There’s a stretch of years in early retirement that quietly offers more tax-planning leverage than any other period in most people’s lives — and the great majority of people coast straight through it without realizing what they had.
It’s the window between when your paycheck stops and when your two big sources of forced income switch on: Social Security (whenever you claim it) and required minimum distributions (which now begin at 73, or 75 if you were born in 1960 or later). For someone who retires in their early sixties and delays Social Security, that can be a five-to-ten-year span where earned income has ended but forced income hasn’t started. Taxable income, often for the only time in an adult life, is genuinely low — and largely within your control.
That combination is rare and valuable. Empty low tax brackets, sitting there unused, with the flexibility to decide how much income to put into them. What you do — or don’t do — in that window can swing the lifetime tax bill on a retirement portfolio by six figures. This is about understanding how that window works and the questions worth asking inside it, rather than prescribing a single answer, because the right move depends entirely on your numbers and your goals.
Why the Window Exists — and Why It Closes
The Gap Years
A Retiree’s Taxable Income Over Time
To see the opportunity, it helps to see the shape of a typical retiree’s taxable income over time.
While working, income is high and largely fixed. Then you retire, and for a few years income can drop sharply — no salary, Social Security not yet claimed, RMDs not yet begun. You’re living off cash, taxable brokerage withdrawals, and maybe modest portfolio income, none of which throws off much taxable income. Your bracket falls, sometimes dramatically. (How you source those early-retirement withdrawals is its own sequencing question; the gap years are where that sourcing decision and Roth-conversion strategy come together.)
Then the window slams shut. You claim Social Security, and a few years later RMDs begin — and if your traditional IRA or 401(k) has been left untouched to compound, those required distributions can be large. Stacked on Social Security, they can push you into a higher bracket in your late seventies than you were in during the gap years, sometimes higher than while you were working. The income that was so low and controllable becomes high and forced.
The whole game of gap-years planning is recognizing that the low-bracket room available in those early years is use-it-or-lose-it. Every year you spend in the gap with your low brackets sitting empty is a year of cheap tax space gone forever. The goal is to deliberately fill that space — at today’s low rates — to pull income out of a future where it would be taxed at much higher ones.
The Core Move: Fill the Obvious Low Bracket
The foundational gap-years strategy is the partial Roth conversion: each year, move a deliberate slice of your traditional IRA into a Roth, paying tax on it now while your rate is low, so it grows tax-free, carries no future RMD, and comes out tax-free later.
The question is always how much. Our general starting point is simple to state: fill the obvious low bracket, and stop before the big jump. In 2026, the 12% bracket runs up to $100,800 of taxable income for a married couple before jumping to 22% — and the 24% bracket runs up to $403,550 before the leap to 32%. Those natural ceilings are where the bracket “jumps” are largest, so they make clean targets: convert up to fill the 12% (or the 24%, for higher-income households), and stop before tipping into the materially higher rate above it.
Fill the obvious low bracket, and stop before the big jump.
The logic is straightforward. Paying 12% now on dollars that would otherwise be forced out at 22% or more later is a clear win. Paying 12% now only to spill the next dollar into 22% this year is not — you’ve gained nothing. So the bracket ceiling is the natural governor on the conversion.
But — and this is where it stops being a formula — that starting point gets adjusted by several things that matter enormously, and that a rule of thumb completely misses. We work through each of these every time.
Adjustment 1: What Do You Actually Want This Money For?
Before optimizing anything, we ask what the money is for, because that determines whose taxes we’re even trying to minimize.
If you simply want to minimize your own lifetime tax bill and spend your money in your lifetime, we optimize for that. But if leaving a meaningful legacy is genuinely important to you, the question changes — now we’re looking at multi-generationaltotal tax, which can point to a very different answer. The strategy serves the goal; we don’t impose a goal to fit the strategy. Everything below flows from that first question.
Adjustment 2: The Charitable Override — Where QCDs Change the Math
If you’re meaningfully charitable, the gap-years calculus shifts — and this is one of the most overlooked interactions in retirement tax planning.
