Every fall, Social Security's cost-of-living adjustment (COLA) makes headlines as a single percentage — 2.8% for 2026, confirmed and official. What the headline number doesn't show is what actually lands in a retiree's bank account once the Medicare Part B premium, which is deducted directly from most people's Social Security checks, is subtracted from the increase.
The 2026 COLA: 2.8%, confirmed
The Social Security Administration has confirmed a 2.8% COLA for 2026 — a real, locked-in adjustment, not an estimate. For a retiree with a $2,000/month benefit before the adjustment, 2.8% works out to a $56/month increase, bringing the gross benefit to $2,056/month. That's the number that shows up in the announcement. It's not, for most retirees, the number that actually shows up as extra cash in their account.
Where the Medicare Part B premium comes in
For the large majority of Social Security beneficiaries enrolled in Medicare, the Part B premium is deducted directly from the Social Security check before deposit — the retiree never sees that portion of the gross benefit at all. The standard 2026 Part B premium is $202.90/month. If that premium rose from the prior year by, say, $15/month, that $15 comes directly out of the COLA increase before the retiree ever sees it. A $56/month gross COLA increase, minus a $15/month premium increase, nets out to a $41/month actual increase in the deposited check — meaningfully smaller than the 2.8% headline suggests, though still a genuine increase.
A worked example, side by side
Take a retiree with a $1,800/month gross benefit in the prior year, paying the standard Medicare Part B premium, netting $1,800 minus their premium as their actual deposit. After a 2.8% COLA, their gross benefit rises to $1,850.40 — a $50.40 increase. If their Part B premium also rose that year (Medicare premiums adjust annually, independent of the Social Security COLA), the NET increase they actually see is the $50.40 gross COLA increase minus whatever the premium increase was — in a year where premiums rise close to the COLA dollar amount, the retiree can end up seeing only a small fraction of the announced percentage as real, spendable increase.
Why the 2027 estimate isn't a real number yet
Early-year market estimates for 2027 have floated in the 3.7%-3.8% range, based on inflation trends through mid-2026. That figure is NOT official — the SSA doesn't announce the real, confirmed COLA until October of the prior year (so October 2026 for the 2027 benefit year), calculated from a specific formula tied to actual measured inflation data through the third quarter. Treat any pre-October figure, including the 3.7%-3.8% range circulating now, as a planning estimate that could move in either direction before the real announcement.
Common mistakes
Budgeting the full announced COLA percentage as spendable cash, without subtracting the Medicare premium change, is the most common oversight — the NET increase in the actual deposited check is what matters for a household budget, not the gross percentage. The second is treating a pre-October COLA estimate for the following year as a confirmed number. The third is forgetting that higher-income retirees may also face IRMAA surcharges on top of the standard Part B premium, further reducing their net COLA increase beyond what the standard-premium math above shows.