Author: Jerry Kutche

For a lot of people, there’s a stretch of a few years in early retirement where taxable income is unusually low — after the paycheck stops, but before Social Security and Required Minimum Distributions start. This window gets far less attention than it deserves, because for many people it’s the lowest tax bracket they’ll be in for the rest of their life, and it doesn’t last.

Why the window exists: a working paycheck is gone, so is one major source of taxable income. Social Security often isn’t claimed yet if you’re aiming to delay it (see the earlier post on claiming timing). RMDs don’t start until your specific required age. In between, your only taxable income might be modest — interest, dividends, part-time work, or nothing much at all — which can genuinely put you in the lowest tax bracket you’ll see for years.

The most common way this window gets used: Roth conversions. Converting money from a traditional IRA/401(k) to a Roth account means paying ordinary income tax on the converted amount now, in exchange for that money (and all its future growth) being completely tax-free later, with no RMDs ever required on it in your lifetime. Doing conversions specifically during a low-income year means paying tax on that conversion at a lower rate than you likely would later, once Social Security and RMDs are both adding to your taxable income at the same time.

Why “fill the bracket” is the common strategy, not “convert everything”: converting a large amount all at once can push you into a much higher bracket for that single year, potentially eliminating the advantage entirely. The typical approach is converting just enough each year to use up the room remaining in your current, lower tax bracket — effectively “filling it up” without spilling into the next one — repeated across each year of the window.

This window interacts directly with two other decisions already covered:

• ACA subsidies: if you’re bridging to Medicare via the ACA marketplace, a Roth conversion adds to your taxable income for that year, which can reduce your premium subsidy. The conversion might still be worth it, but the two decisions have to be modeled together, not separately.
• Future RMDs: every dollar converted to Roth during this window is a dollar that won’t generate a future required distribution — meaning conversions now can directly shrink a future RMD problem, particularly useful if your traditional-account balance is large enough that future RMDs alone would push you into a high bracket regardless of anything else.

Why this window is easy to miss entirely: because nothing forces you to act during it. There’s no notice, no deadline reminder, no default option that happens automatically — it just quietly opens and closes based on the gap between when you stopped working and when Social Security/RMDs start. Once Social Security and RMDs are both flowing, the window is gone for good; there’s no way to go back and use it retroactively.

Whether this is worth doing, and how much to convert each year, depends heavily on your specific tax situation, so it’s genuinely worth running past a CPA or fee-only advisor with your real numbers rather than a generic example — but knowing this window exists at all is the part most people miss entirely.

Once you hit a certain age, the IRS stops letting your traditional retirement accounts grow tax-deferred forever — you’re required to start withdrawing a minimum amount each year, whether you need the money or not. These are Required Minimum Distributions (RMDs), and the rules around them have changed more than once in recent years, which is exactly why outdated advice about them is so common.

The age itself has moved. It used to be 70½, then 72, and current law has it at 73 (scheduled to move to 75 for people born in 1960 or later, under current law — though tax law in this area has changed before and could change again). The starting age depends entirely on your birth year, so don’t assume a number you read somewhere still applies to your specific situation without checking current rules.

Which accounts are actually subject to RMDs: traditional IRAs, SEP and SIMPLE IRAs, and traditional 401(k)/403(b) plans. Roth IRAs are not subject to RMDs during the original owner’s lifetime — one of the real, lasting advantages of Roth accounts. Roth 401(k)s used to require RMDs (a quirk that surprised a lot of people), but recent law changed that too, aligning them with Roth IRAs.

How the amount is actually calculated: your RMD isn’t an arbitrary number — it’s your account balance as of December 31 of the prior year, divided by a life expectancy factor from an IRS table that changes each year as you age. Multiple traditional IRAs can be combined and withdrawn from any one (or combination) of them to satisfy the total RMD, but 401(k)s generally each require their own separate RMD calculation and withdrawal unless specific rules allow otherwise.

The penalty for missing one is real, but it’s smaller than it used to be. The excise tax for a missed or shortfall RMD was cut from 50% to 25% of the amount not withdrawn under recent law, and can drop further to 10% if you correct the mistake within a defined correction window. That’s still a meaningful penalty on money that was supposed to come out anyway — and unlike some tax situations, “I didn’t know” doesn’t exempt you from it, though the IRS does have a process to request a full waiver for a genuine, reasonable-cause error, corrected promptly.

The first-year exception that trips people up: you technically have until April 1 of the year after you turn RMD age to take your first RMD. That sounds like extra flexibility, but taking that option means you’ll owe two RMDs in that following calendar year (the delayed one plus that year’s regular one) — which can push you into a meaningfully higher tax bracket for that single year. Running the numbers on whether delaying actually helps, rather than assuming it automatically does, is worth the time before deciding.

