Payback period calculator, 2026/27

How this is calculated

The simple payback period divides the initial cost of an investment by the net annual cash inflow it is expected to generate, giving the number of years needed to recover the outlay. Where the annual cash inflow varies from year to year, the more accurate approach is to accumulate the actual cash flows year by year until the running total reaches the initial cost.

This calculator also shows a simple year-one return on investment, the annual cash inflow divided by the initial cost, which is effectively the inverse of the payback period and gives a quick sense of the annual return rate implied by the payback figure.

Payback period deliberately ignores what happens after the investment has paid for itself and does not discount future cash flows, which is why it is normally used alongside, not instead of, measures like net present value or internal rate of return for larger capital decisions.

Why directors use payback period

It is simple to calculate and explain, which makes it a popular first screen for capital spending decisions, particularly for smaller purchases like machinery, vehicles or software where a full discounted cash flow analysis would be disproportionate. A shorter payback period generally indicates lower risk, since the capital is at risk for less time.

It is especially useful when comparing two ways of achieving the same outcome, such as buying equipment outright versus leasing it, where the payback period on the incremental cost helps decide which route recovers its extra cost fastest.

Limitations to bear in mind

Payback period ignores the time value of money, so £12,000 received in year one is treated the same as £12,000 received in year three, even though money now is worth more than money later. It also ignores all cash flows after the payback point, so it can favour a quick-payback investment over one with a longer payback but much greater total return.

For significant capital decisions, particularly where the investment life extends well beyond the payback period, it is worth combining this measure with a discounted cash flow calculation and considering the corporation tax relief available through capital allowances on the asset.

What is a good payback period for a small business investment?

There is no universal answer, but many small companies look for payback within 2-3 years on equipment purchases, reflecting the risk of the investment and how quickly the underlying asset or market might change.

Does payback period consider the time value of money?

No, the simple payback method treats cash received in different years as equally valuable. The discounted payback period method adjusts for this by discounting future cash flows before accumulating them, giving a longer, more conservative payback figure.

How should I treat capital allowances when using payback period?

Capital allowances reduce the corporation tax the company pays, which increases the net cash the investment effectively generates. For a more accurate payback figure, include the tax saving from allowances such as the annual investment allowance in your annual cash inflow.

What if the annual cash inflow varies year to year?

Build a simple table of the cash inflow for each year and add a cumulative running total. The payback period is the point at which that cumulative total first reaches or exceeds the initial cost, interpolating within the year it happens for a fractional answer.