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The Conversion Window

Between the day you stop drawing a W-2 and the day Social Security and your first RMD begin, you sit in the lowest-income years of your adult life—often a decade of them, sometimes more. The IRS will tax those years at the brackets you fill voluntarily. Fill them.

The structure Each year, project your ordinary income (pensions, taxable interest, dividends, consulting income, and planned capital gains). Identify your target ceiling: typically the top of the 24% federal bracket, the first IRMAA tier, or the NIIT threshold, whichever binds first. Convert pre-tax dollars to Roth up to that exact boundary. Always pay the conversion tax from your taxable brokerage account instead of the converted assets. Using converted dollars to pay the tax burns the tax shelter twice. Fund it from cash and high-basis lots instead of realizing large gains — late in life that trade inverts entirely, per the step-up logic of section “What to Spend, What to Leave”.

Why this is the highest-leverage tool you own

Paying the tax without a penalty A large conversion creates a liability the quarterly estimated-payment system was not designed around, and the cure is a quirk worth knowing: tax withheld from any IRA or 401(k) distribution is treated as paid evenly through the year under IRC §6654(g), “Failure by individual to pay estimated income tax”, no matter when it was actually withheld. A December distribution with heavy withholding can therefore retroactively cover a January conversion that quarterly estimates would have penalized. Retirees taking RMDs get this for free — set the withholding on the year-end RMD to true up the whole year’s liability — and anyone else can take a small distribution for the purpose. The safe harbors still apply on top: withholding 110% of last year’s total tax ends the question regardless of what the conversion did to this year’s.

The five-year clocks, briefly There are two, and they are commonly conflated. The conversion clock runs five years from each individual conversion and exists only to stop you from using a conversion to dodge the 10% early-withdrawal penalty under IRC §72(t), “Annuities; certain proceeds of endowment and life insurance contracts”; once you are past 59½ it is irrelevant, because §72(t) no longer applies to you at all. The account clock is a single five-year period running from your first contribution or conversion to any Roth IRA, and it governs whether earnings come out tax-free (section “Individual Retirement Arrangements (IRAs)”). It is not per-conversion — once that one clock has run, every subsequent conversion’s earnings are covered by it. For most retirees at 60+ with a long-established Roth, both are non-issues; for early retirees building a conversion ladder as a 72(t) alternative, time each tranche to season before it is needed (section “The Pre-RMD Tax Window”).

Where conversions are wrong

Converting into a drawdown. The tax is computed on the value on the conversion date, so a market decline lets you move the same shares across for less tax. A $300,000 traditional IRA that falls to $225,000 converts for three-quarters of the bill, and the recovery happens inside the Roth where it is never taxed again. Sometimes the effect is larger than the arithmetic suggests, because a smaller conversion fits entirely inside a cheaper bracket instead of straddling two.

Mind the trade-offs: the cash you use to pay the tax has usually fallen too, so the conversion consumes a larger fraction of a smaller taxable account — and if paying the tax forces you to sell depressed assets, you have funded a discount by realising a loss elsewhere. And nobody identifies the bottom. The workable version is not market timing but a standing rule: keep the annual conversion target set as a bracket ceiling instead of a dollar amount, and when the market hands you a decline, execute that year’s tranche early instead of waiting until December. You are not predicting anything, only refusing to convert at the highest price of the year out of habit.

Converting an illiquid asset, and the limits of the discount. A more aggressive version converts a privately held position — a fund interest, an LLC stake, real property — held in a self-directed IRA (section “Self-Directed IRA”). Because the conversion is valued by appraisal, not a screen price, and because appraisals of minority interests in illiquid entities carry discounts for lack of marketability and lack of control, the tax is computed on a number below pro-rata net asset value. Convert an interest early in a fund’s life — when the J-curve has it marked below cost — and every dollar of the eventual recovery lands in the Roth.

The technique is real; the version circulating online is not. Three corrections. First, the discounts are two, not three: lack of marketability and lack of control, with “minority interest” describing the latter, not acting as a separate haircut to stack on top. Defensible combined discounts run in the 20–40% range described in section “LLCs for Estate Planning” — not the 50% and 60% figures that appear when the same discount is counted twice under different names. Second, the discount has to describe the interest you actually hold: an entity your IRA controls outright has no control discount, and claiming one invites the examiner to look at everything else. Third, your custodian already reports the account’s fair market value to the IRS every year on Form 5498, so a conversion-year appraisal that suddenly departs from the values you have been reporting is self-impeaching — the discount has to be the same story you were telling before you had a reason to want it.

Then the risks that have nothing to do with valuation. Holding private interests in an IRA puts you one step from IRC §4975: the disqualified-person rules reach your own entities, and the penalty is deemed distribution of the entire account. Leverage inside the entity generates UDFI taxable to the IRA at trust rates (section “Unrelated Business Taxable Income (UBTI)”), and real property held this way forfeits depreciation entirely. The founder whose retirement account famously grew to nine figures did it by buying founder shares in his own company at a nominal price — which illustrates a prohibited-transaction trap, not a compliant blueprint. If this is attractive, it is attractive with an appraiser and counsel who will both put their name on it.

The five- to ten-year drawdown picture Run the conversion schedule as a structured multi-year plan, not a reactive annual calculation. A reasonable target for a couple retiring at age 62 with a large pre-tax balance is to convert enough by age 72 that the residual RMD at age 75 sits comfortably below the IRMAA tier they want to live in. Working backwards from that target sets the size of each annual conversion.

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