Roth Conversion Ladder Calculator — Pre-Pay Taxes & Access IRA Money Before 59½
Simulate year-by-year Traditional → Roth conversions with 2025 federal brackets. Watch the 5-year seasoning ladder fill up with penalty-free principal — the core FIRE strategy for tapping retirement accounts early.
Quick answer: A FIRE retiree with $400,000 in a Traditional IRA and no other income who converts $30,000 per year pays only about $1,600 in federal tax per year (12% bracket, single filer, 2025). After 5 years, year-1's $30K becomes withdrawal-penalty-free, and the ladder provides a rolling stream of ~$30K/year accessible before age 59½. Total tax on a 10-year, $300K conversion ladder: roughly $16,000 — an effective 5.3% rate vs. the 22–24% they'd pay at required-minimum-distribution age.
Your ladder inputs
Pre-tax retirement balance you plan to convert over time.
Target: stay under the top of the 12% bracket for lowest tax drag.
Dividends, part-time W2, rental income. Fully retired? Leave at 0.
Ladder outcome
Year-by-year ladder
| Yr | Trad balance | Converted | Taxable inc. | Tax owed | Seasoned Roth | Roth balance |
|---|---|---|---|---|---|---|
| 1 | $400k | $30k | $30k | $2k | $0 | $30k |
| 2 | $394k | $30k | $30k | $2k | $0 | $62k |
| 3 | $388k | $30k | $30k | $2k | $0 | $96k |
| 4 | $381k | $30k | $30k | $2k | $0 | $131k |
| 5 | $374k | $30k | $30k | $2k | $30k | $169k |
| 6 | $366k | $30k | $30k | $2k | $60k | $209k |
| 7 | $358k | $30k | $30k | $2k | $90k | $252k |
| 8 | $350k | $30k | $30k | $2k | $120k | $297k |
| 9 | $341k | $30k | $30k | $2k | $150k | $345k |
| 10 | $331k | $30k | $30k | $2k | $180k | $395k |
Roth ladder fill
green = seasoned (accessible) · blue = total RothWhat is a Roth conversion ladder?
A Roth conversion ladder is a tax-arbitrage strategy popular in the FIRE (Financial Independence, Retire Early) community. The core idea: Traditional 401(k) and IRA dollars were never taxed on the way in, so they get taxed as ordinary income whenever you pull them out. If you retire early and have no wages, your taxable income drops to near zero — which means you can voluntarily move money from Traditional to Roth and pay tax in the 10% or 12% bracket, instead of the 22–24% you likely paid while working. Converting $30,000/year at a blended rate of ~5% is dramatically cheaper than waiting until age 73 for required minimum distributions (RMDs) and paying 22%+ on each forced withdrawal.
The “ladder” part solves a separate problem: the 10% early-withdrawal penalty that normally hits Traditional IRA distributions before age 59½. Each year's conversion has its own 5-year seasoning clock. Conversions that have sat for 5 full tax years can be withdrawn penalty-free at any age. So if you retire at 45 and start converting $30K/year immediately, by age 50 your first year's conversion becomes withdrawable, and from age 50 onward you have a rolling $30K/year income stream that's both principal (tax-free to withdraw because tax was already paid at conversion) and penalty-free (because it's seasoned). That covers the gap between FIRE retirement and age 59½.
The 5-year seasoning rule, explained
IRS Pub 590-B is precise: each Roth conversion starts its own 5-tax-year clock on January 1 of the year the conversion happened. A conversion in June 2026 is seasoned on January 1, 2031. Once seasoned, the converted principal(the amount you moved) can be withdrawn before 59½ with no 10% penalty and no tax (because tax was paid at conversion). Growth on the conversion is a separate animal — it follows the Roth's own 5-year rule plus the age 59½ requirement for tax-free withdrawal.
That's why FIRE practitioners build 5 years of taxable-brokerage runway before pulling the ladder's first rung. Years 1–5 of early retirement: live off taxable brokerage accounts while running conversions. Year 6 onward: start withdrawing year-1's seasoned conversion, plus continue converting a new slice. Each year's conversion is accessible 5 years later in perpetuity.
