TSP Combat-Zone Tax-Exempt Contributions: Tracking the Basis When You Roll to a Gold IRA

Updated: July 28, 2026

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Roughly 2.1 million uniformed service members hold a Thrift Savings Plan account, and the Federal Retirement Thrift Investment Board reports that combat-zone tax-exempt contributions sit inside a meaningful share of those balances. The mechanism is unique to military TSP: pay earned in a designated combat zone is excluded from federal income tax under 26 U.S.

Code §112, and when a service member elects to contribute that already-untaxed pay to Traditional TSP, the contribution becomes after-tax basis (the earnings still grow tax-deferred). The result is a Traditional TSP balance that is part pre-tax, part after-tax.

Roll it to a gold IRA without tracking the split, and the IRS will treat the entire distribution as ordinary income at retirement.

What combat-zone tax-exempt contributions are, in IRS terms

Pay earned by a member of the U.S. Armed Forces while serving in a designated combat zone, qualified hazardous duty area, or contingency operation is excluded from federal gross income under IRC §112. The exclusion is automatic on the W-2 (Box 12, code Q) and is documented for service members in IRS Publication 3 (Armed Forces’ Tax Guide).

For commissioned officers, the exclusion is capped at the highest enlisted base pay rate plus imminent danger pay. For enlisted members and warrant officers, the full pay for any month of service in a combat zone is excluded.

The Thrift Savings Plan adds a layer on top. When a service member elects to contribute combat-zone tax-excluded pay to Traditional TSP, the contribution itself is already after-tax for federal purposes (no income tax was ever owed on it). The contribution becomes basis in the Traditional TSP, while earnings on that basis grow tax-deferred and are taxable at distribution.

This is the mechanism that creates a Traditional TSP balance with a mixed character: part pre-tax (regular contributions and employer match), part after-tax (the combat-zone contribution dollars).

If the service member elects to contribute combat-zone pay to Roth TSP, the contribution is already in the right tax bucket: after-tax going in, qualified withdrawals tax-free at distribution. No basis tracking is needed because the entire Roth account is basis. The TSP documents this choice in the tsp.gov contribution election forms. The choice cannot be changed retroactively.

Service members who routed combat-zone contributions to Traditional TSP carry the basis forward; those who routed them to Roth TSP have no basis tracking to do.

Tax treatment differs sharply between Traditional and Roth combat-zone contributions, and the difference matters most at the rollover. Consult your tax advisor before electing the destination IRA type; this guide explains the mechanics but is not a substitute for individual tax counsel.

How the TSP records the basis: 1099-R Box 5 and Form 1099-R mechanics

When the TSP processes a distribution or a direct rollover, it issues Form 1099-R the following January. For a combat-zone-affected Traditional TSP balance, the form has two lines that matter for basis tracking:

• Box 1 (Gross distribution): the full dollar amount distributed or rolled, including both the pre-tax and after-tax portions.
• Box 2a (Taxable amount): the portion subject to ordinary income tax. For a Traditional-to-Traditional direct rollover this reads $0, but for an indirect rollover or a Roth conversion of the basis portion the figure becomes important.
• Box 5 (Employee contributions / Designated Roth contributions or Insurance premiums): the after-tax basis amount. For a service member who contributed combat-zone pay to Traditional TSP, this is the dollar figure the IRS recognizes as already-taxed.
• Box 7 (Distribution code): code G for a direct rollover to a qualified plan or IRA; codes 1, 2, or 7 for distributions taken directly. Code H denotes a designated Roth-to-Roth direct rollover.

Box 5 is the single line that proves the basis exists. Lose the 1099-R, and you may still recover the basis figure from the TSP annual statements and from your contribution history at tsp.gov, but the burden of proof shifts to you in any IRS examination. The TSP retains records, but you should not rely on third-party recordkeeping for a figure that may become relevant 20 or 30 years after the contribution was made.

For more on the broader rollover paperwork picture for federal employees and military members, see our TSP-to-gold-IRA rollover guide for federal employees. It covers the standard procedural steps that apply on top of the basis-tracking layer described here.

The two routes for the combat-zone basis at rollover, and why one is materially better

When a Traditional TSP balance with combat-zone basis is rolled out, the basis (after-tax) portion and the pre-tax portion are not automatically separated by the TSP at distribution.

Under IRS Notice 2014-54, a participant can direct the basis portion to a Roth IRA and the pre-tax portion to a Traditional IRA in one coordinated rollover. There is no tax cost on either leg. This is the most valuable mechanism available to military retirees with combat-zone basis. It is widely under-used.

