How much a single person needs to retire comes down to one formula: your expected annual spending in retirement, minus Social Security, divided by 0.04 (the 4% rule). The result is your retirement savings target.
Let’s run those numbers across different spending levels — and figure out whether you’re on track.
The Core Formula
$$\text{Retirement Target} = \frac{\text{Annual Spending} - \text{Annual Social Security}}{0.04}$$
| Annual Retirement Spending | Expected SS Benefit | Portfolio Gap | Savings Target |
|---|---|---|---|
| $30,000 | $14,000 | $16,000 | $400,000 |
| $40,000 | $16,000 | $24,000 | $600,000 |
| $50,000 | $18,000 | $32,000 | $800,000 |
| $60,000 | $20,000 | $40,000 | $1,000,000 |
| $75,000 | $22,000 | $53,000 | $1,325,000 |
| $90,000 | $24,000 | $66,000 | $1,650,000 |
Social Security estimates are illustrative averages. Use your personal SSA estimate for accuracy.
Step 1: Estimate Your Retirement Spending
Most people spend 70–85% of their pre-retirement income in retirement. Fixed costs often drop (no more mortgage if paid off, no commuting costs, no retirement contributions needed), but healthcare and leisure can increase.
Estimate your annual retirement budget:
| Expense Category | Working Life | Expected Retirement |
|---|---|---|
| Housing (rent/mortgage) | $___ | $___ |
| Food | $___ | $___ |
| Transportation | $___ | $___ |
| Healthcare + insurance | $___ | $___ |
| Utilities | $___ | $___ |
| Entertainment/travel | $___ | $___ |
| Other | $___ | $___ |
| Total | $___ | $___ |
If you’re not sure, $40,000–$55,000/year is a reasonable planning estimate for a single person in a mid-cost U.S. city with no mortgage in retirement.
Step 2: Estimate Your Social Security Benefit
Your Social Security benefit depends on your 35 highest-earning years. Get a precise estimate at ssa.gov/myaccount.
Approximate annual benefits by lifetime income (claiming at 67, 2024 estimates):
| Career Average Annual Earnings | Est. Monthly SS at 67 | Est. Annual SS |
|---|---|---|
| $30,000 | ~$1,050 | ~$12,600 |
| $45,000 | ~$1,450 | ~$17,400 |
| $60,000 | ~$1,750 | ~$21,000 |
| $80,000 | ~$2,100 | ~$25,200 |
| $100,000 | ~$2,400 | ~$28,800 |
Benefits are indexed to inflation and depend on your full work history. Always verify with SSA.
Step 3: Calculate Your Savings Target
Once you have your spending estimate and Social Security estimate:
- Annual spending need from savings = Retirement spending − Social Security
- Portfolio target = Annual need from savings ÷ 0.04
Example for a single person earning $65,000:
- Expected retirement spending: $48,000/year
- Expected Social Security at 67: ~$20,000/year
- Portfolio must cover: $28,000/year
- Savings target: $28,000 ÷ 0.04 = $700,000
Are You On Track? Benchmarks by Age
At your current age, you should have approximately:
| Age | Savings vs. Annual Income |
|---|---|
| 30 | 1x |
| 35 | 2x |
| 40 | 3x |
| 45 | 4–5x |
| 50 | 6x |
| 55 | 7–8x |
| 60 | 9x |
| 65 | 10–12x |
Based on Fidelity’s benchmarks, adjusted slightly upward for singles who don’t have spousal income support.
Example check: A 40-year-old earning $70,000 should have ~$210,000 saved to be on track.
How Much to Save Per Month to Hit Your Target
If retirement is years away, use these monthly contribution estimates to reach common targets:
To reach $700,000 by age 65, starting from $0 (7% average annual return):
| Starting Age | Monthly Contribution Needed |
|---|---|
| 25 | ~$330/month |
| 30 | ~$480/month |
| 35 | ~$710/month |
| 40 | ~$1,090/month |
| 45 | ~$1,770/month |
| 50 | ~$3,150/month |
Starting early cuts the required monthly contribution by more than half. This is why the 20s and early 30s savings rate matters so much.
The “Enough?” Quick Check
Ask three questions:
- What do I want to spend yearly in retirement? → $_____
- What will Social Security pay me? → (check ssa.gov) → $_____
- What does my portfolio need to cover? → Subtract, then divide by 0.04
If your current savings trajectory (at current contribution rate and expected return) reaches that number by your target retirement age, you’re on track. If not, the levers are: save more, retire later, spend less in retirement, or some combination.
Does $500K, $750K, or $1M Work?
| Savings | 4% Annual Withdrawal | + Avg. SS ($19,200/yr) | Total Annual Income |
|---|---|---|---|
| $400,000 | $16,000 | $19,200 | $35,200 |
| $500,000 | $20,000 | $19,200 | $39,200 |
| $750,000 | $30,000 | $19,200 | $49,200 |
| $1,000,000 | $40,000 | $19,200 | $59,200 |
| $1,250,000 | $50,000 | $19,200 | $69,200 |
| $1,500,000 | $60,000 | $19,200 | $79,200 |
For a single person with a paid-off home and no debt in retirement:
- $500K is workable in a low-cost area with modest lifestyle
- $750K is comfortable for most mid-cost U.S. cities
- $1M is financially secure for most scenarios
- $1.25M+ provides real flexibility and a buffer for healthcare surprises
When You’re Behind: The Catch-Up Options
If your current savings are significantly below these benchmarks:
| Lever | Impact |
|---|---|
| Increase savings rate by 5% | Significant impact over 10+ years; start immediately |
| Work 2 more years | Adds contributions, lets portfolio grow, reduces withdrawal years |
| Delay Social Security to 70 | Up to 32% more per month vs. FRA; massive for lifetime total |
| Reduce planned retirement spending | Lower target = lower required savings |
| Relocate to lower cost area in retirement | Can reduce annual spending by $10,000–$25,000 |
| Part-time work in early retirement | Even $15,000–$20,000/year reduces portfolio withdrawals dramatically |
Bottom Line
A single person’s retirement number is $600,000–$1,000,000 for most middle-income scenarios — once Social Security is factored in. Get your personal SSA estimate, estimate your retirement spending honestly, and run the formula. If you’re behind, the most powerful moves are: increase your savings rate now, and delay Social Security to 70 if your health allows.