How long until a machine or tool pays for itself?
Divide what the equipment costs by the extra money it brings each month, from savings or from what extra work leaves after its own costs. In the example, a $12,000 machine that brings $450 a month after its running costs pays back during month 27. It pays only if that comes before the machine wears out.
Principle and explanation
Payback in months = cost ÷ what the equipment brings each month after its own running costs. This is the book's own arithmetic. Count only what changes because of it: outside work you no longer buy, or what new jobs leave after their own costs, not their full price. If it brings less at first, add up the months one by one instead of dividing once.
Worked example
Illustrative scenario. These are fictional inputs, not customer results.
A print shop considers a $12,000 cutting machine. It would save $400 a month of outside cutting and bring jobs that leave $100 a month after their own costs. Blades and power cost $50 a month, so it brings $450, and $12,000 ÷ $450 ≈ 26.7: it pays back during month 27. The shop expects the machine to last five years, well beyond the 27 months it needs.
| Each month | Amount |
|---|---|
| Outside cutting no longer bought | $400 |
| New jobs after their own costs | $100 |
| Blades and power | −$50 |
| What the machine brings | $450 |
What this does not show
- It ignores loan interest and offers no advice on loans or investments. It also counts money saved two years from now as fully as money saved today.
- Amounts leave out sales tax you only collect and pass on to the state; income tax stays outside.
- The monthly amount is an estimate; check it against real savings after a few months. The count cannot say whether the cash for the machine is free to spend now.
First step
Write the equipment's full cost and, from quotes and your records, what it would save or bring each month after the costs of the extra work. Divide, then compare the months with its expected life.
Sources
- Penn State Extension: Partial Budgeting for Agricultural Businesses (opens in a new tab)Penn State Extension's guide for agricultural businesses counts only the changes in income and expenses a decision would cause: added returns, reduced costs, added costs and reduced returns. It does not account for the changing value of money over time. For effects more than a year or two ahead, it points to net present value, which discounts later amounts.
- Introduction to Business (SUNY OER on Lumen Learning): The Break-Even Point (opens in a new tab)Contribution margin is the portion of revenue not consumed by variable cost. It goes to covering fixed costs and then profit.