How to figure out what to withhold from your SSDI payments

The amount you withhold depends on three things: whether your SSDI is taxable in the first place, how much other income you have, and what your total tax bill will be for the year. The Social Security Administration (SSA) does not automatically withhold taxes—you have to request it. If you do not request withholding, you may owe a lump sum at tax time or face penalties for underpayment.

Start by determining whether your benefits are taxable using the combined income formula. Add half your SSDI to all your other income (wages, interest, pensions). If that total exceeds $25,000 (single) or $32,000 (married filing jointly), some of your benefits are taxable. If it does not exceed those thresholds, your SSDI is not taxed and you do not need to withhold anything.

Once you know your benefits are taxable, you need to estimate your total federal income tax for the year. This is where most people need help from a tax professional or tax software, because the calculation involves your tax bracket, deductions, and credits. The withholding amount you request should cover the tax you expect to owe on your SSDI plus any other income.

Key Takeaways

  • You must request SSDI tax withholding yourself—the SSA does not do it automatically, even if your benefits are taxable.
  • Use the combined income formula (half your SSDI plus all other income) to determine whether your benefits are taxable at all.
  • If your combined income exceeds $25,000 (single) or $32,000 (married filing jointly), you will owe tax on up to 85 percent of your benefits.
  • The safest approach is to have a tax professional or tax software calculate your expected tax bill, then request that amount as monthly withholding.
  • You can change your withholding amount at any time by contacting the SSA, so you can adjust if your income changes during the year.

The combined income test: Do your benefits get taxed at all?

Before you calculate withholding, you must know whether your SSDI is taxable. The SSA uses combined income, which is not the same as adjusted gross income (AGI) on your tax return. Combined income = half your annual SSDI + all wages + all interest + all dividends + all pensions + all other taxable income.

Compare your combined income to the thresholds. For single filers, if combined income is $25,000 or less, your SSDI is not taxed. If it is between $25,001 and $34,000, up to 50 percent of your benefits may be taxable. If it exceeds $34,000, up to 85 percent may be taxable. For married couples filing jointly, the thresholds are $32,000 and $44,000.

Example: You receive $1,500 per month in SSDI ($18,000 per year). You also have $12,000 in pension income. Your combined income is ($18,000 ÷ 2) + $12,000 = $21,000. Since $21,000 is below $25,000, your SSDI is not taxed, and you do not need to withhold anything.

Another example: You receive $1,500 per month in SSDI ($18,000 per year) and have $20,000 in wages. Your combined income is ($18,000 ÷ 2) + $20,000 = $29,000. Since $29,000 falls between $25,001 and $34,000, up to 50 percent of your benefits ($9,000) may be taxable, depending on your exact tax situation.

Calculating the actual tax amount you owe

Once you know your benefits are taxable, you need to calculate how much federal income tax you will owe on your total income for the year. This is where the math gets complex, because the tax code applies different rates to different income brackets and allows deductions and credits that reduce your tax bill.

The most reliable way is to use tax software (TurboTax, H&R Block, FreeTaxUSA) or work with a tax professional. Tell them your SSDI amount, your other income sources, and ask them to calculate your total federal income tax liability. That number is what you should request as withholding from your SSDI.

If you want to estimate it yourself, use the IRS tax tables or the tax calculator on irs.gov. You will need to know your filing status, your standard deduction (or itemized deductions), and your tax bracket. The result is your estimated tax bill. Subtract any tax already being withheld from wages or pensions. The remainder is what you should request from your SSDI.

How to request withholding from the SSA

Contact the SSA to request tax withholding. You have three options: call 1-800-772-1213 (TTY 1-800-325-0778), visit your local Social Security office in person, or create an account on ssa.gov and manage withholding online.

When you contact them, tell the representative the dollar amount you want withheld each month. The SSA will deduct that amount from your monthly SSDI payment. You can request withholding of a flat dollar amount (for example, $50 per month) or a percentage of your benefit (for example, 10 percent).

The SSA will send you a written confirmation of your withholding request. Keep this for your records. Your first withheld payment will appear on your next benefit payment, usually within one to two months of your request.

Choosing between flat dollar amounts and percentages

The SSA lets you withhold either a fixed dollar amount each month or a percentage of your monthly benefit. Most people choose a flat dollar amount because it is easier to predict and plan around.

If you request a percentage, the SSA withholds that percentage from every monthly payment. This works well if your benefit amount changes (for example, if you receive a cost-of-living adjustment). If you request a flat dollar amount, you keep that same amount withheld each month even if your benefit increases.

Example: You want to withhold $100 per month. You request a flat $100. If your benefit goes from $1,500 to $1,550 due to a cost-of-living adjustment, you still withhold $100. If you had requested 10 percent instead, you would withhold $155 after the increase.

Adjusting your withholding if your income changes

You can change your withholding amount at any time. If you start a part-time job, receive a pension increase, or have other income changes, contact the SSA and request a new withholding amount. There is no penalty for changing it, and you can do it as many times as you need during the year.

If you under-withhold and owe money at tax time, you can increase your withholding for the following year to avoid the same problem. If you over-withhold and get a refund, you can decrease your withholding. The goal is to match your actual tax bill as closely as possible.

Keep in mind that withholding is not the same as paying estimated taxes. If you have income other than SSDI and wages (such as self-employment income or rental income), you may also need to make quarterly estimated tax payments to the IRS. Withholding from SSDI alone may not be enough.

What happens if you do not withhold enough

If your withholding does not cover your full tax bill, you will owe the difference when you file your tax return. The IRS may also charge you a penalty for underpayment if you owe more than $1,000 at tax time. The penalty is calculated based on how much you underpaid and how late the payment was.

To avoid this, it is better to over-withhold slightly than to under-withhold. If you over-withhold, you will get a refund when you file. While a refund means you gave the government an interest-free loan, it is safer than owing money and facing penalties.

If you are unsure about your withholding amount, ask a tax professional to review your situation. The cost of one consultation is usually much less than the penalty for underpayment.

Frequently Asked Questions

What if I have no other income besides SSDI?

If SSDI is your only income and it is below the combined income threshold ($25,000 for single filers), your benefits are not taxed and you do not need to withhold anything. You also do not need to file a tax return unless you have other filing requirements.

Can I request withholding online through my Social Security account?

Yes. If you have a my Social Security account on ssa.gov, you can view your benefit amount and request or change withholding online. If you do not have an account, you can create one for free. The online option is usually faster than calling or visiting an office.

What if my SSDI is not taxed but I still owe federal income tax?

If your SSDI is below the taxable threshold but you have other income (wages, interest, pensions) that puts you over the threshold for filing, you still owe tax on that other income. You would need to withhold from that income source instead, or make estimated tax payments to the IRS.

Do I need to withhold state income tax from my SSDI?

Some states tax SSDI and some do not. Check your state's tax rules or ask a tax professional. If your state taxes SSDI, you can request state withholding separately from federal withholding using the same process with the SSA.

What if I made a mistake with my withholding amount?

Contact the SSA and request a new withholding amount. There is no penalty for changing it. You can adjust it as often as you need, and the change usually takes effect within one to two months.