2026 Roth Conversion Tax Planning for Public Servants

What Is a Roth Conversion, and Why Consider One in 2026?

A Roth conversion moves money from a traditional, pre-tax account — a traditional IRA, 403(b), 457(b), or TSP — into a Roth account. You pay ordinary income tax on the amount converted in the year you convert it, and in exchange, that money grows tax-free from that point forward.

How Recent Tax Law Changed the Math

The SECURE Act and the End of the "Stretch" IRA

The SECURE Act eliminated the ability for most non-spouse beneficiaries to stretch inherited IRA distributions over their own life expectancy. Instead, they generally must fully distribute an inherited IRA within 10 years — a rule that can force your children or other heirs into large distributions during their own peak earning years, compressing what would have been a decades-long tax deferral into a single decade. At the same time, later RMD ages have widened the window in which retirees can convert before required distributions begin.

The One Big Beautiful Bill Act (OBBBA)

The seven federal income tax brackets established under the Tax Cuts and Jobs Act — 10%, 12%, 22%, 24%, 32%, 35%, and 37% — were originally scheduled to expire at the end of 2025. The One Big Beautiful Bill Act made those brackets permanent, which gives Roth conversion tax planning more certainty than it's had in years.

OBBBA also created a new, temporary enhanced deduction for taxpayers age 65 and older: an additional $6,000 per qualifying individual ($12,000 for a married couple if both spouses qualify), effective 2025 through 2028. It phases out for single filers with modified adjusted gross income (MAGI) over $75,000 and married couples filing jointly over $150,000 — which means a poorly timed conversion can quietly cost you part of this deduction.

The Pitfalls: What a Roth Conversion Can Trigger

A conversion adds to your adjusted gross income, or AGI, in the year you do it, and that has ripple effects well beyond the tax bracket table. Converted amounts can increase the taxable portion of your Social Security benefit, trigger or increase the net investment income tax (NIIT), and push you into a higher Medicare IRMAA surcharge tier (more on this below).

The same higher AGI can also decrease other benefits you're counting on: the Section 199A qualified business income (QBI) deduction, if you have self-employment or pass-through income; ACA marketplace premium subsidies, if you or a spouse are on marketplace coverage before Medicare; the new OBBBA senior deduction described above; and other income-tested benefits tied to your MAGI.

Two more things to know before you convert. First, conversions are irreversible: the Tax Cuts and Jobs Act eliminated the ability to "recharacterize," or undo, a Roth conversion. Second, think carefully about how you'll pay the resulting tax bill. Pulling the tax payment from a traditional retirement account triggers additional income tax on that withdrawal — and a 10% early-withdrawal penalty if you're under 59½ — which reduces the overall value of the conversion. Paying the tax from outside cash, rather than the converted funds themselves, is almost always the better move.

When Does a Roth Conversion Make Sense for You?

In general, conversions tend to make the most sense when you're in a low-income tax year, you hold a large retirement account balance you don't expect to spend down, you have cash outside your retirement accounts to cover the tax bill, or you specifically want to prepay taxes on behalf of your beneficiaries. A few situations often arise for educators and public employees.

The Recently Retired Public Employee

Maximizing What You Leave Behind

If you're confident you won't need your full 403(b), 457(b), TSP, or traditional IRA balance in retirement, converting shifts the tax bill from your heirs to you — and you likely control your own tax rate more precisely than they will. This also insulates your beneficiaries from being forced into the SECURE Act's 10-year distribution window at a rate you can't predict.

The Surviving Spouse "Widow Trap"

Sometimes called the widow trap, this is a real risk for married public employees: when the first spouse dies, the survivor moves to single tax brackets, which compress quickly, and often faces higher Medicare IRMAA tiers on the same household income. Accelerating conversions while both spouses are alive — and filing jointly — can prevent a painful tax increase for the survivor down the road.

How Much Should You Convert? "Filling the Bracket"

A common approach is to convert just enough to "fill" a target tax bracket without spilling into the next one. Using 2026 numbers, a single filer's standard deduction of $16,100, plus the top of the 12% bracket ($50,400 of taxable income), means that about $66,500 of adjusted gross income falls within the 12% bracket. For a married couple filing jointly, the standard deduction of $32,200 plus $100,800 means roughly $133,000 of AGI fills the same bracket.

Source: IRS.gov — 2026 inflation adjustments (incl. One Big Beautiful Bill Act amendments)

One nuance matters a great deal for public-sector readers: a state pension, FERS or CSRS annuity, or Social Security benefit already counts toward this AGI figure. For someone with substantial guaranteed retirement income, the remaining "room" to convert before spilling into a higher bracket — or triggering the IRMAA and taxable Social Security issues above — may be much smaller than it would be for a private-sector retiree living on savings alone. That's exactly why a year-by-year tax projection, not a one-time rule of thumb, is the right tool here.

Medicare's Income-Related Monthly Adjustment Amount (IRMAA) is one of the most common ways a conversion backfires. IRMAA uses a two-year look-back — your 2026 premiums are based on your 2024 tax return — and it's a cliff, not a gradual increase: one dollar over a tier threshold triggers the full surcharge for that tier.

The Backdoor Roth for High-Income Public Employees

If your income is too high to contribute directly to a Roth IRA, a backdoor Roth conversion may still be available. In 2026, the ability to contribute directly to a Roth IRA phases out as shown below.

The strategy: make a nondeductible contribution to a traditional IRA, then convert it to a Roth IRA shortly afterward. The catch is the IRA aggregation rule, often called the pro-rata rule: the IRS requires you to aggregate the value of all your traditional, SEP, and SIMPLE IRAs when calculating the taxable portion of any conversion — you can't cherry-pick just the nondeductible contribution.

Here's the good news for many educators and public employees: 403(b), 457(b), and TSP balances are not IRAs, so they don't count toward the aggregation calculation. That can make the backdoor Roth cleaner for public-sector employees than it is for taxpayers who have accumulated large rollover IRA balances.

Three IRS forms document a Roth conversion: Form 1099-R reports the distribution from the traditional account, Form 8606 tracks your basis and calculates the taxable amount of the conversion (and is essential for backdoor Roth conversions), and Form 5498 reports the conversion contribution received by the Roth IRA. Keep copies of all three.

Documenting Your Decision

Because a Roth conversion can't be undone, it's worth putting your reasoning in writing before you convert — not after. A good record answers a few questions: Why does this conversion make sense (your current tax rate versus your expected future rate, and any preference to prepay taxes for beneficiaries)? What does a multi-year tax projection show, including the impact on IRMAA, taxable Social Security, NIIT, and the QBI or senior deduction? Where will the funds to pay the tax come from — withholding or outside savings? And finally, an acknowledgment that projections rest on assumptions (life expectancy, rate of return, future tax rates) that are estimates, not guarantees, and that the conversion itself is irrevocable.

FAQ: Common Roth Conversion Questions

Conclusion

Roth conversion tax planning isn't a one-size-fits-all decision, and for educators and public servants, pension and annuity income adds a layer most generic retirement calculators don't account for. The right amount to convert — and the right year to do it — depends on your bracket, your Medicare timing, your beneficiaries, and how much guaranteed income you already have coming in. If you'd like help running the numbers for your specific situation, I'd welcome the conversation.