Route 1: split-rollover (recommended). The participant directs the TSP to send the after-tax basis portion to a Roth IRA and the pre-tax portion to a Traditional IRA on the same rollover request. The Roth IRA receives money that is already-taxed and grows tax-free from that point forward; qualifying withdrawals at retirement are tax-free under IRS Publication 590-B.

The Traditional IRA receives the pre-tax portion and continues to grow tax-deferred. No Form 8606 is needed because the basis is now isolated inside the Roth.

Route 2: combined Traditional rollover with Form 8606 tracking. The participant rolls the entire Traditional TSP balance to a single Traditional IRA. The basis travels with it but is no longer separable from the pre-tax money inside the IRA.

To preserve the basis for tax purposes, the participant must file Form 8606 (Nondeductible IRAs) for the year of the rollover, reporting the after-tax basis carried into the IRA.

Every subsequent distribution from any Traditional IRA the participant holds is then subject to the pro-rata rule under IRC §408(d)(2), which spreads the basis recovery proportionally across the lifetime of the account. The basis is not lost, but the recordkeeping burden continues for 20 or 30 years.

For most military retirees with a meaningful combat-zone basis, Route 1 is the materially better path. It eliminates the ongoing pro-rata calculation, keeps the account clean for your spouse or heirs, and lets the basis grow tax-free for the rest of the retirement horizon.

Route 2 is appropriate only when the participant has a strong reason to keep the entire balance Traditional (for example, an active Roth conversion ladder strategy already in progress elsewhere). Discuss the choice with a tax advisor before the TSP transfer paperwork is submitted.

Step-by-step: how to execute a clean split-rollover with the TSP

The procedure has six ordered steps. Done in this sequence, the basis lands in the Roth gold IRA without a taxable event. Done out of order, the basis can be commingled with pre-tax money and become subject to the pro-rata rule for the rest of the participant’s life.

Figure 1. The six-step combat-zone basis split-rollover sequence. Steps 1 through 3 establish the receiving accounts. Steps 4 through 6 direct the basis to the Roth IRA and the pre-tax portion to the Traditional IRA.

1. Confirm the basis amount. Pull every Form 1099-R the TSP has issued for combat-zone contribution years, plus the annual TSP statement that breaks down traditional balance by source. The basis is the cumulative dollar figure shown as Box 5 across all distributions, or as combat-zone-contribution totals on the annual statements. If you have never taken a distribution, request a basis statement directly from the TSP through tsp.gov before submitting the rollover paperwork.
2. Open two receiving accounts at the IRA custodian. A self-directed Roth IRA to receive the basis, and a self-directed Traditional IRA to receive the pre-tax portion. Both should be at the same custodian to simplify the routing. The custodian provides separate account numbers for each.
3. Notify the dealer of the split allocation. The dealer that will purchase metals needs to know that two accounts will fund the metals purchase, and which account will hold which products. Some custodians require that the Roth IRA and the Traditional IRA each purchase separate physical metal lots; ask before the rollover.
4. Submit the TSP withdrawal request with split instructions. Log in to tsp.gov, select withdrawal, choose the option to transfer to an IRA, and specify two destination accounts. The TSP form allows you to designate the basis portion to one IRA and the remainder to another. Provide both account numbers, the receiving custodian’s wire instructions for each account, and confirm the destination as Roth IRA for the basis and Traditional IRA for the pre-tax portion.
5. Verify the two checks or wires. The TSP issues two separate transactions, each made out to the custodian for benefit of (FBO) you. The basis check should equal the Box 5 basis figure; the pre-tax check should equal the remainder. Reconcile both amounts before instructing the dealer to purchase metals.
6. Purchase IRS-approved metals and confirm storage. Once both accounts are funded, instruct the dealer on the metals to buy in each account separately. The metals must meet IRS fineness standards under IRC §408(m): gold .995+ (American Gold Eagles are an exception named in statute), silver .999+, platinum .9995+, palladium .9995+. Storage must be at an IRS-approved depository in segregated or commingled accounts; home storage was rejected by the Tax Court in McNulty v. Commissioner, 157 T.C. No. 10 (2021), with the entire IRA balance reclassified as a taxable distribution.

What it costs if the basis is mishandled: a $200,000 hypothetical

Consider a retired senior NCO with a Traditional TSP balance of $200,000 at age 60, of which $40,000 is combat-zone basis accumulated across multiple deployments. The participant rolls to a gold IRA and elects to start taking $20,000 annual distributions at age 65 to supplement a military pension. Assume a 22% federal marginal bracket and no state income tax. The table compares the three most common outcomes across the rollover and the first five years of distributions.

