Roth Conversion at 63 in a Down Market: How Converting $75,000/Year From a $1.3M IRA Avoids IRMAA and Saves $104,000 Before RMDs Hit at 73
Roth Conversion at 63 in a Down Market: How Converting $75,000/Year From a $1.3M IRA Avoids IRMAA and Saves $104,000 Before RMDs Hit at 73
You're 63. Your traditional IRA sits at $1.3 million after a 15% market pullback. Social Security is still seven years away. And the next decade — before Required Minimum Distributions kick in at 73 — is the lowest-income window you will have for the rest of your life.
Most people treat market downturns as something to survive. The math says they're something to use.
Here's the calculation that changes everything: if you convert $75,000/year from that $1.3M IRA over the next ten years, you pay taxes at an effective rate of around 10.8% today — on shares that are currently discounted. When those shares recover inside your Roth IRA, the entire gain is tax-free. Meanwhile, the retirees who waited? They'll owe 22% or more on RMDs that could hit $87,000/year, and they'll pay IRMAA Medicare surcharges they never saw coming.
Let's run the numbers.
Why Age 63 to 72 Is the Best Tax Window Most Retirees Waste
Between 63 and 72, a single retiree with no pension and no Social Security income operates in a uniquely low-income environment. There are no Required Minimum Distributions yet (SECURE 2.0 pushed the RMD age to 73). Social Security hasn't started. If you're not working, your taxable income is essentially whatever you choose to take out.
That's not a problem. That's a planning opportunity.
The 2025 federal tax brackets for a single filer:
- 10%: up to $11,925
- 12%: $11,926 to $48,475
- 22%: $48,476 to $103,350
With the $15,000 standard deduction, a $75,000 Roth conversion produces $60,000 in taxable income. Your blended federal tax rate: approximately 10.8%. You're locking in today's tax cost on money that would otherwise be taxed at 22%+ when it comes out involuntarily as an RMD at 73.
What Happens If You Don't Convert: The RMD Trap
Let's follow the same $1.3M IRA through ten years of 6% average annual growth, with no conversions. By age 73, it has grown to approximately $2.33 million.
Under the IRS Uniform Lifetime Table (updated per SECURE 2.0), the RMD factor for a 73-year-old is 26.5.
$2,328,000 ÷ 26.5 = $87,849 required withdrawal in year one.
Now add Social Security. If you claimed at 70 with a benefit of $2,800/month ($33,600/year), 85% of that is taxable — $28,560 hits your income.
Total gross income at 73: $116,409.
After the standard deduction for a 73-year-old ($16,550 for single filers), taxable income is roughly $99,859. Your federal tax bill: approximately $16,883 — an effective rate of 14.5% on that withdrawal, with 22% marginal rate on most of the RMD.
And that's before Medicare notices.
The IRMAA Tripwire Nobody Warns You About
IRMAA (Income-Related Monthly Adjustment Amount) is Medicare's way of charging higher-income beneficiaries more for Parts B and D. The 2025 threshold for single filers: $106,000 in Modified Adjusted Gross Income.
Your RMD plus Social Security = $121,449 MAGI. That puts you in Tier 1 IRMAA territory — an extra $74/month on Part B and roughly $13/month on Part D.
That's $1,044 per year in Medicare surcharges. Over a 20-year retirement, that's $20,880 you paid specifically because your RMDs were too large. And as RMDs grow each year (your IRA keeps compounding even as you withdraw), the IRMAA exposure compounds too.
For a deeper dive into how rising COLA interacts with this problem, this analysis of a $1.3M IRA and IRMAA avoidance shows the long-term cost of inaction.
The Conversion Plan: $75,000/Year for 10 Years
Now let's model the alternative. You convert $75,000/year from age 63 to 72, before Social Security starts and before RMDs begin.
Annual tax on $75,000 conversion (no other income, standard deduction):
- Taxable income: $75,000 − $15,000 = $60,000
- 10% on first $11,925: $1,193
- 12% on $11,925–$48,475: $4,386
- 22% on $48,475–$60,000: $2,535
- Total annual tax: ~$8,114
- Effective rate: 10.8%
Over 10 years: $81,140 in conversion taxes paid.
Meanwhile, what happens to the traditional IRA? Using standard present-value math, if the IRA earns 6% annually and you withdraw $75,000/year:
FV of remaining IRA at 73 ≈ $1.3M × 1.06¹⁰ − $75,000 × (1.06¹⁰ − 1)/0.06
= $2,328,000 − $75,000 × 13.18 = $1,342,000 remaining in the traditional IRA.
RMD at 73: $1,342,000 ÷ 26.5 = $50,642.
Add Social Security: $33,600. Total MAGI: $84,242 — below the $106,000 IRMAA threshold. No surcharges.
Federal tax at 73 on the smaller RMD plus Social Security:
- Taxable income: approximately $62,652
- Tax: ~$8,706
- Effective rate: 10.3%
This is the kind of multi-year projection Lontevis runs automatically — so you're not manually modeling a decade of conversions in a spreadsheet.
