CalcMyFin

Investing & Growth

Cost of Waiting Calculator

Every year you wait gives your money less time to grow. Compare investing the same amount starting today with starting a few years from now, and see what it would take to catch up.

  • Free, no sign-up
  • Private: runs in your browser
  • Updated September 2026

Your plan

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How to use the cost of waiting calculator

  1. Enter how much you can invest each month.
  2. Add the average yearly return you expect.
  3. Enter how many years until you'll need the money, for example until retirement.
  4. Choose how many years you might wait before starting.

How it's calculated

Both scenarios use the future value of regular monthly investments:

FV = M × [(1 + i)n − 1] ÷ i

where M is the monthly amount, i the monthly return and n the number of months invested. Waiting shortens n. The catch-up amount is the monthly investment that reaches the start-now balance in the shorter time.

Example

Investing $300 a month at an average 7% for 35 years could grow to about $540,316. Wait 10 years and invest the same amount for 25 years, and you'd have about $243,022, a cost of roughly $297,295. To catch up after waiting, you'd need to invest about $667 a month.

Tips

  • The earliest dollars you invest have the most time to grow, so small amounts started early can beat larger amounts started late.
  • If you can't invest much today, start with something and increase it with every raise.
  • Automate your monthly investment so waiting never becomes the default.
  • Returns aren't guaranteed. Use a conservative figure for planning.

Frequently asked questions

Why does waiting cost so much?
Growth builds on itself. Money invested early has more years for its gains to produce further gains, so the last years of a long investment period often add the most.
Is it ever sensible to wait?
Building an emergency fund and clearing any debt first are common reasons to hold off. Waiting to 'time the market' is harder, because no one can reliably predict short-term moves.
What does the catch-up amount mean?
It's how much you'd need to invest each month after waiting to end up with the same balance as starting today. It's usually much more than the original monthly amount.
What return should I use?
For a long-term diversified portfolio many people plan with 5–7% a year. Try a few rates to see a range.
Investment Growth calculatorHow your investments could grow over time.Retirement calculatorProject your nest egg and retirement income.FIRE (Early Retirement) calculatorYour FIRE number and when you could retire early.

Sources

This calculator provides educational estimates only and is not financial, tax, legal or investment advice. Results depend on the assumptions you enter; actual market prices, returns and tax rules may differ.