Roth Conversion for Professors: 403(b), 457(b) and TIAA Timing

A Roth conversion involves different considerations for professors than for typical 401(k) and IRA savers, because faculty usually hold a 403(b) and, at public universities, a separate governmental 457(b), and their taxable income swings hard across grad school, sabbaticals, the tenure climb, and the gap years before a pension and Social Security begin.

Roth conversion for professors: why a faculty paycheck changes the math

A Roth conversion moves money from a pre-tax account (403(b), 457(b), or traditional IRA) into a Roth account. You pay ordinary income tax on the converted amount now, and qualified growth and withdrawals later come out tax-free. Two features set professors apart: the ability to stack two large pre-tax plans, and an income curve with predictable dips that lower the tax cost of converting.

The result is a persona-specific pattern. Faculty often accumulate oversized pre-tax balances (from the 403(b) plus 457(b) stack described below), then face reduced-income years when the same conversion is taxed at a lower marginal rate. Conversions carry no income or dollar limit, are taxed as ordinary income, and are irreversible after the 2017 law repealed recharacterization (Source: IRS, Roth conversion guidance; TCJA effective 2018). See our overview of Roth conversion planning.

Why a low income year is the professor’s prime conversion window

The general principle is that a conversion tends to cost less when the marginal bracket is temporarily low rather than during peak-earning years. A professor’s income is rarely flat. Grad and postdoc years, an unpaid or half-pay sabbatical, a phased-retirement year at reduced pay, and the gap between leaving the university and starting pension or RMD income all compress taxable income, so the same dollars convert at a lower rate than at peak salary.

Because a conversion is taxed as ordinary income, the marginal rate in a low-income year drives much of the result: a conversion done at 12 percent rather than 24 percent changes the lifetime cost of the same pre-tax dollar. Timing, not just amount, drives the outcome, and the horizon before withdrawals matters as much as the rate.

Roth conversion for university employees: the 403(b) plus 457(b) stack

Public-university faculty can defer to two separate elective-deferral plans in the same year. The governmental 457(b) limit is not combined with the 403(b) or other 402(g) plans, so the two run independently (Source: IRS, “How much salary can you defer…”, irs.gov). This is the mechanism that quietly builds the oversized pre-tax balance that later invites conversion planning.

For 2026, the base elective-deferral limit is $24,500 for each plan, with an age-50 catch-up of $8,000 and an enhanced catch-up of $11,250 for ages 60 to 63 (Source: IRS Notice 2025-67, 2026). One caveat: the 403(b) limit IS aggregated with any 401(k) you hold, but the governmental 457(b) sits fully outside that shared 402(g) limit (Source: IRS, irs.gov).

457(b) Roth conversion rules for public vs private universities

Whether your 457(b) is governmental matters. Public-university faculty usually have a governmental 457(b), which supports the separate deferral limit above plus a special catch-up in the three years before normal retirement age of up to twice the annual limit ($49,000 in 2026), not combined with the age-50 catch-up (Source: IRS, irs.gov). Private nonprofit universities often use a non-governmental top-hat 457(b), subject to the employer’s creditors with different catch-up and rollover rules.

That distinction drives whether an in-plan conversion or a rollover is even available, so confirming plan type with your provider comes first.

How an in-plan Roth conversion inside a 403(b) works

Many university 403(b) plans allow an in-plan Roth conversion, moving pre-tax balances to a designated Roth source inside the same plan without rolling out to an IRA. The plan document controls availability, and not every plan offers it. Where offered, the converted amount is taxed as ordinary income in the conversion year, and Roth 403(b) balances no longer face lifetime RMDs beginning 2024 (Source: SECURE 2.0; IRS guidance).

Governmental 457(b) plans may permit in-plan Roth conversions on a similar basis. University HR pages typically cover how to execute an in-plan conversion; separate questions of timing and bracket strategy are where the professor-specific planning considerations below come in.

How to do a TIAA Roth conversion

Because TIAA administers a large share of university 403(b) and 457(b) plans, execution often runs through TIAA. The general steps: confirm your plan allows in-plan Roth conversions or an out-of-plan rollover, identify which pre-tax balances are eligible, request the conversion amount, and arrange to pay the resulting tax from outside funds. Coordination with the plan’s own rules still applies.

