Roth Conversion Calculator
Analyze whether converting a Traditional IRA to a Roth IRA makes financial sense based on your current tax rate, expected retirement rate, and time horizon.
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Advanced Roth Conversion Analysis 2026 IRMAA
⌄Personalized conversion analysis appears after you Calculate
The Golden Window — Why Ages 60-72 Are Conversion Prime Time
Most retirees experience an unusually low-income period after retiring (60-65) but before Social Security and RMDs begin. This "gap years" window is the highest-leverage conversion opportunity of your life: your bracket may be 12-22% during gap years vs 24-32% before retirement and after RMDs begin. Converting at 12-22% saves 10+ percentage points per dollar converted.
| Life Stage | Typical Bracket | Conversion Verdict | Why |
|---|---|---|---|
| Pre-retirement (50-60) | 22-32% | Probably Don't | Peak earnings — wait for the gap years |
| Early retirement (60-65) | 10-22% (low) | CONVERT AGGRESSIVELY | Lowest bracket window. Pre-Medicare = no IRMAA risk. |
| Medicare years (65-72) | 12-22% | Convert with IRMAA awareness | Watch the $109K/$218K cliffs — but conversions still valuable |
| Post-RMDs (73+) | 22-32% | Limited window | RMDs raise base income; less bracket space |
Why this window is closing
- Every year delayed shrinks the window. Your IRA balance grows 7%/yr, RMDs grow proportionally, and the bracket space available for conversion shrinks.
- OBBBA made TCJA rates permanent for 2026+. No more "tax rate scheduled to rise" urgency, but the window mechanics still favor early action.
- RMD age rises to 75 in 2033 (SECURE 2.0). This actually extends the gap-year window by 2 years for those reaching 73 after 2033 — but most current retirees still face age 73.
- Surviving spouse implication: If one spouse dies, the survivor files single — much narrower brackets. Aggressive conversion while both spouses are alive can save the survivor from much higher rates.
Sources: IRS Notice 2025-67 for 2026 brackets; SECURE 2.0 §107 for RMD age 73→75 phase-in. The "gap years" framing is canonical in Kitces, Pfau, and Bogleheads literature on tax-efficient withdrawal sequencing.
Multi-Year Conversion Ladder — Spread the Tax Bite
Converting a large pre-tax balance in one year almost always pushes you into higher brackets. The optimal play is a multi-year ladder: convert smaller amounts each year for 5-13 years, filling lower brackets, never crossing into a higher one. This compounds to enormous savings vs a single large conversion.
Single conversion vs 10-year ladder ($1M Trad IRA, MFJ)
| Strategy | Year 1 | Average Bracket Hit | Total Tax Cost | vs Optimal |
|---|---|---|---|---|
| Single $1M conversion at age 62 | $1,000,000 → bracket 35% | ~28% blended | ~$280,000 | +$130,000 worse |
| 10-year ladder $100K/yr | $100K/yr in 22% bracket | ~22% hold | ~$220,000 | +$70,000 worse |
| 13-year ladder $77K/yr | $77K/yr in 12% bracket | ~15% blended | ~$150,000 | Optimal |
Assumes MFJ filing, 2026 brackets, no other ordinary income (early-retired with portfolio income only). Actual results vary based on Social Security timing, pension, and capital gains.
Five-year rule on conversions (penalty-free withdrawal)
Each conversion has its OWN 5-year clock for penalty-free withdrawal of the converted amount (separate from the contribution 5-year rule). Converting at 50? You can withdraw the conversion (penalty-free, since tax already paid) at 55. This is the foundation of FIRE retirement plans — convert pre-tax balances each year, then withdraw the converted amounts 5 years later, all penalty-free even before 59½.
| Conversion Year | Earliest Penalty-Free Withdrawal | FIRE Use Case |
|---|---|---|
| 2026 conversion at age 50 | Jan 1, 2031 (age 55) | Funds living expense at 55 |
| 2027 conversion at age 51 | Jan 1, 2032 (age 56) | Funds living expense at 56 |
| 2028 conversion at age 52 | Jan 1, 2033 (age 57) | Funds living expense at 57 |
Conversion 5-year rule per IRC §408A(d)(3)(F). Each conversion has a separate clock — careful tracking is essential. Converted earnings are subject to BOTH the 5-year rule AND age 59½. Source: IRS Publication 590-B (Distributions from IRAs).
