EBITDA Addbacks in Interviews: What Counts, What Doesn't, and How to Push Back

"Adjusted EBITDA" is where PE interviews get sharp. Anyone can recite the EBITDA definition. Fewer people can separate a fair addback from seller fiction. Interviewers want to know whether you protect the entry multiple or just accept management's bridge.

The short answer

EBITDA starts from operating earnings before interest, taxes, depreciation, and amortization. Addbacks adjust for items that are non-recurring, non-cash, or not part of the run-rate cost structure the buyer will inherit. Good addbacks make earnings more comparable to what the sponsor will own. Bad addbacks inflate the denominator so a high purchase price looks cheaper on a multiple.

Adjusted EBITDA = EBITDA

Non-recurring / one-time costs (if truly one-time)
Non-cash items sometimes (stock-based comp: debate)
± Run-rate adjustments (synergies, cost outs) with heavy skepticism

Common addback categories

Worked mini-example

Management bridge:

Reported EBITDA                 40
Add: one-time litigation        5
Add: owner excess comp          3
Add: "growth investments"       4
Add: expected cost synergies    6
───────────────────────────────
Management Adj. EBITDA         58

Buyer view in an interview:

• Keep litigation 5 if truly settled and non-recurring
• Keep owner excess 3 after stating replacement cost for a CEO / GM
• Challenge growth investments 4: may be opex that sustains revenue
• Move synergies 6 out of Trailing Adj. EBITDA into Year 2-3 of the operating case

Interview Adj. EBITDA might land near 48, not 58. At 10x, that is a $100 swing in EV before you touch the multiple.

How to answer verbally

"I start with reported EBITDA, then only add items that are clearly non-recurring or that normalize owner economics to a replacement cost. I keep run-rate cost outs and synergies in the forward model with timing, not in Trailing Adjusted EBITDA used for the entry multiple, unless diligence has already proven them."

Then stop. Offer to walk an example if they want.

Mechanics that keep you honest

Ask for the addback schedule line by line, not the total. Tie each item to a cash or P&L evidence pack: invoice, board memo, severance agreement, or QoE footnote. If management cannot show the support in diligence, the addback is a negotiation chip, not a fact. Haircut aggressive items in a sensitivity so IC sees EV at reported, management-adjusted, and diligence-adjusted EBITDA on the same multiple.

Quality of earnings angle

QoE reports pressure-test revenue recognition, expense classification, and addbacks. In interviews you do not need to be an accountant. You need a skepticism checklist:

1. Is the item cash or non-cash?
2. Will the buyer still pay it?
3. Is the "savings" already reflected elsewhere?
4. Does the addback change unit economics or just cosmetics?
5. What happens to the multiple if we haircut addbacks 50%?
6. Is the addback already capitalized elsewhere (CapEx vs opex reclass)?

IB vs PE framing

Follow-up questions to practice

1. Should SBC be added back? (Depends on firm; argue both sides: dilution vs cash.)
2. How do addbacks interact with LTM vs NTM entry multiples?
3. What if addbacks are larger than reported EBITDA?
4. How would you diligence "one-time" marketing spend that appears every year?

Drill (15 minutes)

Take any company press release that cites Adjusted EBITDA. List each addback. Mark keep / cut / move to forward case. Recalculate a rough Adj. EBITDA and the implied EV at a stated multiple. Say your diligence Adj. number out loud in one sentence.

Keep going

Pair this with Quality of Earnings in PE and LTM vs NTM EBITDA so entry multiple and earnings base stay consistent in your answers. For the entry bridge itself, keep cash-free debt-free and sources and uses in the same mental model: inflated Adj. EBITDA is how a seller hides price.