Why the Lowest-Income Years of Your Retirement Are the Most Valuable

Would you rather pay tax on the seed or on the harvest?

Almost everyone picks the seed. Pay a known amount now on a smaller number, and let the rest grow untouched. 

But if you’re like most people approaching retirement, the bulk of your money sits in a 401(k) or traditional IRA, which is the harvest. Decades of deferred dollars, invested and compounding into a tax bill that has grown right alongside the balance.

After you retire, though, you may have a window to address that deferred tax bill on your own terms. No W-2, no forced withdrawals, often no Social Security yet. Your return looks nothing like the ones you’ve been filing for decades — and that’s what makes it useful.

It’s likely the lowest your taxable income has been since your twenties, and it’s open for a limited time. 

What Is the Early Retirement Window?

The early retirement window is the stretch between your last paycheck and the point when income sources stack back up on your tax return.

It opens the moment W-2 income stops, and it narrows when any of the following switches on:

• Required minimum distributions (RMDs), which begin at 73 and move to 75 for anyone born in 1960 or later
• Social Security benefits, once you claim
• A pension, once payments start
• Deferred compensation, which for many corporate retirees is based on a fixed payout schedule set years prior

Each income source that switches on reduces the available room for tax planning. The more of them that run simultaneously, the less flexibility you have to work with.

How long the window stays open is personal. Retire at 65 and delay Social Security to 70 and you may have a decade of planning opportunities. Retire at 65 and claim at 66 and you’re down to a year or two. Retire at 62 and claim immediately and the window barely opens at all. Knowing when yours opens, what closes it, and how wide it actually is — that’s the first piece of early retirement tax planning.

FYI: If you’re planning to leave before 59½, the 10% early withdrawal penalty adds a wrinkle to how you access tax-deferred accounts, though workarounds like the rule of 55 and substantially equal periodic payments are possible. We covered those mechanics in more depth in Can You Retire Earlier Than You Think? 

Why These Years Can Be Worth More Than Your Peak Earning Years

Tax rates follow income, so when income bottoms out, the price of recognizing more of it drops right along with it. 

Your instinct in the first year of retirement may be to keep reported income as close to zero as possible. Live off the cash reserve, leave the accounts alone, and enjoy a refreshingly small April bill. It feels like restraint — and exercising some restraint is smart — but minimizing this year’s tax bill at the expense of the next twenty-five is a trade most people make without realizing they’re making it.

A better yardstick is your lifetime effective tax rate: the average rate you’ll pay across every remaining year of retirement. Once you know yours, each year becomes a straightforward comparison. Any year you can recognize income below that rate, you’re likely “buying at a discount.” Any year above it, you’re likely overpaying.

Filling the Lower Brackets on Purpose

In 2026, a married couple filing jointly with up to $100,800 of taxable income stays in the 12% bracket.¹ Add the $32,200 standard deduction, the extra standard deduction for filers 65 and older, and the new $6,000-per-person senior deduction available through 2028, and a retired couple can report roughly $148,000 in gross income before a single dollar gets taxed above 12%.

Many retirees use a fraction of that room in any given year, and whatever goes unused disappears on December 31.

Note that the $6,000 senior deduction begins to phase out above $150,000 in modified adjusted gross income for joint filers — a threshold some early retirees with pension income or deferred compensation distributions may exceed.

How Roth Conversions Work Inside the Window

A Roth conversion moves money from a traditional IRA into a Roth IRA. You pay ordinary income tax on the converted amount in the year you convert. After that, the money grows tax-free, comes out tax-free, and involves no RMDs for the rest of your life.

Converting at 22% to avoid 24% later barely moves the needle. Converting at 12% during a decade when your only income is a modest pension, years before Social Security starts and before RMDs force your hand, is where the math starts to change the shape of your retirement.

The same married couple mentioned above who retire at 65 can leverage 10 years’ worth of annual conversions sized to fill the lower brackets until they take RMDs at 75. 

Think of it as tax insurance. A modest premium now against a much larger assessment later.

A few things are worth keeping an eye on as you go:

1. Watch your MAGI. Once you’re 65, conversions raise modified adjusted gross income, and IRMAA surcharges attach to Medicare Parts B and D above $218,000 for joint filers in 2026.² The thresholds work as cliffs rather than slopes, so a single dollar over the line triggers the full tier. Medicare also looks back two years, which means a conversion this year shows up on a premium notice in 2028.
2. Conversions are permanent. Recharacterization went away in 2018, so there’s no undoing a conversion that turns out larger than it should have been. It’s a good reason to convert deliberately and revisit the amount each year.
3. Consider paying the tax from outside the IRA. Withholding from the conversion itself reduces the amount that gets to grow tax-free, and for anyone under 59½, the withheld portion may be treated as a distribution subject to that 10% penalty.

