There’s a narrow, powerful window in early retirement — typically between ages 60 and 72 — when your taxable income is often at its lowest point in decades.

Pensions haven’t started. Social Security hasn’t started. Required Minimum Distributions haven’t started. For the first time in 30 years, you have real control over how much taxable income you report.

This is the Roth conversion window. And most retirees miss it entirely.

A strategic Roth conversion during this window can reduce your lifetime tax bill by $50,000 to $200,000 or more, shrink your future RMD burden, protect your Social Security benefits from taxation, and leave tax-free money to your heirs.

This guide explains exactly how it works, when it makes sense, and how to integrate it with your Social Security timing, annuity income, and retirement income plan.

What Is a Roth Conversion?

A Roth conversion is the process of moving money from a traditional IRA (or 401(k), 403(b), SEP IRA, or SIMPLE IRA) into a Roth IRA.

The converted amount is added to your taxable income in the year of conversion — you pay the tax now. In exchange, the converted funds grow tax-free in the Roth IRA and come out tax-free in retirement, including all future earnings.

Unlike a regular Roth contribution (which has income limits and a $7,000 annual cap in 2026), Roth conversions have no income limit and no dollar cap. You can convert as much as you want, at any age.

Why the Early Retirement Window Is So Valuable

The math of Roth conversion is a comparison: paying tax now vs. paying tax later.

The conversion makes sense when your current tax rate is lower than your expected future tax rate.

Why Tax Rates Are Often Lower in Early Retirement

Phase 1 (Ages 60–62): If you’ve left work but haven’t yet claimed Social Security or started RMDs, your income may consist of only modest investment income, savings withdrawals, or a small part-time income. Many retirees find themselves in the 12% or even 0% effective federal tax bracket during this phase.

Phase 2 (Ages 63–72): Even after Social Security starts, you may have several years before RMDs kick in (now required at age 73). Partial conversions in this window — filling up the 12% or 22% bracket — can be very efficient.

Phase 3 (Ages 73+): RMDs begin. If your IRA is large, these required withdrawals push you into higher brackets, trigger more Social Security taxation, potentially trigger Medicare IRMAA surcharges, and compound into a larger estate tax problem. By this point, the window has largely closed.

The goal is to pay tax at today’s lower rate rather than tomorrow’s higher rate.

The Tax Bracket Stacking Strategy

The most precise Roth conversion approach is bracket stacking — converting just enough each year to fill up your current tax bracket without crossing into the next one.

2026 Federal Tax Brackets (Married Filing Jointly, approximate)

Taxable Income	Marginal Rate
$0 – $23,850	10%
$23,850 – $96,950	12%
$96,950 – $206,700	22%
$206,700 – $394,600	24%
$394,600 – $501,050	32%
$501,050 – $751,600	35%
Over $751,600	37%

(Exact thresholds indexed annually. Single filer thresholds are approximately half these amounts.)

The strategy: If your current taxable income (before conversion) is $45,000 and you’re married filing jointly, you’re in the 12% bracket and have room for another $51,950 of income before hitting 22%. Converting $51,950 from your IRA to your Roth fills that space at 12%.

Repeat this process for 5-10 years, and you can move a substantial portion of your IRA to tax-free status at a very low cost.

The RMD Problem (And How Roth Conversions Fix It)

Traditional IRA balances are a future tax liability. The IRS doesn’t let you hold that money forever — at age 73, Required Minimum Distributions begin, forcing you to withdraw and pay taxes on a percentage of your account each year whether you need the money or not.

RMD Amounts Grow Over Time

The RMD percentage starts at about 3.77% at age 73 and increases each year. On a $1,000,000 IRA:

Age	RMD Percentage	RMD Amount
73	3.77%	$37,700
75	4.07%	$40,700
80	4.95%	$49,500
85	6.25%	$62,500
90	8.20%	$82,000

If your IRA grows faster than your RMDs, the withdrawals accelerate your tax problem even as you’re taking money out. By age 85 or 90, RMDs from a large IRA can push retirees into the 24%, 32%, or higher brackets — especially if paired with Social Security and other income.

Roth conversions before age 73 reduce the IRA balance that’s subject to RMDs, permanently lowering your future forced income.

Here’s a specific way Roth conversions protect your Social Security benefits.

Up to 85% of your Social Security benefits are taxable if your “provisional income” (adjusted gross income + tax-exempt interest + half your SS benefit) exceeds certain thresholds.

2026 Provisional Income Thresholds (MFJ)

Provisional Income	SS Benefits Subject to Tax
Under $32,000	0%
$32,000 – $44,000	Up to 50%
Over $44,000	Up to 85%

A large RMD in retirement can push your provisional income over $44,000, causing 85% of your Social Security to become taxable — a phenomenon called the “tax torpedo.”

By converting IRA funds to Roth before age 73, you reduce future RMDs, which reduces future provisional income, which may keep more of your Social Security benefit tax-free.

Example: A married couple has $800,000 in a traditional IRA. At 75, their RMD is approximately $33,600. Combined with $48,000 in Social Security ($24K each), their provisional income is $57,600 — putting 85% of their Social Security benefits into taxable income, adding approximately $15,300 in additional taxes.

