A goal-based framework — not a generic rule of thumb.
Most investment advice gives you a percentage to follow. The right amount is the one that connects to what you're actually trying to achieve.
The Situation
Investment contribution amounts cannot be set correctly without knowing the goal they are serving. Retirement in 40 years requires a different monthly amount than retirement in 20. Investing to replace income requires a different target than investing to supplement it. The goal is the input — the amount is the output.
A contribution rate is not a financial goal. It is the mechanism that reaches one . Define the destination before calculating the vehicle speed.
— Worthune Decision Framework
Finding Your Number · Steps 1 & 2
Estimate your target annual spending in retirement (in today's dollars). Multiply by 25 — this is the portfolio size that, at a 4% withdrawal rate, could sustain that spending indefinitely. This is your investment target.
Define the targetWork backwards from your target: at your expected average return (commonly 6–7% real), over your time horizon, what monthly contribution reaches the target? This is your baseline required investment — not a generic percentage.
Work backwards from the goalCalibrating the Amount · Steps 3 & 4
If your current contribution meets or exceeds the required amount: you may have flexibility. If your current contribution falls short: calculate how many months of delay each year of underfunding represents. Make the gap tangible.
Make the gap tangibleMaximize contributions to 401(k) and IRA before taxable accounts. Contribution limits reset annually. If your required amount exceeds tax-advantaged limits, the overflow goes to a taxable brokerage account.
Use all tax-advantaged space firstProtecting the Amount · Steps 5 & 6
Set up automatic investment transfers on the same day as your paycheck. Any gap between income arrival and investment transfer is an opportunity for competing spending to claim those funds.
Automate on paydayIf your current contribution is below the required amount, plan the escalation path. Increasing by 1–2% of income per year typically closes most gaps within 3–5 years without a significant lifestyle impact.
Close the gap systematicallyAfter the Work
After connecting your contribution to your goal:
Your contribution rate supports your target timeline. Focus on protecting it and escalating with income.
The gap is quantified. A systematic escalation plan closes it without requiring a large immediate increase.
Calculate your retirement target and required monthly contribution. That number should drive your savings rate — not a generic percentage.
The right amount is the one that reaches your specific destination on your specific timeline.
Next Step
Use Worthune's investment goal calculator to connect your retirement target to a specific monthly contribution amount — and see the gap if one exists.
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