IRMAA Cliff Risk — The Hidden 2-Year Lookback
A Roth conversion increases your MAGI in the conversion year — and that MAGI determines your Medicare premium two years later. Convert in 2026? Your 2028 Medicare premiums are affected. IRMAA brackets are cliffs, not graduated: $1 over a threshold triggers the FULL surcharge for that tier. This is the #1 conversion-planning mistake.
| 2026 IRMAA Tier (per CMS) | Single MAGI | MFJ MAGI | Part B Surcharge/mo | Part D Surcharge/mo | Annual Cost (couple) |
|---|---|---|---|---|---|
| Tier 0 (no surcharge) | ≤ $109K | ≤ $218K | $0 | $0 | $0 |
| Tier 1 | $109K-$137K | $218K-$274K | +$81.20 | +$14.50 | ~$2,297 |
| Tier 2 | $137K-$170K | $274K-$340K | +$203.00 | +$36.30 | ~$5,752 |
| Tier 3 | $170K-$205K | $340K-$410K | +$324.80 | +$58.10 | ~$9,189 |
| Tier 4 | $205K-$500K | $410K-$750K | +$446.60 | +$80.00 | ~$12,638 |
| Tier 5 (top) | ≥ $500K | ≥ $750K | +$487.00 | +$91.00 | ~$13,872 |
The 2-year lookback timing
- 2026 MAGI → 2028 IRMAA (and 2027 MAGI → 2029 IRMAA, etc.)
- This means conversions done in your 60s (pre-Medicare) have NO IRMAA impact at all — the lookback predates Medicare enrollment.
- Conversions done at 63 or 64 are particularly powerful — they don't trigger any IRMAA because Medicare hasn't started yet, and the 2-year lookback means even age 63's MAGI is "free" from the IRMAA system.
- Form SSA-44 ("Life-Changing Event") allows appealing IRMAA based on more recent income if you've retired, divorced, or lost a spouse. Roth conversions do NOT qualify as a life-changing event.
QCD as IRMAA management tool
Qualified Charitable Distributions from IRAs (up to $108,000 in 2026, age 70½+) reduce MAGI dollar-for-dollar — they count toward RMDs but don't show up in MAGI. If you're charitably inclined and near an IRMAA cliff, QCDs are the most efficient tool to stay below the threshold. A $20,000 QCD instead of a $20,000 RMD-then-donation pulls your MAGI down by $20,000 with the same charitable outcome.
Sources: CMS 2026 Medicare Parts A & B Premiums and Deductibles; Kiplinger 2026 IRMAA brackets. QCD limit per IRC §408(d)(8) as adjusted by SECURE 2.0 §307. Annual couple cost figures assume both spouses on Medicare (each pays the surcharge individually).
Breakeven Math — When Does the Conversion Pay Off?
A conversion's value depends on (now-rate vs future-rate), time horizon, and where you pay the conversion tax from. Paying the tax from the converted amount itself is much weaker than paying from outside funds. Below: live calculator + breakeven scenarios.
| Convert now (pay $22K tax outside, $100K compounds tax-free) | $386,968 tax-free |
| Don't convert (Trad grows + outside funds compound separately) | ~$386,140 net + outside growth |
| Conversion advantage (after-tax) | +$92,872 |
When breakeven flips
| Scenario | Recommendation | Why |
|---|---|---|
| Now-rate > future-rate by 6+ pts | Don't convert | Wait — you'll pay less in retirement |
| Now-rate ≈ future-rate | Marginal value | Convert IF other benefits matter (no RMDs, heir tax-free) |
| Now-rate < future-rate by 5+ pts | Convert aggressively | Each $ converted saves the bracket-difference forever |
| Pay tax from conversion itself | Reduces value 30-40% | Smaller compounding base; only convert if surplus cash to pay tax |
Conversion math assumes constant rates and returns over the period. In practice, year-by-year planning with shifting income makes the analysis more complex. The "pay from outside" requirement is critical: paying conversion tax from the conversion itself reduces the converted base by the tax rate, often eliminating the advantage entirely.
Partial vs Full Conversion — How Much Should You Convert?
Almost no one should convert their entire pre-tax balance in one year — that's a recipe for jumping multiple tax brackets and triggering IRMAA. The optimal answer is almost always a partial conversion sized to fit the available bracket space + IRMAA tier ceiling, repeated annually.
Bracket-fill conversion 22%
Convert exactly enough to fill the 22% bracket. 2026 MFJ: 22% bracket ends at $206,700. If other income is $80K, convert ~$126K. Anything more crosses into 24%.
