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What is the payback period and how is it calculated?

Beginner

Answer

The payback period is the time taken for a project's cumulative cash inflows to recover its initial investment. For even cash flows, payback = initial investment / annual cash inflow; for uneven flows, accumulate inflows until they equal the outlay. It's simple and focuses on liquidity/risk but ignores cash flows after payback and the time value of money.
Invest 100,000; inflow 25,000/yr -> payback = 100,000/25,000 = 4 years.
Real-world example A project recovering its cost in 3 years is preferred over one taking 5, under a payback rule.

Common follow-ups: What are payback's weaknesses? | How is it found for uneven cash flows?