Educational information, not individual financial advice.
Key Takeaways
A Roth conversion ladder is a series of annual conversions designed to fill lower tax brackets over several years while setting up a penalty-free withdrawal stream. It's the classic tool for early retirees who want to access retirement money before age 59½.
Each Roth conversion starts its own 5-year clock. After 5 years, the converted principal can be withdrawn from the Roth without the 10% early-withdrawal penalty (conversion earnings have a separate rule but are also penalty-free after 59½).
A ladder looks like:
Starting Year 6, you can withdraw $50,000 of principal per year tax- and penalty-free, while continuing to convert in future years to extend the ladder.
Consider a 50-year-old who has retired with $2M in pre-tax accounts and $500k in a taxable brokerage. They need to cover 9.5 years of spending until age 59½, when they can freely access pre-tax accounts.
Option 1: withdraw from the 401(k) using 72(t) substantially equal periodic payments. Works but rigid and penalty-triggering if any rule is violated.
Option 2: live off the taxable account for the first 5 years, building a conversion ladder during those same 5 years. Starting Year 6, the ladder provides penalty-free income. Continue the ladder if needed until 59½.
The ladder is more flexible than 72(t) and also reduces future RMDs.
There are actually two 5-year rules that can confuse:
Rule A — Roth IRA 5-year rule for tax-free earnings. Starts with your first Roth IRA contribution ever. Once this has passed, all Roth earnings are tax-free (provided you're over 59½ or an exception applies).
Rule B — Roth conversion 5-year rule for penalty-free principal. Starts separately for each conversion. Allows the converted principal to be withdrawn penalty-free (tax was already paid at conversion).
Rule B doesn't apply once you're 59½. Rule A applies regardless of age.
For an early retiree under 59½, Rule B is what makes the ladder work. Each conversion has its own 5-year window before its principal can flow out penalty-free.
Common approaches:
Fill the next bracket. Convert enough each year to reach the top of the 12% or 22% bracket without crossing. This maximizes the tax-favorable conversion amount each year.
Target a specific future need. If you'll need $60,000/year in year 6+, convert $60,000/year starting now. The ladder matches the future spending.
Target a specific future balance. If you want $500,000 in Roth by age 65, calculate the annual conversion amount needed given your growth assumption and time remaining.
A 55-year-old MFJ couple with $200,000 of taxable dividend/interest income and a large Traditional IRA:
The Roth Conversion page in Horizons supports multi-year conversion plans. You can set annual conversion amounts (or rules like "convert to top of 22% bracket"), and the engine shows the effect on your cumulative taxes, future RMDs, Medicare premiums, and end-of-plan Roth balance. Compare scenarios side by side to see which ladder structure maximizes after-tax wealth or minimizes IRMAA impact.
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