How does the Social Security cost-of-living adjustment (COLA) work?
Once a year, your Social Security check goes up to keep pace with inflation. The math is straightforward, but the announcement timing surprises most people.
Dr. Ed Weir, PhD · 20 years inside Social Security · "Former" Sergeant, USMC
Updated April 2026
How does the Social Security cost-of-living adjustment (COLA) work?
The Social Security cost-of-living adjustment, or COLA, is an annual percentage increase to benefits based on the change in the Consumer Price Index for Urban Wage Earners. SSA announces the COLA in October each year, and it takes effect with the January benefit payment.
When you're ready for Medicare — usually at 65
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Here's what to do, in 4 steps.
Here's how to track your COLA, anticipate the impact on your check, and plan for years it disappoints.
1. Watch for the October announcement
SSA announces next year's COLA in mid-October. Sign up for SSA news alerts so you're not relying on the news cycle to tell you. The number will be on ssa.gov/cola the same day it drops.
SSA news & COLA archive ›2. Calculate your January check
Multiply your current monthly benefit by the new COLA percentage and add it back to today's check. SSA mails individual COLA notices in early December with the exact figure, and the same number shows up in your my Social Security account.
my Social Security account ›3. Account for Medicare Part B premium changes
If Medicare Part B premiums go up, the dollar amount can eat into your COLA. The hold-harmless rule protects most beneficiaries from a net decrease, but high-income enrollees on IRMAA, late enrollees, and dual-eligibles paying Part B through Medicaid are not protected.
Medicare Part B costs ›4. Update your tax planning
A higher benefit can push some retirees over the combined-income thresholds that make Social Security partially taxable. Run the IRS combined-income test before tax season — it's a 30-second worksheet but most people skip it.
SSA retirement taxes planner ›The COLA in numbers
Which of these sounds more like you?
How the COLA hits you depends on your other benefits, your tax bracket, and your Medicare status.
When does SSA announce the COLA?I want to know the date, not just the season
SSA announces the next year's COLA in the second or third week of October every year. The exact day depends on when the Bureau of Labor Statistics releases the September CPI-W reading — SSA can't compute the COLA until that number lands, and BLS publishes it in mid-October.
The 2026 COLA was announced October 24, 2025, and confirmed at 2.8 percent. SSA posts it to ssa.gov/cola the same morning, and individual notices go out by mail and in my Social Security accounts in early December.
I've seen people refresh ssa.gov for two weeks every October waiting for the number. Don't — sign up for SSA email alerts and the announcement comes to you the moment it's posted.
How is the COLA actually calculated?I want the formula, not the marketing version
SSA averages the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) for July, August, and September of the current year. It compares that average to the same three-month average from the prior year (or, if there was no COLA last year, to the last year a COLA was paid).
The percentage difference, rounded to the nearest 0.1 percent, is the COLA. The statutory authority is Section 215(i) of the Social Security Act, codified at 42 USC 415(i). For 2026, comparing Q3 2024 to Q3 2025 CPI-W produced a 2.8 percent increase.
If you want the source data, the BLS CPI-W series is CWUR0000SA0 and SSA shows its working at ssa.gov/oact/cola/colasummary.html. Talk to a benefits planner if you need the calculation tied to a specific filing decision.
Will Medicare eat my COLA?I want to know what actually lands in my account
Most retirees on Social Security have their Medicare Part B premium pulled directly from their monthly check. If Part B goes up faster than your COLA in dollar terms, the net deposit can shrink — except the hold-harmless rule (42 USC 1395r(f)) caps Part B's premium increase at the dollar value of your COLA, so the net check can't go down for most beneficiaries.
Hold-harmless does NOT apply if you pay IRMAA (high-income surcharge), if you enrolled in Medicare for the first time during the year, or if Medicaid pays your Part B premium for you. In those cases, the full Part B increase comes through.
Don't get caught by this — if you're new to Medicare or you crossed into IRMAA last year, the hold-harmless protection doesn't apply, and your January deposit can come in lower than expected.
What if the COLA is zero?I remember years with no increase
The COLA cannot be negative. If CPI-W declines or stays flat year over year, COLA is set at zero percent and benefits don't drop. The most recent zero-COLA years were 2010, 2011, and 2016.
In a zero-COLA year, Medicare Part B premiums also can't rise for hold-harmless beneficiaries (the same statute), so most retirees see flat checks rather than smaller ones. Premiums catch up the next year a COLA is paid.
I'm a flashlight, not a courtroom — if you're budgeting for next year, plan for the COLA SSA announces in October. Don't bet on a number from a forecaster in March.
Will my COLA make my Social Security taxable?I want to know if I'll owe more this year
A COLA increases your gross Social Security income, which feeds into the IRS combined-income test. If your combined income (adjusted gross income plus tax-exempt interest plus half your Social Security) crosses into the taxable range, up to fifty percent or eighty-five percent of your benefit becomes taxable.
The combined-income thresholds in IRS Publication 915 don't index for inflation, so each year's COLA can move more retirees into a higher taxable bracket. This is why some retirees feel like the COLA didn't help — the IRS took some of it back.
