some levers you can pull to lower it legitimately.

What actually happens if you guess too LOW

If your actual income ends up higher than what you estimated, you received more in Advanced Premium Tax Credits (APTC) than you were entitled to. At tax time, the IRS reconciles this on Form 8962, and you'll owe back the difference — up to a repayment cap.

The repayment caps depend on your final income as a percentage of the Federal Poverty Level (FPL). At lower incomes, there's a limit on how much you can owe back. But if your income exceeds 400% FPL, you may have to repay the full excess amount — which can be several thousand dollars.

What happens if you guess too HIGH

If your actual income ends up lower than estimated, you received less subsidy than you were entitled to. The IRS reconciles this in your favor — you get the difference back as a refundable credit on your tax return. You overpaid your monthly premium, but you didn't lose money. You just gave the government an interest-free loan for a few months.

This is why guessing a bit high is generally the safer direction for self-employed people with variable income. The downside (overpaying monthly, getting a refund at tax time) is much more manageable than the upside risk of a large repayment bill.

A practical method: estimate conservatively, update mid-year

Here's the approach I walk clients through:

1. Start with last year's net self-employment income (Schedule C profit, not gross revenue). This is your baseline.
2. Adjust for known changes: Did you drop a major client? Start a new one? Have a planned slow period? Adjust up or down.
3. Guess slightly high rather than trying to nail it exactly. If you think you'll earn $48,000, put $52,000. The penalty for underestimating is much worse than the penalty for overestimating.
4. Update your estimate mid-year when you have a better read on how the year is tracking. HealthCare.gov lets you report income changes anytime, and your subsidy will adjust going forward.
5. Keep an eye on the FPL floor. In Texas, Medicaid is not expanded. If your income drops below 100% FPL (~$15,060 for a single person in 2026), you may fall into the coverage gap and lose subsidy eligibility without gaining Medicaid access. If you see your income trending that low, report it promptly and ask a licensed advisor what your options are.

Levers that lower your countable income (MAGI)

Your MAGI for subsidy purposes is not the same as your gross 1099 income. Several legitimate deductions reduce it:

• Business expenses (Schedule C): Deductible expenses reduce your net self-employment income, which flows into your MAGI. Track these carefully — this is often the biggest lever.
• SEP-IRA or Solo 401(k) contributions: Pre-tax contributions to a self-employed retirement account reduce your AGI dollar-for-dollar. A $10,000 SEP-IRA contribution can meaningfully lower your subsidy-eligible income.
• HSA contributions: If you're enrolled in a High Deductible Health Plan (HDHP), contributions to a Health Savings Account are also deductible above-the-line and reduce your MAGI.
• Self-employed health insurance deduction: See below — this one has a circular relationship with your subsidy that's worth understanding separately.

The self-employed health insurance deduction (Schedule 1)

If you're self-employed and pay for your own health insurance, you can deduct 100% of the premium from your gross income on Schedule 1, Line 17. This reduces your AGI and therefore your MAGI.

Here's the circular part that confuses people: your subsidy lowers your out-of-pocket premium cost. The deduction applies to what you actually pay out of pocket — not the full pre-subsidy premium. So the deduction is smaller when you have a larger subsidy. But here's the compounding benefit: the deduction lowers your MAGI, which may qualify you for a slightly larger subsidy, which in turn affects the deduction amount. The IRS has a specific calculation method for handling this loop (it's iterative), and most tax software handles it automatically.

The practical takeaway: the self-employed health insurance deduction makes your health coverage materially cheaper at tax time, on top of whatever subsidy you received during the year. Factor it into your planning.

Two scenarios worth knowing