Money & Investing
Roth vs Traditional IRA: Which Is Right for You?
By the TrueNumbers team · Updated June 2026 · 7 min read
The Roth versus traditional decision gets framed as complicated, but at its core it's a single bet: are you better off paying taxes on this money now, while you know your current tax rate, or later, when your future tax rate is uncertain? Everything else is detail around that one central question.
The tax timing decision, explained simply
A traditional IRA or 401k gives you a tax deduction today — your contribution reduces your taxable income this year — but every dollar you withdraw in retirement is taxed as ordinary income. A Roth IRA or Roth 401k gives you no deduction today — you contribute with money you've already paid tax on — but qualified withdrawals in retirement are completely tax-free, including all the growth that accumulated over the years.
The decision is fundamentally a bet on your tax rate today versus your tax rate in retirement. If you expect to be in a lower tax bracket in retirement than you are now, traditional tends to win, since you're deferring tax from a higher-rate year to a lower-rate year. If you expect to be in a similar or higher bracket in retirement, Roth tends to win, since you're locking in today's rate on money that will otherwise grow and be taxed later at a potentially higher rate.
The break-even tax rate, conceptually
There's a specific tax rate at which traditional and Roth produce mathematically identical after-tax outcomes, assuming your contribution amount and investment growth are otherwise the same. If your retirement tax rate ends up below that break-even point, traditional wins. If it ends up above, Roth wins. The challenge, of course, is that nobody knows their actual future tax bracket with certainty decades in advance — tax law itself can change, your retirement income could be higher or lower than expected, and where you live in retirement affects state tax rates too.
Who tends to favor each option
Younger workers early in their careers, often in a lower tax bracket than they'll likely be in later, are frequently well-suited to Roth contributions — paying tax now at a low rate, then enjoying tax-free growth and withdrawals once their income (and tax bracket) is higher. High earners currently in a peak tax bracket, especially those expecting to spend less and drop into a lower bracket in retirement, often lean toward traditional, capturing today's deduction at a high rate and deferring tax to a year when their rate is likely lower.
There's also a strong case for splitting contributions between both account types if you're uncertain — it hedges against tax law changes and gives you flexibility in retirement to manage your taxable income by choosing which account to draw from in a given year.
Income limits and contribution rules
Both account types have annual contribution limits, and Roth IRAs specifically have income limits above which direct contributions are restricted or phased out. These figures change periodically with inflation adjustments and legislation, so treat any specific number you've seen as potentially outdated and verify current limits directly at irs.gov before making contribution decisions, rather than relying on older figures you may have seen elsewhere.
A worked example of the tax-timing bet
Suppose you contribute $6,000 this year while in a 24% marginal tax bracket. Through a traditional account, that full $6,000 goes in pre-tax, and you save $1,440 in taxes this year. Through a Roth account, you'd need to earn roughly $7,900 pre-tax to net the same $6,000 after paying 24% tax on it now, since the contribution comes from already-taxed income.
Assume that $6,000 grows to $40,000 by retirement. Withdrawn from a traditional account, it's taxed as ordinary income — at a 15% retirement bracket, you'd keep $34,000; at a 24% bracket matching your contribution year, you'd keep $30,400. Withdrawn from a Roth account, the full $40,000 is yours tax-free, regardless of your retirement bracket. The traditional account only comes out ahead if your retirement tax rate ends up meaningfully lower than your contribution-year rate — which is exactly the bet at the center of this decision.
Frequently asked questions
Is there a dedicated calculator for this decision on TrueNumbers?
Not yet as a standalone tool — this is an area we're planning to build out further. In the meantime, our Early Retirement Number calculator is a useful starting point for thinking through your broader retirement savings picture alongside this decision.
What if I genuinely don't know my future tax bracket?
That uncertainty is exactly why many people split contributions between Roth and traditional accounts — it hedges against being wrong in either direction and gives you flexibility to manage taxable income in retirement.
Are Roth IRA income limits the same every year?
No — they're adjusted periodically for inflation and can change with legislation. Always check the current limits at irs.gov rather than relying on a number you saw in an older article.
Does a Roth 401k have the same income limits as a Roth IRA?
No — Roth 401k contributions, where offered by an employer plan, generally don't have the same income restrictions that apply to Roth IRA contributions. Confirm the specific rules for your plan and verify current limits at irs.gov.
Is traditional always better for high earners?
Often, but not universally — it depends on your expected retirement income and tax bracket, not just your current income. A high earner who expects to spend significantly less in retirement may still benefit from traditional, but it's worth running the comparison rather than assuming.
Can I convert a traditional account to a Roth later?
Yes, through what's called a Roth conversion — you pay tax on the converted amount in the year you convert, then it grows tax-free afterward. This can be a useful strategy in a low-income year, but the tax bill on conversion is due immediately, so it requires careful planning.
Does it matter which account I prioritize if I can't max out both?
Generally, prioritize getting any available employer match first, regardless of account type, since that's immediate free money. After that, the Roth-versus-traditional choice for additional contributions comes back to the same tax-timing bet discussed above.
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