How much to save for retirement is one of the most important financial questions you can ask — and one that most people answer with a vague rule of thumb rather than a calculation grounded in their actual situation. “Save 15% of your income.” “Have a million dollars.” “Replace 80% of your salary.” These guidelines are useful starting points but they obscure the enormous variation in retirement needs across different people, retirement ages, spending patterns, and expected Social Security benefits. This guide explains how to calculate your actual retirement savings target and what to do depending on where you currently stand relative to it.
The 25x Rule: Your Portfolio Target
The most useful framework for calculating a retirement savings target is the 25x rule, derived from the 4% safe withdrawal rate research: accumulate 25 times your expected annual retirement spending, and a diversified portfolio should sustain approximately 30 years of withdrawals without depleting. If you expect to spend $60,000 per year in retirement, you need $1.5 million. If you expect $80,000 per year, you need $2 million. The beauty of this framework is that it’s anchored to your specific spending rather than to generic income multiples that may or may not reflect your actual lifestyle.
The expected annual spending figure is the most important — and most uncertain — input in this calculation. Most financial planners suggest that retirement spending is typically 70% to 90% of pre-retirement spending, because some costs fall (commuting, work wardrobe, retirement savings contributions themselves) while others rise (healthcare, leisure). But the right number for you depends heavily on the lifestyle you expect in retirement, whether you’ll have a paid-off mortgage, where you’ll live, and how long you expect to live. Being deliberately conservative in your spending estimate — using your actual current spending rather than an optimistic future projection — produces a more reliable target.
Factor in Social Security
Social Security significantly reduces the portfolio size required for most Americans, because it provides guaranteed inflation-adjusted income that reduces the amount your portfolio needs to generate. If your Social Security benefit at full retirement age is $2,000 per month ($24,000 per year) and your expected spending is $60,000 per year, your portfolio only needs to fund $36,000 per year — not $60,000. At the 25x rule, that’s $900,000 required rather than $1.5 million. Check your personalised Social Security estimate at ssa.gov/myaccount — it shows your projected benefit at different claiming ages based on your actual earnings history. The difference between claiming at 62 and 70 is approximately 76% more monthly income — a significant variable in your portfolio target calculation.
The Savings Rate Benchmarks
Working backward from a retirement target to a required monthly savings rate depends on your current age, current savings, expected return, and target retirement age. As a general framework: starting at 25 with nothing saved and targeting retirement at 65, a 10% to 15% savings rate at a 7% real return is typically sufficient to reach the 25x target on a median income. Starting at 35 with nothing saved requires 15% to 20%. Starting at 45 with nothing saved requires 25% or more — a much more demanding rate that many people find requires significant lifestyle restructuring.
The Fidelity benchmarks are a simpler reference point: aim to have saved 1x your annual salary by 30, 3x by 40, 6x by 50, 8x by 60, and 10x by 67. These benchmarks assume a 15% savings rate throughout your career, retirement at 67, and replacing 45% of pre-retirement income from savings (with Social Security covering the rest). They’re calibrated to median income levels and standard retirement patterns — if you plan to retire earlier or later, spend more or less, or have a higher or lower Social Security benefit, the appropriate multiples shift accordingly.
If You’re Behind: What Actually Helps
Most Americans are behind on retirement savings by these benchmarks — a Vanguard survey found the median 401(k) balance for people in their 50s is approximately $60,000, far below the 6x salary target. Being behind is common and not irreversible, but it does require honest assessment of what’s actually adjustable. The variables you can change: contribution rate (the most direct lever), retirement age (working two to three years longer has an outsized effect — more accumulation time plus shorter withdrawal period), expected retirement spending (modest reductions in spending targets dramatically reduce the required portfolio size), and claiming age for Social Security (delaying to 70 increases monthly benefits by approximately 76% compared to claiming at 62).
Catch-up contributions are available to workers 50 and older: in 2025, the 401(k) limit increases to $31,000 (from $23,500) and the IRA limit increases to $8,000 (from $7,000). These additions allow meaningful acceleration of accumulation in the final working decade. A worker who maximises catch-up contributions for 15 years — from age 50 to 65 — at 7% annual return contributes approximately $465,000 in additional retirement savings beyond standard contribution limits. The later you start addressing a savings shortfall, the more important maximising tax-advantaged space becomes.
The Right Way to Think About This Number
Your retirement savings target isn’t a fixed number but a range shaped by adjustable variables — many of which you control. The person who calculates their target, finds themselves significantly behind, and then adjusts their savings rate, plans a slightly later retirement date, and checks their Social Security projection has moved from anxiety to a specific plan. The person who avoids the calculation because the number might be discouraging is in the same position financially but without the clarity to make effective decisions. The retirement savings number is worth knowing, however uncomfortable the current gap — because the gap is only fixable when it’s visible.
