Pay Yourself First Projector
Example: Monthly take-home income: 5000 $ · Auto-save rate (what you commit to): 15 % · Leftover save rate (historical average): 8 % · Annual investment return: 7 % · Years to project: 20 yr
| Automation dividend (extra wealth) | $182,324 |
| Auto-save portfolio value | $390,695 |
| Leftover-save portfolio value | $208,371 |
| Auto monthly contribution | $750 |
Worked example
Earning $5,000 a month and auto-saving 15% ($750) for 20 years at 7% grows to $491,521. Saving only what is left over — historically about 8% ($400) — yields $261,878. The automation dividend is $229,643 in extra wealth from a behavioral system change, not a salary increase.
Frequently asked questions
How do I automate savings without accidentally overdrafting?
Schedule the transfer for the day after your paycheck clears — not the payday itself, in case of processing delays. Start with a smaller auto amount and increase it 1% per quarter until you reach your target. Most banks let you schedule recurring transfers to a HYSA for free within their app.
What rate should I enter for 'leftover save rate'?
The average US household savings rate has ranged from 3–8% over recent decades according to Federal Reserve data. If you track your spending, use your actual average from the last 6–12 months. Many people find their leftover rate is half to two-thirds of what they intended to save.
Should I direct the auto-save to a HYSA or a brokerage?
Varies by goal. For goals within 1–3 years, a HYSA preserves principal. For goals 5+ years away (retirement, financial independence), a low-cost index fund in a tax-advantaged account (401k, Roth IRA) typically outperforms over time due to equity growth. Many people run both: HYSA for short-term, brokerage for long-term.
Does the order of operations really matter if the amounts are the same?
Yes. Behavioral finance research (Thaler and Benartzi's 'Save More Tomorrow') shows that people who commit in advance to automatic savings contribute significantly more over time than those who try to save discretionary leftovers. The automation removes the decision — and removes the temptation to skip.