Roth Conversion for Air Traffic Controllers

A Roth conversion for air traffic controllers is a different decision than it is for almost any other federal worker, because the law forces you out of the tower at age 56 and hands you a long, predictable stretch of lower-bracket years before Social Security and before required minimum distributions ever begin.

Why the Roth conversion math is different for air traffic controllers

Three features of your career combine to make the Roth conversion question sharper for controllers: a forced exit at 56, penalty-free access to your Thrift Savings Plan at 50, and a FERS pension plus supplement that keeps you comfortable but rarely in the lowest bracket. Most FERS and TSP explainers treat the pension and the Roth account as separate silos. For a controller they are one connected timing problem.

You leave federal service earlier than a typical FERS employee, draw a pension and a bridge supplement immediately, and have not yet started Social Security (earliest 62) or RMDs (73 or 75, depending on birth year). Those pre-62 and pre-RMD years are the low-marginal-bracket years that make staged conversions worth studying. Conversions carry no income or dollar limit, are taxed as ordinary income, and are irreversible after 2017 (Source: IRS). Our overview of the Roth conversion process covers the general mechanics; this page is about how they land on an ATC balance sheet.

Air traffic controller mandatory retirement age 56 and the planning problem it creates

Federal law separates an air traffic controller on the last day of the month in which they turn 56, unless they qualify for an immediate annuity later (5 U.S.C. Section 8335(a); Public Law 92-297, 1972). The FAA may exempt a controller with exceptional skills and experience until age 61, but the hard default is 56. That single date is why the conversion runway exists and why it starts so early.

Because the FAA sets a maximum entry age so controllers can accrue their service before 56, virtually every controller reaches an early, predictable retirement date. You know years in advance roughly when your salary stops and your pension starts. That predictability is the raw material for a multi-year conversion plan rather than a one-off decision.

The air traffic controller FERS pension calculation and high-3 formula

Controllers use the enhanced FERS formula: 1.7% of your high-3 average salary for the first 20 years of service, plus 1.0% of your high-3 for each year beyond 20 (Source: OPM Computation; CSRS/FERS Handbook Chapter 54). You can retire with an immediate unreduced annuity at 50 with 20 years of ATC service, or at any age with 25 years, with no age reduction (Source: 5 U.S.C. Section 8412(e); OPM).

Here is why that matters for conversions: your pension is a meaningful, dependable stream of lifetime income. A controller with a high-3 near $155,000 and 25 years of service would draw about 39% of high-3, roughly $60,000 a year (illustrative). That base income means the general convert-everything approach may not fit a controller’s situation. You are rarely in a truly empty bracket, so a useful question is how much room sits above your pension inside a target bracket, rather than whether to convert at all.

Penalty-free TSP withdrawal at age 50 under the special provision

Controllers, along with federal law enforcement officers and firefighters, can take TSP withdrawals without the 10% early-withdrawal penalty once they separate in or after the year they turn 50, rather than waiting until 59.5 like most savers (special-provision rule for public safety employees). This is among the earliest penalty-free retirement-account access of any profession.

Early penalty-free access does two things for a conversion plan. It lets you tap the TSP for living expenses or for conversion tax without a penalty, and it lengthens your conversion runway by starting it years before other workers. See our primer on what a Thrift Savings Plan is. Note that the penalty exception applies to withdrawals; a conversion is a separate event taxed as ordinary income.

FERS Special Retirement Supplement earnings test in 2026 and why conversions do not trigger it

The interaction between a Roth conversion and the supplement is worth spelling out. The Special Retirement Supplement (SRS) is calculated roughly as your years of FERS service divided by 40, multiplied by your estimated age-62 Social Security benefit, and it is generally paid until 62. If you take a second-career job after leaving the tower, wages can shrink the supplement through the earnings test. A Roth conversion behaves differently: because it is portfolio income, not wages, it stays outside the earnings test entirely.

For a controller who retires at 56, that opens a specific opportunity. From 56 to 62, the headroom up to your chosen bracket ceiling sits on top of your pension and supplement, and the supplement keeps paying in full. A controller with a wage-earning second career, by contrast, may lose supplement dollars and see conversions pushed into a higher bracket by those same wages. For some controllers, conversions instead of, or before, wages during the bridge years can be one way to preserve the supplement.

Roth conversions before Social Security age 62: your low-bracket window

The years between separation at 56 and claiming Social Security are usually your lowest-bracket adult years. Your pension and supplement are ordinary income, but you have no salary and no Social Security yet, and RMDs are more than a decade away. Once Social Security starts (as early as 62, or later if you delay), your ordinary income steps up and the room for cheap conversions narrows.

