Roth IRA for Military Members: Roth TSP, Combat Pay, BRS Matching, and Deployment Rules

A service member can often contribute to both Roth TSP and a Roth IRA in the same year. They are different accounts with different limits. The Thrift Savings Plan, or TSP, is the federal workplace retirement plan. A Roth IRA is a personal account opened with a bank, brokerage or other IRA provider.

The word Roth describes a tax treatment, not one particular account. You do not get a tax deduction for a Roth contribution; withdrawals that meet the Roth rules, including investment gains, can be tax-free. A Roth IRA and Roth TSP share that idea, but they do not share one contribution limit.

First, separate the two Roth accounts

A Roth IRA and Roth TSP can both hold retirement investments, but they answer to different rulebooks. The simplest mental model is “personal account” and “workplace plan.”

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With a Roth IRA, depositing cash may not invest it. You may still need to choose investments. TSP contributions instead follow your investment election. New BRS participants default to an age-appropriate Lifecycle fund unless they choose otherwise. For the broader account comparison, use Roth IRA vs. 401(k); TSP plays the workplace-plan role in that comparison.

Start with three questions, not one recommendation

“Should I use Roth?” arrives too early. Three separate questions determine what is allowed and what the tradeoffs are.

1 · IRA room

Can new IRA money go in?

Check qualifying compensation and unused combined Traditional-plus-Roth IRA room.

2 · Direct Roth

Can it go directly to Roth IRA?

Filing status and Roth modified adjusted gross income, or MAGI, control direct access.

3 · Account choice

Where should the next dollar go?

BRS matching, payroll timing, investment menu, access and remaining limits shape the choice.

What on the LES and W-2 creates IRA room?

The Leave and Earnings Statement (LES) shows military pay and deductions. The W-2 groups that information for the tax return. For IRA purposes, the label “tax-free” is not enough to tell whether something counts. Congress wrote a specific exception for nontaxable combat-zone pay; most other excluded benefits do not share it.

Three allowance names appear below: Basic Allowance for Housing (BAH), Basic Allowance for Subsistence (BAS, for food), and Overseas Housing Allowance (OHA).

Combat pay goes through two different meters

The same pay answers two different questions: have you earned enough to contribute, and is your income below the direct Roth IRA cutoff? Combat pay can help with the first without increasing the income measured for the second.

Meter 1 · IRA compensation

Code Q pay counts

Taxable military wages plus nontaxable combat-zone pay can support a regular Traditional or Roth IRA contribution.

Meter 2 · Roth MAGI

Excluded combat pay stays excluded

The Pub. 590-A Roth-MAGI worksheet does not add excluded combat pay back. Other income, filing status and adjustments still matter.

Worked example · both meters

$70,000 box 1 + $30,000 Code Q + $18,000 BAH/BAS

Assume a single service member under 50, no other income or adjustments, and no other regular IRA contributions. IRA compensation is $100,000: taxable pay plus Code Q combat pay. The $18,000 of BAH/BAS adds zero to that meter. Roth MAGI is $70,000, below the $153,000 single-filer phaseout start. The member can therefore make the full $7,500 direct Roth IRA contribution.

The contribution meter sees $100,000. The Roth-income meter sees $70,000.

A smaller example shows why the annual limit is a ceiling, not an entitlement. A member under 50 with only $5,400 of Code Q pay and no other compensation can contribute no more than $5,400, not $7,500.

Keep four 2026 ledgers separate

These dollar limits are easy to misapply because three belong to workplace plans and one belongs to IRAs. Write each on a separate line before doing the math.

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The $72,000 annual-additions test is generally applied per employer, unlike the person-wide employee-deferral limit. A Guard member’s unrelated civilian employer plan can have a separate annual-additions limit, even though the member must still combine employee deferrals across the plans.

Age 50 or older? Here is what “catch-up” means

Catch-up is extra contribution room for older savers. In 2026, the ordinary TSP age-50 catch-up is $8,000, making a total employee limit of $32,500. The higher catch-up at ages 60–63 is $11,250, for a total of $35,750.

If applicable 2025 wages from the plan sponsor exceeded $150,000, 2026 catch-up contributions must use Roth treatment. That test is based on the relevant prior-year wages, not household income. Confirm the payroll treatment, especially if you have more than one employer.

For 2026 direct Roth IRA contributions, the MAGI phaseout is $153,000–$168,000 for single or head of household; $242,000–$252,000 for married filing jointly or qualifying surviving spouse; and $0–$10,000 for married filing separately when the spouses lived together at any point. A phaseout means the allowed contribution shrinks across that income range. Deployment orders alone do not answer the MFS living-together test.