One wrinkle is specific to faculty: TIAA Traditional annuity liquidity depends on the contract. Some accumulation contracts (for example RA and GRA types) pay out only in installments through a Transfer Payout Annuity over a period of years, while SRA, RC, and IRA versions can have different or fuller liquidity (Source: TIAA contract disclosures). That can limit how much TIAA Traditional converts in a single year, so contract type shapes the schedule.

Roth conversion during a sabbatical or reduced-pay leave

A sabbatical or unpaid leave at half pay or no pay is a textbook low-bracket window. With salary temporarily reduced, taxable income falls, and a conversion sized to the sabbatical year can be taxed at a materially lower marginal rate than the same conversion during a full-salary year. Sabbatical arrangements are institution-specific HR terms, not an IRS status, so timing tracks your actual pay schedule.

Professors have added flexibility here: tenured faculty face no mandatory retirement age, since the ADEA exemption that once allowed forced retirement of tenured faculty expired at the end of 1993 (Source: ADEA amendments, Pub. L. 99-592). That lets faculty plan reduced-pay or phased-retirement years deliberately as conversion windows rather than on a fixed timetable.

Filling tax brackets with Roth conversions: how much a professor converts

Bracket-filling means converting just enough to reach the top of a target bracket (often 12, 22, or 24 percent) without spilling into the next tier. The headroom between current taxable income and the bracket ceiling is what a conversion can fill. One factor that can matter is paying the conversion tax from outside, non-retirement savings, so the full converted balance keeps compounding in the Roth. The table below is illustrative only, not a projection.

For 2026 the 12 percent bracket for married-filing-jointly filers tops at $100,800, so the illustrative $97,800 taxable total after conversion stays within it (Source: IRS 2026 inflation adjustments). Bracket thresholds are set annually by the IRS, so the exact ceiling changes each year and warrants confirmation before sizing. For the method behind sizing a conversion, see how much to convert to Roth.

Roth conversion before RMDs: the gap years before pension income

The years between leaving the university and the start of pension income, Social Security, and required minimum distributions are often a professor’s lowest-bracket stretch of adult life. Converting during that gap can front-load decades of tax-free compounding and shrink the pre-tax balance that later drives RMDs. RMDs begin at age 73 now, rising to 75 for those born in 1960 or later starting 2035 (Source: SECURE 2.0; IRS).

Filling brackets across several gap years can reduce future RMDs and the tax spikes they trigger. See our overview of required minimum distributions for 2026 and, for the survivor-tax angle many faculty households weigh, the Social Security tax torpedo.

Roth conversion for grad students and postdocs

Grad students, postdocs, and early-career faculty are the other sub-persona. In a temporarily low-income year, converting even modest pre-tax balances (a prior-employer 403(b), a small traditional IRA, or an old 401(k)) can happen at a low rate. The 2026 IRA contribution limit is $7,500, or $8,600 at age 50 and older; direct Roth IRA contributions phase out at MAGI of $153,000 to $168,000 single and $242,000 to $252,000 MFJ (Source: IRS Notice 2025-67).

The caution for this group is income-sensitive: a conversion raises MAGI, which can affect income-driven student-loan repayment amounts, financial-aid formulas, and credit eligibility that year. Those side effects, covered in the FAQ, often matter more to a borrower than the small tax saved.

Backdoor Roth for professors at peak salary

At full-professor salary, direct Roth IRA contributions may be phased out, but there is no income limit on conversions (Source: IRS, Roth conversion guidance). A backdoor Roth (a nondeductible traditional IRA contribution followed by a conversion) can add Roth dollars in peak-earning years. The catch for anyone with existing pre-tax IRA balances is the pro-rata rule, which taxes the conversion proportionally across all traditional IRA money.

Faculty sometimes sidestep pro-rata by keeping pre-tax dollars inside the 403(b) rather than an IRA. See our explainer on the pro-rata rule before attempting this. Note also that under SECURE 2.0 section 603, age-50-plus catch-up contributions for high earners (prior-year FICA wages above the statutory $145,000, indexed) will eventually have to be Roth; the rule phases in generally after 2026, with a later applicability date for governmental and collectively bargained plans, which covers many public-university faculty (Source: IRS final regulations, IRB 2025-40; Notice 2023-62).