IRMAA-aware conversion $218K
For Medicare-aged: stay below the IRMAA cliff. MFJ Tier 0 ends at $218K. Even if 22% bracket has more room, exceeding $218K costs $2,297/yr in IRMAA — which usually wipes out the conversion's tax savings.
NIIT-aware conversion 3.8%
Conversion itself is NOT subject to the 3.8% Net Investment Income Tax — it's ordinary income. But it DOES raise MAGI, which can push other investment income into NIIT territory. Watch the $250K (MFJ) / $200K (single) NIIT threshold.
Social Security taxability 85%
If you're already receiving SS, conversion income raises provisional income — potentially making more of your SS taxable (up to 85%). For MFJ, the 85% threshold hits at $44K provisional income. SS Tax Calculator →
State residency timing CA→FL
If you plan to move from a high-tax state (CA 13.3%) to a no-tax state (FL/TX/NV/WA), defer conversions until AFTER establishing residency. Save the state tax on every dollar converted.
Annual ladder approach 10yr
Most retirees convert over 5-13 years. Annual amount = (target final-Roth balance) / (years available). Year-by-year monitoring and adjustment based on actual brackets and IRMAA proximity.
| 2026 Federal Brackets (MFJ) | Income Range | Rate | Conversion Strategy |
|---|---|---|---|
| 10% | $0-$23,850 | 10% | Convert aggressively if you can stay here |
| 12% | $23,850-$96,950 | 12% | Optimal conversion bracket — fill it every year |
| 22% | $96,950-$206,700 | 22% | Solid conversion bracket; watch IRMAA at $218K MFJ |
| 24% | $206,700-$394,600 | 24% | Marginal — usually only when comparing to 32% RMDs |
| 32-37% | $394,600+ | 32-37% | Generally don't convert at these rates |
2026 brackets per IRS Notice 2025-67. The "fill the bracket" framework is the consensus approach across financial-planning firms (Vanguard, Fidelity, Schwab) and academic literature on tax-efficient withdrawal sequencing. Year-by-year adjustment is crucial — set-and-forget conversion plans rarely optimize.
Continue your Roth decision
Things to Know
Essential concepts for understanding your results
StrategyWhen does a Roth conversion make sense?
Convert traditional IRA/401(k) to Roth when your current tax rate is lower than expected future rate. Prime opportunities: early retirement years before Social Security (ages 60-67), years with unusually low income (job transition, sabbatical), years before RMDs begin (age 73), or if you expect tax rates to increase. Convert enough to fill your current bracket but not push into the next — this is the bracket-filling strategy.
Tax CalculationHow much tax do you pay on a Roth conversion?
The converted amount is added to your ordinary income for the year. Converting $50,000 in the 22% bracket costs $11,000 in federal tax plus state tax. Critical: pay the tax from non-IRA funds. Using IRA money to pay tax reduces the amount converted and may trigger a 10% penalty if under 59½. A $50,000 conversion paid with $11,000 from checking is superior to a $39,000 conversion where $11,000 stays taxed in the traditional account.
Five-Year RuleWhat is the Roth conversion five-year rule?
Each conversion has its own 5-year clock before converted funds can be withdrawn tax and penalty-free (if under 59½). The clock starts January 1 of the conversion year. A 2026 conversion is accessible penalty-free January 1, 2031. After age 59½, the 5-year rule no longer applies to conversions — only to earnings on contributions. This rule is why early retirees should start conversions early to create accessible Roth funds.
RMD ReductionHow do Roth conversions reduce future RMDs?
Every dollar converted from traditional to Roth permanently exits the RMD calculation. A $500,000 traditional IRA at 73 requires ~$18,900 annual RMD (taxed as income). Converting $200,000 to Roth before 73 reduces the traditional balance to $300,000, cutting RMDs to ~$11,300. Over a 20-year retirement, this saves $150,000+ in RMD-driven taxes. The conversion window between retirement and 73 is the most valuable tax planning period.
What Is a Roth Conversion?
A Roth conversion moves money from a Traditional IRA or 401(k) to a Roth IRA, paying income tax on the converted amount now in exchange for tax-free growth and withdrawals forever. Unlike direct Roth IRA contributions, there are no income limits on conversions — anyone can convert any amount at any time.
Why would you voluntarily pay taxes? Because you are paying at today's known rate to avoid paying at tomorrow's unknown (and potentially higher) rate. If you convert $50,000 in the 22% bracket today, you pay $11,000 in tax. That $50,000 then grows tax-free — at 7% for 20 years, it becomes $193,000 of completely tax-free money. Without conversion, the same $193,000 would be taxed at withdrawal, costing $42,000-$67,000 in taxes at 22-35%.