Over a typical 25-year retirement horizon, the gap between the clean route and the lost-basis route on a $40,000 combat-zone basis is in the $8,000 to $10,000 range in lifetime tax. That is the cost of a single procedural choice at the rollover desk. Past performance and individual results vary; consult your tax advisor for your specific situation.

Common mistakes military retirees make with combat-zone basis at rollover

The combat-zone basis layer adds five recurring errors to the standard TSP rollover risk set. Each is documented in IRS examination cases or in service-member tax-clinic patterns.

Mistake 1: rolling the entire Traditional TSP balance to a Traditional IRA and never filing Form 8606. The basis is now commingled, the participant has no contemporaneous documentation, and on first distribution the IRS treats the entire amount as ordinary income. Recovery requires reconstructing the basis from old 1099-Rs and TSP statements, then filing Form 8606 retroactively, a process the IRS may or may not accept depending on the documentation quality.

Mistake 2: rolling the basis portion to a Traditional IRA when a Roth IRA is the better destination. The participant skips IRS Notice 2014-54’s split-rollover mechanism and ends up with after-tax basis trapped inside a Traditional IRA for the rest of retirement. The basis is preserved on paper through Form 8606, but the practical benefit (tax-free growth on already-taxed money) is lost.

Mistake 3: treating Roth TSP contributions from combat-zone pay as if they had basis to track. Roth TSP contributions are already in the Roth bucket; the entire account is basis. No Form 8606 is needed and no split-rollover is needed. Rolling Roth TSP to a Roth IRA directly preserves the qualified withdrawal treatment under the 5-year clock rules in IRS Publication 590-B.

Mistake 4: accepting an indirect rollover and missing the 60-day redeposit window. The 20% federal withholding on indirect rollovers (IRC §3405) leaves the participant short by 20% of the gross amount, which must be replaced from outside funds within 60 days or the shortfall is taxable.

For the basis portion specifically, this can convert tax-free basis into an early withdrawal subject to the 10% penalty under age 59½ (the public-safety exception under IRC §72(t)(2)(A)(v) does not apply to most military separations). Direct trustee-to-trustee rollover is the operational default for combat-zone basis movement.

Mistake 5: rolling out before resolving an outstanding TSP loan. An unpaid TSP loan at the moment of separation or rollover becomes a deemed distribution and is subject to ordinary income tax (plus the 10% early-withdrawal penalty if under 59½). The loan balance does not roll over with the rest of the account, and the deemed distribution is reported on Form 1099-R with code L. Resolve any loan before initiating the rollover paperwork.

Edge cases: deployment timing, Roth TSP, and surviving-spouse rules

Three edge cases come up often enough in military tax-clinic settings to deserve explicit mention.

Contributions made during a partial-month deployment. If the service member served any part of a calendar month in a designated combat zone, the entire month’s pay qualifies for the IRC §112 exclusion (enlisted and warrant officers). A TSP contribution made on a paycheck dated within that month is combat-zone basis even if the deployment ended on day 3 of the month. The W-2 code Q figure is the authoritative source for the year’s combat-zone pay total.

Roth TSP contributions made from combat-zone pay. These have no basis-tracking layer because the entire Roth account is already after-tax. The only consideration is the Roth IRA 5-year clock at rollover: the clock on the Roth IRA destination starts at the first contribution to that Roth IRA, not at the first Roth TSP contribution.

A 60-year-old with 30 years of Roth TSP contributions may still face a 5-year clock on the receiving Roth IRA if it is newly opened. IRS Publication 590-B covers the 5-year rule in detail.

Surviving-spouse rollover of a service member’s TSP. A surviving spouse who inherits a TSP balance with combat-zone basis can elect to treat the inherited balance as their own and roll it to an IRA. The basis travels with the rollover. The spouse files Form 8606 (or executes the split-rollover) to preserve the basis.

Non-spouse beneficiaries face the SECURE Act 10-year distribution rule (rises to 75 in 2033 for the underlying RMD age), which interacts with basis recovery in ways that warrant tax-advisor input.

For the broader rollover context, including the once-per-12-months indirect-rollover rule from Bobrow v. Commissioner and the standard timeline, see our guide on moving a 401(k) to a gold IRA without penalty.

Does the combat-zone basis affect the choice of IRA custodian?

Yes, materially. Not every self-directed IRA custodian processes a split-rollover correctly. The custodian must accept two separate inbound transfers from the TSP. It must route the basis to a Roth IRA account and the pre-tax portion to a Traditional IRA account. It must also document both transactions so the IRS can later verify the Box 5 basis traveled correctly.

