What should I prioritize during CZTE months, contributions or conversions?

Roth TSP contributions from CZTE pay come first. That money was never taxed, grows tax-free, and comes out tax-free, the cleanest outcome in the tax code. Conversions of your existing Traditional balance come second, sized to fill the standard deduction and low brackets.

Deployed? Your CZTE Months Are a Roth Conversion Window

Q: Is a TSP Roth conversion tax-free if I do it while deployed in a combat zone?

No, and this is the most common version of the myth. CZTE excludes your military compensation from income; a conversion is a retirement account transaction and is ordinary income regardless of where you are. The strategy works because CZTE zeroes out your other taxable income, so the conversion fills the standard deduction and low brackets instead of stacking on top of a salary.

Q: Why is my TSP match in Traditional when I contribute 100% Roth?

By law, all BRS agency and service matching contributions go to Traditional TSP regardless of your own election. Every BRS member who contributes builds a Traditional balance whether they want one or not.

Q: Can I convert my Traditional TSP match to Roth inside TSP?

Yes, since January 28, 2026 TSP offers in-plan Roth conversions. The minimum per conversion is $500 and you can run up to 26 per year. The converted amount is taxable income in the conversion year, paid from outside funds since TSP does not withhold from the converted balance.

Q: How much Traditional money does the BRS match actually build?

An E-5 over 4 years contributing 5% earns about $2,265 a year in match at 2026 pay rates. Over a 4-year enlistment that's roughly $9,060 of Traditional TSP, all of it fully taxable at withdrawal plus subject to required minimum distributions later.

Q: Do conversions of contributions I made from combat-zone pay get taxed again?

The tax-exempt basis does not. If part of your Traditional balance came from CZTE contributions, that basis converts tax-free; only the earnings on it are taxable. TSP applies the split proportionally.

Last Updated: July 22, 2026 Reading Time: 8 min

Almost every Blended Retirement System member hits the same surprise eventually: you set your TSP to 100% Roth, then years later discover a Traditional balance you never asked for. That's your match. By law it always lands in Traditional. And if a deployment is on your calendar, you may be looking at the cheapest chance you'll ever get to fix it, as long as you understand what the combat-zone exclusion actually does and doesn't cover.

Your BRS match is always Traditional, no matter your own Roth election. An E-5 contributing 5% builds roughly $9,060 of Traditional TSP over a 4-year enlistment.
A conversion during CZTE months is not tax-free. The Combat Zone Tax Exclusion covers your military compensation, not retirement account transactions.
The strategy still works: with your pay excluded, your taxable income starts near $0, so a conversion fills the $16,100 standard deduction and the 10% and 12% brackets instead of stacking on a salary at 22%.
Priority order during deployment: max Roth TSP contributions from CZTE pay first (never taxed, ever), then convert Traditional dollars up to your bracket target.
TSP added in-plan Roth conversions on January 28, 2026: $500 minimum, up to 26 per year, tax paid from outside funds.

The Traditional balance you didn't choose

Under BRS, your service matches up to 5% of basic pay: 1% automatic plus up to 4% matching. Every dollar of it goes to Traditional TSP by statute, regardless of whether your own contributions are Roth.

The math on a typical enlistment: an E-5 over 4 years earns $3,775.80 a month in 2026 basic pay. Contributing 5% draws the full match, about $2,265 a year. Four years of that is roughly $9,060 of pre-tax money, plus growth, sitting in an account you'll pay ordinary income tax on in retirement, complete with required minimum distributions in your 70s.

For a dual-income or dual-pension household, that RMD problem compounds. Retirees with two pensions and Social Security routinely find their "small" Traditional balances forcing taxable withdrawals they don't need at rates they didn't plan for.

What CZTE actually does (and the myth to drop)

The Combat Zone Tax Exclusion (IRC section 112) excludes compensation for active service in a designated combat zone from your gross income: basic pay, hostile fire pay, reenlistment bonuses signed in the zone. For enlisted members, the exclusion is unlimited.

The internet version of this strategy says "convert your TSP while deployed and pay 0% because you're in a combat zone." That's wrong on the mechanics. A Roth conversion is not compensation for active service. It's a retirement account transaction, and the converted amount is ordinary income in the year of conversion no matter where you're stationed.