Don't get caught by this — the combined-income thresholds (twenty-five thousand and thirty-four thousand dollars for single filers) have not been adjusted since the 1980s. Every COLA pushes more retirees into the taxable zone.
Does COLA work the same for SSI?I'm on SSI or know someone who is
SSI receives the same COLA percentage as Social Security retirement and disability. The federal benefit rate (FBR) for individuals and couples adjusts every January with the COLA. State supplements that some states pay on top of the federal SSI benefit follow each state's own rules.
One timing quirk: SSI's January payment is delivered on December 31 of the prior year (because January 1 is a federal holiday and SSI rules push the date earlier rather than later). So SSI recipients see the COLA-adjusted check the day before retirement beneficiaries do.
I've seen this confuse a lot of dual-eligible families. The SSI deposit lands one day earlier than the retirement check, and that's normal — it's not a system error.
I'm helping a parent plan for next yearAdult child running the numbers for mom or dad
If you're helping a parent budget, the December COLA notice is the document you want — it shows the new gross benefit, the Medicare Part B premium being deducted, and the net deposit. SSA mails it; it also posts in their my Social Security account if they have one set up.
Watch three things: any IRMAA bracket they may have crossed (look at last year's tax return), whether they're new to Medicare this year (no hold-harmless protection), and whether the COLA pushed them above a state property-tax exemption income limit. These three together explain almost every “my COLA disappeared” question I get from adult children.
I've spent twenty years explaining the December COLA notice to families. Pull it up first — it answers eighty percent of the questions before you have to call SSA.
I'm not collecting yet — does COLA still affect me?Pre-retiree planning ahead
Short answer: no, not directly. Your pre-claim Primary Insurance Amount (PIA) is calculated using the Average Wage Index (AWI), not the CPI-W COLA. AWI updates the bend points and indexes your past earnings each year until you file. COLA only starts applying to your benefit after you become entitled (typically the year you turn 62, even if you delay claiming).
If you're delaying past 62, your benefit grows from delayed retirement credits and from each year's COLA layered on top. Both compound. SSA explains the AWI series at ssa.gov/oact/cola/awidevelop.html.
If you're not yet collecting and want to understand how your future benefit grows, the calculation page walks through AWI, bend points, and delayed credits step by step.
COLA ripples through your other benefits.
Your COLA isn't just a Social Security number. It moves SSI, VA compensation, and the income limits on programs that don't index. Here's where to look next.
Medicare
Most retirees pay Medicare Part B directly out of their Social Security check. Part B premium changes can offset some or all of the COLA; the hold-harmless rule protects most beneficiaries from a net decrease, but not high-income enrollees, late enrollees, or dual-eligibles.
SSI
SSI recipients receive the same COLA percentage as Social Security beneficiaries. The federal benefit rate adjusts each January, and the January payment lands on December 31 because of the federal-holiday rule.
SNAP
SNAP gross-income limits update each October separately from COLA. A higher Social Security check can push some seniors above SNAP eligibility — if you're close to the limit, you may qualify for less, or qualify with a smaller monthly amount, after the COLA hits.
LIS / Extra Help
The Low-Income Subsidy (Extra Help) for Medicare Part D has income and resource limits that update each year. You may qualify after a COLA pushes you under the threshold, or you may lose eligibility if you cross above it — SSA reviews automatically, but checking your status saves surprises.
VA Compensation
VA disability compensation, dependency and indemnity compensation, and VA pension all receive a COLA tied to the Social Security mechanism by statute (38 USC 5312). Veterans see the same percentage increase as Social Security beneficiaries each January.
Property tax exemptions
Many state and county senior property tax exemptions and freezes have income limits that don't adjust for inflation. A larger COLA can push you over an unindexed limit and cost the exemption. You may qualify for a hardship reapplication — check your county assessor's site each spring.
Everything people ask me
What is the 2026 Social Security COLA?
The 2026 Social Security COLA is 2.8 percent. SSA announced it on October 24, 2025. The increase applies to Social Security retirement, disability, and survivor benefits beginning with the January 2026 payment, and to SSI federal benefit rates starting with the December 31, 2025 deposit.
When does SSA announce the COLA each year?
SSA announces the COLA in mid-October every year, after the Bureau of Labor Statistics releases the September CPI-W reading. The 2026 number was announced October 24, 2025. Sign up for SSA email alerts at ssa.gov/news to receive the announcement the same morning it's posted.
How is the Social Security COLA calculated?
SSA averages the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) for July, August, and September of the current year, and compares that average to the same three-month average from the prior year (or the last year a COLA was paid). The percentage increase, rounded to the nearest 0.1 percent, is the COLA. Statutory authority: Section 215(i) of the Social Security Act, 42 USC 415(i).
When does the COLA take effect?
The COLA is effective with the December benefit, which is paid in January. So the 2026 COLA first appears in January 2026 retirement and disability checks. SSI recipients see it one day earlier — December 31, 2025 — because the federal-holiday rule moves the SSI January payment to the prior business day.
