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Updated July 30, 2026. Quick answer (2026): The gap between retiring and claiming Social Security is usually the lowest-income stretch of a lifetime. Tax-deferred withdrawals and Roth conversions are cheaper in that window than they will ever be again, and the window does not reopen.
This window is worth planning properly, because it does not reopen.
The gap years carry more tax leverage than any other stretch of retirement, and they are finite.
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The cheapest tax years of your life, and they expire
Between the last paycheque and the first Social Security payment, taxable income is often at its lowest for decades. Wages have stopped, benefits have not started, and RMDs are years away. Ordinary income is cheap in that window in a way it will not be again.
Which argues for doing the opposite of the instinct
The instinct is to spend from taxable and leave the tax-deferred account alone. In this specific window that is usually backwards. Low-bracket room does not carry forward — unused, it is simply gone — so filling it with deliberate tax-deferred withdrawals or Roth conversions converts future expensive income into present cheap income.
The window closes twice
Once when Social Security starts and adds a permanent income floor, and again when RMDs begin and add a mandatory one. After both, ordinary income has a high baseline and every additional dollar is taxed on top of it. Anything not done in the gap gets done later at a worse rate.
The interaction worth checking
Realising income in these years can affect the taxation of benefits once they start and can push you across an IRMAA threshold two years later, since IRMAA looks back. Neither reverses the argument; both change the right size of the withdrawal, which is what the calculator is for.
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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