How BRS matching works

The Blended Retirement System (BRS) combines a pension formula with TSP contributions. For a new entrant, the service automatic 1% begins after 60 days. Matching begins after 24 months; service contributions generally continue through 26 years of service. The automatic 1% becomes yours to keep after two years of service. Matching dollars are yours when received. Members who opted into BRS from the older system had different start timing.

Member · 5%

$200

from $4,000 basic pay

Service automatic · 1%

$40

no member contribution required

Service matching · 4%

$160

once match-eligible

Total monthly TSP deposit: $400

The first 3% of basic or inactive-duty pay contributed by the member is matched dollar for dollar. The next 2% is matched at 50 cents per dollar. That produces a 4% match when the member contributes 5%, plus the separate 1% automatic contribution. Special, incentive and bonus pay may be eligible contribution sources, but they do not increase the BRS match base.

A neutral order for the next retirement dollar

There is no one account order that fits every military household. A useful decision sequence is:

1. Protect any available BRS match. Confirm eligibility and the contribution percentage that will continue through each matching pay period.
2. Confirm IRA compensation. Add taxable qualifying pay and Code Q combat pay; do not automatically add BAH, BAS or other excluded benefits.
3. Check unused IRA room. Subtract regular Traditional and Roth IRA contributions already made for the year.
4. Check direct Roth MAGI. Compensation and MAGI are separate; a valid IRA contribution may still need a Traditional IRA or another route if direct Roth access is phased out.
5. Compare account features. Payroll automation, TSP’s menu, a personal IRA’s provider menu, access rules and remaining limits may matter differently to different households.
6. Recheck deployment or civilian-plan overlap. Combat pay, a civilian 401(k), catch-up status and pay periods remaining can change the arithmetic.

This is a rule-checking order, not a personalized recommendation to maximize every account. Emergency cash, high-cost debt, family needs and near-term transitions still belong in the household decision.

During a combat-zone deployment, TSP has two ceilings

The next example leaves age-based catch-up contributions aside. Roth TSP payroll contributions from tax-exempt combat pay still use the ordinary $24,500 employee-deferral ceiling. Traditional TSP contributions from that tax-exempt pay have a special path beyond it, toward the $72,000 annual-additions ceiling. Service contributions also use that larger ceiling; eligible catch-up contributions do not.

TSP total ceiling · $72,000

TSP employee contributions + Service Automatic + matching; catch-up excluded.

TSP share of the ordinary $24,500 employee limit

Your traditional pre-tax and Roth TSP payroll deferrals.

The narrow bridge: additional traditional TSP contributions from tax-exempt combat-zone pay may fill space between the two ceilings.

Ceiling example · room is not a recommendation

$24,500 into TSP + $3,000 service money

Assume all $24,500 of employee deferrals went into TSP and no catch-up is involved. Annual additions used are $27,500. Remaining room before the $72,000 ceiling is $44,500. Additional traditional TSP contributions from eligible tax-exempt combat pay could potentially use that space, subject to eligible pay, net pay, deductions, payroll rules and match timing.

$72,000 − $27,500 = $44,500.

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Preserve the match across the calendar

BRS matching is calculated by pay period. If a member reaches the annual employee-deferral limit and payroll contributions stop, there may be no member contribution to match in later pay periods. TSP does not describe a year-end true-up that repairs the missing match.

Example: monthly basic pay of $6,000 produces a maximum monthly match of 4% × $6,000 = $240. If eligible member contributions stop for August through December, five matches could disappear: 5 × $240 = $1,200. The automatic 1% can continue, but it does not replace the match.

A practical check is to divide the intended remaining contribution by the eligible pay periods left and confirm the resulting election with myPay or the appropriate payroll system. This is especially important before directing a large bonus or deployment payment to TSP.

A combat-zone IRA deadline can be longer than 180 days

The normal deadline for a 2026 regular IRA contribution is generally April 15, 2027. An ordinary tax-return filing extension does not extend that contribution deadline.

Qualifying combat-zone, direct-support or contingency-operation service can postpone it. The calculation has three pieces, so “you get 180 days” is incomplete.

1 · Covered period

Service or qualified hospitalization

Use the later applicable end date.

2 · Add

180 days

This is one component, not the entire formula.

3 · Add

Unused original period

Add the days that remained when qualifying service began.

A routine overseas assignment is not automatically qualifying service. Keep the orders and relevant dates, tell the IRA custodian which tax year the late contribution belongs to, and retain Form 5498. Custodians use Form 5498 boxes 13a–13c to report qualifying postponed contributions. Spouses generally share the relief, with statutory exceptions.