So why does the strategy still work? Because tax brackets don't care where income comes from, only how much of it there is. In a normal year, a conversion stacks on top of your salary and gets taxed at your top rate, 22% or worse. In a CZTE year, your military income is excluded, so your taxable income starts at or near zero. The conversion fills the empty space:

2026 single filer, full-year CZTE	Amount	Tax on it
Standard deduction	first $16,100	$0
10% bracket	next $12,400	$1,240
12% bracket	up to $48,475 taxable	12 cents on the dollar

Convert $16,000 of Traditional TSP in a full-CZTE year and the federal tax bill can be zero, not because the conversion was excluded, but because it landed entirely inside your standard deduction. Convert $9,060 (the 4-year match) and you're at $0 federal tax with room to spare. The same conversion in a normal E-5 year would cost about $1,993 at 22%.

One more sweetener: if part of your Traditional balance came from contributions you made from CZTE pay on a previous deployment, that money carries tax-exempt basis. When you convert, the basis portion converts tax-free; only its earnings are taxable. TSP applies the split proportionally.

The priority order that beats converting

Before you convert anything, fund the cleaner play. Roth TSP contributions made from CZTE pay are the single best tax outcome available to anyone: the money was never taxed going in, grows tax-free, and comes out tax-free at retirement. Nothing a civilian or a fed can do matches it.

So the deployment sequence is:

Max your Roth TSP contributions from excluded pay first. The elective deferral limit applies, but deployed members contributing to a Traditional account can go beyond it up to the annual additions limit; for the Roth side, fill your elective room.
Then convert Traditional dollars, sized to your bracket target. Filling just the standard deduction is free. Filling through the 12% bracket costs 10 to 12 cents per dollar, still less than half the normal price.
Pay the conversion tax from cash, not TSP. TSP doesn't withhold from the converted amount, and paying from the account would shrink the very balance you're optimizing.

The mechanics, since January 28, 2026: log in to My Account, request an in-plan Roth conversion, $500 minimum, up to 26 conversions a year. The converted amount lands on a 1099-R as ordinary income for the year.

Run the long-term difference between a Traditional-heavy and Roth-heavy balance with our TSP Calculator, and if you're weighing BRS decisions more broadly, the BRS vs High-3 Calculator covers the retirement-system side.

Timing details that change the math

CZTE works by months, not days. One qualifying day in a month excludes that entire month's pay. A deployment spanning October through March gives you exclusion months in two tax years, two shots at low-bracket conversions.
Partial-year deployments still help. Six CZTE months cuts your annual taxable income roughly in half, which may put a modest conversion in the 12% bracket instead of the 22%.
State taxes are separate. Several states tax conversions even when federal tax is zero, and several exempt military income entirely. Check yours before sizing the conversion.
Don't convert past your target bracket. The goal is filling cheap space, not emptying the Traditional account in one year. Unused room next deployment is fine.

Frequently Asked Questions

Is a TSP Roth conversion tax-free if I do it while deployed in a combat zone?

No. CZTE excludes military compensation, and a conversion isn't compensation. It's taxable ordinary income wherever you are. The strategy works because your excluded pay leaves the standard deduction and low brackets empty for the conversion to fill.

Why is my TSP match in Traditional when I contribute 100% Roth?

By law, all BRS matching and automatic contributions go to Traditional TSP regardless of your election.

Can I convert my Traditional TSP match to Roth inside TSP?

Yes, since January 28, 2026: $500 minimum per conversion, up to 26 a year, taxable in the conversion year, with tax paid from outside funds.

What should I prioritize during CZTE months?

Roth TSP contributions from excluded pay first; they're never taxed at any point. Conversions second, sized to your bracket target.

How much Traditional money does the BRS match actually build?

About $2,265 a year for an E-5 over 4 contributing 5% at 2026 rates, roughly $9,060 over a 4-year enlistment, before growth.

Do conversions of contributions I made from combat-zone pay get taxed again?

The tax-exempt basis converts tax-free; only its earnings are taxable. TSP prorates the split.

Your BRS Match Always Goes Traditional: The rule that creates the balance this post converts
TSP Calculator: Model Traditional vs. Roth balances to retirement
BRS vs High-3 Optimization: The bigger retirement-system picture
Military Buyback Calculator: If federal civilian service is in your future

Sources: IRC section 112 (combat zone exclusion), TSP: Roth in-plan conversions, IRS Publication 3, Armed Forces' Tax Guide, DFAS 2026 military pay tables.