The traditional vs. Roth IRA debate has a simple framing: pay taxes now (Roth) or pay taxes later (Traditional). In practice, the answer depends on a set of personal variables that most retirement calculators ignore.
The Core Trade-off
Traditional IRA contributions are typically tax-deductible today, and you pay ordinary income tax when you withdraw in retirement. Roth contributions use after-tax dollars, but qualified withdrawals — including growth — are entirely tax-free.
The math only favors one over the other if your tax rate in retirement is meaningfully different from your rate today. If you'll be in a higher bracket in retirement, the Roth wins. If you'll be in a lower bracket, the Traditional wins. If the rates are similar, both options produce roughly equivalent outcomes.
Why the Conventional Wisdom Is Incomplete
Most financial advice defaults to 'young people should use Roth because their rates are low now.' That's often true — but not always. A 28-year-old in a high cost-of-living city making $120k may be in a lower effective tax bracket post-retirement than they expect. Required Minimum Distributions at 73 can push retirees into higher brackets than their working years.
The Roth also offers an underappreciated benefit: no Required Minimum Distributions. This makes it a powerful estate planning tool if you don't need the income in retirement.