Every personal finance article on this topic reaches the same conclusion: "It depends on your tax bracket now vs. retirement." That's technically correct and practically useless. It's the equivalent of answering "should I buy a house?" with "it depends on what you can afford." You need specifics.
The 2026 IRA contribution limit is $7,000 ($8,000 if you're 50 or older). You have exactly one decision to make: does that $7,000 go into a Roth or Traditional IRA? The answer depends on your income, but not in the way most articles explain.
The Income Phase-Outs
In 2026, direct Roth IRA contributions phase out between:
- $150,000 and $165,000 for single filers
- $236,000 and $246,000 for married filing jointly
Above those upper limits, you cannot contribute directly to a Roth — only via the backdoor. Below the lower limits, you can contribute the full $7,000.
Traditional IRA deductibility phases out earlier for anyone with a workplace retirement plan:
- $77,000 to $87,000 for single filers
- $123,000 to $143,000 for married filing jointly
If your income exceeds those limits and you have a 401(k), your Traditional IRA contribution is non-deductible — it goes in with after-tax money, and you lose the tax advantage that makes it interesting in the first place.
The Real Decision Framework
For most earners, the question is binary:
- Above Traditional deductibility, below Roth phase-out: Roth (the only choice with a tax advantage)
- Below Traditional deductibility: compare brackets
- Above Roth phase-out: backdoor Roth (or skip the IRA entirely if you have 401(k) space)
The people who actually get to choose between Roth and Traditional IRA are those below $77K single or $123K married who have workplace plans. For them, the bracket analysis matters.
The Bracket Math
Traditional IRA: deduct $7,000 this year at your marginal rate. Pay ordinary income tax on withdrawals in retirement at your future marginal rate.
Roth IRA: pay tax on the $7,000 now at your marginal rate. Withdrawals in retirement are tax-free.
If your marginal rate is the same now and in retirement, the funds end up mathematically identical. Seriously — the math works out to the same dollar amount.
If you expect a higher bracket in retirement: Roth wins. You pay tax at today's lower rate.
If you expect a lower bracket in retirement: Traditional wins. You pay tax at retirement's lower rate.
Why Retirement Brackets Usually Drop
Most people earn more during peak working years (35-65) than in retirement. The combined household income at 50 is often $200K+. In retirement at 70, it might be $90K from Social Security plus portfolio withdrawals. The bracket usually falls.
Therefore, for most mid-to-high earners, Traditional often wins the pure bracket math. But there's a catch — Required Minimum Distributions (RMDs) can push retirement income higher than expected, especially if you have a large Traditional 401(k) balance.
The RMD Problem
Starting at age 73 (75 for those born after 1960), you must withdraw a percentage of your Traditional IRA each year, whether you need the income or not. At 73, the required percentage is about 3.8%. By 90, it's 8.8%. These forced withdrawals are taxable at ordinary income rates.
If your Traditional IRA balance is $2 million at age 73, that's a $76,000 first-year RMD. Combined with Social Security and any other income, you might be pushed into a higher bracket than you expected.
Roth IRAs have no RMDs during the owner's lifetime. Money grows tax-free forever. This "optionality" — the ability to not withdraw — has real value for high earners whose Traditional balance might otherwise force them into higher brackets late in life.
The Tax Rate Uncertainty
Federal tax rates are historically low. The Tax Cuts and Jobs Act of 2017 set rates that are scheduled to revert to higher levels in 2026 unless Congress extends them. Whether rates go up or down from here is a political question nobody can answer with confidence.
If you believe rates will rise, Roth wins. You lock in today's lower rate.
If you believe rates will fall, Traditional wins. You get a deduction at today's rate and withdraw at tomorrow's lower rate.
Diversification across tax treatments is the hedge. Owning some Traditional and some Roth protects against either outcome.
The Compounding Lie
Some articles argue "Roth compounds tax-free, so it's better." Traditional also compounds tax-free inside the account. The only tax event is at withdrawal. If you invest $7,000 at 7% for 30 years, both accounts show $53,300 before taxes. The difference is when (and how much) you pay tax.
The "tax-free compounding" argument is only meaningful if you expect tax rates to change. If rates are stable, compounding is identical.
Specific Income Level Recommendations
- Single, earning under $50K: Roth. You're in a low bracket that you'll likely exceed in retirement if you're saving seriously.
- Single, earning $50K-$77K, has 401(k): Mostly Roth. Bracket math is close to neutral; Roth gives RMD flexibility.
- Single, $77K-$150K, has 401(k): Roth is often only option (Traditional isn't deductible). Contribute Roth.
- Single, $150K-$165K: Roth, but watch the phase-out. Contribute partial if near the top.
- Single, above $165K: Backdoor Roth. Traditional non-deductible has no advantage.
- Married filing jointly, under $123K: Traditional if you prefer the deduction today. Roth if you want flexibility.
- Married filing jointly, $123K-$236K: Roth directly.
- Married filing jointly, above $246K: Backdoor Roth.
The Practical Non-Answer
Honestly — for most mid-career professionals saving seriously — it matters less than people think. The difference between optimal Roth and optimal Traditional over 30 years is probably 10-15% of the account balance. Real money, but small relative to the decision of whether to save $7,000 at all.
If you can't decide, split it. $3,500 Traditional, $3,500 Roth. You get tax diversification and some reduction in bracket risk either direction. It's not optimal, but it's robust — the portfolio version of "I don't know where rates are going either."
And if you're below the Roth phase-out: Roth. Simpler, no RMDs, tax-free forever, leaves better estate planning options. For most readers under $150K single, the Roth is the right answer 75% of the time.