Roth contributions are after-tax. The money you put into a Roth IRA or a Roth 401(k) has already been taxed as part of your income for the year, so you get no deduction when you contribute. In exchange, qualified withdrawals in retirement, including all the investment growth, come out completely free of federal income tax.1Internal Revenue Service. Roth Comparison Chart
What After-Tax Means on Your Return
When you make a Roth contribution, nothing on your tax return goes down. If you earn $70,000 and put $7,500 into a Roth IRA, you still owe federal income tax on the full $70,000. That is the opposite of how a traditional IRA or a traditional 401(k) works: with a deductible traditional contribution of the same $7,500, your taxable income for the year would drop to $62,500.1Internal Revenue Service. Roth Comparison Chart
So the tax bill on Roth money is paid up front, at your current rate, in the year you earn the income. Traditional accounts flip that timing: no tax now, but every dollar you withdraw later is ordinary income.
Why Pay the Tax Now
The trade-off is what makes Roth accounts useful. Because the IRS has already taken its share, everything the account earns over the years belongs entirely to you when you take it out. Someone who expects to be in a higher tax bracket in retirement than they are today generally comes out ahead by locking in today’s lower rate. Someone who expects the opposite may prefer the up-front deduction of a traditional account.
Tax-Free Withdrawals in Retirement
Qualified distributions from a Roth IRA are not included in your gross income at all. No tax on the contributions you put in, and no tax on decades of growth.2Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs A distribution counts as qualified only when both of these are true:
- You are at least 59½ when you take the money out. Limited exceptions apply for disability, death, and a first-time home purchase up to $10,000.
- At least five tax years have passed since January 1 of the first year you made any Roth IRA contribution. The clock starts once and covers all of your Roth IRAs; opening a new account does not reset it.
Meet both, and you can empty the account, contributions and earnings alike, without owing federal income tax on any of it.3eCFR. 26 CFR 1.408A-6 – Distributions
Getting Your Own Contributions Back Early
Because you already paid tax on the money you contributed, the IRS lets you pull those regular contributions out of a Roth IRA at any age, for any reason, with no tax and no penalty. Withdrawals from a Roth IRA are treated as coming out in a fixed order, no matter which investments you actually sell:2Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs
- Regular contributions come out first, always tax-free and penalty-free.
- Conversion amounts come out next, on a first-in, first-out basis. Amounts that were taxed at the time of the conversion come out tax-free; amounts that were not taxed may face a 10% penalty if pulled within five years of that conversion and before age 59½.
- Earnings come out last. These are only tax-free and penalty-free if the withdrawal is a qualified distribution.
That ordering is why many Roth IRA holders can tap the account well before retirement without triggering tax. As long as your total withdrawals for the year stay within what you have contributed over your lifetime, nothing is taxable.
When Earnings Do Get Taxed
Take out earnings before you have met both the age and five-year rules and those earnings are added to your taxable income for the year. In most cases they also get hit with an additional 10% early withdrawal penalty.4Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Certain situations waive the 10% penalty, though income tax on the earnings can still apply:
- A permanent disability as defined by federal tax law.
- A first-time home purchase, capped at $10,000 in earnings over your lifetime.
- Distributions to beneficiaries or your estate after your death.
- A series of substantially equal periodic payments calculated under an IRS-approved method.
Roth 401(k): Same After-Tax Principle
A Roth 401(k) runs on the same after-tax logic as a Roth IRA. The money you defer into the Roth side of a workplace 401(k) is taxed in the year you earn it, then grows tax-free, and qualified withdrawals in retirement come out tax-free.1Internal Revenue Service. Roth Comparison Chart
One catch with an employer plan: any matching contributions your employer makes are pre-tax and go into a traditional account, even when your own deferrals are Roth. Only the money you elect to defer can carry the Roth designation. That means a single 401(k) can hold both after-tax (your Roth deferrals) and pre-tax (the match) dollars side by side, and each side follows its own tax rules on the way out.
Roth vs. Traditional: Which Timing Wins
Nobody knows their future tax bracket for certain, but the general logic is straightforward. Paying tax on the seed (Roth) beats paying tax on the harvest (traditional) when your rate later is higher than your rate today. Paying tax on the harvest wins when your rate later is lower. A younger worker early in a career, or anyone in an unusually low-income year, often has a strong case for Roth. A high earner near the peak of their career, expecting a quieter retirement, often has a stronger case for pre-tax contributions.
You are also not forced to pick one. Many workers split contributions between Roth and traditional accounts, which spreads the tax exposure across both today and retirement and keeps future flexibility open.
The Short Version
Roth is after tax on the way in, tax-free on the way out (once the account is qualified). Traditional is the mirror image: pre-tax on the way in, taxed on the way out. That single difference, and where you expect your tax rate to sit years from now, is the whole choice.