Pro-Forma EBITDA Adjustments Explained
What are pro-forma EBITDA adjustments in Transaction Services, when are they valid, and how should you evaluate them in a Financial Due Diligence?
Pro-forma adjustments are the most complex and most contested category in the EBITDA bridge. They require the most judgement — and generate the most discussion between buyers, sellers and FDD teams.
What makes an adjustment "pro-forma"?
A pro-forma adjustment captures the full-year effect of a structural change that has already happened but isn't yet fully visible in the historical accounts. Unlike run-rate adjustments (which annualise known cost changes), pro-formas typically involve acquired businesses, new operations or significant revenue events.
The key characteristic: a pro-forma is forward-looking in spirit, even if it's rooted in a specific, verifiable event.
Common pro-forma scenarios
Acquisition made during the period
If the company acquired a subsidiary on 1 September, only four months of its contribution appear in the full-year accounts. A pro-forma adjustment adds the missing eight months to arrive at a "full-year as if owned" EBITDA.
Validation requirement: carve-out management accounts for the acquired entity, covering the full 12-month period, with consistent accounting policies.
New site or facility opened during the period
A manufacturing plant that came online in May will contribute only 7 months to the annual EBITDA. The pro-forma adjustment annualises this to a 12-month run-rate contribution.
Validation requirement: monthly revenue and margin data from the new site; confirmation that operations have reached a steady state.
Contract signed but not yet fully contributing
A major contract signed in October delivers only 3 months of revenue in the year. The pro-forma adds the incremental 9 months.
Validation requirement: signed contract, confirmation of delivery schedule, evidence of full contract performance capability.
Management-restructured cost base
If a management layer was removed mid-year, the full-year savings from the restructuring haven't yet flowed through. A pro-forma adjustment captures the full annualised benefit.
Validation requirement: HR records, payroll data, evidence that the cost reduction is permanent.
Why pro-formas are the most scrutinised
Unlike one-offs — which simply remove known historical costs — pro-formas project a future reality based on assumptions. Buyers and their FDD advisers will push back hard if:
- The underlying event is not yet complete or certain.
- The assumptions behind the annualisation are optimistic.
- Multiple pro-formas are stacked to produce an EBITDA that looks very different from any historical year.
- There's no independent data to validate the contribution (e.g. carve-out accounts, detailed site P&L).
How to handle pro-formas in an interview
If asked "how do you evaluate a pro-forma adjustment?", structure your answer:
- Verify the underlying event is real and documented.
- Obtain independent financial data to quantify the contribution.
- Assess whether the contribution is at a steady-state run-rate or still ramping.
- Evaluate the risk — if the event is recent or the contribution uncertain, apply a discount or present it as a range.
- Present the pro-forma separately from the more defensible one-offs and run-rate adjustments.
Pro-formas should always be presented transparently, with clear assumptions. A buyer who purchases a business based on an aggressive pro-forma and then doesn't achieve it has a legitimate grievance.
The programme's case studies include scenarios with contested pro-forma adjustments — giving you the practice needed to evaluate them confidently.