Roth IRA vs traditional IRA: which is better?
Quick answer
A traditional IRA gives a tax deduction now but taxes withdrawals in retirement; a Roth IRA is funded with after-tax money but grows and withdraws tax-free. Choose Roth if you expect a higher tax rate in retirement (common for young or early-career savers); choose traditional if you are in your peak earning years.
Both account types shelter investment growth from annual taxes and share the same contribution limit ($7,000 in 2025, plus a $1,000 catch-up at 50+). The difference is when you pay tax. Traditional contributions may be deductible today, lowering this year’s tax bill, but every dollar withdrawn in retirement is taxed as ordinary income. Roth contributions get no deduction, but qualified withdrawals — contributions and all growth — are completely tax-free after age 59½ and five years.
If your tax rate were identical at contribution and withdrawal, the two would produce mathematically identical after-tax results. The decision therefore hinges on comparing your marginal tax rate now versus your expected rate in retirement. A 25-year-old in the 12% bracket will likely retire in a higher bracket, making Roth compelling. A 50-year-old in the 35% bracket who expects modest retirement spending probably benefits more from the traditional deduction today.
Beyond the headline math, Roth IRAs have practical advantages: no required minimum distributions during your lifetime, tax-free inheritance for heirs, penalty-free withdrawal of contributions (not earnings) at any time, and no impact on the taxation of Social Security benefits. Traditional IRAs suit people who need the deduction now or who can invest the tax savings.
Eligibility matters too. Roth IRA contributions phase out at higher incomes (starting around $150,000 single / $236,000 married in 2025), though the "backdoor Roth" conversion route remains available. Traditional IRA deductibility phases out if you are covered by a workplace plan. Many savers reasonably split contributions between both to diversify future tax risk.
Similar logic applies elsewhere: Roth vs traditional 401(k) in the US, TFSA vs RRSP in Canada, and ISA vs pension in the UK. Project your own numbers with a Roth IRA calculator to see how much tax-free growth your contributions could generate by retirement.
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