Social Security COLA 2027 Guide

What Is the Social Security COLA?

The cost-of-living adjustment is an automatic annual increase in Social Security and Supplemental Security Income benefits. Its purpose, in SSA's words, is to ensure that the purchasing power of benefits "is not eroded by inflation." Congress created the automatic COLA in the 1972 Social Security Amendments, and annual COLAs began in 1975. Before that, benefits rose only when Congress passed a specific increase.

The COLA is not discretionary. Nobody at SSA decides how large it should be; the Social Security Act fixes the formula, the price index and the rounding, and SSA announces the result each October once the September inflation figure is out. The increase applies to retirement, disability, spousal, survivor and family benefits, and the federal SSI payment standard rises by the same percentage.

One feature matters for planning: the COLA can be zero, but it can never be negative. In years when the index did not rise (benefits payable in January 2010, 2011 and 2016), there was simply no increase.

How Much Is the 2027 COLA?

The COLA for 2027 is 3.6%. SSA announced it in October 2026 and says it will reach about 76 million people: nearly 72 million Social Security beneficiaries and about 7.3 million SSI recipients (some people receive both).

That is the largest increase since the 8.7% COLA paid from January 2023, and above the 3.2% for 2024, 2.5% for 2025 and 2.8% for 2026. In dollars, SSA estimates the average retired-worker benefit rises from $2,095 to $2,170 a month and an aged couple both receiving benefits from $3,238 to $3,355.

The percentage is the same for everyone, so the dollar increase scales with your benefit: 3.6% of a $1,200 check is about $43 a month, while 3.6% of a $3,500 check is about $126. Your exact figure depends on your primary insurance amount and SSA's rounding, which the Social Security COLA Calculator applies step by step.

How Does the CPI-W Set the COLA?

The Social Security Act ties the COLA to the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), published monthly by the Bureau of Labor Statistics. SSA describes the CPI-W as, by law, the official measure used to calculate COLAs. The formula has three parts:

• Average the third quarter. Add the CPI-W for July, August and September and divide by three, rounded to the nearest 0.001.
• Compare to the last COLA year. Measure the increase against the same third-quarter average from the last year in which a COLA took effect (2025, for this COLA).
• Round to a tenth of a percent. If the rounded increase is zero or negative, there is no COLA.

The computation SSA published: (328.746 - 317.265) / 317.265 x 100 = 3.6 percent. Because only July through September count, inflation earlier in the year affects the COLA only to the extent it is still reflected in the third-quarter price level.

When Will the Increase Show Up?

The 2027 COLA is effective for December 2026. Social Security pays each month's benefit in the following month, so the December benefit, the first one with the increase, arrives in January 2027 on your usual payment date. Before 1983, COLAs took effect with the June benefit; since then they have applied to December benefits paid in January.

SSI works differently. SSI is paid on the first of the month for that month, and because January 1 is a holiday, the January 2027 SSI payment, with the 3.6% increase, is paid on December 31, 2026. People who receive both Social Security and SSI therefore see part of their increase in late December and part in January.

SSA says COLA notices will be available online in the Message Center of most beneficiaries' my Social Security accounts in late November 2026. The notice shows your new benefit amount and any Medicare premium that will be deducted, and it is the figure to rely on over any estimate.

How Does SSA Round Your New Benefit?

Your new check is not your old check times 1.036 to the penny. SSA applies the COLA to your primary insurance amount (PIA), the full-retirement-age benefit your other amounts are built on, and the Social Security Act sets two round-downs:

• Down to the dime. Section 215(i) says an increased amount that is not a multiple of $0.10 "shall be decreased to the next lower multiple of $0.10." That is why a PIA always ends in a zero in the cents column.
• Down to the dollar. Section 215(g) rounds the monthly benefit to the next lower whole dollar, after any reduction and after the Medicare premium deduction.

A worked example: a PIA of $1,862.40 times 1.036 is $1,929.4464. Rounded down to the dime, the new PIA is $1,929.40, and someone who claimed at full retirement age is paid $1,929. Early or late claimers get their claiming percentage of the new PIA: a $2,000.00 PIA becomes $2,072.00, and at 70% (claimed at 62 with a full retirement age of 67) the check is $1,450, up from $1,400.

Because the COLA compounds on the PIA rather than on the rounded check, the cents you never see still matter over time. The COLA calculator lets you enter either your check or your PIA; the PIA route matches SSA more closely.

Will Medicare Part B Take Back Part of the Raise?

