When discussing tax-smoothing strategies, the industry focus almost immediately turns to Roth conversions. It’s a powerful lever—evaluating how to efficiently fill low tax brackets by shifting assets from Traditional IRAs to Roth IRAs.
However, in the rush to optimize conversions, a foundational, highly cost-effective step can sometimes be skipped.
If you earn any income in retirement—whether from consulting, a part-time gig, or a booming Etsy shop—and you stay under the income limit, you have the legal right to make a direct Roth IRA contribution. Yet thousands of retirees leave this tax-free growth on the table every year, jumping straight to conversions while completely ignoring the side-hustle loophole.
For Married Filing Jointly (MFJ) households, the oversight is twice as costly…
1. Why Contributions Should Come Before Roth Conversions
Contributions are the only way to create tax‑free dollars without paying tax today
A Roth conversion forces you to pay tax now. A Roth contribution gives you tax‑free growth without triggering tax. If you skip the contribution and only do conversions, you’re effectively choosing the more expensive path.
Contributions compound for decades — even small ones
A $7,500 Roth contribution growing at 6% becomes:
- $24,050 in 20 years
- $43,050 in 30 years
For MFJ couples, double it. Even if you’re 55 or 60, the compounding window is still meaningful.
Contributions reduce future RMDs
Every dollar contributed directly to a Roth is a dollar shielded from future Required Minimum Distributions (RMDs). While conversions achieve the same result, contributions do it without triggering a current-year tax bill.
Contributions preserve your conversion “space”
If you’re smoothing taxes over time, you want to use your low‑bracket room efficiently. Contributions don’t consume any of that room. Conversions do.
2. Contribution Rules: Single vs MFJ
Contribution limits (same for both)
- $7,500 per person under 50
- $8,600 per person age 50+
Roth eligibility
- Single filers phase out at lower MAGI levels
- MFJ filers get a much higher phase‑out range
- MFJ couples often qualify for Roth contributions even when one spouse earns a high income
Traditional IRA deductibility
- Single: straightforward — depends on income and workplace plan coverage
- MFJ: more complex — one spouse’s workplace plan can affect the other spouse’s deductibility
Spousal IRA (MFJ only)
If your Etsy shop clears a net profit but your spouse doesn’t work, your self-employment income can fund both of your IRAs. The Spousal IRA rule means a single side-hustle can double your household’s annual tax-free contribution space.
3. Best Practices for Single and MFJ Filers
- Contribute first, convert second
Contributions are the cheapest way to create Roth dollars. - Use Roth contributions in low‑income years
Especially early retirement or sabbatical years. - Use Traditional contributions in peak‑income years
When the deduction is most valuable. - Don’t forget catch‑up contributions at age 50+
They add up fast. - Model contributions year‑by‑year
Income, MAGI limits, and tax brackets change over time — your contribution strategy should too.
4. New in the Optimizer: Year‑by‑Year IRA Contributions for Single and MFJ
You can’t accurately model long-term tax smoothing if you’re leaving annual contributions out of the equation.
To solve this, the Roth IRA Conversion Optimizer now features full, year-by-year contribution modeling for both single and MFJ filers. The forecasting engine automatically integrates your annual Roth and Traditional contributions directly alongside RMD projections, Social Security brackets, and conversion optimizations.
You’ll find the new contribution fields located in MFJ Details worksheet—allowing you to map out exactly how that side-hustle income supercharges your net worth over time.
