Guide
The Roth conversion ladder
A ladder spreads Roth conversions across tax years. Each step has an immediate tax cost, its own timing rule, and effects beyond the income-tax bracket.
By Steven, Founder · Updated September 2, 2026
Short answer
- A ladder spreads taxable Roth conversions across several lower-income years.
- Conversion principal and Roth earnings are governed by distinct five-year concepts.
- Federal brackets, IRMAA, marketplace credits, and future RMDs should be evaluated together.
Use lower-income years deliberately
In years between work and later income sources, converting traditional retirement money to a Roth IRA can use tax brackets that would otherwise be empty. A taxable conversion is ordinary income in the year it occurs and reduces the traditional balance exposed to future RMDs.
A ladder repeats planned conversions across several tax years. A bracket ceiling can be one constraint, but the amount also has to account for other income, deductions, Medicare IRMAA, and marketplace premium-tax-credit eligibility.
Measure the tax across every bracket the conversion fills
A conversion sits on top of other ordinary income. If it crosses a bracket boundary, part is taxed at one rate and the remainder at the next rate.
The relevant conversion cost is the extra federal tax caused by the conversion divided by the amount converted. The Roth conversion calculator integrates the tax across that span instead of multiplying the full amount by only the top rate.
Keep the two five-year rules separate
Each taxable conversion has its own five-tax-year period when determining whether an early distribution of converted principal may face the 10% additional tax before age 59½. That conversion clock is one reason an early-retirement ladder is planned years ahead.
A different five-year rule helps determine whether Roth IRA earnings are part of a qualified distribution. The earnings rule generally begins with the first tax year for which you made a contribution to any Roth IRA. The two clocks answer different questions.
Watch the income thresholds a conversion can cross
Conversion income can push Medicare MAGI into a higher IRMAA tier two years later. Before Medicare eligibility, it can also change or eliminate a marketplace premium tax credit under the rules for that coverage year.
Check those effects separately from the conversion's federal income tax. They are not included in the Roth conversion calculator result.
Compare a ladder with other early-access routes
A conversion ladder requires taxable conversions and waiting periods. A 72(t) substantially equal periodic payment plan is a different route that can permit earlier withdrawals but requires a continuing payment schedule under IRS rules.
Neither route is reversible in the way a simple cash-flow estimate is. Confirm account eligibility, ordering rules, and the tax consequences for the specific plan before acting.
Related free calculators
Frequently asked
- How much should I convert each year?
- There is no universal amount. Start with other taxable income, calculate the brackets the conversion would fill, and separately test IRMAA and marketplace-credit effects before choosing a figure.
- Is the conversion five-year rule the same as the qualified-distribution rule?
- No. Converted amounts can have separate five-tax-year clocks for the additional-tax rules, while the qualified-distribution clock for Roth IRA earnings generally begins with the first Roth IRA contribution year.
Read next
Sources
- Revenue Procedure 2025-32 — Internal Revenue Service
The 2026 federal income-tax brackets and standard deductions.
Accessed September 2, 2026
- Roth IRAs — Internal Revenue Service
Roth IRA contribution, distribution, and conversion tax treatment.
Accessed September 2, 2026
- Publication 590-B (2025) — Internal Revenue Service
The Uniform Lifetime, Joint Life, and Single Life tables used for 2026 distributions.
Accessed September 2, 2026
- 2026 Medicare Parts A & B premiums and deductibles — Centers for Medicare & Medicaid Services
The 2026 Part B premium and Part B and Part D income-related adjustment tables.
Accessed September 2, 2026
- Revenue Procedure 2025-25 — Internal Revenue Service
The 2026 premium-tax-credit applicable-percentage table.
Accessed September 2, 2026
This is an educational estimate, not tax or financial advice. Figures reflect the law year shown and the inputs you provide. Consult a qualified professional before acting.