For most people on Medicare, the Part B premium is deducted directly from the Social Security check, so the COLA and the premium change arrive together. The 2026 standard Part B premium is $202.90 a month. The 2027 premium is set by the Centers for Medicare & Medicaid Services (CMS), not SSA, and had not been announced as of October 19, 2026. Until it is, any "net raise" figure is a guess, and this site does not publish one.

The hold-harmless rule in Social Security Act section 1839(f) limits the damage for many beneficiaries. If you were entitled to benefits for November and December of the prior year, your Part B premium was deducted from your benefits for December and January, and your premium is not adjusted for income, your premium increase cannot be large enough to make your December benefit after the premium lower than your November benefit after the premium. In practice it protects long-time beneficiaries with small checks from a net cut. A Part B late enrollment penalty is a separate surcharge that rises with the premium every year; see the Medicare Late Enrollment Penalty Guide.

Hold-harmless does not cover everyone. It does not apply to people whose premium is adjusted for income (the income-related monthly adjustment amount, or IRMAA), to new Medicare enrollees whose premium was not yet being deducted, or to people whose premium is not taken from their Social Security check. If you pay IRMAA, estimate the surcharge with the IRMAA Calculator and read the IRMAA Medicare Surcharge Guide.

Do You Get COLAs Before You Claim?

Yes, from the year you turn 62. SSA applies COLAs to your PIA beginning with the COLA effective for December of your year of eligibility, whether or not you have started benefits. SSA's own example: for a worker who becomes eligible in 2027, "the first COLA this individual could receive is the one effective for December 2027."

So a person who turns 62 in 2026 receives this 3.6% increase on their PIA even if they plan to wait until 70. Delaying does not forfeit COLAs; the delayed-retirement credits and the COLAs both build on the same PIA. Before the eligibility year, your earnings record is indexed to national wage growth instead, which is a separate mechanism explained in the Social Security Benefit Formula guide.

This is a common source of confusion in claiming decisions. People sometimes claim early to "lock in" a COLA, which is unnecessary. Compare claiming ages on their own merits with the Social Security Break-Even Calculator and the Claiming Age Guide.

Can a COLA Increase the Tax on Your Benefits?

It can. Under IRC section 86, up to 50% of Social Security benefits become taxable when provisional income (other income plus half of your benefits) passes $25,000 for a single filer or $32,000 for a married couple filing jointly, and up to 85% above a second tier of $34,000 and $44,000. Those thresholds have never been indexed for inflation since they were set in 1983 and 1993.

A COLA adds to your benefit, so half of the increase is added to provisional income. For most retirees the effect is small, but someone sitting just under a threshold can see a portion of the benefit become taxable for the first time, even though their real purchasing power did not change. Rerun your estimate with the Social Security Tax Calculator and see how the tiers work in Is Social Security Taxable.

What Else Changes for 2027?

SSA announces several other amounts alongside the COLA. The taxable maximum, quarter of coverage, earnings-test limits, SGA and trial-work amounts rise with the national average wage index rather than the CPI-W, which is why their percentages differ from 3.6%. The SSI federal payments rise with the COLA itself, the maximum benefit follows each year's benefit formula, and the tax rate is set by law.

The higher earnings-test limits matter if you work while collecting before full retirement age; see the Social Security Earnings Test Guide. The higher taxable maximum means workers earning above $184,500 pay Social Security tax on more of their 2027 wages.

How Does 3.6% Compare With Past COLAs?

Over the full history since 1975, the largest COLA was 14.3% (July 1980) and there were three years with none (January 2010, 2011 and 2016). The 8.7% COLA paid from January 2023 was the largest in four decades. The spread is the point: when you project benefits forward, test a low, a middle and a high assumption rather than assuming any single year repeats.

Practitioner Insight (LMN Tax Inc.)

Real-World Scenarios

When the Rules Differ

• SSI rounding. SSI does not round each person's payment the same way: SSA increases the unrounded annual federal amount, divides by 12 and rounds down to the dollar, then reduces it by countable income. State supplements follow state rules.
• Earnings-test withholding. If benefits are being withheld because you work before full retirement age, the COLA still increases your benefit, and the higher 2027 limits apply to your 2027 earnings.
• Family maximum. Benefits payable on one worker's record are capped by the family maximum, which also rises with COLAs.
• Government pension offsets. The Social Security Fairness Act, signed January 5, 2025, ended the Windfall Elimination Provision and the Government Pension Offset; SSA says December 2023 is the last month either applied, so COLAs now apply to the full unreduced benefit for affected public-sector retirees.
• Income tax withholding. If you elected withholding on Form W-4V, the same percentage now applies to a larger benefit, so the dollar amount withheld rises.

Frequently Asked Questions

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