The synergy pro-forma — modeling the combined entity.

Every synergy lever in the framework — tier-jumping, arbitrage, the commission-rate phenomena, the hidden-value levers — exists to feed one document: the combined-entity pro-forma that anchors the purchase-price conversation. The pro-forma's job isn't to maximize the number; it's to produce a number that survives diligence, because an inflated pro-forma gets challenged line by line and an honest one gets accepted. The discipline that makes it survive is structural — three columns, certainty tiers, and sanity bands.

§ 01 · Three columnsThe structure that defends itself.

The three-column structure is what makes a pro-forma defensible. The target standalone column is the current run-rate, normalized — remove the seller's above-market compensation (replace with a market rate for the functional role), eliminate personal expenses run through the business, adjust one-time legal and professional fees, and smooth non-recurring revenue events. The adjustments column holds the synergies and risk offsets, kept separate from each other. And the combined pro-forma is the sum — the basis for the price conversation. The cardinal discipline is to keep the columns visually and analytically separate: a pro-forma that collapses everything into a single net figure is harder to defend and easier to dispute, while one where every dollar of delta is traceable to a specific line item with supporting logic survives scrutiny. The standalone normalization is the same rebuild covered in pro-forma modeling.

§ 02 · Three certainty tiersLabeling every adjustment.

The certainty-labeling rule is the single most important discipline in the document, because it's what lets a buyer defend each number on its own terms. An almost-certain adjustment — a tier-jump that's mechanical once the codes merge, a duplicate cost that simply disappears, a wholesale-to-direct conversion already validated — flows at full value because it's genuinely close to certain. A probable adjustment — one that depends on reasonable post-close execution with an established playbook but a variable timeline — gets discounted to 60%–80% of face, acknowledging the execution risk. And a speculative adjustment — one that depends on an undemonstrated capability or uncertain condition — gets conservative values or gets excluded from the base case entirely. The reason this matters is adversarial: a pro-forma that presents every adjustment as equally certain invites aggressive challenge, while one that has already discounted the uncertain pieces has nothing left to attack. The lever certainties trace back to pieces like market-access arbitrage (almost certain) versus L&H cross-sell (execution-dependent).

§ 03 · Six concept-to-line mappingsWhere each lever lands.

The framework's concepts map to specific pro-forma lines, and getting the mapping right is half the rigor. Six recur. The loss-ratio trap maps to a risk offset (contingency at risk, or the keep-separate decision). Tier-jumping maps to a revenue synergy, modeled by carrier rather than aggregated. Market-access arbitrage maps to a revenue synergy (the commission-rate uplift per converted line). L&H cross-sell maps to a revenue synergy, explicitly labeled execution-dependent. Client attrition maps to a risk offset, scaled by transition quality (a strong, standard, or minimal transition implies a 5%, 10%, or 15% reduction). And account stratification maps to a cost synergy or margin improvement, conservatively over 12–18 months. Mapping each lever to the right line — revenue synergy, cost synergy, or risk offset — and keeping the risk offsets in the model is what separates a credible pro-forma from an optimistic one, because a pro-forma that omits the risk offsets typically overstates combined EBITDA by a meaningful margin.

§ 04 · The sanity bandsWhat "too good" looks like.

The final discipline is a set of sanity bands that flag an over-aggressive model. Cost synergies cap at 10%–15% of the combined expense base — "cost synergy as the primary thesis" doesn't translate at agency scale. Realistic revenue synergy is a 5%–15% combined top-line lift in year one; above a 30% combined revenue jump signals over-aggressive modeling. Combined EBITDA-margin improvement of 100–300 basis points over the target standalone is the credible range — beyond it warrants scrutiny. And transition attrition belongs in the model as a 3%–8% combined revenue reduction. There's also a year-3 sustainability test: the combined economics should show stable or modestly growing performance across the first three years, because synergies that materialize in year one but taper by year three mean the pro-forma is inflating current value with non-recurring effects. Built this way — three columns, certainty labels, correct line mappings, and sanity-checked totals — the pro-forma is a document a buyer can defend at the table and a seller can present to anchor the conversation, which is why a well-built one earns a 10%–20% valuation uplift. How the levers feeding it rank by reliability is in revenue vs. cost synergies.

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