The average American retires with less than $88,000 saved. The biggest reason isn't lack of income — it's not using the right tax-advantaged accounts. An IRA can cut your lifetime tax bill by tens of thousands of dollars, but only if you pick the right type.
Roth and Traditional IRAs both let you invest in stocks, bonds, and funds. The difference is when you pay taxes. That single distinction can mean the difference between retiring with $500,000 or $650,000 on the exact same contributions.
How Each Account Works
Traditional IRA
You contribute pre-tax dollars (if you qualify for the deduction), your investments grow tax-deferred, and you pay ordinary income taxes when you withdraw in retirement.
- Contributions may be tax-deductible now, reducing this year's tax bill
- Growth is tax-deferred — you don't pay tax year to year on gains
- Withdrawals in retirement are taxed as ordinary income
- Required minimum distributions (RMDs) start at age 73
Roth IRA
You contribute after-tax dollars, your investments grow tax-free, and qualified withdrawals in retirement are completely tax-free — including all the gains.
- No tax deduction on contributions
- Growth is entirely tax-free
- Qualified withdrawals in retirement are tax-free
- No required minimum distributions during your lifetime
Key Differences at a Glance
| Feature | Traditional IRA | Roth IRA |
|---|---|---|
| Tax on contributions | Pre-tax (deductible if eligible) | After-tax (no deduction) |
| Investment growth | Tax-deferred | Tax-free |
| Withdrawals in retirement | Taxed as ordinary income | Tax-free |
| 2025 contribution limit | $7,000 ($8,000 age 50+) | $7,000 ($8,000 age 50+) |
| Income limit to contribute | None (deduction phases out with workplace plan) | Phases out $150k–$165k single, $236k–$246k married |
| Required minimum distributions | Yes, starting at age 73 | No |
| Early withdrawal (before 59½) | 10% penalty + taxes on full amount | 10% penalty on earnings only; contributions always accessible |
When the Roth IRA Wins
You're early in your career or in a low tax bracket now. If you're paying 12% or 22% federal tax today but expect to be in the 32% bracket when you retire, you're better off paying tax now at the lower rate. Locking in today's rate is like buying future tax-free income at a discount.
Example: Contributing $7,000/year to a Roth at age 25, assuming 7% annual returns and retiring at 65:
- The account grows to approximately $1.37 million either way
- Traditional IRA: every withdrawal is taxed as income. At 22%, that's roughly $300,000 in taxes over a 25-year retirement.
- Roth IRA: $0 in taxes. You keep every dollar.
You want withdrawal flexibility. Roth contributions — not earnings — can be withdrawn at any time without penalty or tax. This makes a Roth IRA a natural backup emergency fund. The Traditional IRA has no such flexibility; every dollar taken out before 59½ triggers a 10% penalty plus income tax.
You want to skip required minimum distributions. If you have other retirement income and don't need to draw from your IRA, the Roth lets you leave it untouched indefinitely — or pass it to heirs income-tax-free. With a Traditional IRA, you're forced to start withdrawals at 73 whether you need the money or not, which can push you into a higher tax bracket.
You expect tax rates to rise. If you believe Congress will increase income tax rates in the coming decades — a reasonable assumption given long-term fiscal pressures — paying today's rate is a hedge against that outcome. You're locking in a known cost.
When the Traditional IRA Wins
You're in a high tax bracket now. If you're in the 32%, 35%, or 37% bracket today, the upfront deduction is worth a lot. A $7,000 deduction at 35% saves you $2,450 immediately. If you retire in a lower bracket, say 22%, you come out ahead on every dollar contributed.
Example: Earning $200,000 today (32% bracket), retiring on $70,000/year (22% bracket):
- The Traditional IRA deduction saves 32 cents per dollar contributed today
- Withdrawals are taxed at 22 cents per dollar in retirement
- Net advantage: 10 percentage points per dollar — real money on $7,000/year compounded over 20+ years of contributions
You need to reduce taxable income right now. If you're close to a bracket threshold, or trying to qualify for a credit or deduction that phases out at a certain income level, an IRA deduction can push your adjusted gross income below the line.
You're over the Roth income limit. Single filers earning above $165,000 and married filers above $246,000 cannot contribute directly to a Roth IRA. A non-deductible Traditional IRA is still available, as is the backdoor Roth strategy (see below).
The Backdoor Roth: An Option for High Earners
If your income disqualifies you from a direct Roth IRA contribution, you can still access Roth benefits through a two-step process:
- Contribute to a non-deductible Traditional IRA (no income limit applies)
- Convert that balance to a Roth IRA and pay income tax on any gains
This is legal, widely used, and well-documented in IRS guidance. You owe income tax only on earnings between contribution and conversion — typically minimal if you convert promptly. One caveat: if you have other pre-tax IRA balances, the "pro-rata rule" may increase your tax bill on the conversion. Run the numbers with a tax advisor before proceeding.
Can You Have Both?
Yes — but the $7,000 annual limit ($8,000 if you're 50 or older) applies to your total IRA contributions across all accounts combined. You can split contributions between a Roth and a Traditional IRA in any proportion you like, but the combined total can't exceed $7,000.
Most financial advisors recommend picking one type and maxing it out, then supplementing with a 401(k), rather than splitting contributions between both IRAs. Simpler is better when both approaches are close in value.
How to Choose: A Simple Framework
- What is your current federal tax bracket? Check your last tax return — it's the most important input.
- What do you expect to pay in retirement? Estimate based on projected Social Security income, any pension, and planned withdrawal amounts.
- Current bracket lower than expected retirement bracket → Roth IRA.
- Current bracket higher than expected retirement bracket → Traditional IRA.
- Genuinely uncertain → default to Roth. Tax rates have historically trended upward over time. The Roth is more flexible, and decades of tax-free compounding are difficult to beat.
For most people under 50 who are in the 22% bracket or below, the Roth IRA is the better long-term choice. The math and flexibility both point the same direction.
Use our Retirement Calculator to model your projected balance under both Roth and Traditional contributions, and see how the different tax treatments affect your actual retirement number.
The Bottom Line
Both Roth and Traditional IRAs are powerful tools. The Roth wins when you're in a low-to-moderate bracket now, expect higher taxes later, or want tax-free income in retirement. The Traditional wins when you need the upfront deduction today and expect a lower tax rate when you ultimately withdraw.
If you're under 50 and not in the top two tax brackets, the Roth IRA is almost always the better bet. Start with the $7,000 annual contribution, invest in low-cost index funds, and let four decades of tax-free compounding do the heavy lifting.
→ Model your retirement savings in the Retirement Calculator