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Yes. A cost-of-living adjustment (COLA) increases the Social Security benefits used in the federal tax calculation, so it can increase the portion of benefits that is taxable. The COLA is not itself a tax, however. Taxability depends on your total benefits, other income, tax-exempt interest, filing status and the rules for the tax year you are filing.
For benefits payable in January 2026, the Social Security Administration announced a 2.8% COLA. The thresholds discussed below are the Internal Revenue Service amounts for tax year 2025; use the final IRS publication and forms for any 2026 return.
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What a COLA changes—and what it does not
A COLA raises the dollar amount of your Social Security benefit. Because the IRS uses part of your benefits in its taxability formula, a larger benefit can raise the formula’s result. If that result moves above a filing-status threshold, some benefits that were previously tax-free may become taxable, or a previously taxable share may become larger.
The increase does not create a separate “COLA tax.” The IRS does not apply a special tax rate to the adjustment, and the COLA does not automatically move every beneficiary into taxable status. The same taxability test applies to the full benefit amount you received during the relevant tax year.
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The 2.8% adjustment announced for 2026 is based on the change in the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) from the third quarter of 2024 through the third quarter of 2025. It applies to Social Security benefits payable in January 2026. That timing matters: a 2025 tax return generally reflects benefits paid during 2025, while a 2026 return will reflect the higher 2026 payments.
“By law, federal benefits increase when the cost of living rises, as measured by the Department of Labor’s Consumer Price Index for Urban Wage Earners and Clerical Workers.” — Social Security Administration, explanation of the 2026 COLA
How the IRS decides whether benefits are taxable
For tax year 2025, the IRS starts with a provisional-income calculation. Add these two components:
- One-half of your Social Security benefits, including applicable equivalent Tier 1 railroad retirement benefits.
- All other income, including tax-exempt interest.
Compare that total with the base amount for your filing status. If the total is at or below the base amount, none of your benefits is taxable under this test. If it is above the base amount, use the applicable IRS worksheet to calculate the taxable portion.
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The calculation uses your benefits and income for the tax year, not the percentage of the COLA. A 2.8% increase is therefore not a 2.8% tax increase. The result could be no change in taxability, a modest increase in taxable benefits or—when the higher-income rules apply—a taxable share of as much as 85% of benefits.
Tax-year 2025 base amounts by filing status
Publication 915 for tax year 2025 lists these base amounts:
| Filing status | 2025 base amount | Condition |
|---|---|---|
| Single | $25,000 | Applies to a single filer |
| Head of household | $25,000 | Applies to a head-of-household filer |
| Qualifying surviving spouse | $25,000 | Applies to a qualifying surviving spouse |
| Married filing separately | $25,000 | Only if you lived apart from your spouse for all of 2025 |
| Married filing jointly | $32,000 | Joint return |
| Married filing separately | $0 | If you lived with your spouse at any time in 2025 |
These are tax-year-specific IRS amounts. They are not indexed automatically to the Social Security COLA. A benefit increase can raise your provisional income while the applicable base amount remains the one set for that tax year.
When the taxable share can reach 85%
Generally, up to 50% of benefits may be taxable once your provisional income exceeds the applicable base amount. Publication 915 also describes higher-income rules under which up to 85% of benefits may be taxable. The higher thresholds identified for 2025 are $34,000 for an individual and $44,000 for a married couple filing jointly.
“Up to 85%” does not mean the IRS taxes 85% of every beneficiary’s payment, nor does it mean your marginal income-tax rate is 85%. It means that, under the statutory formula, as much as 85% of the benefits can be included in taxable income. The worksheet determines the exact amount from your benefits, other income, filing status and the relevant thresholds.
How a 2026 COLA can affect a real tax calculation
Example: the increase does not cross the base amount
Assume a single taxpayer received $24,000 of Social Security benefits and $10,000 of other income in a year, with no tax-exempt interest. One-half of the benefits is $12,000, producing provisional income of $22,000. That is below the $25,000 single-filer base amount, so none of the benefits is taxable under the test.
After a 2.8% increase, the annual benefit would be $24,672 if the entire year reflected that higher amount. One-half is $12,336; with the same $10,000 of other income, provisional income is $22,336. It is still below $25,000, so the increase alone would not make benefits taxable in this example.
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Example: the increase raises an already taxable amount
Assume a single taxpayer receives $20,000 of benefits and $18,000 of other income. One-half of benefits is $10,000, so provisional income is $28,000—above the $25,000 base amount. Some benefits may be taxable.
