What is a payback period?

Definition

A payback period is how long it takes an investment to return its own cost in cash. On the books, this is a decision metric, not a ledger account and not a line on the Income Statement.

A bakery reads it when a new oven is expected to add extra cash each month. The question is the number of months until that extra cash equals what the oven cost.

It is a clock, not a profit percentage. Return on investment asks how much you gained against the cost; this figure asks how long until the cash is back.

The clock uses cash, not accrual profit. An oven can look profitable on paper while the extra cash is still catching up.

Where it shows up

Balance sheet: Related to the asset sitting there until it is paid back in cash.

P&L: Related to the extra profit, which is not the same clock.

Cash flow: Related to how long until the extra cash covers the outlay.

See also: Return On Investment · Capital Budget · Capital Expenditures

When you look at your reports, this clock does not print as a statement line. It lives in the notes next to a capital-budget item, or on a one-page buy sheet the owners review.

When the figure is short, the extra cash covers the outlay soon. When it is long, the bakery waits years to get the cash back, even if the oven is useful.

The Balance Sheet shows the oven as a fixed assets item from day one. This clock does not wait for the asset to depreciate off the books.

The Income Statement may show extra revenue and extra contribution margin from the new bake capacity. That leftover is not the same as the cash clock.

How it works

Take the cash outlay for the asset. Divide by the extra cash the asset is expected to bring in each month, after the extra costs that come with it.

The usual simple math is cost divided by monthly extra cash. A $12,000 oven that adds $500 of cash a month has a 24-month payback.

Build the clock in this order:

• Take the cash outlay for the asset.
• Divide by the extra cash the asset is expected to bring in each month after the extra costs that come with it.
• If the extra cash is uneven, add months until the running total covers the outlay.
• Use cash that actually arrives, not depreciation expense.

Stay with that clock when you read the number. Do not turn this page into a net-present-value lecture.

Do not use depreciation expense as the monthly extra cash. Depreciation is a book charge; this clock wants cash that actually arrived.

If the extra cash is uneven, add the months until the running total covers the outlay. The even-month shortcut only works when the extra cash is roughly the same each period.

A capital budget is where this clock is often written next to each line. The plan lists the buy; this figure is one reason to say yes or no.

After the buy, you can compare the expected clock to what actually arrived. That check is still this metric, just with real cash instead of the guess.

Example

Mill & Crust Bakery spends $12,000 cash on a deck oven in March. The owners expect the extra bake capacity to add $500 of cash each month after flour, labor, and utilities that come with those extra loaves.

Divide $12,000 by $500. The payback period is 24 months.

The $12,000 left in March as an investing outflow. The $500 a month is extra operating cash, not a second asset.

If the extra cash is only $400 a month, the same oven takes 30 months to return its cost. The clock moved because the cash in changed, not because the oven's book life changed.

If the extra cash is $600 a month, payback is 20 months. Faster extra cash shortens the clock.

The oven's useful life may be ten years. Payback of 24 months only says when the cash is back; it does not say the oven is done.

Common mix-ups

A payback period is not return on investment. ROI is a gain against cost; this figure is a number of months until the cash is back.

A payback period is not net present value. NPV discounts later cash; this clock treats every month's cash as equal.

A payback period is not the asset's useful life. The oven can keep baking for years after the cash is recovered.

Related terms

• Return On Investment: The gain from an investment measured against its cost.
• Capital Budget: The plan for major asset purchases over a period.
• Capital Expenditures: Spending to buy or improve long-lived assets.
• Net Present Value: The value today of an investment's expected future cash flows, net of its cost.
• Free Cash Flow: Operating cash flow left after the capital spending needed to keep running.
• Sensitivity Analysis: Testing how much the outcome changes when one assumption moves.
• Cash Flow Forecast: A forward projection of cash receipts and payments.
• Break-Even Point: The sales level at which total revenue exactly covers total costs.