Some custodians refuse split-rollovers and require the participant to roll the full balance to one account first. The participant then executes a separate Roth conversion of the basis portion afterward. This works but adds an extra tax filing year.

Before selecting a custodian, ask:

• Do you accept a split-rollover directly from the TSP under IRS Notice 2014-54?
• Will you open both a Roth IRA and a Traditional IRA in the same application?
• How do you document the inbound basis amount on the Roth IRA side for IRS audit purposes?
• Do you support purchasing separate metals lots for the two accounts at a single depository?

A custodian that hesitates on any of these is the wrong custodian for a combat-zone-basis rollover. The standard TSP-to-gold-IRA process for federal employees, including the seven-step direct rollover sequence, is covered in our TSP rollover guide. The operators we rule out for 2026 are catalogued separately with the BBB and CFTC actions behind each verdict.

Frequently asked questions on combat-zone basis and gold IRA rollovers

Can I roll combat-zone Traditional TSP basis to a Roth gold IRA without paying tax?

Yes, under IRS Notice 2014-54. The combat-zone basis is already after-tax money for federal income tax purposes, so directing it to a Roth IRA in a coordinated split-rollover triggers no additional tax. The pre-tax portion of the same Traditional TSP balance is routed simultaneously to a Traditional IRA.

Both transactions appear on a single Form 1099-R from the TSP. The basis amount appears in Box 5. The taxable amount in Box 2a remains at $0 because the basis goes to Roth and the pre-tax portion goes to Traditional. Consult your tax advisor for your specific situation.

What happens to combat-zone basis if I do not file Form 8606 at the rollover year?

The basis is not legally lost, but the burden of proof shifts to you. On any future distribution from the receiving Traditional IRA, the IRS default assumption is that the entire distribution is pre-tax ordinary income.

To recover the basis you must file Form 8606 retroactively, attach the relevant 1099-R forms from the TSP showing the Box 5 figure, and reconcile the basis recovery under the pro-rata rule of IRC §408(d)(2).

A late Form 8606 carries a $50 penalty per missed year under IRC §6693, which the IRS generally waives for reasonable cause but does not waive automatically.

Does Roth TSP from combat-zone pay need any special handling at rollover?

No. Roth TSP contributions, whether or not they originated from combat-zone tax-exempt pay, are already in the Roth tax bucket. Rolling Roth TSP directly to a Roth IRA preserves the qualified-withdrawal treatment as long as the receiving Roth IRA’s 5-year clock is satisfied. No Form 8606, no split-rollover, no basis-tracking layer applies.

The only watch-out is the 5-year clock on the receiving Roth IRA, which may or may not match the clock on the original Roth TSP. IRS Publication 590-B covers the rule in detail.

If I missed declaring combat-zone basis on past TSP contributions, can I correct it now?

Possibly. The W-2 code Q figure for each qualifying year is the authoritative basis source. If the TSP recorded the contribution as a regular Traditional contribution rather than as combat-zone basis, you may be able to retroactively reclassify by contacting the TSP with W-2 documentation. The window for correction depends on the specific year and the TSP’s recordkeeping policy.

For tax-clinic-level recovery situations, consult a tax advisor familiar with military retirement accounts; the Volunteer Income Tax Assistance program on installations is often a first stop.

How does the SECURE Act 2.0 affect combat-zone basis on inherited IRAs?

The SECURE Act 10-year distribution rule applies to non-spouse beneficiaries of inherited IRAs. The combat-zone basis travels with the inherited IRA and is recovered pro-rata across the 10-year distribution window under the same IRC §408(d)(2) rule.

The basis is not subject to ordinary income tax, but the pre-tax portion is, and the distribution schedule is compressed compared to a spousal rollover. Surviving-spouse beneficiaries can elect to treat the inherited TSP as their own, which preserves the original distribution timeline and the basis recovery pace.

The interaction with the SECURE Act 2.0 RMD age (73 currently, rising to 75 in 2033) is best discussed with a tax advisor before making the spousal-vs-beneficiary election.

Sources cited

1. IRC §408(d)(2), Determination of Amount of Deductible Contributions Allowable for IRA (Pro-Rata Rule)
2. IRS Form 8606, Nondeductible IRAs (basis tracking for traditional IRA distributions)
3. IRC §6693, Failure to Provide Reports on Certain Tax-Favored Accounts (§50 penalty for missed Form 8606)
4. IRS Publication 590-B, Distributions from Individual Retirement Arrangements (IRAs), Roth 5-Year Rule
5. SECURE Act 2.0 of 2022 (P.L. 117-328), RMD Age Changes (73 in 2023, 75 starting 2033)