The planning angle worth knowing: if you’re doing Roth conversions in the years before RMD age specifically to shrink your future RMDs (a strategy worth its own separate discussion), the RMD calculation only cares about your traditional-account balance as of the prior year-end — so the timing and size of conversions in earlier years directly determines how large your eventual RMDs will be.

Medicare enrollment gets talked about like a single event — “sign up when you turn 65” — but it’s actually a set of separate deadlines, some of which carry permanent financial penalties if missed, and some of which don’t apply to you at all depending on your situation. Getting the distinction wrong is one of the more expensive mistakes people make in this transition.

The Initial Enrollment Period (IEP) runs 7 months: starting 3 months before your 65th birthday month, including your birthday month, and ending 3 months after. This is your first real window to sign up for Medicare Part A (hospital) and Part B (medical).

The penalty that actually bites: Part B late enrollment. If you don’t sign up for Part B during your IEP and don’t qualify for a Special Enrollment Period (see below), you’ll pay a penalty of 10% of the standard premium for every full 12-month period you were eligible but didn’t enroll — and this penalty is permanent, added to your premium for as long as you have Part B. This is the single most consequential Medicare deadline to understand correctly.

The exception that saves a lot of people: still working with employer coverage. If you (or your spouse) are still actively working at 65 and covered by a qualifying employer group health plan (generally, an employer with 20+ employees), you can delay Part B without penalty. Once that employment or coverage ends, you get an 8-month Special Enrollment Period to sign up for Part B penalty-free. The mistake people make here is assuming COBRA or retiree coverage counts as “still covered” for this purpose — it generally does not. Missing that distinction is exactly how people accidentally trigger the penalty.

Part D (prescription drug coverage) has its own, separate late penalty — roughly 1% of the national base premium for every month you went without Part D or other “creditable” drug coverage after your IEP, also permanent. Even if you don’t take any prescriptions right now, going without any creditable drug coverage still starts that penalty clock.

Medigap has a use-it-or-lose-it window that’s different from all of the above. You get a one-time, 6-month Medigap Open Enrollment Period starting when you’re both 65+ and enrolled in Part B, during which insurers can’t deny you a policy or charge more based on health conditions. Miss that window, and in most states insurers can medically underwrite you for a Medigap policy later — meaning a real pre-existing condition could get you denied or priced much higher.

The practical takeaway: the deadline that matters most for you depends entirely on whether you’re still working with real employer coverage at 65, not just your birthday. Before assuming you’re fine to wait, confirm specifically whether your current coverage counts as “creditable” and qualifies you for a Special Enrollment Period later — that one detail determines whether delaying costs you a permanent penalty or costs you nothing at all.

For most of a working life, taxes just happen — your employer withholds federal and state tax from every paycheck, and unless something unusual happens, you’re roughly square with the IRS by April. Retirement quietly removes that safety net, and it catches a lot of people off guard the first year.

None of your retirement income sources withhold tax automatically by default. Social Security, pension payments, and IRA/401(k) distributions can all have tax withheld — but only if you actively request it. Skip that step, and you could owe a large lump sum (plus potentially an underpayment penalty) the following April, even though you technically had the income spread across the whole year.

How to actually set up withholding on each source:

• Social Security: Use Form W-4V (Voluntary Withholding Request). You can choose 7%, 10%, 12%, or 22% of your monthly benefit to be withheld for federal tax — there’s no option for a custom percentage or a flat dollar amount, only those four choices. Submit it to your local Social Security office or by mail; it typically takes a payment cycle or two to take effect.
• Pensions: Handled similarly to a W-4 with your former employer’s pension administrator — you can usually choose a specific dollar amount or percentage, and most administrators let you update it at any time during the year, not just at enrollment.
• IRA and 401(k) distributions: The custodian (the brokerage or plan administrator) will typically default to a flat 10% federal withholding on distributions unless you specify otherwise — you can adjust that percentage, request a specific dollar amount, or opt out entirely and pay estimated quarterly taxes instead.

Roughly how much to withhold depends entirely on your total expected income for the year across all sources combined — Social Security, pensions, distributions, any part-time work, and investment income — since your tax bracket is determined by the total, not any single source in isolation. A common starting approach is to add up your projected total income, estimate the tax bracket that puts you in, and set withholding percentages across sources aiming to land close to (not under, if you want to avoid a bill) your actual expected liability. This is exactly the kind of calculation worth running past a CPA at least once, since getting it meaningfully wrong in either direction has real consequences — overpaying ties up cash you didn’t need to give up early, underpaying risks a penalty.

The other option: quarterly estimated payments. If you’d rather not withhold from any individual source, the IRS lets you pay estimated taxes directly four times a year instead. This gives you more control over cash flow but requires actually staying on top of the quarterly deadlines — missing one can trigger the same kind of underpayment penalty that skipping withholding altogether would.