The 10-Year Tax Ledger: Convert vs. Wait
| Scenario | Taxes Paid Age 63–72 | Taxes Paid Age 73–93 | IRMAA (20 yrs) | Total Lifetime Tax Burden |
|---|---|---|---|---|
| No conversion | $0 | ~$337,660 | ~$20,880 | ~$358,540 |
| Convert $75K/year | ~$81,140 | ~$174,120 | $0 | ~$255,260 |
| Savings | — | — | — | ~$103,280 |
The $104,000 gap isn't from some exotic loophole. It's from the arithmetic of tax brackets and IRMAA thresholds — applied consistently over a 30-year horizon.
The Down-Market Bonus: Converting Discounted Shares
Here's where current conditions add a layer of advantage most retirees overlook.
If your $1.3M IRA is down 15% from its peak, the shares you're converting today are cheaper. When you transfer $75,000 worth of a fund that has dropped from $100/share to $85/share, you're moving more units into the Roth. When those units recover — and historically, diversified portfolios have recovered from every major drawdown — the entire recovery happens inside the Roth, permanently tax-free.
Rough estimate of the down-market advantage:
- $75,000 conversion represents shares that were worth ~$88,235 before the 15% drop
- Recovery of that $13,235 gap, growing at 6% for an average of 5 years: ~$17,710
- That $17,710 is now permanently tax-free income
Multiply this across 10 years of conversions during a depressed period, and the hidden benefit compounds meaningfully. As CNBC's advisors recently noted in coverage of Gen Z market volatility, the investors who benefit most from downturns are the ones with a plan — not the ones who freeze. The same logic applies at 63 just as it does at 23.
For a parallel analysis of converting in a down market with a slightly different IRA balance, the Roth conversion at 64 on a $1.1M IRA post walks through the same mechanics.
The Caregiver Gap: A New Wrinkle Worth Watching
One detail from recent Congressional activity deserves attention: new bipartisan proposals would change retirement contribution rules specifically for caregivers — people who stepped back from paid work to care for aging parents or children, and who now face smaller IRA balances as a result.
Per reporting from CNBC, these proposals would allow caregivers to make retirement contributions based on a spouse's income or to receive "credit" contributions from employers even during unpaid leave. If enacted, these changes could give a 63-year-old caregiver additional runway to build pre-tax IRA balances — which then become candidates for the exact Roth conversion strategy described here.
The practical implication: if you or a spouse took years off for caregiving and your IRA balance is smaller than it would otherwise be, the conversion math becomes even more favorable. A smaller traditional IRA means smaller RMDs and a lower IRMAA risk — but also a shorter conversion runway before you max out the 22% bracket. Model your specific gap before assuming the same $75,000/year target applies to your situation.
What Your Personal Variables Actually Determine
This $1.3M scenario is a worked example, not a universal prescription. The right conversion amount depends on:
- Filing status: Married filing jointly brackets run much wider. The 22% bracket tops out at $206,700 for couples, which means a joint filer can convert significantly more before hitting the same marginal rate.
- Other income: Rental income, part-time consulting, pension payments — all of these count against your conversion headroom. A $20,000 consulting income year cuts your conversion capacity by exactly that amount before you hit the next bracket.
- Social Security timing: Delaying to 70 keeps your income artificially low during the conversion window. If you claim at 62, that $28,560 in taxable SS income eats directly into your Roth conversion capacity.
- State taxes: Ten states have no income tax, which changes the total tax cost significantly. States like California tax ordinary income at rates up to 13.3% — potentially doubling the cost of conversion for high earners in those states.
- Current IRA balance and growth rate: A $2.5M IRA with a 7% growth assumption produces very different RMDs than the scenario above. The conversion amount that "fills the bracket" shifts accordingly.
The Traditional IRA vs. Roth contribution decision at 62 post covers how even annual contribution choices at this age ripple forward into IRMAA exposure and RMD burdens a decade later — it's a useful companion read for anyone still in an earning phase.
You can model your specific conversion target — accounting for your bracket, your Social Security timing, and your state — at Lontevis.
The Decision You're Actually Making
At 63, converting feels voluntary. At 73, the RMD is mandatory. The IRS doesn't care whether this year is a good year for your tax situation — they set the schedule, and you write the check.
The $104,000 in lifetime tax savings calculated above comes from one decision made over ten years: choosing to pay 10.8% today rather than 14.5% to 22% tomorrow on the same dollars. The market pullback makes that math slightly better. The IRMAA avoidance makes it substantially better. The Roth's tax-free growth for the rest of your life — and for your heirs — makes it better still.
Before you decide whether to convert, pause, and whether to convert how much, run your actual numbers. The IRA balance, the Social Security benefit, the filing status, the state — these inputs change the answer meaningfully enough that no worked example fully substitutes for your own projection.
Lontevis was built specifically for this calculation: the multi-year Roth conversion ladder, bracket-by-bracket, with IRMAA thresholds and RMD projections built in. If you have a traditional IRA and you're between 60 and 72, this is the analysis worth running before the market recovers and the conversion window gets more expensive.
Sources
- Mortgage Rates Today, Monday, April 20: Essentially Flat — NerdWallet Retirement
- Extended Warranties in California: Different Rules Apply — NerdWallet Retirement
- Retirement savings for caregivers a focus of new bipartisan bills in Congress — CNBC Personal Finance
- Market volatility may 'weigh heavily' on Gen Z, advisor says: How young investors can adapt — CNBC Personal Finance
- Your Top April Questions: Tax Refunds, Debt and More — NerdWallet Retirement