That is why the 56-to-62 span tends to carry the largest planned conversions, with smaller conversions continuing from 62 to the year before RMDs. Converting now can also soften the future Social Security tax torpedo, the effect where rising provisional income drags more of your benefit into taxation. Every conversion has a December 31 deadline; our note on the Roth conversion deadline explains why year-end timing matters for a multi-year plan.

TSP to Roth IRA rollover after retirement: the mechanics

The TSP does not offer a partial in-plan Traditional-to-Roth conversion for retirees. The common path is to roll your Traditional TSP to a Traditional IRA, then convert chosen amounts from that Traditional IRA to a Roth IRA year by year (Source: IRS conversion rules). This gives you control over the exact dollar amount you convert each year to hit a target bracket, which the TSP alone does not.

Two cautions specific to your situation. First, the pro-rata rule applies if you hold any after-tax or nondeductible IRA money, because it can make part of each conversion taxable in proportion to your total IRA balances; see our explainer on the pro-rata rule. Second, moving out of the TSP means leaving its low fees and the age-50 penalty-free withdrawal feature behind, so many controllers keep a TSP balance for near-term cash flow and roll only what they plan to convert.

Traditional TSP vs Roth TSP for federal employees

Your TSP holds Traditional (pre-tax) and Roth (after-tax) balances. Traditional contributions lowered your taxable income in your tower years; those dollars are what you later convert. Since 2024, Roth 401(k)-type accounts including Roth TSP no longer carry lifetime RMDs (Source: SECURE 2.0 Section 325). The 2026 TSP elective deferral limit is $24,500, with an $8,000 age-50 catch-up and an $11,250 catch-up for ages 60 to 63 (Source: IRS Notice 2025-67).

For a mid-career controller still working, the question is whether to build Roth TSP now or Traditional now and convert later. Because your salary years put you in a relatively high bracket, many controllers used Traditional TSP for the deduction and plan to convert in the low-bracket 56-to-62 window instead. That is the tradeoff our piece on how much to convert to Roth works through.

Roth conversion tax bracket filling in the gap years

Bracket filling means converting enough each year to reach the top of a chosen bracket, then stopping. For controllers the target is set by your pension and supplement, which already occupy part of a bracket. The room that remains to that ceiling is what a conversion can fill, staying below the next bracket and the surcharge thresholds. The 2026 standard deduction is $16,100 single and $32,200 for married filing jointly (Source: IRS Rev. Proc. 2025-32).

The illustrative plan below shows how the target changes as income sources switch on. All figures are illustrative assumptions for a married controller, not projections or advice, and your brackets, pension, and supplement will differ.

Age band	Base ordinary income (illustrative)	SRS earnings-test exposure	Illustrative annual conversion	Why
56 to 61	Pension ~$60,000 + SRS ~$15,000	None from conversions (not earned income)	Largest planned conversions	Lowest-income years; supplement unaffected by conversions
62 to 64	Pension ~$60,000 + Social Security (SRS ends at 62)	Supplement no longer paid	Smaller conversions	Higher base income leaves less room under the ceiling
65 to 74	Pension + Social Security + Medicare enrolled at 65	n/a	Modest conversions	Manage the two-year IRMAA lookback while finishing the runway
75 and up	Pension + Social Security + RMDs begin (born 1960+)	n/a	Conversions largely complete	Earlier conversions reduce the forced RMD each year

IRMAA impact of Roth conversions for retirees

Once you enroll in Medicare at 65, your Part B and Part D premiums are set by your modified adjusted gross income from two years earlier, the IRMAA lookback. A large conversion at 63 can therefore raise premiums at 65. For controllers this reshapes the plan: the largest conversions can sit in the 56-to-62 window, before the IRMAA lookback ever touches a conversion year.

The surcharge climbs in tiers, so a conversion that nudges you one dollar over a tier boundary can cost a full tier of premium. Sizing conversions to stop below the next IRMAA threshold in your 60s is part of the same bracket-filling discipline. Our guide to the 2026 Medicare IRMAA brackets lays out the tiers to plan around.

Reducing RMDs with Roth conversions as a federal retiree

Required minimum distributions begin at 73 for those born 1951 to 1959 and at 75 for anyone born in 1960 or later (Source: SECURE 2.0; IRS final regulations effective January 1, 2025). A controller reaching 56 in 2026 was born around 1970, so their RMD age is 75, giving a runway of roughly 19 years. Every dollar converted before then is a dollar that will not be forced out as a taxable RMD later.

