How Much Money Do You Need to Buy a Small Business?

A lender approves the loan off the business's last three years. You live with the loan off what the business throws off after you take over and pay someone to do the work the seller used to do. Those are two different tests, and only one of them is yours.

So "how much money do you need to buy a business" really comes down to one calculation. Does the cash flow cover the debt after the owner's replaced, with a reserve left over?

You can afford it when the cash flow, after you replace the owner's role, covers your annual loan payment by at least 1.25x and still leaves a living-expense reserve. The asking price matters less than the cash that survives owner replacement and debt service.

Stated profit and spendable cash can sit a long way apart. The space between reported profit and actual cash flow is where most affordability mistakes hide.

Running it on a real-looking deal

Take a commercial cleaning company you're looking at in the fall. It shows $300,000 in seller's discretionary earnings, it's priced at $900,000, and you'd finance it with an SBA 7(a) loan. Here's the math, in order.

1. Down payment: about $90,000. SBA 7(a) acquisition loans typically require 10% equity, so on a $900,000 price that's roughly $90,000 of your own cash. Check the exact equity rule against the current SBA 7(a) loan requirements before you budget it.

2. Closing costs, on top. Lender fees, legal work, and the SBA guarantee fee land on you at close. Budget for the closing costs that sit on top of the down payment so the down payment isn't your last dollar.

3. Annual debt service: about $125,774. Financing $810,000 over the SBA-standard 120-month term at the FY2025 median 7(a) rate of 9.50% comes to roughly $10,481 a month, or about $125,774 a year. A different rate changes it, so run your own (9.50% is the median, used here as the example).

4. Replace the owner before you count the cash. That $300,000 SDE includes the seller's labor. If you have to pay a manager $90,000 to do that work, the cash available for the loan is $210,000, not $300,000.

5. Debt service coverage: 1.67x. Divide the $210,000 by the $125,774. That's a coverage ratio of 1.67, above the 1.25x lenders want and above the floor you should want for yourself.

6. The reserve: whatever's left. After debt service about $84,000 remains. That has to cover your salary, a working-capital buffer, and the slow months, so a reserve of six months of operating expenses sits under all of it.

That deal works. There's a coverage cushion and cash left to live on. Change the price, the rate, or the manager's salary and coverage is the first thing that moves.

Is the $300,000 even real

All of that assumes the SDE holds up. A seller's number is where verification starts.

Before you trust it, learn to read a small business P&L and find the add-backs that pump it up. An add-back that doesn't survive diligence is coverage you thought you had and never did.

The most common mistake by far is counting the owner's pay as buyer cash. The seller worked 50 hours a week. If a manager does that now, the manager's salary comes out before the loan payment, every single month.

Approval versus survival

Financing is risk structure. The down payment, the term, the rate, and the coverage ratio decide how much of a hit the deal can take before it stops paying you.

There are two halves to affordabilty and most buyers only count the first. One is cash to close: down payment plus closing costs plus the reserve. The other is whether the coverage holds up when year one comes in short.

So run it again with a 20% revenue drop in year one. If coverage falls under 1.25x with that stress on it, you can't afford the deal at this price, no matter what the lender approved.

FAQ

How much money do you need to buy a small business?

You need the down payment plus closing costs plus a living-expense reserve, not just the down payment. On a $900,000 SBA-financed deal that is roughly $90,000 of equity, several thousand in closing costs, and a six-month operating reserve that keeps you solvent when year one runs slow.

What debt service coverage ratio do you need to buy a business?

Lenders generally want a debt service coverage ratio of at least 1.25x, meaning the cash flow covers the loan payment 1.25 times over. Calculate it on cash after you replace the owner's role, not the seller's full SDE, because a ratio computed before owner replacement overstates what the business can actually carry.

Does an SBA loan mean I can afford the business?

An SBA approval means the loan clears the lender's underwriting, not that the business is safe for you to own. Affordability is debt service measured against cash flow after owner replacement, with a reserve, so a deal can be approvable and still be too tight to survive a 20% revenue drop in year one.

The calculation above is only as good as the cash flow you put into it, and most buyers never verify the seller's number before they make an offer.

That's the job the Keystone diagnostic is being built for, and Keystone is closed until the build is done. When it opens, 18 questions and about four minutes will get you three scores and a value range with the most likely figure locked, drawn from 10 years of BizBuySell Insight Reports and 1.6M+ SBA 7(a) loan records, so you know what the business is worth before you anchor to an asking price.

Join the waitlist at https://app.trykeystone.io.

When you are running the numbers on real deals, Keystone Command ($199/mo, $1,990/yr) includes the Deal Analyzer, which runs the down payment, debt service, and coverage math on each target so you compare deals on the cash they leave you.