Social Security Checks Are Rising 3.6% in 2027. The Tax Threshold That Could Swallow Part of the Raise Hasn’t Moved in Decades
A bigger Social Security check sounds like good news until you learn about a tax threshold that has not budged in decades. Where Linda's money actually lands depends on income sources she controls right now, before January arrives.
This post may contain links from our sponsors and affiliates, and Flywheel Publishing may receive compensation for actions taken through them.
Picture a single retiree we will call Linda. The monthly check from the government is $2,000, she takes a bit from an IRA, and she earns some interest on savings. On October 14, Social Security announced a 3.6% increase for 2027. Linda’s bigger check starts arriving in January.
She has no reason to suspect a catch. The federal thresholds that determine the taxable portion of her payment will stay exactly where they are. Her check grows, and the tax test it has to pass stays put.
How Provisional Income Pulls Benefits Into the Tax Net
The IRS uses something called provisional income to figure out how much of your Social Security is taxable. It combines your other income, including IRA withdrawals, any tax-free interest and half of your benefits.
The provision that governs how benefits are taxed, Section 86 of the tax code, sets two lines for single filers: $25,000 and $34,000. Married couples filing jointly face lines at $32,000 and $44,000.
Below the first line, none of your benefits are taxable. Between the two, IRS guidance on federal income tax says generally up to 50% of benefits can be taxable. Above the second line, up to 85% can be.
That 85% figure trips people up. It caps the share of your benefit that counts as taxable income. Your actual tax is then figured on that counted piece at your normal rate, after deductions.
Running Linda’s Numbers on a Napkin
The 3.6% raise increases Linda’s $2,000 benefit by $72, to $2,072 a month.
Across the year, that is $864 more in benefits.
If her IRA withdrawals and interest stay the same, half of that raise, or $432, lands on her provisional income. Whether that matters depends entirely on where she started.
- Well below the first line: The extra $432 changes nothing. Her benefits remain untaxed, and the full raise is hers to spend.
- Just under or between the lines: This is where the pressure happens. Between the two thresholds, the statute counts one-half of every dollar above the base amount, so the raise draws a piece of her benefit into taxable income that was not there before.
- Above the higher line: More of her benefits can become taxable as her income rises, until 85% of her Social Security is included. Once she reaches that ceiling, 85 cents of every additional dollar in benefits counts as taxable income.
The squeeze can be especially noticeable once retirees cross the higher threshold, and even modest pensions or regular IRA withdrawals can put them there.
Why This Squeeze Comes Back Every January
Social Security’s cost-of-living adjustment (COLA) was 2.8% in 2026, compared with a much larger 8.7% in 2023. Other benefit figures move with wages, too: the maximum earnings subject to payroll tax rises from $184,500 in 2026 to $192,300 in 2027.
Congress never indexed the benefit tax thresholds to inflation, so they have stayed frozen for decades. Each raise nudges more retirees across lines that never move. Over time, a tax originally aimed at higher earners reaches people with fairly ordinary incomes (it is one of nine subtle IRS rules we mapped in a free retiree tax trap guide).
More taxable benefits means more income shows up on your return. The raise itself still lands in your account. Your standard deduction and the rest of your tax picture decide what you actually owe, and plenty of retirees with some taxable benefits still owe little or nothing.
Check These Income Sources Before December Closes Out
The COLA itself is fixed. The rest of your provisional income is where you have room to act. Before year end, take stock of three things: taxable pension payments, traditional IRA withdrawals, and interest income. A large IRA withdrawal taken in a year when you sit near a threshold can push more of your benefit into taxable territory than the same withdrawal spread across two years.
Municipal bond interest gets added back into provisional income, so moving savings into tax-free bonds does less here than many people expect. Qualified Roth withdrawals generally stay out of the calculation, which makes them a useful tool for retirees who have them.
Treat the 3.6% as income to plan around before you spend it. Pull last year’s return, see which zone you landed in, and map where your 2027 withdrawals will put you. Two retirees with identical checks can come out very differently depending on how their other income is timed, so your own numbers deserve a close look.
Contact [email protected] for any questions or corrections.
Gerelyn Terzo is the author of dividend investing handbook "Dividend Investing Strategies: How to Have Your Cake & Eat It Too." A veteran financial journalist, she covers agri-finance for outlets like Global AgInvesting and the broader stock market and personal finance for 24/7 Wall Street. She began at CNBC and later helped launch Fox Business in New York. Gerelyn currently resides in Woodland Park, Colorado and dabbles in nature photography as a hobby.
