Tax Planning & Roth Conversion
How to Reduce Future RMDs with Roth Conversions Before Age 73
Every dollar you convert before age 73 is a dollar that will never become a Required Minimum Distribution. Here's how to calculate how much your RMDs will shrink — and why starting earlier matters more than most retirees realize.
What Are Required Minimum Distributions?
A Required Minimum Distribution (RMD) is the minimum amount the IRS requires you to withdraw from a traditional IRA (and most employer-sponsored retirement plans) each year starting at age 73, under the SECURE 2.0 Act. You cannot skip an RMD or roll it back into the account. It comes out, it counts as ordinary income, and you owe tax on it — regardless of whether you need the money.
Each year's RMD is calculated by dividing the prior year's December 31 account balance by a life expectancy factor from IRS Uniform Lifetime Tables. As your balance grows through investment returns, so does your RMD. A well-invested $1 million IRA at age 73 produces roughly a $36,000 mandatory distribution. By age 80, that same account (if grown) may require $50,000 or more to be distributed each year — all fully taxable.
Why Large RMDs Cause Problems
RMDs create a compounding tax problem that catches many retirees off guard:
- Higher bracket: Large RMDs push income into the 24%, 32%, or even 37% federal bracket for retirees with substantial traditional IRA balances.
- More Social Security taxed: Rising combined income causes a greater portion of Social Security benefits — up to 85% — to become taxable.
- IRMAA surcharges: Higher MAGI from RMDs can trigger increased Medicare Part B and Part D premiums in subsequent years.
- Investment account impact: Unwanted capital gains may be triggered if RMD proceeds are reinvested in taxable accounts.
How Roth Conversions Shrink Future RMDs
Every dollar you move from a traditional IRA to a Roth IRA reduces the balance used to calculate future RMDs. A couple with $800,000 in traditional IRA assets who converts $50,000 per year for eight years before age 73 would reduce their traditional IRA balance by roughly $400,000 (including growth foregone) — potentially cutting their annual RMD by 30–40% or more.
The Roth IRA has no RMDs during your lifetime. That same $400,000 (now growing inside the Roth) compounds tax-free and can be tapped selectively in retirement — or left entirely for heirs. The flexibility to choose when and whether to withdraw is itself a major financial benefit beyond the tax savings.
The Critical Rule: RMDs Cannot Be Converted
An important IRS rule that trips up many retirees: you cannot convert your RMD itself into a Roth IRA. The RMD must come out first — as a taxable distribution — and only additional traditional IRA funds above the RMD amount are eligible for conversion.
This rule makes early conversion (before RMDs begin at 73) dramatically more powerful than late conversion. Once RMDs start, you have already satisfied your annual distribution requirement before you can convert anything. In the years before 73, you have full control over conversion amounts with no mandatory distribution eating into your optimization.
The Pre-RMD Window Is Your Best Opportunity
The years between retiring and turning 73 — often ages 62 to 72 — are the prime window for strategic Roth conversions. During this period:
- Your employment income has stopped or dropped sharply
- RMDs have not yet begun
- Social Security may not yet have started (if you're delaying for larger benefits)
- Tax brackets are relatively low
- You have 5–10 years for Roth balances to grow tax-free before you might need them
This convergence of favorable conditions typically exists only once in a financial lifetime. Using it to convert aggressively — while staying within your target brackets and below IRMAA thresholds — can produce permanent, compounding tax savings for decades.
RMD Impact Calculator
See how much your Required Minimum Distributions shrink when you convert before age 73 — using IRS Uniform Lifetime Table factors.
| Age | RMD — No Conversion | RMD — With Conversions | Annual Savings |
|---|
Estimates use IRS Uniform Lifetime Table factors and assumed constant growth rate. Actual RMDs depend on year-end balances. For educational purposes only — not tax or financial advice.
NestBridge models your complete retirement picture — RMDs, Roth conversion impact, Social Security timing, and more — using your actual account data.
Impact on Inherited IRAs: Protecting Your Heirs
Under the SECURE Act's 10-year rule, most non-spouse beneficiaries must fully distribute inherited retirement accounts within ten years of the original owner's death. For an inherited traditional IRA, every dollar distributed is ordinary income — hitting heirs during what may be their own peak earning years.
By contrast, an inherited Roth IRA must also be distributed within ten years, but all distributions are entirely tax-free (assuming the five-year rule is satisfied). Converting your traditional IRA to a Roth during your lifetime is one of the most powerful gifts you can leave to heirs — you absorb the tax burden at your presumably lower rate so they don't have to pay it at theirs.
Key Takeaways
- RMDs begin at age 73 and create forced taxable income that can push retirees into higher brackets, increase Social Security taxation, and trigger Medicare IRMAA surcharges.
- Roth conversions before age 73 reduce the traditional IRA balance subject to RMD calculations.
- RMDs cannot be converted to a Roth — the distribution must happen first. Convert in the years before RMDs begin.
- The pre-RMD window (ages 62–72) is the best opportunity: income is lower, brackets are favorable, and conversions compound for a decade or more before you need them.
- Inherited Roth IRAs pass to heirs tax-free; inherited traditional IRAs generate taxable income during the 10-year distribution window.
Your Numbers Tell the Real Story
The calculator above uses general assumptions. NestBridge runs the same projection using your actual account balances, retirement age, Social Security plan, and spending goals — and shows you exactly how much your RMDs will be reduced by each dollar you convert today.
Run My Full Projection