The health insurance complication: If you retire before 65, everything above collides with health insurance until you can enroll in Medicare. The enhanced Affordable Care Act premium tax credits expired at the end of 2025, and in 2026 marketplace credits cut off for households earning above 400% of the federal poverty line.³ Which means a Roth conversion that looks brilliant on a tax projection can be a net loss once you account for what it does to your premiums. 

The 0% Capital Gains Rate Retirees May Overlook

Long-term capital gains have their own bracket structure, and the bottom rung is zero.

For 2026, a married couple filing jointly whose total taxable income lands at or below $98,900 owes nothing federally on long-term capital gains.⁴ That’s taxable income measured after deductions, which means gross income can run considerably higher and still land inside it.

For someone who spent a career at a large public company, this is where it gets interesting. If you’re holding concentrated employer stock that has grown into an uncomfortable share of your portfolio, and you’ve been putting off selling because of what the tax hit would look like, the early retirement window is the least expensive stretch you’ll ever have to unwind it. Sell, recognize the gain, and repurchase into something diversified at a fresh cost basis.

Coordinate this one with an advisor, though. Minnesota taxes capital gains as ordinary income, so 0% federal doesn’t mean 0% total. The gain itself also counts toward the threshold, which means a sale that’s too large will push you past the line you were trying to stay under.

There’s one more wrinkle worth understanding. Roth conversions and capital gains harvesting draw from the same pool of bracket space. Convert $60,000 this year, and that’s $60,000 less room available for tax-free gains. You can generally do one or the other in a given year, or a measured amount of each, but not a full helping of both. 

Which one to prioritize depends on your balances, your timeline, and what the market has done, and the answer can change from year to year. In a down year, tax-loss harvesting in your taxable brokerage account can offset realized gains and free up space for a larger conversion.

What It Costs to Sleep Through the Window

Playing it ultra-safe and deferring every investment and tax decision until the accounts have to be dealt with can be costly. Here’s why:

Inflation compounds against you. An $84,000 lifestyle costs about $97,000 in five years, $112,000 in ten, and $151,000 in twenty. Social Security’s cost-of-living adjustment grows the benefit each year, but it’s indexed to general inflation — not the healthcare-heavy spending that’s common in later retirement. A fixed pension never moves at all. So as the cost of maintaining your lifestyle compounds upward, the gap that portfolio withdrawals have to cover widens.

RMDs take the decision away from you. The IRS formula pulls an ever-larger percentage from an ever-larger balance, taxed as ordinary income. As RMDs compound on a growing balance, effective rates tend to drift upward through the 70s and 80s — a trajectory that’s hard to see coming if you’re only looking at this year’s return.

Then there’s the widow’s penalty. Many retirement plans are modeled as though both spouses live to the same age and depart at the same time, just like the movies. Life doesn’t cooperate, unfortunately. When one spouse passes, the tax picture often shifts sharply. The IRA doesn’t shrink, and depending on the pension election made at retirement, some or all of that income may continue — but the survivor now files single against brackets roughly half as wide as before. Social Security steps down to the higher of the two benefits, not both. Effective rates can jump several percentage points overnight, IRMAA tiers along with them, and the surviving spouse has to manage that difference for the rest of their life.

Fortunately, these are manageable planning problems, if addressed far enough in advance.

A Good First Step

Start by evaluating your lifetime effective tax rate, instead of just this year’s.

That means projecting the average rate you’ll pay across your full retirement, run all the way through RMDs and through the survivor scenario. It’s typically not a number most people can pull together on their own — and that’s not a knock on anyone’s spreadsheet skills. This is the kind of work an advisor should be doing alongside you each year.

Once you have it, the rest becomes math you can actually act on: how much to convert, how much in gains to harvest, when to claim, and what it does to your premiums two years out. Later, once you’re past 70½, qualified charitable distributions become another lever for trimming RMD income if you’re charitably inclined.

Make the Most of the Years You Control

Your early retirement window opens once and closes on a timetable the IRS set, not one you negotiate. Every year that passes unused is bracket space that expires for good.

If you’re within a few years of retiring, or already there and wondering whether you’ve been leaving money on the table, we can model what the next decade looks like on paper. Schedule a free consultation.

¹ Internal Revenue Service, “IRS releases tax inflation adjustments for tax year 2026”

² Centers for Medicare & Medicaid Services, “2026 Medicare Parts A & B Premiums and Deductibles”

³ KFF, “What We Know So Far About 2026 ACA Marketplace Enrollment, Premiums, and Deductibles“

⁴ Fidelity, “2025 and 2026 capital gains tax rates,”