The 11 mistakes when selling a business that cost owners money or kill the deal

Most owners sell one business in their life. The buyer across the table may have bought five. This guide is for the owner who has never sold and wants to keep the price they were offered. It lists the mistakes we see most often after ten years of advising buyers and sellers, what each one costs, and what to do instead. For the steps in order, start with our guide on how to sell a business.

1. Pricing on hope instead of a sourced multiple

Owners price on what they need, not on what the business earns. Buyers and their lenders do not care what you need.

A business sells for a multiple of its earnings, and the multiple comes from real sales of similar businesses. A price above that band scares off the good buyers, who know the band. Or it draws a buyer who agrees to the number and then cuts it in diligence, when you have already told your spouse.

Fix: value the business on seller's discretionary earnings or EBITDA, using a multiple from sold deals in your size and sector. Then run the lender's test: after loan payments, can the business still pay the buyer a salary? If not, no bank-financed buyer can pay your price.

2. Messy books and add-backs you cannot prove

Buyers pay for what they can prove, and nothing else. Three things cost sellers money here:

1. Tax returns that do not match the P&L. The buyer's lender values the business on the tax return. If it shows less than your P&L, that is the business they will finance.
2. Cash that never hit the books. Unrecorded cash is worth nothing in a sale.
3. Add-backs with no paper. "Owner's travel, $40,000" with no receipts is a cost, not an add-back. Every dollar a buyer rejects comes off the price at the multiple. At three times earnings, a rejected $40,000 add-back costs $120,000.

Fix: a year before you list, have a bookkeeper tie the P&L to the bank statements and the tax returns, month by month. List every add-back with a receipt and a one-line reason. For a larger business, order your own quality of earnings report before the buyer orders theirs. We wrote a separate piece on what counts as an add-back.

3. Being the business

If you are the top salesperson, the only licensed technician and the one every customer calls, the buyer is not buying a business. They are buying your job, and they know you are leaving.

This shows up as a lower multiple, a longer transition, and an earn-out tied to the customers staying. Sometimes it means no offer at all, because a lender will not finance it.

Fix: start 12 to 24 months out. Promote or hire a manager. Put a second name on the key customer accounts. A buyer should be able to picture the business running on a Tuesday while you are on holiday. That picture is a large part of what buyers pay a premium for.

4. Telling staff and customers too early

Owners feel they owe their team the truth, and told at the wrong moment it costs them the deal. Staff start looking for jobs. A big customer puts the contract out to tender "just in case". Every one of these shows up in diligence as a reason to pay less.

Fix: keep it to the people who must know: your CPA, attorney, advisor and spouse. Buyers sign an NDA before they see anything with your name on it. The listing is blind. Key staff meet the buyer after the letter of intent, ideally with a stay bonus agreed first. Customers hear after closing.

5. Letting the business slide during the sale

Selling a business is a second full-time job for six to twelve months. Owners get pulled into data requests and buyer calls, and the business loses attention.

The buyer sees the dip in the monthly numbers during diligence, and the price drops. This is a re-trade. It is the most common way a seller loses money between the letter of intent and closing.

Fix: run the business as if you were keeping it. Hit the plan you showed the buyer. Hand the data room to your bookkeeper and advisor, and give the buyer one point of contact. A complete data room shortens diligence and gives the numbers less time to move.

6. Taking the first offer without a process

The first buyer who turns up is often a competitor or a customer who heard a rumour. It is usually the lowest price you will see, because nobody else is at the table and the buyer knows it. One offer also means no fallback: when that buyer re-trades, your choice is to accept or start over.

Fix: run a process, even a small one. Take the business to several qualified buyers in the same window. Ask each for a buyer profile, proof of funds or a lender letter, and a reason they want your business. Compare the offers on structure, not just price.

7. Negotiating the headline price and ignoring the structure

Two offers at $2,000,000 can be $600,000 apart in what you actually receive. The money is in the structure:

• Cash at close. The only part that is certain.
• Seller note. You lend the buyer part of the price and are paid over years. Normal in small deals, but you are now the buyer's lender. See our guide to the seller note.
• Earn-out. Part of the price is paid only if the business hits targets after you leave. Our earn-out calculator shows what one is really worth; the explainer is here.
• Working capital peg. The buyer expects a normal level of receivables, inventory and payables on closing day. Strip cash and let payables build, and the price is adjusted down after closing. The rules are in our post on the working capital peg.
• Net of debt. Most offers assume you pay off loans and leases from the proceeds. A $2,000,000 price with $400,000 of debt is $1,600,000 to you before tax.

Fix: write each offer out as cash at close, deferred money, money at risk, and money owed. Negotiate the earn-out targets and the peg as hard as the price.

8. Contracts and leases that cannot move

A business is worth its contracts, and a contract that cannot be assigned to the buyer is worth less than it looks. The common problems are a lease with no right to assign, customer contracts that end on a change of control, a franchise agreement that needs consent, and licences held in your personal name.

These surface late, in legal diligence. Then the landlord or the big customer uses the moment to renegotiate, and the deal stalls.

Fix: six months before you list, read every contract for the words "assign", "change of control" and "consent". Renew the lease on terms a buyer can take over, with options to extend. Where consent is needed, plan when to ask: too early breaks confidentiality, too late breaks the timeline.

9. Not planning the taxes

What you keep after tax is the only number that matters, and most owners think about it after the letter of intent, when the structure is set.

Most small-business sales in the United States are asset sales: the buyer buys the equipment, customer list, name and goodwill from your company, not its shares. The IRS treats this as the sale of each asset separately, each taxed on its own terms; the IRS page on the sale of a business lists the asset classes. The IRS has both buyer and seller report the split of the price on Form 8594, and the two must agree.

A stock sale, where the buyer takes your shares, is usually simpler for the seller. Buyers often prefer asset sales because they get a fresh tax basis and leave old liabilities behind. So the form of the sale is negotiated, and so is the split of the price across the asset classes. We explain both in our post on what an asset sale is.

Fix: bring in a CPA who has done business sales before you take an offer. Ask for an after-tax estimate for an asset sale and a stock sale at your likely price, then negotiate with that number in hand. This is not tax advice.

10. The wrong advisor, and running out of steam

Two mistakes end more deals than any other.

No advisor, or the wrong one. Selling alone saves a fee and costs a process: no one to keep the listing blind, screen the tyre-kickers, run several buyers at once, or hold the price in diligence. The wrong advisor is nearly as costly. A broker who sells restaurants will not know who buys HVAC companies, and one paid only at closing will push you to take the deal in front of you. Ask for their last five sales, with asking and sold prices. Acquisitions.com runs a sell-side advisory practice; the first call is free.

Diligence fatigue. Diligence feels like an audit by someone who does not trust you, because it is. By week six, owners get tired and give things away to make it stop: a bigger seller note, a lower peg, a longer transition.

Agree a timeline in the letter of intent, with a date by which diligence ends and the purchase agreement is signed. Keep the data room complete so there is nothing to wait for. And decide, before you sign the LOI, what you will not give away.

Here are all eleven in one place.