Should I convert a little each year instead of all at once?

Converting a large pre-tax balance in one year concentrates the income into the highest brackets. Spreading the conversion over several years keeps each year's conversion income in lower brackets, usually reducing the total tax paid. This is a staged (or laddered) conversion plan.

Common staging strategies

• Fill to bracket top. Each year, convert exactly enough to bring taxable income to the top of a chosen bracket (for example, the 22% or 24% bracket). Conversion size varies year to year with other income and bracket inflation adjustments. This maximizes the amount converted at or below the chosen rate.
• Even split. Divide the balance by the number of years and convert a fixed amount annually. Simple and predictable, but some years may spill into higher brackets and others may leave bracket room unused.
• Fixed dollar amount. Convert a chosen amount per year (for example, $50,000/yr) until the balance is exhausted. Useful when the amount is set by a constraint other than brackets, such as cash available to pay the tax.

The typical window

Staged plans are most effective in years of unusually low income — commonly the gap between retirement (earned income ends) and the start of required minimum distributions and/or Social Security. In that window, conversions can fill bracket space that would otherwise go unused, while also shrinking the future RMDs that the unconverted balance would generate.

What staging trades off

• Money converted later spends more years growing pre-tax, so the eventual conversions may be larger in dollar terms.
• Bracket thresholds adjust with inflation annually, and statutory rates can change; a multi-year plan relies on assumptions about future brackets.
• Each conversion starts its own 5-year clock for penalty-free access to the converted principal before age 59½ (see the 5-year rules).