To factor Social Security into an early retirement plan, split your retirement into two phases. In the bridge phase, from the day you stop working until you claim benefits, your portfolio pays for everything. In the Social Security phase, benefits cover part of your spending, so your portfolio only has to cover the rest. Size each phase separately and your target is usually smaller than the classic “25 times spending.”
The risk runs the other way too. Your SSA statement assumes you’ll keep working until you claim, so if you retire at 45, your real benefit will be lower than the estimate. Adjust it first.
Why early retirees need a two-phase calculation #
A standard retirement calculator assumes benefits start almost as soon as work stops. For someone retiring at 45, there may be 17 to 25 years before the first check.
- Bridge phase: starts when you retire and ends when you claim (age 62 at the earliest, 70 at the latest). The portfolio carries all your spending.
- Social Security phase: benefits cover part of your spending for life, adjusted for inflation each year. For 2026 the cost-of-living adjustment was 2.8%, per the Social Security Administration’s 2026 notice.
A worked example #
You’re 45, you want to retire now, and you:
- spend $80,000 a year in today’s dollars
- expect $24,000 a year from Social Security at 67, already adjusted for your early exit (more on that below)
- face a 22-year bridge, from 45 to 67
Ignoring Social Security, the 4% rule says you need $80,000 x 25 = $2,000,000.
Step 1: size the core portfolio #
After 67 your portfolio covers $80,000 − $24,000 = $56,000 a year. At 25 times that:
Core portfolio = $56,000 x 25 = $1,400,000
Step 2: size the bridge fund #
For the 22 bridge years you also need the $24,000 a year that Social Security will cover later. That’s a temporary need, so the bridge fund can spend down to zero. At a conservative 3% real return, the present value of $24,000 a year for 22 years is:
Bridge fund = $24,000 x [1 − 1.03^−22] ÷ 0.03 ≈ $382,500
Step 3: add them up #
$1,400,000 + $382,500 = $1,782,500
Counting Social Security cuts the target by about $217,500. At a $50,000-a-year savings pace, that’s several years of work you might not need.
Why your SSA statement overstates early retirees’ benefits #
The estimates on your Social Security statement assume you keep earning roughly what you earn now until you claim. If you stop at 45, that won’t happen.
Your benefit is based on your 35 highest-earning years, indexed for wage growth. Retire with 20 years of earnings and 15 of those 35 slots are zeros. The good news is that the benefit formula is weighted toward lower average earnings, so the benefit drops less than proportionally. It still drops, and a lot of early retirees underestimate how much.
To get a realistic figure:
- Sign in to your my Social Security account at SSA.gov and review your earnings record.
- Use SSA’s calculators (or a third-party tool that reads your earnings record) to estimate benefits with $0 earnings from your planned retirement date onward.
- Use that lower number in your plan.
When should an early retiree claim Social Security? #
For anyone born in 1960 or later, full retirement age is 67. You can claim as early as 62 or delay to 70, per SSA’s rules on early and delayed claiming:
| Claim at | Benefit vs full retirement age | Effect on your plan |
|---|---|---|
| 62 | About 70% (a 30% reduction) | Shorter, cheaper bridge; smaller check for life |
| 67 | 100% | The baseline in the example above |
| 70 | 124% (8% for each year past 67) | Bigger bridge fund; largest inflation-protected income later |
Two common approaches:
- Keep 62 as a backup. Plan for 67 or 70, but if a market crash hits early in retirement, claiming earlier reduces how much you sell from a depressed portfolio.
- Delay if things go well. If your portfolio does well in your 40s and 50s, delaying to 70 buys the largest inflation-adjusted income available, which protects you if you live into your 90s.
If you claim before full retirement age while still working part-time, the earnings test applies. For 2026, SSA withholds $1 of benefits for every $2 you earn above $24,480. The withheld amount isn’t lost; your benefit is recalculated upward at full retirement age.
Should you plan for Social Security cuts? #
The Social Security trustees project that the retirement trust fund will run short in the 2030s unless Congress changes taxes or benefits. If that happens, incoming payroll taxes would still pay most, but not all, of scheduled benefits.
A common conservative move is to cut your estimated benefit by 20% to 25% in your plan. In the example, planning on $18,000 instead of $24,000 raises the core portfolio to $1.55 million and shrinks the bridge fund to about $287,000, a total of about $1.84 million. Still below the $2 million you’d target by ignoring Social Security entirely.
Step-by-step: build your own Social Security-adjusted target #
- Estimate retirement spending. Include health insurance, which is often the biggest pre-Medicare cost; our guide to health insurance in early retirement covers options.
- Adjust your SSA estimate for zero earnings after you retire, then apply a haircut if you want extra margin.
- Choose a planning claim age. 67 is a reasonable default.
- Size the core portfolio: (spending − adjusted benefit) x 25, or x 28 to 30 for a long retirement. See whether the 4% rule holds for 40 years.
- Size the bridge fund: the present value of the benefit amount over your bridge years at a conservative real return.
- Recheck every year as your earnings record, spending and portfolio change.
Retire Goals doesn’t model Social Security itself, but it covers the pieces. Enter the spending your portfolio must cover after benefits start into its FIRE Number calculator for the core number. Then use Will My Money Last on your bridge fund: enter the balance and the yearly amount it has to supply, and it shows how many years the money covers with withdrawals rising for inflation. If it comes up short of your bridge years, you know which number to grow.
If you’ll also have a pension, the same two-phase approach applies; see how to calculate your FIRE number with a pension.
Frequently asked questions #
Can I use the 4% rule if I’ll collect Social Security later? #
Yes, but apply it only to the spending your portfolio covers for life. Applying 25 times your full spending ignores the income Social Security will provide and makes you over-save. Use the core-plus-bridge split instead.
Will I qualify for Social Security if I retire at 40? #
Probably. You need 40 credits, and you can earn up to four a year. In 2026 one credit takes $1,890 of earnings, so roughly 10 years of work qualifies you. Your benefit will be smaller because of the zero-earning years in your 35-year average.
How does inflation affect the bridge fund calculation? #
If you use a real (after-inflation) return such as 3%, you can do all the math in today’s dollars. Social Security benefits get an annual cost-of-living adjustment, so a benefit estimate in today’s dollars stays roughly comparable over time.
Should I claim at 62 if I retired early? #
Not automatically. Claiming at 62 permanently cuts your benefit by about 30% if your full retirement age is 67. It can make sense if your health or portfolio is weak, or as a backup after a bad market. If you can afford the bridge, delaying generally pays more for a longer life.