Roth 403(b) Projections: Tax-Free Growth and Employer Match Rules
Use this guide to understand the assumptions, inputs, results, and next steps behind the calculator.
For educators, hospital workers, and non-profit employees, the Roth 403(b) offers a powerful way to build tax-free retirement income. Unlike a traditional pre-tax account, your contributions to a Roth 403(b) are made with after-tax dollars. You pay taxes now, but your investments grow tax-free, and your future withdrawals are completely shielded from federal income taxes.
This calculator projects your future account balance by separating your investments into two distinct buckets: your tax-free employee contributions and your taxable employer match. Because workplace plans have complex rules around how matching funds are treated, this tool helps you visualize your exact after-tax income in retirement. Whether you are setting your initial 403(b) contribution or modeling a long-term 403(b) withdrawal strategy, understanding how these two buckets compound is the key to accurate planning.
2026 Roth 403(b) Contribution Limits
The IRS sets strict annual limits on how much you can contribute to a 403(b) plan. These limits apply to your combined traditional and Roth contributions—you cannot contribute the maximum to both account types in the same year.
| Contribution Type | 2026 Limit | Notes |
|---|---|---|
| Standard Elective Deferral | $23,500 | Applies to all employees under age 50. |
| Standard Catch-Up (Age 50+) | $7,500 | Total allowed contribution: $31,000. |
| Super Catch-Up (Ages 60–63) | $11,250 | Created by SECURE 2.0. Total allowed contribution: $34,750. |
| Total Limit (Employee + Employer) | $70,000 | The absolute maximum that can enter your account from all sources (excluding age 50+ catch-ups). |
| 15-Year Service Catch-Up | Up to $3,000 | Unique to 403(b)s. Requires 15+ years with the same qualified employer. Lifetime cap of $15,000. |
If you are trying to aggressively fund your retirement, you might also explore the mega backdoor Roth strategy, which allows for massive after-tax contributions if your specific 403(b) plan rules permit it.
The Employer Match Rule: Why It Stays Pre-Tax
One of the most confusing aspects of a Roth 403(b) is how employer matching contributions are handled. When you use this calculator, you will notice that it separates your final balance into a "Roth (Tax-Free)" bucket and a "Traditional (Taxable)" bucket.
Historically, the IRS required all employer matching funds to be deposited into a pre-tax traditional account, even if your personal contributions were 100% Roth. This means that while your own contributions grow tax-free, your employer's contributions grow tax-deferred. When you retire, any withdrawals pulled from the employer match bucket will be subject to standard income taxes.
The SECURE 2.0 Act recently changed federal law to allow employers to offer matching contributions on a Roth basis. However, because this requires massive administrative overhauls for payroll providers, the vast majority of 403(b) plans still deposit employer matches into a pre-tax bucket. This calculator defaults to the standard rule: employer matches are treated as traditional pre-tax funds.
If you want your entire retirement balance to be tax-free, you will eventually need to execute a 401(k) or 403(b) to Roth IRA conversion on those matching funds, paying the taxes at the time of conversion.
Roth vs. Traditional 403(b): Deciding Your Tax Strategy
Choosing between a Roth and a traditional 403(b) comes down to a single question: Do you want to pay taxes on your seed (contributions today) or your harvest (withdrawals in retirement)?
| Feature | Roth 403(b) | Traditional 403(b) |
|---|---|---|
| Tax Treatment of Contributions | After-tax (no upfront deduction) | Pre-tax (lowers your taxable income today) |
| Tax Treatment of Withdrawals | 100% Tax-Free (if qualified) | Taxed as ordinary income |
| Best For... | Early-career employees, those expecting higher taxes in retirement, or super-savers wanting tax diversity. | Peak-earning professionals looking to lower their current tax bracket. |
| Impact on Take-Home Pay | Reduces paycheck more significantly | Reduces paycheck less (due to tax savings) |
Many financial planners recommend holding both account types. This strategy, known as tax diversification, gives you ultimate control over your retirement drawdown. In years when your income is low, you can pull from your traditional 403(b). In years when you need a large lump sum—perhaps for a medical expense or a new vehicle—you can pull from your Roth 403(b) without bumping yourself into a higher tax bracket.
If you aren't sure which path yields the highest net wealth, you can compare the mathematics in our guide on Roth vs. Traditional accounts.
The Math Behind Your Roth 403(b) Projection
To project your retirement readiness, this calculator runs a year-by-year simulation of your salary, contributions, employer match, and investment growth. It enforces IRS limits and separates your tax-free assets from your taxable assets.
Here is the core math the calculator applies:
1. Annual Employee Contribution
The calculator first determines how much you contribute based on your salary, capping it at the IRS limit.
Employee Roth Contribution = Minimum of (Projected Salary × Employee Contribution Rate) OR (IRS Contribution Limit)
Where:
- Projected Salary = Your current salary grown by your annual salary growth rate.
- Employee Contribution Rate = The percentage of your paycheck you elect to save.
- IRS Contribution Limit = $23,500 (or higher if you are eligible for catch-up contributions).