Here’s why. Starting at age 70½, you can make a Qualified Charitable Distribution (QCD): a direct transfer from your IRA to a qualified charity — up to $111,000 per person in 2026 — that satisfies your giving without the distribution ever being taxed. The money leaves the IRA, goes to the charity, and never appears in your taxable income. After RMDs begin, a QCD also counts toward satisfying your RMD for the year. It is, for a charitable retiree, one of the most tax-efficient ways to give that exists — and it sidesteps the new 2026 rule that imposes a 0.5%-of-AGI floor on itemized charitable deductions, because a QCD isn’t a deduction at all; it simply never gets taxed.
Now connect that to Roth conversions. A Roth conversion means paying tax now to move money out of the IRA. But for a charitable client, some of that IRA money was going to leave tax-free anywayas QCDs. Converting those dollars — and paying tax you didn’t have to — and then giving from the Roth is simply lighting money on fire. So for charitable clients, we generally convert less, and the bar for converting at all is higher.
But — and this matters — “charitable” does not mean “skip conversions and stop analyzing.” We still run the numbers every time, because there’s a real scenario where conversions win even for a generous giver: a very large IRA combined with low current income, where the future RMDs will be larger than the client actually wants to give. QCDs can only absorb so much — they’re capped, and more fundamentally they’re limited by how much you genuinely want to donate. If your forced RMDs at 75 will run well past your real charitable intent, that excess is going to be taxed as ordinary income at high rates no matter what. In that case, converting some of that excess now, at gap-years rates, can still beat letting the IRA balloon.
The analytical move we actually make: net the expected future RMDs against expected QCDs, and target conversions only at the gap in between. QCDs handle the giving, tax-free. Conversions handle only the taxable excess that giving won’t absorb. We’re not converting the whole IRA down; we’re converting the part your charitable plans won’t already take care of. (We’ll go deeper on QCDs and coordinated charitable giving in a dedicated piece.)
Adjustment 3: The Surviving Spouse — A Reason to Do More
For married couples, there’s a factor that pushes in the otherdirection — toward converting more during the gap years, not less.
At some point, one spouse will outlive the other, and the survivor typically files as a single taxpayer from then on. Single brackets are far narrower than joint ones, and Social Security taxation thresholds compress too — the combined effect often called the widow’s penalty — all while household income often barely falls. The result is that the same retirement income gets taxed much more harshly once there’s one filer instead of two.
That future is a reason to use the widejoint brackets now, while you have them. Converting more during the years you’re both alive — filling those generous married brackets at today’s rates — pulls income out of a future where the survivor would face it in compressed single brackets. The widow’s-penalty risk is one of the strongest arguments for being more aggressive with gap-years conversions, not less.
Adjustment 4: Whose Tax Rate Will Actually Pay It? (Beneficiaries)
When leaving assets to the next generation is a stated goal, the right comparison stops being “my rate now versus my rate later” and becomes “my rate now versus my heirs’rate later.” Under current rules, most non-spouse heirs must empty an inherited IRA within ten years — and they’ll pay tax on those distributions at their rates, stacked on top of their income.
That cuts both ways, and it genuinely flips the answer:
- If your heirs are high earners— the successful-professional children, already in top brackets — then leaving them a big traditional IRA means those dollars get taxed at high rates twice over (theirs, on top of their own income). Converting more now, at your lower gap-years rates, so they inherit a tax-free Roth, can be a major win for the family’s total tax.
- If your heirs are in low brackets— the schoolteacher, the pastor, the child in a modest-income field — the opposite holds. It may be better to convert less, leave the traditional IRA intact, and let them draw it down at theirlow rates. Paying your tax to convert would just be substituting your rate for their lower one — backwards.
This is why the beneficiary conversation only happens when leaving a legacy is something you actually care about — and why, when it is, we look at the whole family’s tax picture rather than just yours.
The Guardrails: Convert Up to the Torpedo, but Don’t Touch It
Two tripwires sit inside the gap-years window and set the practical ceiling on how much to convert in any given year — often below the bracket ceiling.
