TL;DR
- Roth conversions are counted as income for Modified Adjusted Gross Income (MAGI). Every dollar converted pushes you closer to, or past, the ACA subsidy cliff.
- For a 2-person household in 2026, the 400% FPL threshold is roughly $81,760. Go $1 over and you could lose $12,000-$20,000+ in annual premium subsidies.
- The optimal strategy balances tax bracket filling against subsidy preservation, and the math is different for every household size.
The Data: 2026 ACA Subsidy Thresholds by Household Size
ACA premium tax credits are available to households with MAGI between 100% and 400% of the Federal Poverty Level (FPL). Here are the 2026 numbers:
| Household Size | 100% FPL | 150% FPL | 250% FPL | 400% FPL (Subsidy Cliff) |
|---|---|---|---|---|
| 1 person | $15,060 | $22,590 | $37,650 | $60,240 |
| 2 people | $20,440 | $30,660 | $51,100 | $81,760 |
| 3 people | $25,820 | $38,730 | $64,550 | $103,280 |
| 4 people | $31,200 | $46,800 | $78,000 | $124,800 |
⚠️ Check current law: The enhanced subsidies from the Inflation Reduction Act (IRA) eliminated the cliff for plan years 2021-2025 and replaced it with a cap of 8.5% of income. These enhanced subsidies may or may not be extended. Verify the current subsidy structure when planning your conversion amount for any specific year.
What This Data Means: The MAGI-to-Subsidy Pipeline
Modified Adjusted Gross Income (MAGI) for ACA purposes includes virtually all income that appears on your tax return. For early retirees, the biggest contributors are typically Roth conversions, capital gains from brokerage sales, any part-time earnings, interest and dividend income, and rental income.
Here's the pipeline for a typical early retiree couple (2-person household, 2026):
| Income Source | Amount | Cumulative MAGI | ACA Status |
|---|---|---|---|
| Dividends + interest | $8,000 | $8,000 | ✅ Well under cliff |
| Roth conversion | $50,000 | $58,000 | ✅ Under $81,760 |
| Capital gains (brokerage sale) | $15,000 | $73,000 | ✅ Still under |
| Additional $9,000 conversion | +$9,000 | $82,000 | ❌ Over cliff by $240 |
That extra $9,000 in conversions pushed MAGI past $81,760. If the cliff rules apply, the couple just lost their entire premium tax credit. Depending on age and location, that subsidy could be worth $15,000-$22,000 per year.
They gained roughly $1,080 in tax-bracket optimization (12% × $9,000). They lost $15,000+ in subsidies. That's a $14,000 mistake.
The Number That Matters Most
For a 2-person household in 2026: $81,760. That's the MAGI ceiling that determines whether you get ACA subsidies or pay full freight on health insurance.
The conversion math works backward from this number. Start with $81,760, subtract your non-conversion income (dividends, interest, capital gains, any earned income), and the remainder is your maximum safe Roth conversion amount.
If your non-conversion income is $12,000 and you're a 2-person household:
$81,760 − $12,000 = $69,760 maximum Roth conversion
That $69,760 in conversions would use up $31,500 in standard deduction (0% rate), $23,850 in the 10% bracket, and $14,410 in the 12% bracket. Total federal tax: roughly $4,114. Effective rate on the conversion: 5.9%.
You're converting at rock-bottom tax rates AND keeping your subsidies. That's the sweet spot.
[INSERT CHART: Graph showing MAGI on x-axis and ACA subsidy value on y-axis for a 2-person household, with the cliff clearly marked at $81,760]Where Most People Misread This
The common mistake is treating Roth conversions and ACA subsidies as independent decisions. They're linked through MAGI, and every dollar of conversion has two costs: the income tax on the conversion and the marginal impact on your ACA subsidy.
Near the cliff, the effective cost of a conversion dollar isn't your marginal tax rate. It's your marginal tax rate plus the subsidy cliff penalty. A $1 conversion that triggers the cliff doesn't cost you 12 cents in tax. It costs you 12 cents in tax plus $15,000 in lost subsidies.
The other mistake: forgetting that capital gains, dividends, and interest count toward MAGI too. People plan their conversion amount perfectly, then sell some stock in December to cover an expense, and the realized gain pushes them over the cliff.
Calculate Your ACA Subsidy Impact
If you're a couple with $20,440 in Roth conversions and $15,000 in capital gains, your MAGI hits $35,440. That's well under the cliff, but how much more can you convert before subsidies disappear? Plug your numbers into BridgeToFI's calculator to see the exact subsidy impact.
Calculate Your ACA Subsidy Impact →Key Takeaways
Roth conversions = MAGI increase. Every dollar converted pushes you toward the ACA cliff.
2026 cliff (2-person): $81,760 MAGI. One dollar over can cost $15,000+ in subsidies.
Work backward. Subtract non-conversion income from your household's 400% FPL threshold to find your safe conversion limit.
Account for all income. Dividends, interest, capital gains, and earned income all count toward MAGI alongside conversions.
Check current law. Enhanced IRA subsidies may eliminate or modify the cliff for some plan years.
Frequently Asked Questions
Q: Do Roth conversions count as income for ACA subsidies?
Yes. Roth conversions from traditional IRA or 401(k) accounts are included in MAGI for ACA purposes. They're reported as ordinary income on your tax return and directly affect your premium tax credit eligibility.
Q: What is the ACA subsidy cliff for a household of 2 in 2026?
Approximately $81,760 (400% of the Federal Poverty Level for a 2-person household). Under cliff rules, exceeding this threshold means losing all premium tax credits. Check whether enhanced subsidies from the Inflation Reduction Act have been extended, as these may modify the cliff.
Q: How do I balance Roth conversions with ACA subsidies?
Calculate your maximum safe conversion by subtracting all non-conversion income from your household's 400% FPL threshold. The ACA subsidy (often $10,000-$25,000/year) typically exceeds the tax benefit of additional conversions, making subsidy preservation the priority for most early retirees.