The basic payback formula
Payback months equal the equipment's net cost divided by its monthly gain. Net cost includes the price, delivery, installation and training, minus any trade-in or sale of old equipment. Monthly gain is the added gross profit or savings after new running costs. The result is how many months of gain it takes to recover the money spent.
Payback months = (price + delivery and installation + training − trade-in) ÷ monthly gain
Example: a machine costs $60,000, installation runs $2,500 and training $1,000, and the old machine sells for $3,500. Net cost is $60,000. With a monthly gain of $3,000, payback is $60,000 ÷ $3,000 = 20 months. These are illustrative numbers to show the arithmetic, not a quote or a forecast. Plug in your own figures from real quotes and your own records.
Step 1: Build an honest monthly gain
Monthly gain comes from four places: added output you can sell, labor you really save, outsourcing you stop buying, and waste you avoid. Subtract the equipment's own running costs. Use your own records for each input, and if a number depends on new customers you do not have yet, discount it.
- Added output: extra units or jobs sold × gross profit per unit or job
- Labor saved: hours saved × loaded hourly wage, only if the hours come off payroll or move to billable work
- Outsourcing avoided: what you pay vendors today for work the equipment brings in-house
- Running costs: maintenance, consumables, insurance, power
Example: 400 added units at $6 of gross profit ($2,400), plus 40 labor hours saved at $25 ($1,000), plus $400 of outsourcing avoided, minus $800 of running costs, equals a monthly gain of $3,000. Illustrative only.
| Month | Cumulative gain | Paid so far (down + payments) | Cumulative net cash |
|---|---|---|---|
| 3 | $9,000 | $14,770 | −$5,770 |
| 6 | $18,000 | $19,540 | −$1,540 |
| 12 | $36,000 | $29,080 | $6,920 |
| 24 | $72,000 | $48,160 | $23,840 |
| 36 | $108,000 | $67,240 | $40,760 |
Step 2: Add the financing
With financing, simple payback is not enough. Subtract the monthly payment from the monthly gain to see what the equipment nets while you are paying for it. If that number is positive from the first month, the equipment carries itself. Then add up net cash over time, including any down payment, to see when you are ahead.
Monthly net while financed = monthly gain − monthly payment
Cumulative net cash at month m = −down payment + (monthly net × m)
Example: you put $10,000 down and finance the rest with an illustrative payment of $1,590 a month for 36 months. Monthly net is $3,000 − $1,590 = $1,410. The down payment is recovered in about 7.1 months. After the term ends, the full $3,000 a month stays with the business. The table shows cumulative net cash at several points. The payment is illustrative, not a quote.
Step 3: Compare payback with the term and the equipment's life
A good equipment investment has a simple payback well inside the equipment's useful life, and a financing term that ends before the equipment wears out. The months of gain left after payback are your real return. If simple payback is close to the useful life, small surprises can erase the return entirely.
Example: a machine expected to work productively for seven years, or 84 months, with a 20-month simple payback leaves about 64 months of gain after its cost is recovered. The same machine with a 70-month payback leaves only 14 months, so one bad year could mean it never pays back. Illustrative figures. For how the term changes the payment and total cost, see equipment financing.
What if the gain is uncertain?
Run the calculation at your base estimate and at lower estimates. Find the break-even gain, the smallest monthly gain that still covers the payment, and ask how confident you are of reaching it. If the equipment only works at your most optimistic estimate, consider a smaller machine, used equipment or waiting.
Break-even monthly gain = monthly payment
Example: with a $1,900 payment and a $3,000 base-case gain, monthly net is $1,100. If the gain comes in 25 percent lower, at $2,250, net falls to $350. At 40 percent lower, $1,800, the equipment no longer covers its payment and costs $100 a month. The equipment needs to reach about 63 percent of the base estimate just to break even. Illustrative only.
Common payback mistakes
The most common mistakes are using revenue instead of gross profit, counting labor hours that never leave payroll, ignoring the ramp-up while staff learn the equipment, and leaving out installation downtime. Each makes payback look shorter than it will be. Tax effects are a separate question for your tax professional, not an input to assume.
- Using the selling price of added output instead of the gross profit on it
- Counting rated machine capacity instead of work you can actually sell
- Skipping the first months, when output is often lower
- Forgetting tooling, software subscriptions or a power upgrade
- Building an assumed tax benefit into the payback
If you are weighing whether to buy now or save up first, read the cost of waiting to buy equipment.
Frequently asked questions
What counts as monthly gain from equipment?
Monthly gain is the added gross profit from output you can sell, plus labor and outsourcing costs the equipment really removes, plus waste avoided, minus the equipment's running costs. It is not the revenue from added output. Base each input on your own records, such as current backlog, wage costs and vendor invoices.
Should the payback period be shorter than the financing term?
It helps but is not required. What matters most is that monthly gain exceeds the payment from the start, so the equipment carries itself. A simple payback shorter than the term means the equipment has earned back its cost before the last payment. Either way, the term should end before the equipment's useful life does.
How do I include financing cost in payback?
Subtract the monthly payment from monthly gain to get monthly net while financed, and track cumulative net cash including any down payment. The financing cost itself is total repaid minus the amount financed. Compare total gain over the term with total repaid, and make sure gain wins by a comfortable margin.
What is a reasonable payback period for equipment?
There is no single standard. A reasonable payback is one comfortably shorter than the equipment's useful life, with enough months of gain afterward to justify the risk. Many owners want more room for equipment whose gain is uncertain or that may become outdated quickly, and accept less room for proven, long-lived equipment.
What if the equipment's gain is uncertain?
Calculate the break-even gain, which is the monthly payment, and compare it with lower estimates of what the equipment will produce. If the investment only works at your best-case estimate, reduce the risk by choosing a smaller or used machine, making a larger down payment, or waiting until demand is confirmed.
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Updated September 14, 2026 · Roifunder Funding Team