If they had converted $300,000 over the prior decade and reduced the IRA to $500,000, the RMD drops to ~$21,000, provisional income drops to $45,000, and substantially less of their Social Security is taxed.

Medicare IRMAA: The Hidden Tax on Conversions

One timing consideration: Roth conversions increase your modified adjusted gross income in the year of conversion, which affects Medicare premiums two years later.

Medicare IRMAA (Income-Related Monthly Adjustment Amount) surcharges apply to Part B and Part D premiums when income exceeds:

$212,000 MFJ (2026 approximate): +$69.90/month per person in Part B surcharges
$266,000 MFJ: +$174.70/month per person
Higher thresholds add progressively more

A very large Roth conversion in a single year could push you into an IRMAA tier two years later. The solution is to spread conversions across multiple years and stay below the IRMAA thresholds — one more reason to plan carefully rather than converting all at once.

Roth Conversions vs. IUL: Complementary Strategies

Some clients ask about Indexed Universal Life (IUL) insurance as an alternative to Roth conversions for tax-free retirement income.

Both strategies produce tax-free income — but through different mechanisms:

	Roth Conversion	IUL
Tax treatment	Pay tax on conversion; growth and withdrawals tax-free	Premiums paid with after-tax dollars; cash value grows tax-deferred; loans tax-free
Income limits	None	None
Contribution limits	No annual cap	Based on policy face amount
Investment risk	Subject to market risk (unless held in stable assets)	Floor protection (0% minimum credit in most policies)
Withdrawal flexibility	5-year rule applies to converted funds before 59½	Policy loans available at any age
Death benefit	None	Includes life insurance death benefit
Best for	Existing IRA balances, RMD management	Ongoing contributions, insurance need, supplemental income

Many retirees benefit from both: converting existing IRA balances to Roth while using an IUL for new premium dollars that don’t have a pre-existing tax obligation.

Roth Conversions and Annuity Income Planning

If you’re considering a Fixed Index Annuity (FIA) with a GLWB income rider as part of your retirement income plan, Roth conversions interact in an important way.

An FIA held inside an IRA (a “qualified annuity”) still triggers RMDs at age 73. Converting those funds to a Roth IRA before purchasing the annuity — or purchasing the annuity with after-tax (non-qualified) money — keeps the income stream permanently tax-free.

The ideal structure:

Convert a portion of IRA funds to Roth during the early retirement window
Allocate Roth IRA funds to a Fixed Index Annuity with income rider
At income activation, receive guaranteed lifetime income that is 100% tax-free

This structure produces predictable, inflation-linked, tax-free income for life — one of the most tax-efficient retirement income strategies available.

How Much Should You Convert Each Year?

The right conversion amount depends on your specific situation, but here are the general principles:

Convert up to — but not over — the top of your current bracket. The most common strategy is filling up to the top of the 12% or 22% bracket each year.

Watch the IRMAA thresholds. If you’re on Medicare, keep conversions below the first IRMAA threshold unless the long-term tax savings clearly outweigh the short-term premium surcharge.

Model the RMD future. Run projections showing what your RMDs will look like at 73, 80, and 85 with and without conversions. The tax savings at 80 may justify the tax cost today.

Account for state taxes. Oregon taxes all retirement income at ordinary income rates (up to 9.9%). Roth conversions in Oregon are taxed at these rates, which affects the math compared to states with no income tax.

Don’t convert so much that it triggers a tax bracket you weren’t in. The incremental dollar converted at 32% when you could have stayed at 22% is a mistake.

The Deadline Nobody Talks About: RMD Year

Technically, you can do Roth conversions at any age. But the practical deadline is the year you turn 73 — once RMDs begin, you must take your RMD first, and you cannot convert that RMD amount to Roth. Conversions from the remaining balance are still allowed, but you lose the ability to convert tax-free the RMD portion.

The final high-value conversion window is approximately ages 60–72. If you’re in that range now and haven’t started a systematic Roth conversion strategy, every year of delay is a missed opportunity.

The Bottom Line

Roth conversions aren’t for everyone. They require:

A meaningful traditional IRA balance
Current income below what you expect in the future
Cash available to pay the conversion taxes (ideally from non-IRA funds)
A planning horizon of at least 10-15 years

But for retirees who check those boxes — and many do — a systematic Roth conversion strategy during the early retirement window is one of the most powerful tax-reduction moves available.

The strategy requires no extraordinary risk, no complex financial products, and no special government approval. It simply requires planning.

Schedule a 30-Minute Retirement Tax Strategy Review →

We’ll review your IRA balance, current income picture, projected RMDs, and Social Security timing to identify whether a Roth conversion strategy makes sense — and if so, how to structure it.

Rodney Cummings, RSSA® | Legacy Wealth Services | Oregon Insurance License #18847712 | 503-832-8555

Tax laws are subject to change. This article reflects 2026 tax law as of the publication date. This is educational information, not tax or legal advice. Consult a qualified tax professional before implementing any Roth conversion strategy. Tax bracket thresholds and IRMAA surcharge amounts are approximate and may be adjusted annually by the IRS and CMS.