The Add-Back Audit: Which 'One-Time' Costs Are Really Recurring

Adjusted EBITDA is the number the whole deal is priced on, and it is the number most open to interpretation. The gap between reported earnings and adjusted earnings is a list of add-backs: costs the seller argues are not really part of the business. Some are legitimate. Some are wishful. The add-back audit is where you find out which.

Why add-backs decide the price

Buyers pay a multiple of adjusted EBITDA. So every dollar of add-back the seller can justify is a dollar times the multiple added to the price. On a 5x deal, a $200k add-back is a million dollars of value. That asymmetry is exactly why add-backs get generous, and why they deserve a line-by-line audit rather than a glance at the summary.

The three questions for every add-back

For each adjustment, ask three things. Is it real: did the cost actually exist, and is it in the financials you can see? Is it one-time: or does something like it recur every year under a different label? Is it the buyer's to keep: an owner's above-market salary normalises down, but "one-time" consulting fees that appear three years running are recurring costs wearing a costume.

Where the soft add-backs hide

Add-back	The claim	The check
Owner compensation	Above-market salary normalises to a hire	The real cost of a replacement manager
"One-time" professional fees	Non-recurring legal or consulting	Whether similar fees appear in prior years
Personal expenses	Run through the business, add them back	Documentation, not assertion
Discontinued lines	Losses that will not repeat	Whether the revenue also disappears
Owner relationships	Free rent, family below-market wages	The cost once the owner is gone

The discipline is the same as the rest of diligence: take the figure from the source, trace it to a document, and treat any add-back that cannot be evidenced as a question, not a fact.

A worked example

A seller adds back $180k of "one-time" consulting. The adjustment lifts adjusted EBITDA and, at a 5x multiple, adds $900k to the ask. The audit finds similar consulting spend in each of the prior three years, under slightly different vendor names. It is not one-time. It is a recurring cost, and removing it from the add-backs takes almost a million dollars off a defensible price.

How Deal OS surfaces it

Deal OS reads the financials and the notes and surfaces each add-back with its source line, so you can test recurrence against prior periods instead of taking the adjusted number on trust. Where an add-back in the narrative is not supported in the underlying detail, it flags the gap with both sides cited. See it on a synthetic deal in the sample brief, or run a real CIM through it for a one-time $99 with the CIM Pass, credited to your first month if you continue.

Frequently asked questions

What is an add-back in a quality of earnings analysis? It is an adjustment that removes a cost from reported earnings to show what the business would earn under new ownership, producing adjusted EBITDA.

Which add-backs are legitimate? Genuinely non-recurring costs and true owner-specific expenses, like an above-market salary or personal costs, are usually fair. Costs that recur under different labels are not.

How do buyers test add-backs? By tracing each one to source documentation and checking prior years for recurrence. Anything unevidenced is treated as a diligence request.

See what a cited, contradiction-flagging brief looks like on a sample deal at Deal OS.