ACA Subsidy Cliff Calculator for Self-Employed

Self-employed taxpayers can deduct 100% of health insurance premiums paid for themselves and their family as an above-the-line deduction on Schedule 1. But the deduction is limited to net profit from self-employment — and crucially, it cannot include any portion of the premium that was covered by your Premium Tax Credit.

This creates a circular problem:

1. Your MAGI determines your subsidy eligibility and credit amount.
2. Your PTC determines how much you actually paid out-of-pocket for insurance.
3. Your SE health insurance deduction is the premium you paid out-of-pocket.
4. That deduction reduces your MAGI — which changes your PTC.

Step 4 feeds back into step 1. There's no closed-form formula. The IRS Publication 974 describes an iterative Worksheet approach; this calculator implements that method automatically.

For most self-employed taxpayers earning in the 200–380% FPL range, the interaction saves $1,000–$4,000 per year compared to a naive calculation that ignores the loop. Near the 400% cliff, correctly modeling the deduction can mean the difference between qualifying for a substantial credit and getting nothing.

What this calculator does:

• Computes SE tax and the half-SE-tax deduction from your net SE income
• Iteratively solves the health insurance deduction / PTC dependency until both values are consistent (typically converges in under 15 iterations)
• Applies the 2026 applicable percentage table (reverting to original ACA rates after ARP expiration)
• Reports your final MAGI, PTC, net premium, and distance from the 400% cliff

During open enrollment (November–January): Before selecting your marketplace plan, use this calculator with your projected income to estimate your net premium and check your cliff position.

Before taking on a high-revenue contract: A single large client can push you over the 400% cliff. Model the impact before you sign.

When planning retirement contributions: Maxing out a SEP-IRA, Solo 401(k), or traditional IRA directly reduces MAGI. This calculator shows in real time how much margin each additional dollar of deduction buys you.

If your income fluctuates: Freelancers and consultants with variable revenue should run this at least quarterly. If your actual income will significantly exceed your advance credit enrollment income, you'll owe back the excess subsidy at tax time — potentially including a cliff repayment of the full credit amount.

When considering a spouse's W-2 job: A spouse taking a W-2 position adds household income. If it pushes you over 400% FPL, the loss of your health insurance subsidy may offset a significant portion of that salary.