Contributions to a traditional 401(k), but not a Roth 401(k), reduce your taxable income
Reviewed by Eric Estevez
Fact checked by Suzanne Kvilhaug
Contributions to traditional and Roth 401(k)s are not tax-deductible. Your employer will have already lowered your taxable income by the amount of your contributions to a traditional 401(k), and Roth 401(k) contributions are made after you pay taxes.
Key Takeaways
- Contributions to traditional 401(k)s or other qualified retirement plans are made with pre-tax dollars and aren’t included in your taxable income.
- If you have a Roth 401(k), contributions are made with post-tax dollars and cannot be deducted.
- Your employer will report your taxable income as part of your W-2; there is no need to track or manually deduct your 401(k) contribution from your annual wages.
- In 2025, the 401(k) maximum individual contribution amount allowable is $23,500 (up from $23,000 in 2024). There is also an allowable $7,500 catch-up contribution for individuals 50 years or older.
How 401(k) Contributions Lower Taxes
Because contributions to traditional 401(k) plans shrink your taxable income, your taxes for the year should be reduced by the contributed amount multiplied by your marginal tax rate, as per your tax bracket.Â
The higher your income, and thus your tax bracket, the more significant the tax savings from contributing to a plan. For example, take a single earner who makes $208,000 a year and also contributes $5,000 annually to a plan. They were in the 32% tax bracket for 2024. Therefore, their tax saving from the contribution is $5,000 multiplied by 32%, or $1,600.
Note, however, that if you choose the Roth 401(k) option, your contributions won’t reduce your taxable income. Instead, your contributions are made with post-tax income. However, during retirement, as long as you’ve had the account for five years, distributions aren’t taxed.
There are limits to how much you can contribute to such a plan. For 2025, the annual limit is $23,500 (up from $23,000 in 2024). Those age 50 or older can make an additional catch-up contribution of $7,500.
Important
You may find you’ll pay fewer taxes on your retirement funds when it comes time to make withdrawals because working years are often the highest earning years.
Distributions From a 401(k)
Of course, you don’t escape paying taxes forever on your traditional 401(k) contributionsâonly until you withdraw them from the plan. When you do so, you must pay income tax on the withdrawals at your applicable tax rate at that time. If you withdraw funds when you’re younger than 59½ and don’t qualify for a hardship withdrawal, you’ll likely pay an early withdrawal penalty of 10% of the amount as well.
However, chances are you’ll pay less to withdraw funds from the plan in retirement than you did when you made the contributions. That’s because your income (and tax rate) are likely to have dropped by then, compared to your working years.
Tax Considerations
Any investment income the contributions may have earned in the years between the contribution and its distribution can also be withdrawn. Earnings and contributions are taxed at the same income tax rate.
You might consider maximizing your contributions to a retirement account as a better investment strategy than directing money to a regular brokerage account. Why? Skipping paying tax on your account contributions allows you to have more capital working on your behalf during the years leading up to retirement.
For example, a person in the 22% tax bracket with 20 years until they retire might either contribute a pre-tax $400 a month to a 401(k) plan or divert the same amount of earnings to a brokerage account. The latter option would yield a monthly contribution of $312 after paying a 22% tax.
The extra $88 per month from the 401(k) option not only increases contributions but further expands the nest egg by having a larger balance on which earnings can compound over decades. The difference between the scenarios could be significant over the long run.
Other Ways to Reduce Taxable Income
Although contributing to tax-advantaged retirement accounts is one of the best ways to reduce your taxable income, you also have other options.
Health Savings Account (HSA)
Health savings accounts (HSAs) are tax-advantaged accounts that are allowed for individuals with high-deductible health plans (HDHPs). HSAs are meant to be used for medical expenses, such as dental and prescription drugs. Contributions are made to the account tax-free. Earnings and distributions that are used for qualified medical expenses are also tax-free.
Flexible Spending Account (FSA)
Flexible spending accounts (FSAs) are another tax-advantaged account. Employers establish these accounts for employees. Contributions are made tax-free. Account withdrawals, when used for medical and dental services, are also tax-free.
Other Retirement Accounts
Other retirement vehicles may also be deductible. For example, contributions to traditional individual retirement accounts (IRAs) can also be deducted from your individual federal income tax amount. Similar to a 401(k), Roth IRAs are not deductible but instead have longer-term tax benefits.
Can I Claim 401(k) Contributions on My Taxes?
You can’t claim your contributions because they are deducted from your income by your employer, so you are not taxed on them.
How Much Does Contributing to a 401(k) Reduce Taxes?
It depends on how much you contribute and your tax bracket. The money you contribute is not counted towards your income, so it automatically reduces your tax burden by the amount you contribute.
Do I Get a Tax Credit for 401(k) Contributions?
You might get a tax credit (called a saver’s credit) on your contributions if you meet certain requirements, such as being 18 or older, not being claimed on another’s return as a dependent, and not being a student.
The Bottom Line
Traditional 401(k) contributions are automatically deducted from your taxable income. You’ll have to pay taxes on the rest of your earnings, but you’ll receive immediate, upfront tax benefits. On the other hand, Roth 401(k) contributions are not deductible but instead provide long-term tax benefits.