Earn-Out Modelling: Pricing the Risk You Keep
How to model earn-outs so founders see what a deal is really worth: structures, hurdles, scenarios and the traps that turn headline price into hope.
An earn-out is not a bonus for optimism. It is deferred purchase price that only becomes cash if the business hits agreed targets after completion, often while you no longer fully control the levers. Founders who accept earn-outs on a headline multiple without modelling the paths are not selling a business; they are writing a call option on their own future stress. This guide is a virtual CFO view of how to model earn-outs so you can price the risk you keep.
Published: July 2026
In a sale, part of the consideration is paid at completion and part is contingent on post-completion performance: revenue, EBITDA, gross profit, ARR, or milestone events. The contingent piece is the earn-out. Buyers use it to bridge valuation gaps, keep founders aligned, and shift risk of forecast miss from buyer to seller. Sellers accept it when they believe the plan is achievable and when the cash at completion alone will not clear their number.
Earn-outs show up differently by buyer type. Private equity versus strategic appetite varies, but the modelling discipline is the same: convert legal terms into cash scenarios before you agree.
Pay X if revenue or EBITDA exceeds a threshold in year 1, 2 or 3. Simple to describe, easy to game or dispute on accounting definitions. If EBITDA is the metric, normalisation definitions in the sale agreement matter as much as the number.
Pay a percentage of consideration as performance moves between a floor and a cap. Better aligned than a single cliff, but still depends on metric definitions and who controls costs.
Targets measured across two or three years in aggregate. Reduces single-year timing games; increases the period you remain exposed to integration decisions you may not control.
Product launch, licence win, contract renewal, regulatory approval. Binary outcomes need probability-weighted scenarios, not a single “base case.”
Common in PE: you roll a percentage of proceeds into the buyer’s structure and only crystallise value on a later exit. Not always labelled an earn-out, but the economics are contingent on future performance and exit multiple.
A useful earn-out model is not a 40-tab masterpiece. It is a clear bridge from completion cash to total cash under scenarios.
Step 1, Lock the legal metrics into formulas.
Copy the definition of revenue, EBITDA, ARR or working capital from the draft SPA into the model notes. If “EBITDA” excludes the buyer’s allocated head-office charge in the term sheet conversation but not in the draft, the model must flag the gap.
Step 2, Build three operating paths on the same chart of accounts.
Base, downside and upside for the earn-out period only. Drivers should match how the business actually makes money: volume, price, churn, utilisation, project wins. Do not model earn-out years as a flat growth rate if the rest of your board pack is driver-based.
Step 3, Layer buyer-controlled adjustments.
Integration cost allocations, lost cross-sell assumptions, change of product pricing, key-person departure. The point is not to be cynical; it is to price control risk. If the buyer can load costs into your EBITDA, a pure EBITDA earn-out is partially their option, not yours.
Step 4, Convert operating outcomes into earn-out cash.
Apply floors, caps, linear slopes, catch-up provisions and offsets for claims or working-capital true-ups. Show timing of payment (6 months after year-end audit is not “year 1 cash”).
Step 5, Discount or at least time-weight.
Even without a formal DCF obsession, $1 in 30 months is not $1 at completion. Present both nominal and simple time-weighted views so headline price does not hypnotise you.
Step 6, Output a one-page decision table.
Completion cash | earn-out year 1 | year 2 | year 3 | total nominal | probability-weighted total | notes on control risk. That page is what you take into negotiation, not a feeling that “we will smash it.”
Headline deal: $18M enterprise value on a normalised EBITDA of $3.0M (6.0x). Structure: $12M cash at completion, $6M earn-out over two years, 50% if EBITDA hits $3.3M in year 1, 50% if cumulative two-year EBITDA hits $7.0M, linear between 80% and 100% of target, capped at $6M.
Scenarios:
Scenario: Upside Y1 EBITDA: $3.6M Y2 EBITDA: $3.9M Earn-out paid (nominal): $6.0M Total cash to seller: $18.0M.
