Reviewed by Thomas J. Catalano
Fact checked by Suzanne Kvilhaug
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The income you receive from your 401(k) or other qualified retirement plan doesnât affect the amount of the Social Security retirement benefit you receive each month, but does affect whether your benefits are taxable. Certain thresholds determine if your income, including your 401(k) distributions, is taxable.
Key Takeaways
- Withdrawals from a 401(k) can begin when an account holder turns 59½ years old.
- Social Security retirement benefits are not affected by 401(k) plans.
- Distributions from a 401(k) may increase your total annual income, affecting the tax on Social Security benefits.
Social Security vs. 401(k) Income
Social Security benefits are determined by the amount of money earned during an individualâs working years and paid Social Security taxes. Social Security taxes the full amount of your compensation in the year you earned it up to a predetermined annual limit established by the Internal Revenue Service (IRS). For 2024, itâs $168,600.
401(k) contributions and withdrawals do not affect Social Security benefits. Contributions to a 401(k) are made with pretax dollars but are subject to Social Security and Medicare taxes. Contributions to a Roth 401(k) are subject to income taxes. Youâll pay your income tax on non-Roth 401(k) distributions in retirement.
Important
Income from Social Security may increase annually if the Social Security Administration approves a cost of living adjustment (COLA), commonly based on inflation. For 2025, recipients can expect a 2.5% increase.
The Tax Impact of 401(k) Savings
Individuals may have to pay income tax on some of their Social Security benefits if their annual combined incomeâincluding those 401(k) distributionsâexceeds a certain amount. Taxes are not levied on individuals whose total income is less than $25,000 or $32,000 if filing jointly with a spouse.
You may be required to pay taxes on up to 50% of your benefits if your income is between $25,000 and $34,000 or between $32,000 and $44,000 if filing jointly. Up to 85% of your benefits may be taxable if youâre single and earn more than $34,000 or married earning more than $44,000. According to the Social Security Administration (SSA), combined income equals the sum of:
- Adjusted gross income (AGI), which includes earned wages and withdrawals from any retirement savings accounts, like individual retirement accounts (IRAs) and 401(k)s
- Any nontaxable interest
- One-half of your Social Security benefits
Determining Social Security Benefits
The SSA calculates an average monthly benefit amount based on your average income and the years youâre expected to live. You can begin receiving Social Security benefits as early as age 62, but the benefit amount is reduced for each month you collect before you reach your full retirement age.
The full retirement age is 66 if you were born between 1943 and 1954. It increases from age 66 by two months each year until age 67 if you were born between 1955 and 1960. The full retirement age is 67 if you were born in 1960 or later.
In 2024, the maximum monthly benefit at full retirement age is $3,822. Those who wait until age 70 can collect a benefit of up to $4,873.
Visit the SSA website for an estimate of benefits using the online calculator.
Other Retirement Income
Other types of retirement income can affect your benefit amount even if you collect benefits on your spouseâs account. Your benefits may be reduced due to income you receive from a government pension or another job for which your earnings werenât subject to Social Security taxes. This rule primarily affects people working in state or local government positions, the federal civil service, or those employed with a foreign company.
Social Security benefits will be reduced by two-thirds of a pension from a government position not subject to Social Security taxes. This rule is referred to as the Government Pension Offset. For example, for those eligible to receive $1,200 in Social Security but who receive $900 from a government pension, benefits will be reduced by $600 (2/3 Ă $900). Your total monthly income of $2,100 ($1,200 + $900) would drop to $1,500 ($600 + $900).
This Windfall Elimination Provision (WEP) reduces the unfair advantage given to those who receive benefits on their account and receive income from a pension based on earnings for which they did not pay Social Security taxes. The WEP reduces Social Security benefits by a certain factor in these cases, depending on the age and birth date of the applicant. But it doesnât apply if you also have 30 or more years of earnings on which you did pay Social Security taxes.
Social Security Fairness Act
The Social Security Fairness Act, concerning the Windfall Elimination Provision and Government Pension Offset, was signed into law on Jan. 5, 2025. It eliminates the reduction of Social Security benefits while entitled to public pensions from work not covered by Social Security. The Social Security Administration is evaluating how to implement the act.
Are 401(k) Withdrawals Considered Income for Social Security Purposes?
Social Security only considers earned income, such as a salary or wages from a job or self-employment. Withdrawals will be included in income and determine whether your Social Security benefits are taxable and, if so, how much.
Will Working in Retirement Reduce Social Security Benefits?
The Social Security Administration (SSA) will withhold $1 in benefits for every $3 you earn above the annual limit in the year you reach full retirement age. This limit is $59,520 in 2024. The SSA will instead deduct $1 from your benefit payments for every $2 you earn above the annual limit of $22,320 in 2024 if youâre under full retirement age. There is no withholding after you reach full retirement age.
Should I Use My 401(k) Before I Take Social Security?
You must start withdrawals from your 401(k) after age 72 (or age 73 if you turned 72 after Dec. 31, 2022), but you can start withdrawing from your 401(k) plan as early as age 59½. Thatâs sooner than youâre eligible to begin receiving Social Security benefits. You may want to defer withdrawing from either to maximize retirement income if you still work.
The Bottom Line
Income from a 401(k) doesnât affect the amount of your Social Security benefits, but it can boost your annual income to a point where those benefits will be taxed. This can be tricky for someone required to withdraw from their 401(k) and collect Social Security. Individuals and couples must factor in tax liabilities when planning for retirement or deciding how large of a 401(k) distribution they should take.