Roth TSP vs Roth IRA: Where Should Your Next Dollar Go?

I didn't max my TSP until I was a senior captain, and it didn't happen by accident. It took living well below my means, being ruthless about where every dollar went, and a few side hustles to push the savings rate up.

Somewhere along that road you hit the question this post is about. Roth TSP or Roth IRA? Match first, or IRA first? The military adds a wrinkle: BRS matching, tax-free allowances, and sometimes a deployment that changes the tax math. This is Part 1 of 2.

BLUF: Which one should you fund first?

If you're eligible for the Blended Retirement System (BRS) match, contribute enough to TSP to get the full match first. That's free money, and an IRA can't give it to you. After that, the choice comes down to what you want from your next dollar: low cost and simplicity (Roth TSP) or flexibility and choice (Roth IRA). You can, and often should, use both. And if you deploy, the math can flip. More on that below.

Part 2 is the one I'm most excited about: what it would actually take to turn a military career into a million dollars. This post lays the foundation.

Roth TSP vs Roth IRA, side by side

"Roth" means you pay the tax now, and qualified withdrawals come out tax-free later, earnings included. Qualified generally means 59½ or older and past a five-year clock. The account wrapped around it changes everything else, and the table is the whole story in seven lines.

Where the BRS match fits

Right at the front of the line. Here's how BRS works. Your service puts in an automatic 1% of basic pay after 60 days. Matching starts in your third year of service. The first 3% of pay you contribute is matched dollar for dollar. The next 2% is matched at 50 cents on the dollar. Put in 5% and your service adds 4% on top of the 1%, for 5% total. It all runs through your 26th year. An IRA contribution triggers none of it.

Here's what that looks like in real money. In 2026, an E-5 with over four years of service earns $3,946.80 a month in basic pay.

• Contribute nothing and you skip a match worth about $158 a month, close to $1,900 a year.
• Contribute 3% (about $118 a month) and you leave about $39 a month on the table, roughly $474 a year. That last 2% of your own pay earns a 50% instant return.
• Contribute 5% (about $197 a month) and you've captured the full match.

One more detail. All of that government money lands in Traditional TSP, even if every dollar you contribute yourself is Roth.

When BRS rolled out, I had the choice to switch. I stayed with High-3, so I've never had a TSP match. That's why “get the match first” is advice for BRS members, not a step everyone can take. If you're in High-3 too, your starting point is how much you can save and where that money should go. Model your retirement with your own career details, then look at the TSP and IRA choices below. We covered the funds and BRS matching in our TSP guide.

My take

With a real cash cushion, my default is Roth TSP. The costs are about as low as they get, there's far more contribution room than an IRA gives you, and payroll makes it automatic. I use a Roth IRA when I want to pick individual stocks or keep more flexibility to access cash if I need it. Its room is a fraction of TSP's, since the IRA limit is roughly a third of the TSP limit.

It wasn't always that way. I didn't buy my first individual stock until 2017. I've spent the years since learning how to invest, and just as much, what my risk tolerance actually is. Those two grow together. If you're new to this, starting with index funds isn't a weakness. It's how you build the stomach for the rest.

So if you're an E-4 staring at a $24,500 limit and thinking that's not happening, you're not behind. Get the match. Build the cushion. Raise the number a notch whenever pay, a promotion, or a deployment gives you room. Maxing is a destination, and you get there in steps.

When a Roth IRA is the better next stop

Say you've got the full match, a real emergency fund, and room in the budget. A Roth IRA earns a look if you want to buy something TSP doesn't offer, like individual stocks, or want more access to cash if a PCS or separation goes sideways.

A wider menu is only a benefit if you use it for something you actually need. Costs compound against you the same way returns compound for you, and TSP's are hard to beat. For plenty of service members the right IRA investment is one low-cost index fund, which TSP already offers.

A Roth IRA is also not a substitute for cash in a savings account. Selling investments in a bad market to fix a car turns a temporary problem into a permanent loss. Still, the ordering rules give an IRA a kind of flexibility Roth TSP doesn't have. Regular Roth IRA contributions come out first, ahead of conversions and earnings, so you can generally withdraw the money you put in without tax or penalty. That does not mean every dollar in the account is available penalty-free whenever you want.

To be fair to TSP, it has its own safety valves. You can take a general purpose loan against your balance and pay yourself back with interest, and hardship withdrawals exist for real emergencies. If you separate with a loan outstanding, you can continue making scheduled repayments directly. Miss the repayment deadline set by TSP, though, and the unpaid balance can become a taxable loan offset. That matters if a transition is on the horizon.