2. Employer Match Calculation
Next, the calculator determines your employer's pre-tax contribution based on their specific matching formula and salary cap.
Employer Traditional Contribution = Minimum of (Employee Roth Contribution × Employer Match Rate) OR (Projected Salary × Employer Match Cap)
Where:
- Employer Match Rate = The percentage your employer matches (e.g., 50% or 100%).
- Employer Match Cap = The maximum percentage of your salary eligible for the match (e.g., up to 6%).
3. After-Tax Retirement Income
When estimating your safe withdrawal amount in retirement, the calculator accounts for the different tax treatments of your two buckets.
Estimated After-Tax Withdrawal = Tax-Free Roth Withdrawal + (Taxable Traditional Withdrawal × (1 - Retirement Tax Rate))
Where:
- Tax-Free Roth Withdrawal = Your final Roth balance multiplied by your safe withdrawal rate.
- Taxable Traditional Withdrawal = Your final employer match balance multiplied by your safe withdrawal rate.
- Retirement Tax Rate = Your estimated federal income tax bracket during retirement.
Scenario: A Teacher Targeting Tax-Free Retirement Income
Let’s look at a realistic example of how a Roth 403(b) compounds over a career.
Sarah is a 35-year-old public school teacher earning $75,000 per year. She expects her salary to grow by 2.5% annually. She contributes 10% of her salary to her Roth 403(b), and her school district offers a 100% match on the first 6% of her salary. She plans to retire at 65 and expects a 7% annual investment return.
Her Annual Contributions at Age 35:
- Sarah’s Roth Contribution: $7,500 (10% of $75,000)
- Employer Traditional Match: $4,500 (6% of $75,000)
Because Sarah is a teacher, she will likely also receive a state pension. By using a Roth 403(b), she ensures that her investment withdrawals won't stack on top of her pension income and push her into a higher tax bracket. (Educators can model their pension benefits using a defined benefit pension calculator).
Her Projected Balances at Age 65:
- Roth Bucket (Tax-Free): ~$945,000
- Traditional Bucket (Taxable): ~$567,000
- Total Nominal Balance: ~$1.51 Million
When Sarah retires, she can safely withdraw 4% of her portfolio in her first year. Her Roth bucket provides roughly $37,800 in completely tax-free income. Her traditional bucket provides $22,680, which will be subject to taxes. By building a massive Roth balance, Sarah maintains strict control over her tax liabilities late in life.
Frequently Asked Questions
Quick answers to the questions people usually have after running the retirement calculator.
1What is a Roth 403(b)?
A Roth 403(b) is a workplace retirement account specifically for employees of public schools, tax-exempt organizations, and certain ministers. You contribute after-tax dollars, meaning you get no upfront tax deduction, but your investments grow tax-free and all qualified withdrawals in retirement are completely tax-free.
2Can I contribute to both a Roth 403(b) and a Roth IRA?
Yes. The contribution limits for a 403(b) and an IRA are entirely separate. In 2026, you can contribute up to $23,500 to a Roth 403(b) and an additional $7,000 to a Roth IRA, provided you meet the Roth IRA MAGI income limits.
3Do Roth 403(b) accounts have Required Minimum Distributions (RMDs)?
No. Thanks to the SECURE 2.0 Act, Roth 401(k) and Roth 403(b) accounts are no longer subject to lifetime Required Minimum Distributions starting in 2024. You can leave the money in your account to grow tax-free for your entire life. However, your pre-tax employer match bucket will still be subject to RMDs. Learn more in our guide on Required Minimum Distributions.
4Are Roth 403(b) withdrawals completely tax-free?
Yes, as long as the withdrawal is "qualified." To be qualified, you must be at least 59½ years old, and you must have held the Roth 403(b) account for at least five years. If you withdraw earnings before meeting these criteria, you may face taxes and a 10% early withdrawal penalty.
5What is the 15-year rule for 403(b) plans?
The 15-year rule is a special catch-up provision unique to 403(b) plans. If you have worked for the same qualified employer (like a school district or hospital) for at least 15 years, you may be eligible to contribute an extra $3,000 per year, up to a lifetime maximum of $15,000. This is completely separate from the standard age-50 catch-up contribution.
6What happens to my Roth 403(b) if I leave my job?
When you leave your employer, you can leave the money in the plan, roll it into a new employer's 401(k) or 403(b), or roll it into a Roth IRA. Rolling it into a Roth IRA is generally the most popular choice because it gives you broader investment options and avoids any future plan administrative fees.
Next Steps
Now that you have projected your Roth 403(b) balance, consider how it fits into your broader financial plan. If you are married, you should coordinate your withdrawals with your spousal Social Security benefits to ensure you aren't paying unnecessary taxes on your federal benefits.
If you are planning to leave a legacy for your children, you may also want to review how the inherited Roth IRA RMD rules will apply to the assets you pass down, as non-spouse beneficiaries must generally empty the account within 10 years. Finally, to see if your combined savings are enough to support your lifestyle, run your numbers through our comprehensive retirement calculator.