If you spot TSA on your paycheck, it’s a Tax-Sheltered Annuity deduction: money moving from your salary into a 403(b) retirement account before federal and state income tax are calculated. It’s voluntary, you or your HR office set it up during enrollment, and it’s the nonprofit-sector counterpart to a 401(k). Public schools, universities, hospitals, charities, and churches use these plans.
What the Deduction Is Doing to Your Pay
Tax-Sheltered Annuity is the original name for what the IRS now calls a 403(b) plan, after the section of the Internal Revenue Code that created it. The traditional version comes out of your gross pay before your employer calculates income tax withholding, so every dollar you contribute reduces your taxable wages dollar for dollar in the current year. Earn $60,000, contribute $6,000, and your W-2 will report $54,000 in taxable wages. You don’t report the contribution separately on your return; the reduction is already baked into the W-2.
One detail catches people off guard. Social Security and Medicare taxes still apply to the full amount of your salary, including the portion going into the 403(b). Your employer calculates the 6.2% Social Security tax and the 1.45% Medicare tax on your gross pay, not on the reduced figure. Income tax drops right away; FICA withholding doesn’t. So your take-home pay falls by less than the full contribution amount, but not by as little as a straight tax-rate multiplication would suggest.
The money in the account grows without being taxed until you withdraw it in retirement. Investment options inside a 403(b) are generally limited to annuity contracts and mutual funds, which is one of the main differences from a 401(k), where the menu can be broader.
Why You’re Seeing TSA and Not 401(k)
Only certain employers can offer a 403(b). The eligible group is public schools, state colleges and universities, 501(c)(3) tax-exempt organizations such as charities and hospitals, and churches or religious organizations. If TSA is on your stub, your employer sits in one of those categories. Workers at private for-profit companies won’t see this line because those employers use 401(k) plans instead. If you moved from a private-sector job to a school or hospital, the TSA deduction is doing the same job your old 401(k) deduction did.
The deduction is also voluntary. Seeing it means you signed a salary reduction agreement, or one was set up for you during onboarding. It isn’t a tax the government requires; it’s savings you elected.
What If Your Stub Says Roth TSA
Many 403(b) plans now offer a designated Roth account alongside the traditional pre-tax option. If the line reads something like “Roth TSA” or “R403B,” your contributions are going in after tax has been withheld. There’s no tax break this year, but qualified withdrawals in retirement come out completely tax-free, including all the investment earnings.
To get that tax-free treatment, two conditions apply: your first Roth contribution must have been made at least five tax years ago, and you must be at least 59½, disabled, or deceased (in which case the benefit passes to your beneficiary). If you withdraw before meeting both, you’ll owe income tax on the earnings portion. You always get your original contributions back tax-free because you already paid tax on them.
A few practical points if you’re comparing the two. Only your own elective deferrals can go into the Roth account; any employer match goes into a separate pre-tax account regardless of your election. Once you designate a contribution as Roth, you can’t reclassify it as pre-tax later. And starting in 2024, Roth 403(b) balances are no longer subject to required minimum distributions during your lifetime, while traditional pre-tax balances still are.
How Much Can Come Out of Your Paycheck in 2026
The IRS adjusts 403(b) contribution limits each year for inflation. For 2026:
- Base elective deferral: $24,500, up from $23,500 in 2025.
- Standard catch-up at age 50 and older: an additional $8,000, for a total of $32,500.
- Super catch-up at ages 60 through 63: an $11,250 catch-up instead of the standard $8,000, for a total of $35,750. This comes from a SECURE 2.0 change.
- 15-year service catch-up: employees with at least 15 years at the same qualifying organization can add up to $3,000 per year, capped at $15,000 over a lifetime. Qualifying organizations include educational institutions, hospitals, home health service agencies, health and welfare service agencies, and churches.
- Combined annual addition limit: total contributions from all sources, including any employer match, can’t exceed $72,000 or 100% of your compensation, whichever is less.
The 15-year catch-up and the age-based catch-up can stack in the same year. When both apply, contributions count toward the 15-year catch-up first, then toward the age-based limit. Someone age 60 with 15 years at a qualifying hospital could theoretically defer $24,500 plus $3,000 plus $11,250.
Employer Match and Vesting
Some employers match a percentage of your contributions or make flat contributions on your behalf. Those dollars sit on top of your own deferrals and count toward the $72,000 combined limit, not your $24,500 individual cap.
Your own contributions are always 100% yours. Employer contributions may be subject to a vesting schedule, meaning you earn ownership gradually. Federal law requires one of two structures:
- Cliff vesting: you own nothing until you complete three years of service, then become 100% vested all at once.
- Graded vesting: 20% ownership after two years of service, increasing 20% each year until you’re fully vested after six years.
Leave before you’re fully vested and you forfeit the unvested portion of employer contributions. Your own money and its earnings go with you regardless.
Changing or Stopping the Deduction
Because the TSA line is voluntary, you can change the amount or stop it entirely by submitting a new salary reduction agreement to your employer. The change takes effect on future paychecks once processed. How often you can adjust varies by plan. Some allow changes anytime, others restrict them to enrollment windows or require advance notice before the next pay period. Your HR or benefits office can spell out the process and timing.
Stopping contributions doesn’t trigger tax consequences or penalties. Your existing balance stays in the account under the same investment and withdrawal rules, and you can restart later with a new agreement. If the goal is retirement savings, small increases over time compound, so treating a pause as temporary usually serves you better than making it permanent.
One Boundary Worth Knowing
Money going into a traditional 403(b) is locked away for retirement. Withdrawals before age 59½ generally owe income tax plus a 10% early withdrawal penalty. Some plans allow loans up to 50% of your vested balance or $50,000 (whichever is less), and some allow hardship withdrawals for specific needs such as medical bills, a primary home purchase, tuition, eviction or foreclosure prevention, funeral costs, or certain home repairs. If you separate from your employer during or after the year you turn 55, you can access the account penalty-free. Don’t treat the TSA deduction as a savings account you can dip into casually; the point of the tax break is that the money stays put.