Will Medicare Part B premium increases cancel out my COLA?
Sometimes, but rarely entirely. The hold-harmless rule (42 USC 1395r(f)) caps any Part B premium increase at the dollar value of your COLA, so for most beneficiaries the net Social Security check can't go down. The exceptions are high-income enrollees subject to IRMAA, late enrollees in their first year of Medicare, and dual-eligibles whose Part B premium is paid by Medicaid. Those three groups can see Part B increases pass through in full.
Can the Social Security COLA be negative?
No. By statute, the COLA cannot be negative. If CPI-W declines or stays flat year over year, the COLA is set at zero percent and benefits do not drop. The next year SSA compares to the last year a COLA was actually paid, not the year before, so beneficiaries don't lose ground.
Why was the COLA zero in some years?
When CPI-W in the third quarter is the same as or lower than the prior reference quarter, the COLA is zero. The most recent zero-COLA years were 2010, 2011, and 2016, all driven by falling energy prices that pulled CPI-W down. Benefits stayed at the prior year's level rather than dropping.
Does COLA affect SSI the same way?
Yes. SSI receives the same COLA percentage as Social Security retirement and disability benefits. The federal benefit rate (FBR) for individuals and couples adjusts each January. The only difference is timing: the SSI January payment is delivered on December 31 of the prior year because of the federal-holiday rule.
Will my COLA increase make my Social Security taxable?
It can. The IRS combined-income test (IRS Publication 915) uses thresholds that have not been indexed for inflation since the 1980s. Each year's COLA pushes a few more retirees over the line where up to 50 percent or 85 percent of benefits become taxable. Run the worksheet in IRS Publication 915 each January to see where you stand.
Do future retirees get a COLA on their PIA before they file?
No — and this trips up almost everyone. Before you file, your Primary Insurance Amount (PIA) grows through the Average Wage Index (AWI), which updates the bend points and indexes your past earnings each year. COLA only starts applying once you become entitled to benefits (the year you turn 62, even if you delay claiming). After that, COLA layers on top of any delayed retirement credits.
Sources
Every figure and rule on this page is verified against primary sources. Last verified 2026-04-27.
- The Social Security COLA is announced by SSA each year, typically in mid-October, after the Bureau of Labor Statistics releases the September CPI-W reading. —ssa.gov(verified 2026-04-27)
- The COLA takes effect with the December benefit payable in January. SSI's January payment is delivered on December 31 of the prior year due to the federal-holiday rule. —ssa.gov(verified 2026-04-27)
- The COLA is based on the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers). —ssa.gov(verified 2026-05-08)
- The COLA formula compares the average CPI-W for the third quarter of the current year (July, August, September) to the same quarterly average from the prior year, or the last year a COLA was paid. The … —ssa.gov(verified 2026-05-08)
- The 2026 Social Security COLA is 2.8 percent. SSA announced it on October 24, 2025, and it applies to benefits beginning with the January 2026 payment. —ssa.gov(verified 2026-04-27)
- The COLA cannot be negative. If CPI-W declines or stays flat year over year, the COLA is set at 0 percent and benefits do not drop. —ssa.gov(verified 2026-05-08)
- The most recent zero-COLA years were 2009, 2010, and 2015. —ssa.gov(verified 2026-05-08)
- The SSI federal benefit rate receives the same COLA percentage as Social Security and adjusts each January. —ssa.gov(verified 2026-04-29)
- The pre-claim Primary Insurance Amount (PIA) calculation uses the Average Wage Index (AWI) for bend points and earnings indexing, not the COLA. Future retirees receive AWI-driven adjustments before … —ssa.gov(verified 2026-04-29)
- SSA mails individual COLA notices in early December showing each beneficiary's exact new monthly benefit amount. The same notice is also available in the my Social Security online account. —ssa.gov(verified 2026-04-29)
- SSA's national phone line for Social Security and COLA questions is 1-800-772-1213. Hours are Monday through Friday, 8 a.m. to 7 p.m. local time. —ssa.gov(verified 2026-04-29)
- Hold-harmless does not apply to: high-income enrollees subject to IRMAA, beneficiaries enrolled in Medicare for the first time during the year, and dual-eligibles whose Part B premium is paid by … —ecfr.gov(verified 2026-05-08)
- The Medicare Part B hold-harmless rule protects most Part B enrollees whose premium is deducted from a Social Security benefit from a net decrease in Social Security caused by a Part B premium … —law.cornell.edu(verified 2026-04-29)
- VA pension under 38 USC 1521, 1541, and 1542 and dependency and indemnity compensation for parents under 38 USC 1315 receive an automatic annual COLA tied to the Social Security mechanism by 38 USC … —law.cornell.edu(verified 2026-05-08)
- Higher COLAs can push more of a retiree's Social Security into taxable income through the IRS combined-income test. The combined-income thresholds (25,000 dollars and 34,000 dollars for single filers; … —irs.gov(verified 2026-04-29)
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