Evaluate payback as an investment method
Assess payback's speed and simplicity against its omission of later cash flows and time value.
Exam scope and assessment notes
Cambridge International AS & A Level Accounting 9706, 2026–2028 syllabus, Version 2. This topic covers future net cash flows, payback, ARR, NPV, IRR and supported investment decisions. Discounted payback and questions involving a residual value at the end of a project are excluded by Cambridge. Practice is self-checked, not an official Cambridge grade. Full timed Papers 1–4 and human subject-teacher review remain outstanding.
Before you begin
- Use AS Topics 1.5–1.6 for profit, depreciation and financial analysis, and Topic 2.1 for contribution. Keep accounting profit, project cash flow and the time value of money distinct.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Why might a business with tight cash reserves examine payback?
What you will learn
- Explain practical advantages
- Identify decision limitations
- Use payback with other evidence
Why managers use it
Payback is relatively easy to calculate and explain. It highlights how quickly the initial cash outflow may be recovered and can help screen projects when liquidity or forecast uncertainty matters.
A maximum acceptable period makes the rule clear, but it reflects management's chosen threshold. A short-payback project may pass the rule without being the most valuable project.
Why recovery time is incomplete
Payback ignores cash flows after recovery and does not discount for the time value of money. It may favour early receipts despite weak later returns.
Use it alongside NPV and supporting evidence. Consider scale, risk, strategic fit and the reliability of cash-flow forecasts.
Pause and explain
Two projects have the same payback, but one has larger later inflows. What should the analyst do?
Worked example
Project A pays back in 2 years, then generates little. Project B pays back in 3 years but produces substantial later cash. What can payback conclude?
Show the worked solution
- It can compare recovery time with a stated maximum.
- It omits receipts after each recovery point.
- Other methods and the full cash-flow forecasts are needed to compare value.
Answer Payback favours A on recovery speed but cannot show that A creates more value. Compare later cash flows and NPV.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A manager says a 2-year payback proves a project is profitable overall. Give one reason this is incomplete.
Give me a hint
Consider which flows the calculation stops counting.
Compare my reasoning
- Payback stops when the initial outflow is recovered.
- It ignores the amount and timing of later inflows.
- It does not discount for the time value of money.
A 2-year payback measures recovery time, not total profitability or value.
Look for these in your work
- Meaning identified
- Later flows included
- Limitation explained
A costs $80,000 and returns $40,000 each year for 2 years. B costs $80,000 and returns $40,000 each year for 3 years. Both pay back in 2 years. What does payback miss?
Give me a hint
Compare the cash flow after recovery.
Compare my reasoning
- Both recover $80,000 by year 2.
- B has an additional $40,000 year-3 inflow.
- Basic payback gives both the same recovery time.
Payback reports 2 years for both but omits B's additional year-3 receipt.
Look for these in your work
- Recovery shown
- Later flow identified
- Limitation linked
A start-up must protect near-term cash and choose the project expected to add most value. How should it use payback?
Give me a hint
Match payback to liquidity and another method to value.
Compare my reasoning
- Use payback against the stated liquidity limit.
- Use NPV to compare discounted future net cash flows.
- Review forecast risk and non-financial constraints.
Use payback as a liquidity screen, then compare NPV and wider evidence.
Look for these in your work
- Liquidity use clear
- Value method added
- Evidence balanced
Common mistakes
- Calling the shortest payback automatically best
- Claiming payback includes every project cash flow
- Confusing liquidity with total value
What can you explain now?
Which is a limitation of payback?
Compare with the explanation
It ignores cash flows after recovery
Basic payback stops counting after the initial investment is recovered.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name two limitations of payback and one question it can answer.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.