If you live on an SSDI check, the number everyone’s been revising all summer is finally narrowing down. Forecasters now put the 2027 Social Security cost-of-living adjustment somewhere between 3.4% and 3.6%, depending on which independent estimate you check. That range comes from the Consumer Price Index for Urban Wage Earners and Clerical Workers, known as CPI-W, which is the only inflation measure the Social Security Administration is legally permitted to use for this calculation.
Two of the three months that decide the final number are already locked in. July’s CPI-W came in at 327.104 and August’s at 328.481, both measured against last year’s third-quarter average. September is the only input still outstanding, and the Bureau of Labor Statistics is scheduled to release it on October 14, the same morning the Social Security Administration is expected to make the official 2027 COLA public.
A mid-threes raise would be the largest SSDI recipients have seen in a few years. The adjustment ran 2.8% in 2026 and 2.5% in 2025, after 3.2% in 2024, so even the low end of this year’s range beats anything beneficiaries have gotten since before 2023’s inflation spike cooled off. On a fixed disability check that already gets stretched across rent, groceries and medical bills, that difference is real money.
How the raise actually lands in your check
The COLA isn’t a flat dollar amount handed out across the board. It’s a percentage applied to your individual benefit, so two people on SSDI with different monthly amounts get different dollar increases even under the exact same percentage. Social Security multiplies your current benefit by the new COLA, then rounds the result down to the nearest whole dollar, which is why your neighbor’s bump might land a few dollars higher or lower than yours even if you both started the year on a similar check.
The increase takes effect with benefits paid in January 2027, not with any payment before that. You won’t have to guess at your new amount, either. The Social Security Administration mails personalized COLA notices in December, and if you’ve set up a my Social Security account, that same notice usually shows up in your online message center before the paper version arrives in your mailbox.
Medicare takes its share before you see the rest
Here’s where the raise shrinks for a lot of SSDI recipients. If you’re enrolled in Medicare, your Part B premium comes straight out of your Social Security check before it ever reaches your bank account, and that premium is set through its own separate process every fall. The current trustees’ projection puts the standard 2027 Part B premium at $209.50 a month, up from $202.90 in 2026, with the Centers for Medicare and Medicaid Services expected to confirm the real figure in November.
Run the numbers on an average SSDI check and you can see how much of the raise that eats. The average disabled worker on SSDI was pulling in $1,630 a month in 2026. A 3.5% COLA on that amount adds roughly $57 a month, and if the Part B premium climbs by its projected $6.60, that’s close to $12 of every $57 gone before you’ve spent a dime of it. It’s not nothing, but it isn’t the full raise either, and anyone enrolled in Medicare should budget off that smaller number rather than the headline percentage.
What changes for the amount you’re allowed to earn
The COLA isn’t the only figure that moves every January. Social Security also adjusts the earnings limits tied to SSDI, and those numbers determine how much you can work before your disability status itself comes into question. The substantial gainful activity threshold, or SGA, is the ceiling on what the SSA considers proof you’re capable of full-time work. For 2026 it sits at $1,690 a month for most beneficiaries and $2,830 a month for people who are statutorily blind, and both figures rise most years because they’re tied to growth in the national average wage, not to CPI-W directly.
The trial work period amount moves on the same schedule. In 2026, any month you earn more than $1,210 counts as one of your nine trial work months, the stretch where you can test a return to work and keep your full SSDI check no matter how much you actually bring home. Both figures typically get announced alongside the COLA in October, so the 2027 versions should land the same week as the raise itself. Knowing where they land matters if you’re weighing part-time work, since crossing the SGA line after your trial months are used up can shut your check off entirely.
Why disability advocates don’t trust this number
CPI-W measures the spending of urban wage earners and clerical workers, which is a reasonable stand-in for a working-age household with a paycheck. It’s a worse stand-in for someone who’s retired or disabled, and advocacy groups have been saying so for decades. People with disabilities and older adults tend to spend a larger share of their income on health care than the working population CPI-W is built around, and health care costs have consistently outpaced general inflation.
The alternative that keeps coming up is the CPI-E, an experimental index built specifically around the spending patterns of people 62 and older. Switching to it would raise the average annual COLA by roughly 0.2 percentage points, which sounds small until you compound it over a decade of benefit checks. Changing the formula isn’t something the Social Security Administration can do on its own. CPI-W is written into federal law as the required measure, so swapping it out would take an act of Congress, and there’s no serious push underway to make that happen soon.
The official 2027 COLA becomes public on October 14, once the September inflation data is in hand. After that, the fastest way to see your own number is through your my Social Security account online, where the notice usually posts before the mailed version arrives.
