Scenario
How does Social Security change the estimated retirement date?
Last updated: October 2026
Specific retirement question
This case compares 3 claiming contexts in one framework: early claim, full retirement age, and delayed claim. The question is how these choices change required portfolio draw behavior and the probability of running out of modeled funds.
Again, this is not advice. It is a scenario exploration for better assumption discipline.
Inputs used
- Current age 43
- Retirement ages compared 60, 62, 64
- Current savings $650,000
- Monthly contribution $1,800
- Expected return 7.0%
- Inflation 3.0%
- Annual spending $63,000 in today’s dollars
- Withdrawal rate 3.5%
- Volatility 17%
- Calculator Social Security assumption flat $21,600 a year from age 67. Claiming at 62 or 70 is discussed but not modeled.
Result summary
Retire at 60: seven bridge years before the modeled benefit. Projected portfolio about $2.72M, about 60% modeled success.
Retire at 62: five bridge years. Projected portfolio about $3.16M, about 66% modeled success.
Retire at 64: three bridge years. Projected portfolio about $3.66M, about 72% modeled success, though lifestyle tradeoffs rise.
The FIRE target is about $1.80M in today's dollars ($63,000 ÷ 3.5%) in every case, because each retirement age falls before the modeled benefit starts. Claiming at 62 would shorten the bridge but lower the benefit, and claiming at 70 would raise it. Test those choices with your own SSA estimate, since the calculator uses one fixed benefit and start age.
Tradeoff analysis
- Retire earlier: more years of savings replacement required before benefits begin.
- Claim later: larger modeled income floor later, helpful for late-career spending pressure.
- Bridge-year planning: the period before benefits is where success can collapse if spending is fixed too tightly.
- Risk and longevity: the right timing is often tied to health and workability assumptions.
Monte Carlo interpretation
This scenario shows the shape of distributions rather than one promised age. Some claim-age combinations have tighter early-year buffers and lower success percentages, while delayed claims can improve simulated longevity in later years.
No single output should be used as the final answer. Use these paths as comparisons of claim timing, not guarantees.
Sensitivity notes
- Reducing bridge spending by 10% can materially improve early survival rates across all claim ages.
- Higher volatility increases the gap between early and delayed claim paths.
- If inflation is higher, the penalty for early claiming without flexibility becomes stronger.
- If one spouse has meaningful guaranteed income, combined planning should be tested separately.
Common mistakes
- Treating the modeled Social Security amount as an official statement.
- Testing only one claim age before setting spending and portfolio strategy.
- Ignoring bridge risks and assuming stable spending through every early retirement year.
Scenario links