Social Security COLA 2027 Calculator
Estimate your 2027 Social Security cost-of-living adjustment (COLA) and your new monthly benefit. Based on the SSA's CPI-W methodology with 3 inflation scenarios. Updated April 2026 to reflect current CPI trends ahead of the official October 2026 announcement.
| Current 2026 Monthly Benefit (gross) | — |
| COLA Applied | — |
| 2027 Gross Monthly Benefit | — |
| 2026 Medicare Part B Premium | — |
| 2027 Medicare Part B Premium (est.) | — |
| 2026 Net Benefit (current) | — |
| 2027 Net Benefit (estimate) | — |
| Annual Net Increase | — |
How the Social Security COLA Is Calculated
The Social Security cost-of-living adjustment (COLA) is calculated each October by comparing the average Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) for July-August-September of the current year against the same quarter the year before. If CPI-W rose, beneficiaries get the percentage increase starting with the December check (paid in January). If there is no increase or a decline, benefits stay flat (source: ssa.gov/cola).
The 2026 COLA, announced October 2025, was 2.5%. The 2027 COLA will be announced in October 2026 based on CPI-W readings through September. Current 2026 inflation trends suggest a similar 2.5-3.0% range, though sticky service-sector inflation could push it higher (source: bls.gov).
Why Net Benefit May Not Match the Headline COLA
Most retirees have Medicare Part B premiums automatically deducted from their Social Security check. When Part B premiums increase faster than COLA, the net check increase shrinks. The 2026 standard Part B premium is $185, up 5.9% from 2025. CMS typically announces 2027 Part B in early November 2026.
For a $2,500 monthly benefit with a 2.8% COLA but $9 Part B increase, the gross goes up $70 but the net only rises $61. Over a year that is $732 in extra purchasing power — useful but easily eroded by rising medical and grocery costs. Use this calculator's net field to see your actual take-home increase.
What CPI-W Misses About Senior Costs
The CPI-W index used for COLA tracks expenses of working urban households, weighted heavily toward food, transportation, and rent — but lightly toward healthcare. Seniors' actual spending patterns lean heavier on healthcare, which has historically inflated faster than the broader economy. Some economists advocate the SSA switch to CPI-E (Experimental Index for the Elderly), which would have given larger COLAs in many years (source: bls.gov CPI-E research).
For optimizing your benefit start age, see our Social Security breakeven calculator. For Medicare income-based premiums, check the IRMAA Medicare calculator.
What If COLA Is Wrong for Your Spending
If your personal inflation rate exceeds CPI-W (e.g., heavy healthcare or rent costs), your purchasing power actually declines despite the COLA. Strategies: build a separate retirement spending buffer in CDs or short bonds, keep Roth IRA assets growing tax-free for late-life expenses, and consider downsizing housing to free up cash. Review your benefit annually after each October COLA announcement.
Last updated April 2026. Sources: ssa.gov/cola, bls.gov/cpi, cms.gov Medicare.