The math is clear: the longer the money has to grow tax-free, and the higher your future tax rate, the more valuable the conversion. This makes Roth conversions one of the most powerful tax planning strategies available — especially during low-income years.
The Golden Window: When to Convert
Roth conversions are most valuable during years when your taxable income is temporarily low, creating a window to convert at a reduced tax rate:
Early retirement before Social Security (ages 60-67): If you retire at 60 and delay Social Security to 70, you may have 7-10 years with dramatically lower taxable income. This is the classic "Roth conversion window." Convert enough each year to fill up the 12% or 22% bracket — income that would otherwise be taxed at 24%+ when RMDs begin at 73.
Between jobs: A gap year, sabbatical, or career transition drops your income. Convert during this low-bracket year before higher income returns.
Market crashes: After a 30% market drop, your $500,000 Traditional IRA is worth $350,000. Converting now means paying tax on $350,000 instead of $500,000 — saving $33,000 in taxes at the 22% bracket. When the market recovers, the growth is tax-free in your Roth.
Before RMDs begin (age 73): Required Minimum Distributions force taxable withdrawals from Traditional accounts starting at 73. Large RMDs can push you into higher brackets, trigger Medicare IRMAA surcharges, and increase Social Security taxation. Strategic conversions before 73 reduce the Traditional balance, reducing future RMDs.
Before expected tax rate increases: Tax rates are historically low through 2025 (potentially extended). If you believe rates will rise in the future — whether from legislation, higher personal income, or RMDs — converting now locks in the lower rate.
How Much to Convert: The Bracket-Filling Strategy
The optimal conversion amount fills your current tax bracket without pushing you into the next one. This maximizes the tax efficiency of each dollar converted.
Example: A married couple with $60,000 in income (after standard deduction of $32,200 = $27,800 taxable). The 12% bracket extends to $96,950. They can convert $96,950 - $27,800 = $69,150 and pay only 12% on the entire conversion ($8,298 in tax). Going above $96,950 would trigger the 22% rate on excess dollars.
For many retirees in the conversion window, this means converting $50,000-$100,000 per year over 5-10 years — systematically moving their Traditional IRA balance to Roth before RMDs begin. The total tax bill is significant ($25,000-$50,000+) but saves far more in future taxes on decades of growth.
Watch for cascading effects: Conversion income can trigger Medicare IRMAA surcharges (higher premiums for 2 years), increase Social Security taxation, reduce ACA premium subsidies, and affect financial aid calculations. Model the full impact, not just the federal bracket.
Roth Conversion Ladder: Early Retirement Access
The Roth conversion ladder is the primary strategy FIRE practitioners use to access retirement funds before age 59½ without penalties:
Step 1: Convert a year's worth of living expenses from Traditional IRA to Roth IRA (paying taxes from a separate taxable account — never from the conversion itself).
Step 2: Wait 5 years. After 5 years, the converted amount (not earnings) becomes accessible penalty-free and tax-free.
Step 3: Repeat each year. After the initial 5-year seasoning period, you have a new batch of accessible funds becoming available every year — a "ladder" of conversions providing perpetual access.
Bridge funding: During the first 5 years (while waiting for the ladder to mature), live on Roth IRA contributions (always accessible), taxable brokerage accounts, or the Rule of 55 from your last employer's 401(k).
Common Roth Conversion Mistakes
Paying the tax from the conversion itself: If you convert $100,000 and withhold $22,000 for taxes, only $78,000 goes to your Roth — and the $22,000 withheld is treated as an early distribution with a 10% penalty if you are under 59½. Always pay the tax from a separate account (checking, taxable brokerage) to maximize the Roth balance.
Converting in a high-income year: Converting on top of a $200,000 salary pushes dollars into the 32-35% bracket. Unless you expect even higher rates in the future, wait for a low-income year. The value of Roth conversion depends entirely on paying a lower rate now than you would pay later.
Ignoring state taxes: If you live in a high-tax state now but plan to retire in a no-tax state (Florida, Texas, Nevada), consider waiting to convert until after the move. You could save 5-13% in state income tax on the entire conversion.
Converting too much in one year: A massive single-year conversion can trigger IRMAA (Medicare surcharges lasting 2 years), spike your effective tax rate, and push Social Security into the 85% taxable threshold. Spread conversions over multiple years for optimal tax efficiency.
Frequently Asked Questions
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