Most business owners measure the cost of preparing for a sale against the cost of their own time and the fees they will pay to advisors. That is the wrong comparison. The cost of preparing for a sale should be measured against the cost of going to market without preparing, and that cost is almost always larger than founders expect.
The mechanism is retrade. A retrade is when a buyer agrees to a price in a letter of intent, then reduces the offer during diligence because something showed up that they did not know about at signing. It could be a customer concentration risk that was not disclosed cleanly. It could be add-backs that the buyer's quality of earnings team will not accept. It could be an operational dependency on the founder that no one wanted to talk about at the start of the process. The result is the same in every case. The price drops, the structure hardens, or both.
In the lower middle market, retrade frequency varies by buyer type but sits in a band that is uncomfortable for sellers who did not plan for it. Private equity add-on buyers are often the most aggressive on retrade because they have a playbook and a cost of capital to protect. Search fund buyers can be less flexible because their financing is constrained by SBA underwriting that uses tax return figures. Strategic buyers negotiate less on price and more on deal structure, but the effect on net at close is similar.
The difference between headline price and net at close is where most founders lose money they did not know they had. A five million dollar headline price with a thirty percent earnout, a ten percent escrow held for eighteen months, and a seller note for another ten percent can leave the seller with two and a half million at close and the rest subject to uncertainty. That is not the deal the founder announced to their family. That is the deal retrade produced.
Preparation costs are knowable and finite. A sell-side quality of earnings report has a price. Customer concentration remediation has a timeline and an operational cost. Building out the management team has a compensation cost. These are line items. Retrade is not a line item. It is a percentage reduction applied to everything the founder has worked toward, and it compounds with every issue diligence surfaces.
The founders who avoid retrade are not the ones who pretend their business is perfect. They are the ones who found the issues before the buyer did, priced them into the deal honestly, and walked into diligence with no surprises left to find. The cost of doing that work is small. The cost of skipping it is very large and usually invisible until it is too late to do anything about.