Social Security benefits are calculated using a specific three-step formula that transforms your lifetime earnings into a monthly payment. For the 2026 tax year, this calculation involves your 35 highest-earning years, national wage indexing, and specific “bend points” that determine the progressivity of your check.

 1. Calculating Your AIME

The first step is determining your Average Indexed Monthly Earnings (AIME).

  • Indexing: The Social Security Administration (SSA) doesn’t just look at the raw dollar amount you earned in 1995. They “index” those past earnings to current wage levels using the National Average Wage Index (which is $69,846.57 for the 2026 eligibility year). This ensures your benefit reflects the standard of living from your working years.
  • 35-Year Average: The SSA takes your highest 35 years of indexed earnings and divides the total by 420 (the number of months in 35 years).
  • Zeros: If you have fewer than 35 years of work, the SSA fills in the remaining years with zeros, which can significantly lower your average.

2. Applying the 2026 Bend Points

Once your AIME is calculated, the SSA applies a progressive formula to find your Primary Insurance Amount (PIA)—the benefit you receive at Full Retirement Age. For those becoming eligible in 2026, the formula uses two “bend points”: $1,286 and $7,749.

The 2026 formula is:

  • 90% of the first $1,286 of your AIME, plus
  • 32% of your AIME between $1,286 and $7,749, plus
  • 15% of any AIME over $7,749.

Example: If your AIME is $5,000, your 2026 PIA would be:

$(0.90 \times 1,286) + (0.32 \times (5,000 – 1,286)) = 1,157.40 + 1,188.48 = \mathbf{\$2,345.88}$

3. Adjusting for Age and COLAs

The final step is adjusting your PIA based on when you choose to claim and adding the annual Cost-of-Living Adjustment (COLA).

  • Filing Age: If you claim at 62, your PIA is reduced by 30%. If you wait until 70, it is increased by 24% through Delayed Retirement Credits.
  • 2026 COLA: For January 2026, a 2.8% COLA was applied to all benefits. If you were already receiving benefits, your check increased by this amount. If you are newly eligible in 2026, the COLA will be applied to your PIA starting in December 2026.
  • Maximums: For 2026, the maximum monthly benefit for someone retiring at Full Retirement Age (67) is $4,152.

Source: Social Security Administration (SSA), “Benefit Calculation Overview” and “Primary Insurance Amount Bend Points for 2026.”