A Roth 401(k) calculator projects how much you could have at retirement by contributing after-tax dollars to a Roth 401(k), and compares it with a traditional pre-tax 401(k). Enter your salary, contribution, employer match, expected return and current and future tax rates, and it estimates your balance and after-tax value.
The key difference is when you pay taxes. With a traditional 401(k), contributions lower your taxable income now, but withdrawals in retirement are taxed. With a Roth 401(k), you pay taxes now, but qualified withdrawals, including earnings, are tax-free in retirement. If you expect your tax rate to be higher in retirement, Roth contributions can be more valuable; if you expect it to be lower, traditional may come out ahead.
Example: contributing $6,000 a year for 30 years at a hypothetical 7 percent average return grows to roughly $567,000. In a Roth, that full amount could be withdrawn tax-free if rules are met. In a traditional account, withdrawals would be taxed at your retirement rate.
Tips: contribute at least enough to get your full employer match, check the annual IRS contribution limits (which include catch-up contributions for older workers), and consider splitting contributions between Roth and traditional for tax diversification. Rules on employer matches to Roth accounts and required distributions have changed recently, so check current regulations. This is educational, not financial advice.
Why use an online Roth 401(k) Calculator: it saves time, avoids simple arithmetic mistakes and shows each step, so you can check your homework, plan a project or make a decision with confidence. Bookmark the page so it’s ready the next time you need it.
Tips for getting accurate results from the Roth 401(k) Calculator: double-check that every input uses the right units, enter numbers without commas or symbols, and run the calculation a second time with a quick estimate in your head to confirm the answer looks reasonable.
Learn more on Wikipedia’s Roth 401(k) article. Find TSP and compound interest calculators on Minedit.