The core lesson: retirement income doesn’t opt you out of paying tax throughout the year, it just removes the automatic mechanism that used to do it for you. Replacing that mechanism deliberately — rather than discovering the gap at tax time — is one of the more overlooked parts of a smooth first year of retirement.

Medicare eligibility starts at 65. If you’re retiring earlier than that — which a lot of people do, whether by choice or circumstance — you have a real gap to cover, and it’s one of the most consequential and least talked-about parts of an early retirement plan.

The ACA marketplace is the standard bridge. Once you leave employer coverage, you qualify for a Special Enrollment Period to sign up for an ACA marketplace plan without waiting for the annual open enrollment window. Plans are categorized by metal tier (Bronze, Silver, Gold, Platinum) reflecting the tradeoff between monthly premium and out-of-pocket costs when you actually use care — Bronze has the lowest premium and highest deductible, Platinum the reverse.

The part that catches people off guard: subsidies are based on estimated annual income, not net worth. This means someone with substantial retirement savings but low reportable taxable income in a given year can qualify for significant premium subsidies — while someone drawing a large taxable IRA distribution that same year might not. This creates a real, actionable planning lever: how you structure your income in the years before Medicare (which accounts you draw from, whether you do Roth conversions that year, whether you delay a large withdrawal) directly changes what you pay for health coverage.

A few things worth knowing before you’re in the middle of it:

• Re-enrollment isn’t automatic in the way people assume. Even if you’re staying on a similar plan, actively re-confirming your enrollment and updated income estimate during the open enrollment window (typically November 1) matters — an outdated income estimate from last year can result in either an underpriced plan you’ll owe money back on at tax time, or an overpriced one you didn’t need to pay.
• The “subsidy cliff” isn’t as sharp as it used to be, but it still exists in some form depending on current law. Rules around the income thresholds for subsidy eligibility have changed multiple times in recent years — always check the current-year rules rather than relying on what you remember from a prior year.
• Effective date timing matters. Coverage doesn’t necessarily start the day you sign up — plan the gap carefully around your actual last day of employer coverage so there’s no lapse, especially if you have ongoing prescriptions or scheduled care.
• Keep your income estimate realistic, not optimistic. Underestimating your income to get a bigger subsidy doesn’t actually help — it gets reconciled against your actual tax return, and a big gap between estimate and reality means owing money back (or being owed more) when you file.

The ACA bridge isn’t complicated once you understand the income-based subsidy mechanic, but it does mean the years before Medicare eligibility deserve real income planning, not just health-plan shopping. The two are the same decision.

Almost every retirement article says the same thing: “wait as long as you can to claim Social Security.” That’s true as a rule of thumb, but it skips the actual tradeoffs that make this decision harder in real life than it sounds on paper.

The mechanics, quickly: claim at 62 (the earliest age) and your monthly benefit is permanently reduced — typically around 25-30% lower than your full amount, depending on your exact birth year. Claim at your Full Retirement Age (FRA, currently 66-67 depending on birth year) and you get 100% of your calculated benefit. Wait until 70 and you get delayed retirement credits, boosting your benefit roughly 8% for every year past FRA — up to about 24-32% more than your FRA amount. After 70, there’s no further benefit to waiting; that’s the ceiling.

Where the generic advice breaks down:

• Health and family longevity matter more than the math suggests. The “wait until 70” math assumes you’ll live long enough for the higher monthly checks to outpace what you’d have collected by claiming earlier. The typical break-even point is around age 80-82 — if you have real reasons to expect a shorter lifespan (family history, existing health conditions), claiming earlier can come out ahead in total dollars received, even though the monthly amount is smaller.
• If you’re still working, early claiming can get clawed back. Claim before FRA while still earning wages above the annual earnings limit, and Social Security withholds $1 in benefits for every $2 you earn over that limit. It’s not lost forever — your benefit gets recalculated upward once you hit FRA — but it changes the near-term cash flow math significantly if you’re not actually retired yet.
• Spousal and survivor benefits change the calculation. If one spouse earned significantly more, that spouse delaying their claim to 70 can meaningfully increase the surviving spouse’s benefit for the rest of their life after the higher earner passes — a factor that’s easy to miss when only looking at one person’s individual break-even age.
• Bridging the gap before Medicare matters just as much as the SS decision. If you’re retiring before 65, you need health coverage in the meantime — ACA marketplace plans are the common bridge, and their subsidies are income-based, which means how much Social Security (and other income) you’re drawing during those bridge years directly affects your marketplace subsidy eligibility. The two decisions aren’t actually separate.

A more useful question than “when should I claim”: what does your actual cash flow look like in each scenario, accounting for other income, health coverage costs before Medicare, and your realistic health outlook — not just the theoretical break-even age Social Security’s own calculators show you. Running the numbers with your specific numbers (not a generic example) is worth the hour it takes, ideally with a second opinion from a fee-only financial advisor who doesn’t earn a commission either way.