Buyer guide

How to calculate payback on a small online business or SaaS acquisition

Updated 7 October 2026 · About 6 minutes to read

Payback is the number of months of profit it takes to earn back the price you pay. The formula takes one line. The work is in choosing the profit figure you divide by.

The formula, and how it relates to the multiple

Payback in months = price ÷ monthly profit. A listing asking $36,000 with $1,500 of monthly net profit pays back in 24 months.

Marketplaces usually quote the same thing as a multiple. Empire Flippers, which switched from monthly to annual multiples on 8 September 2026, defines the annual multiple as the listing price divided by annual net profit, and says an old monthly multiple converts to an annual one by dividing by 12.¹ So payback in months is simply the annual multiple times 12, and the monthly multiple some older listings still show is the payback figure itself.

For context, the same Empire Flippers post converts the average listing multiples in its 2026 State of the Industry Report: 2.3× annual for typical businesses, 2.6× for premium ones and 1.1× for distressed ones.¹ In months, that is roughly 28, 31 and 13.

Step 1: pick the right profit figure

Empire Flippers says it prices most businesses on the sum of net profit over the last 12 months, times a multiple that usually runs from 1.7× to 5× or more.² Its valuation guide adds that businesses with rapid growth or decline may be priced on a shorter window.³ That matters to you as a buyer: a price set on the best three months of a growing business gives a shorter payback on paper than the year behind it supports.

Use this order:

1. Trailing 12 months of net profit, divided by 12. It smooths out seasonality and one-off months.
2. A shorter average, only if you know the window. Ask which months it covers and why the seller chose it.
3. Last month alone, as a check, not a basis. Compare it with the 12-month average. A last month well below the average is a question to ask before anything else.

Acquire.com, for example, asks sellers to enter trailing 12-month gross revenue and net profit as well as last month's revenue and net profit,⁴ so you can make that comparison straight from the listing.

Do not divide by revenue or by MRR. Revenue ignores costs, and MRR is a run rate of subscription revenue, not profit. Acquire's own seller help says revenue multiples may suit a business that is reinvesting all its profit into growth, and that profit is probably the better basis in all other cases.⁵

Step 2: adjust the profit to what you will actually keep

A listing's net profit is the seller's number. Before you divide, turn it into yours:

• Price the owner's time. If the seller works on the business unpaid, you either do that work or pay someone. Six hours a week at $30 an hour is about $780 a month (6 × $30 × 52 ÷ 12).
• Add costs the seller does not carry. Software they get on a personal plan, a contractor paid from another account, or ad spend they plan to stop after the sale.
• Add one-time costs to the price. Escrow and legal fees, migration, and any paid review you commission. These lengthen payback as surely as a higher price does.

A worked example. A listing asks $40,000 and states $1,600 of monthly net profit, so the headline payback is 25 months. The seller works six hours a week. Replacing that time costs about $780 a month, which leaves $820. With $1,500 of one-time costs, payback becomes $41,500 ÷ $820, or about 51 months. The listing has not changed. The payback has doubled.

Step 3: remember that payback assumes flat profit

The formula assumes every future month earns what the past months did. For subscription businesses that depends on churn. With 7% of customers leaving each month and no new ones, revenue halves in about 10 months (0.93 to the power of 9.6 is about 0.5). A business like that needs steady new sales just to stand still, so a 30-month payback calculated on today's profit is optimistic unless the listing shows how new customers arrive and what they cost.

Two questions cover most of this: what was monthly churn over the last 12 months, and how many new customers came in each month, from which channels.

What payback is reasonable?

There is no single right number. It depends on how stable the profit is, how much of your time the business needs and how easily it can be copied. Two reference points from our own work:

• The benchmark in our checker uses Empire Flippers asking multiples from its public Marketplace API on 6 October 2026. Across all 173 listings for sale, the median was 2.5×, or 30 months. These are asking prices, not sale prices.
• When we screened 41 public SaaS and app listings in October 2026, the median payback on stated profit was 26.7 months, with a range of 9.3 to 50 months.

A payback far below the usual range is not automatically a bargain. It can mean the profit figure is out of date, the business is shrinking or the seller needs to sell quickly. Ask why.

A short checklist

• Divide the price by trailing 12-month net profit ÷ 12, not by revenue, MRR or one good month.
• Find out which months the seller used, and compare last month with the average.
• Subtract the cost of the owner's time and any costs the seller does not carry.
• Add one-time costs to the price.
• For subscriptions, ask for monthly churn and new customers before you trust a flat-profit payback.

FirstPass Memo is independent and is not affiliated with Empire Flippers or Acquire.com. Figures are as published on the dates shown and may change. The worked example is illustrative and is not financial advice.

Sources

1. Empire Flippers, We're Switching to Annual Multiples, 8 September 2026, read 7 October 2026. Back
2. Empire Flippers, Frequently Asked Questions from Sellers, read 7 October 2026. Back
3. Empire Flippers, Website Valuation Guide, section on pricing windows, read 7 October 2026. Back
4. Acquire.com Help Center, How to list your startup, last updated 22 May 2026, read 7 October 2026. Back
5. Acquire.com Help Center, Seller FAQs, "What is my startup worth?", last updated 27 July 2023, read 7 October 2026. Back