Scenario: Base Y1 EBITDA: $3.3M Y2 EBITDA: $3.5M Earn-out paid (nominal): ~$5.1M Total cash to seller: ~$17.1M.
Scenario: Downside (integration drag) Y1 EBITDA: $2.8M Y2 EBITDA: $3.0M Earn-out paid (nominal): ~$2.4M Total cash to seller: ~$14.4M.
Scenario: Control-risk case (cost allocation) Y1 EBITDA: $2.6M Y2 EBITDA: $2.7M Earn-out paid (nominal): ~$1.5M Total cash to seller: ~$13.5M.
The headline is $18M. The control-risk case is closer to $13.5M. That $4.5M gap is the price of definitions and control, not of “missing the plan because we were lazy.” A founder who only models the upside signs a different deal than the one on the term sheet slide.
This is commercial modelling, not legal advice. Your lawyer drafts; the model prices. Both are required.
Earn-outs sit on top of a defensible earnings base. If your add-backs are soft, the earn-out baseline is soft. If your data room is chaos, diligence will push more value into contingent consideration. If you have not compared PE vs strategic structures, you may accept an earn-out shape that fits one buyer and harms you with the other.
A 90-Day Number engagement can produce the exit model, including earn-out scenarios, as the named deliverable when a sale process is on a near horizon.
Is an earn-out a bad deal?
Not inherently. It is a tool to bridge price when buyer and seller disagree on forecast. It becomes a bad deal when the contingent piece is large, the metrics are controllable by the buyer, and the seller has not modelled downside and control-risk cases.
What percentage of price is “normal” as earn-out?
It varies widely by sector and use in negotiation. Treat any rule of thumb as weak. Model your specific structure. A small earn-out on clean metrics can be fine; a large earn-out on vague EBITDA can dominate your outcome.
Should I prefer revenue or EBITDA metrics?
Depends on who controls costs and pricing after completion. Revenue is harder for a buyer to bury with allocations but can incentivise low-quality growth. EBITDA aligns to profit but needs airtight definitions. Sometimes a gross-profit or contribution metric is the cleaner middle.
How many scenarios do I need?
At least base, downside and a control-risk case that changes integration assumptions. Upside is optional for ego; downside is mandatory for decision quality.
Can a virtual CFO negotiate the earn-out for me?
The commercial analysis and scenario pricing are virtual CFO work. Legal drafting and final negotiation seats involve your lawyer and, often, your M&A adviser. Best outcomes happen when the model and the mark-ups move together.
When should modelling start?
Before you respond to a term sheet that includes contingent consideration, and ideally while indications of interest are still flexible. Modelling after you have emotionally accepted the headline price is how people rationalise bad structures.
Sydney Virtual CFO is a Sydney-based virtual CFO service for founders running $2M to $15M businesses across SaaS, ecommerce, professional services, construction, and other low-volume, high-value industries. We deliver fixed-scope CFO engagements with a named deliverable on day 90: a 13-week cashflow forecast, a fundraise-ready financial model, a unit economics build, or a board reporting pack you can run on your own.
Our front-door product, the 90-Day Number, is fixed scope at $17,850 plus GST. We are one of the few project-based virtual CFOs in Australia, in a market built almost entirely on monthly retainers. No retainers without a deliverable. No 80-page reports. No theatre.
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This content is general information only, written for Australian founders running businesses in the $2M to $15M revenue range. It does not constitute tax, financial product, investment, or legal advice and should not be relied on as such. The work referenced is led by a Chartered Accountant (CA ANZ), but Sydney Virtual CFO is not a licensed tax agent, not a licensed financial adviser, and not authorised to provide personal financial advice. Tax obligations, accounting treatments, fundraise terms, and statutory requirements depend on your individual circumstances. For advice specific to your business, contact the team directly or consult a registered tax agent, licensed financial adviser, or qualified lawyer. Information was current at the time of publication and may change without notice. We review and update guides periodically.
