Many people assume that if you want to convert your Traditional IRA, 401(k), or TSP to a Roth IRA, 401(k), or TSP, you must do it all at once. But that’s a myth—and a costly one.
You don’t have to convert the entire IRA, 401(k), or TSP in a single year. In fact, doing so could push you into a much higher tax bracket and trigger other income-based costs (like Medicare surcharges). A smarter, more flexible option is using annual partial Roth conversions, which allow you to spread the tax impact over multiple years.
This strategy can reduce your long-term tax burden, give you more control over your income in retirement, and help you leave a more tax-efficient legacy.
What Is a Roth IRA Conversion?
A Roth conversion moves funds from a Traditional asset (pre-tax) into a Roth asset (after-tax). The converted amount is taxed as ordinary income in the year it’s moved. By converting your assets gradually—year by year—you can manage your tax bracket, reduce required minimum distributions (RMDs), and unlock the power of tax-free retirement income.
You can convert any amount you choose each year—whether it’s $5,000 or $95,000. This flexibility is what makes partial conversions such a powerful planning tool.
Why Choose Partial Conversions?
Instead of a single large tax hit, partial conversions allow you to:
- Control your tax bracket: Convert just enough each year to avoid higher marginal tax rates.
- Reduce future RMDs: Less money in your Traditional assets means smaller RMDs later.
- Leave more to heirs: Roth assets don’t have RMDs during your lifetime and offer tax-free inheritance.
- Plan around tax law changes: Convert at lower current tax rates if you expect future increases.
Let’s walk through what this strategy is, why it works, and real-world examples of how people are using it.
Example 1: Early Retiree in a Low Tax Bracket
Profile:
- Age: 60
- Recently retired with no earned income
- Traditional assets: $400,000
- Filing: Married Filing Jointly
Strategy:
With a low-income year, they can convert up to ~$90,000 and still stay in the 12% federal bracket after standard deductions.
Plan:
- Convert $90,000 annually for 4–5 years
- Pay ~$10,800/year in taxes (12%)
- Gradually shift to tax-free Roth assets
- Avoid higher RMDs starting at age 73
Example 2: Working Professional Using Upper Bracket Limit
Profile:
- Age: 50
- Income: $140,000
- Filing: Single
- Traditional assets: $300,000
Strategy:
Wants to convert just enough to stay in the 24% tax bracket without hitting the 32% threshold.
Plan:
- Convert ~$50,000 Traditional assets each year
- Pay ~$12,000 in tax annually
- Spread conversions over 5–6 years
- Build tax-free Roth assets while still working
Example 3: Widow Managing RMDs & Legacy
Profile:
- Age: 72
- RMD: $23,000
- Other income: $30,000
- Traditional assets: $600,000
Strategy:
She begins RMDs but also converts an additional $50,000/year to reduce future RMD growth and potential taxes for heirs.
Plan:
- Total income ~ $103,000/year
- Stay within the 22% bracket
- Lower future Traditional asset balance and RMDs
- Increase Roth assets for tax-free inheritance
Other Key Considerations
- Medicare IRMAA thresholds (starts at $109K for singles / $218K for MFJ in 2026)
- Affordable Care Act subsidies may be affected by increased income
- Five-year rule: Each Roth conversion must sit for five years before earnings can be withdrawn tax-free
- State taxes may also apply depending on your residency
Partial Roth IRA conversions allow you to smooth out your tax liabilities while building up tax-free retirement assets. The flexibility to manage the timing and size of each conversion puts you in control—not the IRS.
But every situation is unique, so it’s wise to model out different scenarios or consult a tax professional to align this with your broader retirement plan.
