Roth and traditional retirement accounts (401(k) or IRA) grow the same way. The difference is when you pay tax: Roth now, traditional later. So the choice is mostly a guess about your tax rate today versus in retirement.
1. One example, five tax situations
$10,000 of pre-tax earnings, invested for 20 years at an assumed 7% a year.
| Tax rate now | Tax rate later | Roth after tax | Traditional after tax |
|---|---|---|---|
| 12% | 22% | about $34,050 | about $30,180 |
| 22% | 22% | about $30,180 | about $30,180 |
| 22% | 12% | about $30,180 | about $34,050 |
| 24% | 15% | about $29,410 | about $32,890 |
| 32% | 22% | about $26,310 | about $30,180 |
When the rates are equal, the result is identical. Whichever side has the lower rate wins.
2. When Roth often makes sense
- Early career or a low-income year (low rate now).
- You expect higher income later, or higher tax rates in general.
- You value tax-free withdrawals and flexibility in retirement.
3. When traditional often makes sense
- Peak earning years in a high bracket.
- You expect a lower income in retirement.
- The deduction today helps you qualify for other credits or benefits.
4. You don't have to pick one
Many people split contributions between both, which spreads the risk of guessing wrong about future tax rates. An employer match usually goes into the traditional side either way.
5. Check the rules for your plan
Income limits apply to direct Roth IRA contributions, and contribution limits change most years. Check the current figures before you set your percentage.
Free tools
- Roth vs traditional calculator: https://smartbudgetsheets.surge.sh/calculators/roth-vs-traditional-calculator/?utm_source=mataroa
- 401(k) match calculator: https://smartbudgetsheets.surge.sh/calculators/401k-match-calculator/?utm_source=mataroa
- Retirement savings calculator: https://smartbudgetsheets.surge.sh/calculators/retirement-savings-calculator/?utm_source=mataroa
- Debt Payoff Planner, up to 8 debts (Payhip): https://payhip.com/b/PtBLU?utm_source=mataroa
- 42 free budget templates, pay what you want ($0 is fine): https://smartbudgetsheet.gumroad.com/l/ngpkrb?utm_source=mataroa
General information, not financial advice. Figures are rounded examples.