Important: the 5-year conversion clock is separate from the 5-year clock that applies to the Roth account itself (for tax-free earnings). And if you have multiple conversions, each has its own independent seasoning — not pooled. This calculator tracks conversions year-by-year for exactly this reason.
When a Roth ladder makes sense (and when it doesn't)
Strong case: you retired early, your wage income is zero, you have taxable-brokerage cash to fund both 5 years of living expenses and the conversion tax bill, you expect either future bracket increases (TCJA sunsets at end of 2025 absent extension) or large Traditional balances that will trigger high-bracket RMDs at 73, and you have a long time horizon for Roth compounding.
Weak or negative case:you're still earning W2 wages at 24%+ marginal — in that case a conversion stacks on top of your wages and pays the worst possible rate. Also negative if you expect your retirement bracket to be lowerthan today (e.g., you're currently at 12% and will likely withdraw at 10%), if you'll need the Roth earnings (not principal) before age 59½ since those stay taxable/penalized, or if you have pro-rata issues from non-deductible Traditional IRA basis that would poison the conversion.
Common target: keep total taxable income (other income + conversion) under the top of the 12% bracket — $48,475 taxable for single in 2025, $96,950 taxable for MFJ. Add the standard deduction back and you can convert up to roughly $63,475 single / $126,950 MFJ per year while staying in the 12% bracket. Anything over that jumps to 22% and the arbitrage gets thinner.
Frequently asked questions
What is a Roth conversion ladder?
A Roth conversion ladder is a staggered sequence of annual Traditional → Roth IRA conversions, typically executed in low-income years of early retirement. Each conversion is taxed as ordinary income in the year it happens, but once a conversion has sat in the Roth for 5 tax years, the converted principal (not the earnings) can be withdrawn before age 59½ without the 10% early-withdrawal penalty. A typical FIRE retiree converts $30K–$50K per year starting right after leaving work.
How does the 5-year seasoning rule work?
The 5-year clock runs separately for every conversion. A conversion made in 2026 becomes penalty-free on January 1, 2031 (start of the 5th tax year after). That's why it's called a ladder — convert every year, wait 5 years, then start pulling last year's conversion while the newest one is still seasoning. Earnings on converted money still require age 59½ or the Roth account's own 5-year rule to be withdrawn tax-free.
How much federal tax will I owe on a $30,000 conversion?
For a single filer in 2025 with no other income, $30,000 of conversion income minus the $15,000 standard deduction leaves $15,000 taxable. Tax = 10% × $11,925 + 12% × $3,075 = roughly $1,561. Total tax bill: ~$1,561, or an effective 5.2% on the conversion. Keep conversions under ~$63,475 for single or ~$126,950 for MFJ to stay inside the 12% bracket and minimize drag.
When does a Roth conversion ladder make sense?
Three conditions: (1) you expect your retirement tax bracket to be lower than your working-years bracket (classic case: convert at 12% now, avoid future 22–24%); (2) you have enough taxable brokerage cash to pay the conversion tax from outside the IRA — paying tax from the IRA itself defeats the purpose; (3) you need penalty-free access to retirement money before age 59½, which the ladder enables after year 5. FIRE retirees in their 40s–early 50s hit all three.
What about the pro-rata rule?
If you hold both pre-tax Traditional IRA money AND after-tax (non-deductible) basis across all your Traditional IRAs, the IRS requires you to convert them proportionally — you cannot cherry-pick the non-deductible basis for a tax-free conversion. This calculator assumes 100% pre-tax balances and does not model pro-rata. If you have non-deductible basis, file Form 8606 and compute the taxable fraction manually, or consult a CPA. 401(k) balances are not pooled with IRAs for pro-rata purposes.
Are state taxes included in this calculator?
No. This tool models only federal income tax using 2025 brackets and the standard deduction. State tax varies from 0% (TX, FL, NV, WA, TN) to over 10% (CA top bracket), and some states partially or fully exempt Roth conversions — Illinois, Pennsylvania, and Mississippi generally do not tax qualified retirement distributions, including conversions, while most states tax them as ordinary income. Add your state marginal rate to the federal number for a full estimate.