Combat Zone Roth TSP Supercharge: Tax-Free Pay Into Tax-Free Growth
Example: Monthly basic pay: 4000 $ · Hazardous duty / hostile fire pay (monthly): 225 $ · Combat zone deployment length: 9 months · TSP contribution during deployment: 60 % · Years until TSP withdrawal begins: 20 yrs · Expected TSP growth rate: 7 %/yr · Federal tax rate (for tax-saved calculation): 22 %
| Roth TSP future value of deployment contributions | $88,287 |
| Total Roth TSP contributed during deployment | $22,815 |
| Tax dollars saved during deployment | $8,366 |
| Monthly tax savings (CZTE) | $930 |
| Tax-free growth bonus vs Traditional TSP | $19,423 |
Worked example
A service member earning $4,225/month (basic + hazardous pay) on a 9-month combat deployment and contributing 60% to Roth TSP puts $22,815 into Roth TSP during that tour. At zero federal income tax on those contributions and 7% annual growth over 20 years, those deployment dollars grow to approximately $88,300 — all of it permanently tax-free at withdrawal. The tax savings alone (22% rate on $22,815) equal $5,019 during deployment, and the avoided future taxes on $88,300 add another $19,400 of economic value.
Frequently asked questions
What is the Combat Zone Tax Exclusion (CZTE)?
CZTE excludes all pay earned in a designated combat zone from federal income tax — including basic pay, special pays, bonuses, and re-enlistment bonuses received during service in the zone. For enlisted members and warrant officers, this exclusion is unlimited. For commissioned officers, the exclusion is capped at the highest enlisted pay plus hostile fire/imminent danger pay.
Can I exceed the normal TSP contribution limit during combat deployment?
Yes. Service members serving in combat zones can contribute more than the normal elective deferral limit (a combined $70,000 in 2025 including employer contributions), though Roth contributions are still capped at $23,500. Combat-zone contributions that exceed the Roth limit go into Traditional TSP. Consult your finance office for exact limits for your pay grade and deployment year.
Which combat zones qualify for CZTE?
Designated combat zones as of 2025 include Afghanistan (and airspace), Iraq, Kuwait, Saudi Arabia, Bahrain, Qatar, UAE, Oman, Jordan, Egypt, the Red Sea, the Gulf of Aden, the Gulf of Oman, the Persian Gulf, and parts of the Arabian Sea. The list is updated by executive order and DoD directive.
Is Roth TSP the right choice during deployment?
In most cases, yes. The CZTE means you pay zero federal income tax on the contributions — making the after-tax cost of Roth TSP identical to the after-tax cost of Traditional TSP during deployment. But Roth grows and is withdrawn tax-free, while Traditional is taxed at withdrawal. There is no tax downside to Roth during combat deployment; the only advantage is Traditional if you expect to be in a very low bracket in retirement.