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Updated July 30, 2026. Quick answer (2026): A Roth conversion and a tax-deferred withdrawal are the same kind of income and consume the same bracket space. If a conversion is planned, spending from taxable preserves the low-bracket room the conversion needs.
Conversion sizing is an annual decision with lifetime consequences.
Getting the amount right each year, against brackets and thresholds that move, is ongoing work.
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A conversion and a withdrawal compete for the same room
Both a Roth conversion and a tax-deferred withdrawal are ordinary income. They fill the same brackets, in the same year, from the same account. Treating them as separate decisions is how people end up converting into a bracket they did not intend to reach.
Which is why spending from taxable comes first in a conversion year
If a conversion is planned, sourcing this year’s spending from the taxable account preserves the low-bracket room the conversion needs. Spending from the tax-deferred account instead consumes that room and pushes the conversion into a higher bracket — paying more to move the same money.
The sequencing that follows
- Take any RMD first — it is mandatory, and it also cannot be converted.
- Fund living costs from taxable, where only the gain is taxed.
- Use the remaining bracket room for the conversion.
- Leave Roth untouched: converting into it and withdrawing from it in the same year is self-cancelling.
The constraint people forget
An RMD cannot be converted, and must be satisfied before any conversion from that account. Once RMDs have begun, the conversion window is smaller than it looks — another reason the pre-RMD years carry most of the value. See the pre-Social-Security window.
Related
Methodology
- This is a single-year, deterministic comparison of the marginal tax cost of one more dollar from each account type. It does not project returns, future brackets, or a lifetime drawdown path, because those depend on assumptions no calculator can verify.
- Every rate is a USER INPUT. Ordinary brackets, long-term capital gain brackets and IRMAA tiers are all indexed annually, so none of them is hardcoded anywhere in this cluster.
- A required minimum distribution is taken first because it is mandatory, not because it is cheapest. Roth is placed last regardless of the single-year arithmetic, which would otherwise drain it first.
- Figures were computed by two independently written engines that agree to the cent, with invariants asserting RMD-first ordering, Roth-last ordering, and that a shortfall is reported rather than silently satisfied.
- Federal only, and excludes state tax, the taxation of Social Security benefits, and ACA premium credits.
Educational estimate, not tax advice. Confirm anything that changes a filing or distribution decision with a CPA.
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