A building owner is undertaking a weatherization project.

The payback period measures how long it takes for a project’s cumulative cash inflows to recover the initial investment. It is a simple capital budgeting technique commonly used as a preliminary screening tool. Although it does not account for the time value of money or cash flows beyond the cutoff period, it is useful for assessing liquidity and risk exposure.

Cumulative cash flows are calculated as follows:

End of Year 1: $125,000

End of Year 2: $250,000

End of Year 3: $390,000

End of Year 4: $530,000

The initial investment of $410,000 is recovered sometime during Year 4. Because the question instructs to round up, the payback period is reported as 4 years. Financial management textbooks emphasize that while payback should not be used alone to accept or reject projects, it provides insight into how quickly invested capital is recovered, which is especially relevant for projects with uncertainty or liquidity constraints.