Because your pension and Social Security already fill part of your later-life brackets, unconverted Traditional balances can push your RMDs, and your surviving spouse’s future RMDs, into higher brackets. Shrinking the pre-tax balance during the low-bracket window is the lever. See our overview of required minimum distributions for how the forced amount is calculated. This also matters for a surviving spouse who later files single, a scenario known as the widow’s penalty.

Roth conversion strategy for law enforcement, firefighter, and other federal special-provision employees

Controllers share the special-provision rules with federal law enforcement officers, firefighters, and certain other public-safety employees: the enhanced 1.7%/1.0% annuity formula, penalty-free TSP access at 50, and the Special Retirement Supplement. The conversion logic on this page applies broadly across those groups, with the caveat that mandatory separation ages differ (controllers at 56; many LEO and firefighter roles at 57).

One structural note: this analysis assumes FERS. If you were hired before 1984 and remain under CSRS, your pension structure differs, so the conversion picture changes. A fee-only fiduciary advisor who works with federal benefits can confirm which system governs your case and whether conversions fit your numbers.

Frequently asked questions

Can air traffic controllers do a Roth conversion before age 59 1/2?

Yes. A conversion has no age requirement and no income limit (Source: IRS). Controllers also benefit from the special provision that removes the 10% early-withdrawal penalty on TSP distributions once they separate in or after the year they turn 50. The conversion itself is simply taxed as ordinary income in the year you do it, whatever your age.

Do Roth conversions count against the FERS Special Retirement Supplement earnings test?

No. The Special Retirement Supplement earnings test reduces the supplement based on wages and self-employment income (Source: OPM CSRS/FERS Handbook Chapter 51). A Roth conversion is portfolio income, not earned income, so it does not count toward that test. A controller can convert in the 56-to-62 window without the conversion counting toward the earnings test, a planning point that many controllers find useful.

Can I convert my Traditional TSP directly to a Roth IRA, or do I need a Traditional IRA first?

The TSP does not provide a partial in-plan Traditional-to-Roth conversion for retirees. The usual route is to roll Traditional TSP funds into a Traditional IRA, then convert chosen amounts to a Roth IRA year by year (Source: IRS). Routing through a Traditional IRA gives you precise control over the annual conversion amount so you can fill a bracket exactly.

Should I pay the conversion tax from my TSP or from outside savings?

Paying the tax from outside, non-retirement savings generally lets the full converted amount stay invested inside the Roth (Source: IRS conversion rules). Withholding the tax from the converted funds shrinks the amount that reaches the Roth, and if you are under the penalty-free age it could add a penalty on the withheld portion. This is educational information, not personalized advice.

Will a Roth conversion increase my Medicare (IRMAA) premiums?

It can, on a two-year delay. Medicare Part B and Part D surcharges are based on your modified adjusted gross income from two years prior, so a conversion at 63 can raise premiums at 65. Sizing conversions below the next IRMAA tier, and front-loading them into the 56-to-62 years before the lookback applies, keeps that surcharge managed.

Does the Roth 5-year rule apply if I retire at 56 and convert?

Yes. Each conversion starts its own five-year clock for penalty-free access to that converted amount, and a separate five-year rule governs tax-free earnings. Conversions made in your 50s each carry their own five-year window, which is why the timing of when those funds are needed matters. Ordering rules generally return contributions and conversions before earnings (Source: IRS).

Is it better to contribute to Roth TSP or convert to a Roth IRA later?

It depends on your bracket now versus in retirement. During your salary years in the tower you are typically in a higher bracket, which is why many controllers used Traditional TSP for the deduction and plan conversions in the lower-bracket 56-to-62 window instead. Roth TSP makes more sense when your current bracket is unusually low. A fiduciary review can compare the two on your numbers.

Sources

• 5 U.S.C. Section 8335 (mandatory separation at 56; waiver to 61); Public Law 92-297 (1972), via Cornell LII and Congress.gov.
• 5 U.S.C. Section 8412(e) and OPM Retirement Center, Types of Retirement and special-provision eligibility (2024-2025).
• OPM Computation and CSRS/FERS Handbook Chapter 54 (enhanced 1.7%/1.0% annuity formula).
• OPM CSRS/FERS Handbook Chapter 51 (Retiree Annuity Supplement / Special Retirement Supplement), March 2022.
• IRS Notice 2025-67 (2026 contribution limits); IRS Rev. Proc. 2025-32 (2026 standard deduction); SSA.
• SECURE 2.0 (RMD ages 73 and 75; Section 325 Roth lifetime-RMD elimination; Section 603); IRS final RMD regulations effective January 1, 2025; Congress.gov CRS IF12750.
• IRS rules on Roth conversions (no income or dollar limit, ordinary-income tax treatment, December 31 deadline, no recharacterization after 2017).