Why the replacement rate is under 100%
In retirement you stop saving for retirement, payroll taxes end, commuting and work clothes disappear, and the mortgage is often gone. Those alone usually account for 20–30% of pre-retirement income. Someone who was saving 20% of income needs materially less than someone who was saving 5%, even at the same salary.
Social Security is bigger than people assume
For a median earner, Social Security replaces roughly 35–40% of pre-retirement income, and it is inflation-indexed and lasts for life. Leaving it out of the calculation makes a workable plan look impossible. Get your actual estimate from your Social Security statement rather than guessing — the difference is often tens of thousands of dollars of implied portfolio.
Delaying retirement is the strongest lever
Working two extra years adds two years of contributions, two years of growth, two fewer years of drawdown, and a higher Social Security benefit. Those four effects compound. For someone behind at 55, it usually closes more of the gap than doubling the savings rate would.
The early-retirement adjustment
Retiring before 62 means no Social Security for years, buying health insurance on the open market until Medicare at 65, and funding a longer retirement. Each of those pushes the required portfolio up, and together they typically mean 30× rather than 25× expenses. Set Social Security to zero in the calculator if you are modelling an early exit.
FAQ
How much do I need to retire?
Enough to replace 70–80% of your income when combined with Social Security. On a $95,000 income with $28,000 of expected Social Security, that implies a portfolio near $1.1M using the 4% rule.
What is a good income replacement rate?
Seventy to eighty percent for most people. Higher earners often need less as a percentage because they were saving more and paying more payroll tax; people carrying a mortgage into retirement need more.
Should I include Social Security in my plan?
Yes, using your own statement estimate. Some people prefer to discount it by 20–25% as a hedge against future changes — reasonable, but excluding it entirely overstates what you need by a large margin.
What if I'm behind on retirement savings?
Raise the contribution rate, capture every employer match, use catch-up contributions from 50, and consider working longer. Delay is usually the most powerful of these, and the one people consider last.
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