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How to Use This Retirement Gap Calculator
Our retirement gap calculator helps you see whether your current savings are on track to fund the retirement you want, or whether a shortfall is developing. Enter your current savings, expected contributions, and desired retirement income to reveal the gap between where you are and where you need to be. Click Ask AI for a personalized plan to close that gap based on your age and savings rate.
The 4% Withdrawal Rule
The 4% rule is the most widely cited guideline for how much you can safely spend from your retirement savings each year without running out of money. It originated from a study by financial advisor William Bengen, who found that retirees could withdraw 4% of their initial portfolio in the first year of retirement, then adjust that amount for inflation each subsequent year, and have their money last at least 30 years across a wide range of historical market conditions. In practical terms, a $1 million portfolio supports about $40,000 of annual withdrawals in the first year. The rule assumes a balanced portfolio of stocks and bonds and a roughly 30-year retirement, so those retiring very early may want to use a more conservative rate such as 3% to 3.5%. While no rule is guaranteed, the 4% rule remains a reliable starting point for estimating how large a nest egg you need to sustain your desired lifestyle.
The 25x Savings Target
The 25x rule is simply the 4% rule expressed from the opposite direction, and it gives you a clear savings goal. Because withdrawing 4% per year is the inverse of saving 25 times your annual spending (since 100 divided by 4 equals 25), you can estimate your retirement number by multiplying your expected annual expenses in retirement by 25. If you expect to spend $60,000 per year, your target nest egg is $1.5 million. If you can live on $40,000 per year, you need $1 million. This framing is powerful because it shows that your required savings depend directly on your spending, not just your income, so every reduction in your planned retirement expenses lowers your target by 25 times that amount. Cutting $10,000 from your annual budget reduces the nest egg you need by $250,000, which is why controlling lifestyle costs is one of the most effective ways to reach financial independence sooner.
Social Security and Catch-Up Contributions
Social Security provides a foundation of guaranteed, inflation-adjusted income that reduces how much you must save on your own. The average retirement benefit is about $1,900 per month in 2026, or roughly $22,800 per year, though your personal amount depends on your earnings history and the age at which you claim. Delaying benefits past your full retirement age up to age 70 increases your monthly check by about 8% per year, while claiming early at 62 permanently reduces it, so the timing of your claim is a significant decision. For those who feel behind, the tax code offers catch-up contributions to people age 50 and older, allowing you to save extra beyond the standard limits in your 401(k) and IRA each year. These higher limits can meaningfully accelerate your savings in the crucial final working decade, and combined with the fact that it is genuinely never too late to start, they give older savers a real opportunity to narrow a retirement gap.
Frequently Asked Questions
How much do I need to retire?
A common approach is the 25x rule: multiply your expected annual retirement spending by 25. If you plan to spend $60,000 per year, you need about $1.5 million; if you can live on $40,000, you need about $1 million. This target pairs with the 4% withdrawal rule. Social Security income reduces the amount you must save yourself, so subtract your expected benefits from your annual spending before applying the multiplier.
What is the 4% rule?
The 4% rule states that you can withdraw 4% of your retirement portfolio in your first year of retirement, then adjust that dollar amount for inflation each year, with a high probability that your savings last at least 30 years. A $1 million portfolio supports about $40,000 in the first year. Those retiring very early often use a more conservative 3% to 3.5% to account for a longer retirement horizon.
Am I too old to start saving for retirement?
No, it is never too late to start. Savers age 50 and older can make catch-up contributions that allow them to invest extra beyond the standard limits in their 401(k) and IRA, accelerating their progress in the final working years. Even starting in your 50s or 60s, consistent saving combined with Social Security and delaying retirement a few years can build a meaningfully more secure future.