Financial Independence Planner
Have a target date for retirement? This calculator shows you the exact savings rate required to hit your goal on time.
A common guideline is 4%. This is the percentage of your nest egg you'll withdraw each year in retirement.
$3,757
You'll need to save this much each month to reach your goal of
$1,500,000 in 20 years.
Both figures are in today's dollars.
Required Savings Rate
72.2%
of take-home income
How this works
Growth is projected using the real (inflation-adjusted) return — the nominal annual return you enter (default 7%), deflated by your inflation input (default 2.5%) — compounded monthly, and every dollar figure is shown in today's purchasing power rather than future inflated dollars.
Solves backward from a target FI date: given current savings, a target number of years, and the real return, it computes the constant monthly contribution (an ordinary annuity) that lands exactly on your FI number at that date.
Key assumptions
- FI number = desired annual retirement income / safe withdrawal rate (default 4%).
- The required savings rate is expressed against take-home income (gross income after the 22%-default effective tax rate), matching the Savings Rate calculator's convention.
What this leaves out
- Sequence-of-returns risk — growth is a constant rate, not a real market path.
- Fees — expense ratios and advisory fees are not deducted from the return.
- Taxes in retirement — withdrawals are treated as spendable in full; account type (traditional, Roth, taxable) is not modeled.
- Income growth — savings and contributions stay flat in real terms.
- Irregular spending — no college costs, home purchases, medical shocks, or windfalls.
Related calculators
A worked example: what a 20-year FI date actually costs
Start with $25,000 invested, an $80,000 gross income taxed at a 22% effective rate, and a goal of financial independence in 20 years. Spending $60,000 a year at a 4% withdrawal rate puts the FI number at $1,500,000, in today's dollars.
Working backwards from that target — the existing $25,000 compounding at the real return, and the monthly contribution treated as an ordinary annuity on top of it — the required contribution is $3,757 a month. Against $62,400 of take-home income, that is a required savings rate of 72.2%.
That figure is the point of the calculator. A 20-year FI date on this income is not a budgeting problem, it is an arithmetic impossibility, and seeing 72.2% is more useful than discovering the gap twelve years in. The three ways out are all visible in the inputs: extend the timeline, lower the spending target that sets the FI number, or raise income. Lowering the target is the strongest of the three, because it shrinks the numerator and the required contribution at the same time.
Frequently asked questions
The required savings rate came out above 100%. Is that a bug?
No — it means the target is unreachable on the inputs given, and the calculator is reporting that honestly rather than clamping to something comfortable. A rate above 100% says the contribution needed exceeds your entire take-home income. Treat it as a signal to change an input: a longer timeline, a lower desired retirement income, or a higher income. The arithmetic will not soften.
Why does the answer barely move when I change the expected return?
Because over a 20-year horizon most of the FI number is built from contributions rather than growth, and the projection runs on the real return — 7% nominal deflated by 2.5% inflation leaves roughly 4.4%, not 7%. Return assumptions dominate long horizons, not medium ones. If tweaking the return moves your plan a lot, your horizon is long enough that the plan is mostly a bet on markets, which is worth knowing.
How is this different from the Savings Rate calculator?
They solve the same equation from opposite ends. Savings Rate takes your contribution and tells you when you arrive; FI Planner takes your arrival date and tells you what to contribute. Use Savings Rate when you want to know where current behavior leads, and FI Planner when the date is fixed — a lease ending, a career change — and the contribution is the unknown.
Is the FI number in today's dollars or future dollars?
Today's dollars. Growth is projected on the inflation-adjusted return, so $1,500,000 here means $1,500,000 of today's purchasing power, not the larger nominal balance a future statement would show. This is also why you should enter your desired retirement income in today's dollars and not inflate it yourself — doing both would count inflation twice and badly overstate the target.
Does this assume I keep contributing the same amount for the whole period?
Yes. The answer is a constant monthly contribution held flat in real terms for the full horizon — the standard annuity solution. Real savings paths are lumpier, and a front-loaded path beats a flat one because early contributions compound longest. Treat the number as the level equivalent of your plan, then check it against reality with the Savings Rate calculator as your actual contributions change.
Sources
- Determining Withdrawal Rates Using Historical Data
William P. Bengen, 1994, Journal of Financial Planning — checked 2026-08-12
The paper that established the '4% rule' — the foundational research this site's safe withdrawal rate defaults trace back to.
- Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable
Philip L. Cooley, Carl M. Hubbard, Daniel T. Walz, 1998, AAII Journal — checked 2026-08-12
The 'Trinity study,' which expands on Bengen across a range of withdrawal rates and portfolio mixes. Only Table 3 in the original paper is inflation-adjusted — the commonly-quoted near-100% success rates come from the nominal-withdrawal Tables 1-2.
- Safe Withdrawal Rate Series
Big ERN, Early Retirement Now — checked 2026-08-12
A practitioner blog, not peer-reviewed — the most detailed public research on SWR sensitivity to horizon length and asset mix.
- State of Retirement Income: 2025
Morningstar — checked 2026-08-12
Forward-looking base-case starting withdrawal rate, cited for context alongside the fixed 4% default this site uses. The ~3.9% figure is search-attested rather than directly confirmed against the source — treat it as a data point, not a recommendation, and worth checking whether a newer edition has superseded it.
- Consumer Price Index
U.S. Bureau of Labor Statistics — checked 2026-08-12
Backs the long-run inflation figures behind this site's 2.5% default inflation input.
*The calculations provided are for illustrative purposes only and should not be considered financial advice. Please consult with a qualified financial professional before making any decisions.