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A 2.8% increase would make the annual benefit $20,560 if applied for the full year. One-half becomes $10,280, and provisional income becomes $28,280. The taxpayer remains above the base amount, but the higher provisional income can increase the amount produced by the worksheet. The exact taxable figure cannot be determined from the threshold comparison alone.
Example: a taxpayer already near the higher-income rule
Suppose an individual has $24,000 of benefits and $23,000 of other income. One-half of benefits plus other income equals $35,000, which is above the $34,000 individual threshold described for the higher-income rules. If the benefit rises by 2.8% for a full year, the same calculation becomes $12,336 plus $23,000, or $35,336. The taxpayer was already in the range where the 85% limit may apply; the COLA increases the amount fed into the worksheet rather than creating a new tax category.
These examples are illustrations, not substitute calculations. Actual taxable benefits can depend on the precise IRS worksheet, additional income items, marital circumstances and the amount of benefits paid during the year.
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Does the COLA change the income limits for taxing Social Security?
No. The COLA changes the benefit amount. The base amounts and higher-income thresholds are separate figures established under the tax rules for a particular year. For 2025, the base amounts are $25,000, $32,000 or $0 depending on filing status and whether a married-filing-separately taxpayer lived with a spouse. The higher-income figures cited by Publication 915 are $34,000 for an individual and $44,000 for a joint return.
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Therefore, a COLA can make it easier to exceed a threshold without changing the threshold itself. If your other income is close to a base amount, even a relatively small benefit increase can change the worksheet result. If you are well below the threshold, the same percentage increase may leave your benefits fully nontaxable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to determine your taxable benefits for the return you are filing
- Identify the tax year. Use the IRS publication, worksheet and Form 1040 instructions for the year covered by your return. The figures above are for tax year 2025.
- Gather your benefit total. Use the Social Security benefit statement for the year, and include applicable equivalent Tier 1 railroad retirement benefits where the IRS instructions require them.
- List other income. Include all other income required by the IRS calculation and add tax-exempt interest; tax-exempt interest is included in this provisional-income test even though it is generally not taxable itself.
- Apply the one-half-benefit formula. Divide the relevant benefits by two and add the other income and tax-exempt interest.
- Compare with your filing-status base amount. If the result is at or below the base amount, the test produces no taxable benefits. If it is above the base amount, continue with the worksheet.
- Complete the IRS worksheet for the applicable year. The worksheet accounts for the 50% and 85% limits and calculates the taxable portion from your complete facts. Do not estimate the taxable amount by simply multiplying the COLA percentage by your tax bill.
How Social Security benefits are reported on a 2025 federal return
For a return covering tax year 2025, Publication 915 instructs taxpayers to report net benefits on Form 1040 or Form 1040-SR, line 6a, and the taxable portion on line 6b. Follow the instructions for the specific tax year being filed because line numbers, worksheets and form directions can change.
Line 6a is the total net benefits reported for the year; line 6b is only the part the IRS determines is taxable. The two numbers are not interchangeable. A taxpayer can report the full benefit on line 6a while reporting a smaller taxable amount on line 6b, including zero when the test produces no taxable benefits.
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Check the payment year, not just the announcement date
A COLA announced in one calendar year may apply to benefits payable in a later year. The 2026 adjustment applies to payments payable in January 2026. Match the benefits actually paid during the tax year to the return for that year.
Recalculate if other income also changes
The benefit increase is only one input. A pension distribution, wages, interest, capital gains or tax-exempt interest can also raise provisional income. Re-run the IRS calculation when several income sources change at once rather than judging the effect from the COLA percentage alone.
Use the final rules for a future return
The IRS search result for a 2026 Publication 915 was identified as a draft. It can signal that future-year instructions are being updated, but final 2026 tax rules should be taken from the final IRS publication and forms when you prepare a 2026 return. Do not carry the 2025 thresholds into a future year without checking the applicable guidance.
Quick Recap
Key takeaways
- A Social Security COLA can increase taxable benefits because it increases the benefit amount included in the IRS formula.
- The COLA itself is not a separate tax and does not automatically make benefits taxable.
- For tax year 2025, the base amounts are $25,000 for single, head-of-household, qualifying-surviving-spouse and certain married-filing-separately taxpayers; $32,000 for joint filers; and $0 for married-filing-separately taxpayers who lived with a spouse during the year.
- Up to 50% of benefits may be taxable under the ordinary rules, and up to 85% may be taxable under the higher-income rules. The exact amount requires the IRS worksheet.
- The 2026 COLA is 2.8% and applies to Social Security benefits payable in January 2026.
- Use the publication and forms for the tax year at issue when calculating and reporting benefits.
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