The first is the Social Security tax torpedo. It only becomes a live constraint once you’ve claimed benefits — which is part of what makes the earliest, pre-claiming gap years so clean. But once benefits are switched on, additional income can drag more of those benefits into taxation, spiking your real marginal rate well above your bracket. Our rule of thumb here is exactly that: convert up to the torpedo, but don’t touch it. Fill the low-rate room right up to the point where the next dollar would start pulling Social Security into taxation — and stop there, because beyond that point your true rate jumps in a way the bracket alone doesn’t show. (If a client has already blown well past the torpedo zone — enough income that more conversion doesn’t drag any additional Social Security into tax — then the torpedo stops being a factor, and it goes back to a straightforward tax-rate decision against the bracket.)
The second is IRMAA — the Medicare premium surcharges that kick in at hard income cliffs, with a two-year lookback. A conversion that crosses an IRMAA threshold can trigger hundreds or thousands in surcharges two years later, so we plan conversions to respect those cliffs rather than blow through them unaware.
One related note: the new 2026 senior deduction ($6,000 per person 65+) is a nice benefit, but it does notreduce AGI — so it doesn’t relieve either of these tripwires. It lowers taxable income without lowering the figure that drives Social Security taxation and IRMAA. Useful, but not a tripwire solution.
How We Think About It
The gap years are the closest thing retirement offers to a tax do-over, and the work is in using them deliberately rather than letting them slip by. Our process is consistent even though the answer never is: start with what the money is actually for; fill the obvious low bracket as a baseline; then adjust — convert less (but still analyze) for the charitable client whose QCDs will do the work, more for the couple bracing for the widow’s penalty, and in whichever direction the heirs’ tax rates point when legacy matters; all while respecting the torpedo and IRMAA as hard guardrails. It’s not a formula. It’s the same framework applied to a different set of numbers and goals every time — which is exactly why it’s worth doing carefully, in the narrow window when it’s still possible.
Common Questions
What are the “gap years,” exactly? The window between when your earned income stops (retirement) and when your forced income begins (Social Security and required minimum distributions, which start at 73, or 75 if born in 1960 or later). For someone who retires in their early sixties and delays Social Security, it can be a five-to-ten-year stretch where taxable income is unusually low and largely within your control — leaving low tax brackets sitting empty and available to fill at low rates.
Why is filling those low brackets such a big deal? Because the low-bracket room is use-it-or-lose-it. If you leave a traditional IRA untouched to compound, required distributions later can be large enough to push you into a higher bracket in your late seventies than you were in during the gap years. Deliberately recognizing income now — usually through partial Roth conversions — at low rates pulls that income out of a higher-taxed future. The general starting point is to fill the obvious low bracket (the top of the 12% bracket, or the 24%, depending on your income) and stop before the jump to the next rate.
I give a lot to charity. Should I still do Roth conversions? Maybe less, but don’t assume zero without running the numbers. Because Qualified Charitable Distributions (up to $111,000 per person in 2026, starting at age 70½) let you give directly from your IRA completely tax-free, converting those dollars first — and paying tax you didn’t have to — is wasteful. So charitable clients generally convert less. The exception: if you have a very large IRA and your future required distributions will exceed what you actually want to give, that taxable excess is coming out at high rates regardless, and converting some of it now can still make sense. The move is to net expected RMDs against expected QCDs and convert only the gap.
My spouse and I are married — does that change the strategy? It can push toward converting more. When one spouse dies, the survivor usually files as a single taxpayer, with much narrower brackets and lower Social Security taxation thresholds — often while household income barely drops. Converting more during the gap years, while you’re both alive and have the wider joint brackets, moves income out of that more harshly taxed single-filer future. The widow’s-penalty risk is one of the strongest reasons to be more aggressive with conversions, not less.
How do the Social Security “tax torpedo” and IRMAA limit my conversions? They often set the real ceiling, below the bracket ceiling. Our rule of thumb is to convert up to the tax torpedo but not into it — filling low-rate room right up to the point where the next dollar would start pulling Social Security benefits into taxation, then stopping, because beyond that your true marginal rate spikes. IRMAA, the Medicare premium surcharge, works as hard income cliffs with a two-year lookback, so conversions are planned to respect those thresholds rather than cross them unaware and trigger surcharges later.
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