How Rothology’s Roth conversion service works for professors

Rothology Premier Roth Conversion is a flat-fee, fiduciary planning engagement. For a professor, the work typically maps the 403(b) and 457(b) balances, identifies low-bracket windows (grad years, sabbatical, phased retirement, or gap years), models multi-year conversion amounts against bracket ceilings and MAGI thresholds, and produces tax projections coordinated with the plan provider. Q3 Advisors is a fiduciary and sells no products.

Typical clients hold $750,000 or more in pre-tax assets. Engagements are educational and factual, and any figures stay illustrative until modeled against your own tax situation with your CPA.

Frequently asked questions

Can I do a Roth conversion inside my 403(b) or 457(b), or do I have to roll it out to an IRA first?

It depends on your plan document. Many university 403(b) plans and governmental 457(b) plans allow in-plan Roth conversions with no rollout required. Others require rolling eligible pre-tax balances to an IRA first, then converting. The converted amount is taxed as ordinary income either way (Source: IRS, Roth conversion guidance). Confirm the option with your plan provider.

Will a Roth conversion hurt my student loan payments or PSLF while I’m in grad school or early faculty years?

It can. A conversion is taxed as ordinary income and raises your MAGI for that year, which income-driven repayment plans use to set your monthly payment. A higher MAGI can increase payments and affect financial-aid and credit calculations. For borrowers pursuing PSLF, the interaction with payment amounts often outweighs the small tax saved, so many model it first.

How does a Roth conversion affect my future Medicare premiums (IRMAA) and Social Security taxes?

A conversion raises MAGI in the conversion year, which can push you into a higher IRMAA Medicare surcharge tier (assessed on a two-year lookback) and can increase the share of Social Security benefits that is taxable. Converting during gap years before Medicare and benefits begin can reduce those effects. See our Medicare IRMAA 2026 brackets page.

Do I pay the conversion tax from the amount I convert, or from other savings?

Paying from outside, non-retirement savings can be an important factor, because the entire converted balance stays in the Roth and keeps compounding tax-free. Paying the tax from the converted amount shrinks the balance and, before age 59 and a half, can trigger penalties on the withheld portion. This is one consideration in conversion planning, though outcomes depend on your situation.

Is there an income limit that stops professors from doing Roth conversions?

No. Roth conversions carry no income or dollar limit, which is different from direct Roth IRA contributions, where the 2026 MAGI phase-out is $153,000 to $168,000 single and $242,000 to $252,000 MFJ (Source: IRS Notice 2025-67, 2026). A professor at any salary can convert; the question is the marginal rate paid in the conversion year, not eligibility.

Should I convert during the gap years between retiring from the university and starting my pension or RMDs?

Those gap years are frequently a professor’s lowest-bracket window, before pension income, Social Security, and RMDs (age 73, rising to 75 for those born in 1960 or later from 2035) begin (Source: SECURE 2.0; IRS). Converting then can lower future RMDs and taxes. Whether it fits depends on your balances, other income, and IRMAA and ACA-subsidy effects, which are worth modeling.

Sources

• IRS Notice 2025-67 and IRS newsroom, “401(k) limit increases to $24,500 for 2026” (2026): 2026 deferral, catch-up, IRA, and Roth IRA MAGI figures.
• IRS Rev. Proc. 2025-32 and IRS newsroom 2026 inflation-adjustment release (IRS Notice 2025-67): 2026 standard deduction and income-tax bracket thresholds.
• IRS, “How much salary can you defer if you’re eligible for more than one retirement plan?” (irs.gov): 403(b) and 457(b) limits not coordinated; 457(b) three-year special catch-up.
• IRS, Roth conversion guidance: no income or dollar limit, taxed as ordinary income, December 31 deadline, irreversible after 2017 (TCJA).
• IRS and SECURE 2.0: RMD age 73 (75 for those born 1960 or later from 2035); Roth 403(b) lifetime RMDs eliminated beginning 2024.
• IRS, “Treasury, IRS issue final regulations on new Roth catch-up rule,” IRB 2025-40; Notice 2023-62: section 603 high-earner Roth catch-up, phase-in and delayed applicability for governmental and collectively bargained plans.
• TIAA contract disclosures and product literature: TIAA Traditional annuity liquidity varies by contract type.
• Age Discrimination in Employment Act amendments (Pub. L. 99-592): expiration of mandatory-retirement exemption for tenured faculty, effective 1994.