A Social Security cost-of-living adjustment (COLA) can increase the amount of benefits included in the federal tax calculation, but it does not automatically make your benefits taxable. The Social Security Administration (SSA) sets the COLA from inflation data, while the Internal Revenue Service (IRS) applies a separate formula using your total benefits, filing status and other income. The official 2027 COLA has not been announced as of October 13, 2026; SSA says it will announce it in October 2026.
What the 2027 COLA does—and does not—decide
SSA calculates the annual adjustment under a statutory formula based on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). Its COLA summary explains the process. The 2026 COLA was 2.8%, measured from CPI-W in the third quarter of 2024 through the third quarter of 2025, according to SSA’s 2026 fact sheet. That historical percentage is not a forecast of the 2027 adjustment.
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A higher monthly benefit raises the benefits figure that appears on your tax return, but the COLA percentage alone cannot show whether you cross an IRS threshold or how much tax you owe. Two people receiving the same COLA can have different results because their filing statuses and non-Social-Security income differ.
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For tax year 2025, IRS Publication 915 uses a “base amount” comparison. You combine part of your Social Security benefits with other income, including tax-exempt interest, and compare the result with the base amount for your filing status.
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| Filing status (2025 return) | Base amount in Publication 915 |
|---|---|
| Single, head of household, qualifying surviving spouse, or certain married-filing-separately taxpayers who lived apart from a spouse all year | $25,000 |
| Married filing jointly | $32,000 |
| Married filing separately and lived with a spouse at any time during the year | $0 |
These are 2025 tax-year figures. Do not treat them as confirmed thresholds for a 2027 return; use the IRS publication and worksheet for the relevant tax year when it is available.
What counts as “other income”
The worksheet generally starts with adjusted gross income (before excluding Social Security benefits), adds tax-exempt interest, and adds one-half of your Social Security benefits. Wages, pensions, interest, dividends, rental income and capital gains can therefore affect the result. For a joint return, the IRS expressly says: “Even if your spouse didn’t receive any benefits, you must add your spouse’s income to yours to figure whether any of your benefits are taxable.”
Up to 85% is an inclusion limit, not a tax rate
Depending on the worksheet result, none, part or up to 85% of benefits may be included in taxable income. “85% taxable” does not mean an 85% tax rate. The included amount is then taxed at your ordinary federal income-tax rates, subject to the rest of your return, deductions and credits. The worksheet—not the COLA percentage—produces the benefits inclusion amount.
Why readers call this a “42-year-old” tax trap
The Congressional Budget Office (CBO) reports that Social Security benefits first became taxable in 1984. That is the historical reference behind “42 years ago” in 2026. It does not establish that today’s $25,000 and $32,000 base amounts were fixed in 1984, nor that every taxpayer who receives a COLA will owe tax.
CBO’s 2026 analysis projects that income taxes paid on Social Security benefits will equal 7.1% of those benefits in 2026 and 9.0% in 2056. Those are economy-wide projections, not an individual retiree’s tax rate or a forecast of what your COLA will cost you.
How to check your own exposure after the COLA is announced
- Identify the correct tax year. A 2027 COLA affects benefits paid in 2027, generally reported on a 2027 federal return filed in 2028. Wait for the IRS publication for that year’s thresholds and worksheet.
- Total your annual Social Security benefits. Use your SSA benefit statement or Form SSA-1099 for the year. Include benefits received by both spouses on a joint return.
- List other income. Include wages, pensions, interest, dividends, gains, rental income and tax-exempt interest. The IRS worksheet specifies which items belong in the calculation.
- Apply your filing status. Compare the worksheet result with the base amount for your status. Married filing separately can produce a $0 base amount when spouses lived together during the year.
- Complete Publication 915’s worksheet. It determines the portion, if any, that goes into taxable income. Do not multiply the COLA percentage by a guessed tax rate.
- Plan withholding or estimated payments separately. If the worksheet shows more taxable income, review federal withholding from benefits, pensions and other payments or make estimated payments. The COLA itself does not change the statutory formula.
Illustrative comparison: why the same COLA can produce different results
Consider two hypothetical recipients who each receive the same percentage increase in benefits. The first files single, has no other income and remains below the applicable base amount. The second files jointly, combines both spouses’ benefits and has pension income, dividends and tax-exempt interest. The second household can have taxable benefits even though the COLA percentage is identical. Without the actual benefit totals, other income, filing status and tax year, no responsible calculation can state either person’s tax.
| Input the worksheet needs | Why it matters |
|---|---|
| Filing status | Determines the applicable base amount and special married-filing-separately rule. |
| Total Social Security benefits | A COLA raises this input, but not by itself the taxable percentage. |
| Other income | Can push combined income over one or more worksheet thresholds. |
| Tax-exempt interest | Counts in the IRS combined-income calculation even though the interest itself is generally exempt from federal income tax. |
| Tax year | Controls which IRS thresholds and worksheet instructions apply. |
What is known about 2027 right now
SSA’s latest COLA page says the next adjustment will be announced in October 2026. As of October 13, 2026, no official 2027 percentage is established in the cited material. Any number published before SSA’s announcement is an estimate and should be labeled as such. SSA solvency materials may model proposed benefit-tax changes, but those options are not current law; the agency’s taxation provisions page should not be read as an enacted change.
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A COLA can increase the income used in the IRS Social Security benefits worksheet, so some households may see a larger taxable-benefits amount. It does not impose a fixed tax on every dollar of the increase, and it does not by itself determine whether benefits are taxable. Check the IRS worksheet for the relevant tax year using your filing status, both spouses’ income where applicable, total benefits, other income and tax-exempt interest.
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