The 2026 IRA limit is $7,500, or $8,600 if you're 50 or older, subject to taxable compensation and Roth income rules. It covers your Traditional and Roth IRAs combined, and it doesn't use up any of your TSP room.

When more Roth TSP makes sense

You've got the match and you want to save more than the IRA limit allows. Sending the next dollars through payroll is simple. No second account. No transfer to remember at the end of a long week.

The 2026 employee deferral limit is $24,500, before any catch-up. Roth and Traditional TSP contributions share it, and your service's BRS contributions don't count against it. Another workplace plan through civilian work shares that limit too, so check before assuming you get a fresh one.

There's also the high-income case. Roth IRA contributions phase out by income. Roth TSP has no income gate, so if you can't contribute to a Roth IRA directly, Roth TSP is still open to you.

What a deployment changes

This is the military-specific part, and it can flip the whole decision. Pay you earn in a combat zone tax exclusion (CZTE) area isn't taxed. Here's why that matters for TSP.

Two limits, different jobs in 2026. The $24,500 employee deferral limit covers Roth TSP and ordinary Traditional TSP contributions, before any applicable catch-up. Traditional contributions from tax-exempt combat pay can go beyond that limit. The $72,000 annual additions limit covers total TSP contributions, including money from your service.

• Roth TSP from tax-exempt pay. You pay no income tax on the way in, and qualified earnings come out tax-free later. That's hard to beat, but Roth contributions still use employee deferral room.
• Traditional TSP from tax-exempt pay. These contributions do not use employee deferral room, which can let a deployed member save more. The contributions come out tax-free, but the earnings on them are taxable, and TSP pays withdrawals out pro rata from your taxable and tax-exempt balances. That's the tradeoff against Roth.
• IRAs. Under the HERO Act, nontaxable combat pay counts as compensation for IRA contributions, so a deployment doesn't have to shut you out of an IRA.

Officers: your exclusion is capped each month, so don't assume all of your pay qualifies. Check your LES and the TSP and IRS guidance before you set a number.

What if Traditional TSP beats both?

This is the question the Roth-versus-Roth debate buries. If your tax rate now is high and you expect a lower one in retirement, Traditional TSP can come out ahead because it lowers your taxable income today. If your rate now is low, paying the tax up front for Roth treatment looks better. Nobody knows their future rate, and military pay makes it murkier. BAH and BAS are already tax-free, so your bracket may be lower than your total compensation suggests. That tilts toward Roth.

An officer with a working spouse can land in a very different place than a single junior enlisted member. Same uniform. Different tax picture. Don't copy a stranger's percentage and call it a plan.

Try different Roth and Traditional splits in the TSP Calculator. It models both buckets and puts the BRS match in Traditional, the way it works in real life. It shows projected balances, not an after-tax forecast, and it doesn't model a separate IRA, so use it for the TSP side of the decision.

Quick guide: where does your next dollar go?

• In BRS and not getting the full match yet: TSP, up to 5%. Capture the match first.
• Match captured, no cash cushion: Build the cushion before adding anything else.
• Match captured, cushion built, want simple and cheap: More Roth TSP through payroll.
• Want individual stocks or more access to cash if needed: Roth IRA.
• Too much income for a direct Roth IRA: Roth TSP.
• Deploying or in a combat zone: Look hard at Roth TSP and tax-exempt contributions before you leave.
• In a high bracket now: Run Traditional against Roth before assuming Roth wins.

A decision you can make this week

Open your LES or TSP account and check your contribution rate. If you're BRS-eligible, make sure you're getting the full match. Then decide what the next dollar needs to do: give you flexibility and choice, or give you low-cost, automatic saving. Check the IRA income rules and both annual limits before you set an amount, and read the CZTE guidance if orders are coming.

Here's the thing. The biggest mistake I see isn't picking the wrong Roth. It's waiting for the perfect answer while nothing extra goes in. You can change the split later. Get the match, automate the next dollar, and fix the details when you have the time.

Up next in Part 2: what it would actually take for a service member to turn a military career into a million dollars, with real numbers, real stories, and the pension as the second leg.

Ready to test the TSP side of your plan? Run your numbers in the Salute to Suit TSP Calculator, then decide what you want your next dollar to do.

Data sources

Checked October 3, 2026.

• IRS: 2026 retirement-plan and IRA limits
• IRS: Roth IRA contribution limits
• IRS: Roth IRA distribution ordering rules
• IRS: designated Roth account withdrawal rules
• IRS Publication 3: Armed Forces' Tax Guide
• IRS: combat zone service provisions
• FRTIB: TSP 2025 administrative expense review
• DoD: BRS defined-contribution fact sheet
• DFAS: 2026 enlisted basic pay table
• DoD: BRS opt-in history
• TSP loan repayment regulations