How Your Social Security Benefit Is Calculated
For many people, Social Security is one of the most valuable retirement income sources they will ever receive. Yet most workers have no idea how their benefit is actually determined. The formula can look complex at first glance, but once you understand the moving parts, it becomes much easier to see how your work history impacts your future income.
At its core, Social Security is based on your highest 35 years of earnings, adjusted for inflation, and then run through a formula designed to replace a larger percentage of income for lower earners than higher earners.
Step 1: Social Security Looks at Your Highest 35 Years
The Social Security Administration reviews your lifetime earnings record and selects your 35 highest earning years. If you worked fewer than 35 years, the missing years are counted as zeroes.
Those earnings are then indexed for wage inflation, meaning earnings from decades ago are adjusted upward to reflect changes in national wage levels. This helps create a fair comparison between earnings from different eras.
This is why someone who earned $40,000 in 1990 is not treated the same as someone earning $40,000 today.
Step 2: Calculating AIME
After adjusting your top 35 years of earnings, Social Security totals those wages and converts them into a monthly average called your Average Indexed Monthly Earnings (AIME).
This AIME becomes the foundation of your retirement benefit.
Step 3: Applying the Benefit Formula
Once your AIME is determined, Social Security uses a formula called the Primary Insurance Amount (PIA) formula.
For someone first eligible in 2026, the formula is:
- 90% of the first $1,286 of AIME
- 32% of AIME between $1,286 and $7,749
- 15% of AIME above $7,749
These thresholds are called bend points.
What Are Bend Points?
Bend points are income thresholds where the percentage applied to your earnings changes.
They exist because Social Security is designed to be progressive. Lower-income workers receive a higher percentage replacement of income, while higher earners receive a lower percentage on dollars above the thresholds.
That means the first dollars of your average earnings receive the most generous treatment, while higher earnings receive a smaller replacement percentage.
Bend Points Change Every Year
The bend points are adjusted annually based on national wage growth. As wages rise over time, the thresholds rise too.
For example:
- 2025 bend points: $1,226 and $7,391
- 2026 bend points: $1,286 and $7,749
This helps keep the formula aligned with inflation and long-term wage trends.
Example #1: Worker Averaging $100,000 Per Year
Assume a worker had earnings averaging $100,000 annually over their career and their AIME is $8,333.
Using the 2026 formula:
- 90% of first $1,286 = $1,157
- 32% of next $6,463 = $2,068
- 15% of remaining $584 = $88
Estimated monthly PIA = $3,313/month
That would be the approximate benefit payable at Full Retirement Age before early filing reductions or delayed retirement credits.
Example #2: Worker Averaging $50,000 Per Year
Assume another worker averaged $50,000 annually and has an AIME of $4,166.
Using the same formula:
- 90% of first $1,286 = $1,157
- 32% of remaining $2,880 = $922
Estimated monthly PIA = $2,079/month
Why This Matters
Notice the worker earning twice as much does not receive twice the Social Security benefit.
That’s intentional. Social Security is designed to provide stronger income replacement for moderate and lower earners while still rewarding higher lifetime earnings.
Your Claiming Age Still Matters
Your PIA is your base benefit at Full Retirement Age. If you claim early, your benefit may be reduced permanently. If you delay past Full Retirement Age (up to age 70), your monthly benefit can increase significantly.
That decision alone can mean hundreds or even thousands of dollars per month over retirement.
Final Thoughts
Understanding your Social Security benefit can help you make smarter decisions about:
- When to retire
- Whether to keep working
- How additional earnings may help
- Whether delaying benefits makes sense
- How Social Security fits into your broader retirement plan
Need Help Maximizing Your Benefit?
At Otium Financial Planners, we help individuals and families make informed retirement income decisions—including Social Security claiming strategies, tax planning, and building a reliable retirement paycheck.
If you'd like to understand how your own numbers work, we’d be happy to help.