Financial Intelligence Lab Tools that teach your first real money decisions.
MVP Prototype

Cost of Waiting Calculator

This tool asks one simple question:

If someone starts at age 20 and waits 10 years instead, what changes by age 65?

It compares two timelines using the same monthly amount and the same example return assumption.

Start-now scenario
Starts at the first age entered.
Wait scenario
Starts after the waiting period.
Both scenarios
Stop at the same comparison age.

Educational prototype only. This tool uses simplified user-entered assumptions and does not recommend when to invest, how much to contribute, or what return to expect.

Inputs

Enter a simple comparison

Use example values or a simple scenario. The calculator runs locally in your browser and does not store or send inputs.

What do I enter?

Use this tool like a sentence:

  • Start at age [20].
  • Wait [10] years.
  • Compare until age [65].
  • Add [$200] each month.
  • Use [6%] as an example annual return.

The calculator turns "wait 10 years" into a second start age automatically.

years

This is when the start-now scenario begins. Example: 20.

years

This creates the wait scenario. Example: entering 10 means the wait scenario starts 10 years later.

years

Both scenarios stop at this same age. Example: 65.

This same monthly amount is used in both scenarios.

%

This is a simplified return assumption used only for the model. It is not a prediction or recommendation.

Your comparison

Example: Start at 20. Wait 10 years. Compare until 65.

This means comparing age 20 to age 30, with both timelines stopping at 65.

Educational context

Example annual return assumptions

The annual return input is an example assumption. It is not a forecast or recommendation. Different assumptions show how sensitive the model is to the rate entered.

  • 0% return: no-growth structure example
  • 3% return: lower-return example
  • 6% return: moderate-return example
  • 10% return: broad U.S. stock-market historical reference example

The 10% example is included only as a broad historical reference often associated with long-run S&P 500 discussions. It is not a forecast, guarantee, or recommendation. Actual market returns vary widely and can be negative.

These buttons only fill example return assumptions. They are not recommendations.

Example scenarios

Example assumptions

These buttons fill example assumptions. They are not recommendations.

Assumptions

Assumptions used in this prototype

  • Monthly amounts are constant.
  • Monthly amounts are added at the end of each month.
  • Annual return is user-entered and constant.
  • No starting balance is included.
  • No employer match is included.
  • No taxes are included.
  • No fees are included.
  • No inflation adjustment is included.
  • No monthly amount increases are included.
  • No withdrawals are included.
  • No market volatility is included.
  • No guarantee is made that any return will occur.
  • This is a simplified educational prototype.
Limitations

What this does not do

  • This is not investment advice.
  • This is not retirement advice.
  • This is not savings advice.
  • This is not tax advice.
  • This is not a recommendation.
  • This is not a projection.
  • This does not account for market volatility, taxes, fees, inflation, or real-life cash-flow changes.

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Was anything confusing about the start age, waiting years, compounding difference, assumptions, or explanation?

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