Save first, spend what's left.

Pay Yourself First is the principle of saving a fixed percentage of income before any discretionary spending. Automatic transfers on payday move 10-30% into savings before the rest becomes visible for spending. This calculator projects what that habit grows to over time.

A 4,000 monthly income saving 15% automatically over 25 years at 7% return grows to roughly 487,000. Increase to 20% savings rate and the total is 649,000. The monthly saving amount is modest relative to income, but compounded over decades it transforms financial outcomes.

The mechanism matters more than the percentage. Setting up automatic transfer on payday means the money never enters the spending account. This removes the willpower factor - you can't overspend money you never see. Most successful savers use this exact pattern rather than trying to save whatever's left at month end.

Run it with sensible defaults

Using monthly income of 4,000, savings percentage of 15%, time horizon of 25, investment return of 7%, the calculation works out to 486,043.02. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Monthly Income, Savings Percentage, Time Horizon, and Investment Return — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

How the math works

Monthly saving = income × percentage. Standard annuity future value formula applied monthly. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

Revisiting the plan

Budgets are living documents. Re-run this whenever income changes, housing changes, or you notice a recurring overrun in a category. A budget from two years ago is probably already wrong.

What this doesn't capture

Budgets are snapshots of intent. Real spending includes irregular costs: birthdays, one-off repairs, the occasional bad week. Tracking actual spending for a month before fixing any budget usually reveals 10–20% that didn't make the original plan.