Guard and Reserve members may have two workplace plans

A civilian 401(k) or 403(b) and uniformed-services TSP generally share one person-wide employee-deferral limit. Payroll systems at two employers may not know what the other plan received, so the member has to keep the combined ledger.

Guard example · two plans, one deferral limit

$18,000 civilian 401(k) + $6,500 TSP

The combined plan deferral is $24,500, which uses the full 2026 person-wide employee-deferral limit. A separate Roth IRA contribution of up to $7,500 may still be possible after checking compensation, unused IRA room and Roth MAGI.

Reserve rules also use several different day tests. More than 90 days of active duty can matter for whether a member is treated as covered by an employer plan for a Traditional IRA deduction. A separate qualified-reservist distribution rule generally requires a call to active duty for more than 179 days or an indefinite period and a distribution during the eligible window.

In the qualified case, an $8,000 taxable Traditional IRA distribution could avoid $800 of 10% additional tax. Ordinary income tax may still apply. Up to $8,000 could later be repaid under the special rule through the date two years after active duty ends. That repayment does not consume ordinary IRA room, but it is nondeductible and does not erase the distribution’s earlier ordinary income tax.

New for 2026: TSP Roth in-plan conversions

Beginning January 28, 2026, eligible active, separated and retired participants can move traditional TSP money to the Roth balance inside TSP. This is called an in-plan conversion. The taxable portion becomes income for the conversion year. The transaction cannot be reversed, and TSP does not withhold tax from the converted amount; plan to pay any tax from money outside the account.

Check the conversion limits before requesting one

The minimum conversion is $500, with up to 26 requests per calendar year. TSP also requires at least $500 retained in each applicable source balance: tax-deferred employee, tax-exempt employee, automatic 1% and matching. Having a total vested balance of $500 is therefore not enough by itself.

Spouse beneficiary participants can qualify; nonspouse beneficiaries cannot. Administrative holds can block a request, and money in the Mutual Fund Window must first move back to core TSP funds. Any required minimum distribution for the year must be satisfied first. Check the amount TSP actually makes available for conversion.

A member with tax-exempt combat-pay principal cannot select only that nontaxable layer. Suppose a $100,000 traditional TSP balance contains $10,000 of tax-exempt combat-pay principal. The nontaxable ratio is 10%. A $20,000 in-plan conversion therefore includes $2,000 nontaxable and $18,000 taxable.

An in-plan conversion is different from directing new pay to Roth TSP and different again from rolling money to a Roth IRA after separation. Use the full Roth conversion guide before treating any conversion as a simple account transfer.

Leaving service does not require closing TSP

A vested TSP balance can generally remain in TSP after separation. An eligible Roth TSP distribution can generally move directly to a Roth IRA. Pretax traditional TSP money can generally move tax-deferred to a Traditional IRA; moving it to a Roth IRA is normally a taxable conversion.

Tax-exempt combat-pay basis inside traditional TSP deserves extra care. Confirm that the receiving IRA or plan accepts the source and will preserve its tax character before starting the rollover. A Roth IRA cannot be rolled into TSP. For the general routes, use 401(k)/TSP-to-Roth IRA rollover rules and the rollover reference.

Spouses, VA benefits and a rare survivor rollover

On a joint return, one spouse’s qualifying compensation can support contributions to two separate IRAs. Each spouse keeps a per-person limit, and combined contributions cannot exceed combined compensation. With $12,000 of qualifying combat pay and both spouses under 50, one possible allocation is $7,500 to one IRA and $4,500 to the other, assuming direct Roth eligibility and no other IRA deposits. Two $7,500 contributions would require at least $15,000 of combined compensation.

VA disability compensation alone does not create IRA room. A married couple may nevertheless use the spousal IRA rule when a joint return and sufficient household compensation support it.

Keep a military retirement record packet

The rules are easier to defend when the records are together. Save:

• Leave and Earnings Statements;
• Form W-2 box 1 and box 12 Code Q;
• TSP statements separating Roth, traditional and tax-exempt sources;
• Form 5498 and the IRA contribution-year confirmation;
• civilian 401(k)/403(b) year-to-date deferrals;
• deployment orders, combat-zone dates and hospitalization records when relevant;
• Reserve call-up and release dates; and
• written receiving-custodian confirmation before moving tax-exempt TSP basis.

A PCS or domicile change can affect state tax, but it does not change the federal Roth IRA or TSP contribution limits. Use the applicable state guide for state-specific retirement-income, residency and creditor rules.