Social Security is not taxed in Iowa. Starting with the 2023 tax year, Iowa fully excludes Social Security benefits from state income tax, and that exclusion is still in place for 2026. Federal tax is a separate matter, and depending on your total income, the IRS can still tax up to 85 percent of your benefits.
How Iowa’s Exclusion Works
Iowa Code Section 422.7 tells taxpayers to subtract the full amount of Social Security benefits that would otherwise be taxable under federal law from their Iowa net income.1Justia. Iowa Code 422-7 – Net Income How Computed Whatever the IRS counts as taxable Social Security gets zeroed out on your Iowa return. The exclusion covers retirement benefits, survivor benefits, and Social Security disability benefits.
This full exclusion took effect for tax years beginning on or after January 1, 2023, when Governor Reynolds signed House File 2317 into law.2Department of Revenue. Retirement Income Tax Guidance Before then, Iowa taxed Social Security on rules that largely tracked the federal formula, and higher-income retirees saw a state tax bite. That is gone.
What the Federal Government Still Taxes
The IRS uses a figure it calls “combined income,” sometimes labeled provisional income, to decide how much of your benefits are taxable. Combined income equals your adjusted gross income, plus any tax-exempt interest, plus half of your Social Security benefits.3Internal Revenue Service. Social Security Income
The thresholds have never been adjusted for inflation, so they pull in more retirees each year:
- Single filers with combined income between $25,000 and $34,000: up to 50 percent of benefits are taxable.
- Single filers above $34,000: up to 85 percent of benefits are taxable.
- Married filing jointly between $32,000 and $44,000: up to 50 percent of benefits are taxable.
- Married filing jointly above $44,000: up to 85 percent of benefits are taxable.
Those thresholds come from 26 U.S.C. ยง 86.4Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits One trap catches married couples who file separately and lived together at any point during the year: their base amount is zero, so up to 85 percent of their benefits can be taxed starting at the first dollar of combined income. Filing jointly almost always produces a better result.
The “up to 85 percent” language confuses people. It is not an 85 percent tax rate on your Social Security. It means 85 percent of your benefit amount is added to your other income, and your ordinary federal tax rate then applies to that total. No one pays federal income tax on more than 85 percent of their benefits, regardless of how high income goes.
Setting Up Federal Withholding
Social Security checks arrive with no federal tax withheld unless you ask for it. Retirees often find this out at filing time, when they owe a lump sum. IRS Form W-4V lets you elect voluntary withholding at one of four rates: 7 percent, 10 percent, 12 percent, or 22 percent.5IRS. Form W-4V Voluntary Withholding Request Submit the completed form to the Social Security Administration, not to the IRS. You can also make the request online at ssa.gov or by calling SSA at 1-800-772-1213.
Custom dollar amounts and off-menu percentages are not available. If none of the four rates lines up with what you actually owe, quarterly estimated tax payments are the way to close the gap.
Do You Need to File an Iowa Return
If Social Security is your only income, you likely do not need to file an Iowa return, because those benefits are fully excluded from Iowa taxable income. Filing becomes an obligation once you have other taxable income that pushes your Iowa liability above the filing threshold.
For retirees who do owe Iowa tax on income other than Social Security, the state requires estimated quarterly payments if you expect to owe $1,000 or more on income not subject to withholding for tax years beginning in 2026.6Department of Revenue. Estimated Income Tax Payments Payments run through GovConnectIowa, the state’s tax portal.
What the 2026 COLA Changes
Social Security benefits are rising 2.8 percent for 2026, based on the Consumer Price Index calculation from the third quarter of 2024 through the third quarter of 2025.7Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet The higher payment does not change your Iowa position, since the full benefit remains excluded. It can, however, push your combined income past a federal threshold and raise the taxable share at the federal level. If your benefit went up but your withholding stayed the same, run the numbers before April.
SSI Is a Different Program
Supplemental Security Income, or SSI, is a separate needs-based program that the Social Security Administration also manages. SSI is funded through general Treasury revenue rather than payroll taxes and is not taxable at the federal level.3Internal Revenue Service. Social Security Income It goes to people with limited income and resources who are 65 or older, blind, or disabled.8Social Security Administration. Understanding Supplemental Security Income (SSI) Overview If you receive SSI rather than Social Security retirement or disability benefits, taxation is not a concern at either level.