Tool

Synergy Underwriting & Value Bridge

Turn synergy claims into risk-adjusted cash value, an explicit seller-sharing decision, and an operating delivery plan.

What this helps you decide

What value can the buyer create, what will it cost, and how much—if any—should be reflected in the purchase price?

The decision this tool answers

Download the Synergy Underwriting & Value Bridge workbook · Excel · Version 1.0 · USD thousands

A synergy is a change the buyer expects to create by combining businesses. It has value only after the cost, time, investment, disruption, and execution risk of making that change are accounted for.

This workbook separates the target’s standalone value from the buyer’s incremental cash benefit. It then makes the amount shared with the seller an explicit decision. A larger affordability case does not automatically justify a larger offer.

When to use it

Use it during first-look underwriting to challenge the claimed upside, before the LOI to establish price discipline, after diligence to revise the case, and after close to track delivery. It supports Gates 4, 7–8, and 11–12 in The M&A Deal Workflow.

The workbook is designed for a 10–15 minute first pass with a few material initiatives. That first pass should expose the decisions and missing evidence that deserve more work.

What to bring

Use USD thousands throughout the workbook and a consistent valuation date. Start with standalone enterprise value, an independently determined affordability limit, a private hard price ceiling, and the proposed enterprise value. Bring an initiative-level estimate of incremental revenue or cost savings, contribution margin on new revenue, cash tax assumptions, timing, probability, dis-synergies, implementation cost, and required capital.

For each initiative, name the operating owner, required integration action, workflow dependency, customer disruption risk, and evidence still needed. Enter an explicit zero when a cost or risk has been assessed as zero. Leaving the input blank means the question remains open.

Your first 15 minutes

Frame the deal. Enter standalone enterprise value, proposed price, affordability limit, and private ceiling in USD thousands. The filled example inputs are labeled Assumption. Replace them before using the result for a transaction.
Enter the few initiatives that matter. Describe the operating change before entering its benefit. Revenue synergy needs a contribution margin. Cost synergy needs an expense that can actually be removed.
Price the delivery work. Enter dis-synergies, one-time implementation spend, capital needs, timing, and accountable owners. Do not reduce committed costs just because the benefit is uncertain.
Review the value bridge. Compare gross benefit, risk-adjusted benefit, net cash value, seller sharing, and the supported offer. Read the missing-input and unresolved-question flags.
Switch to Downside. Test weaker capture, delay, disruption, and cost overruns. Carry any broken condition into Investigate, Price, Protect, or Walk.

From operating change to cash value

Revenue synergy: incremental revenue × contribution margin. Use the margin on the incremental work after its delivery costs, not the target’s headline EBITDA margin by default. Deduct cannibalization and avoid counting revenue that was already in the standalone forecast.

Cost synergy: removable recurring expense after replacement cost and service-level requirements. A budget transfer between entities is not a consolidated saving. Retention costs, vendor exit fees, overlapping systems, and stranded costs can change the answer.

Risk-adjusted benefit: apply the initiative’s probability and the selected capture profile to the revenue contribution and cost savings. Model disruption and other dis-synergies separately. Benefits that rely on the same workflow can fail together; the Downside case is where the combined failure should be tested.

Net cash value: subtract cash tax, dis-synergies, one-time implementation costs, and capital requirements, then discount the resulting incremental cash flows. The version 1.0 workbook uses five end-of-year operating periods, with implementation and capital funded at close and no terminal value. It does not assume that a stated run-rate saving continues forever.

The purchase-price bridge

Keep every amount on an enterprise-value basis. Standalone value excludes buyer-specific improvements. Buyer-created value is the net present value of the incremental synergy cash flows after costs and risks.

Economic value ceiling equals standalone enterprise value plus net synergy value. Negative synergy value reduces the ceiling. Seller sharing is an explicit percentage of positive net buyer-created value; a zero sharing assumption does not make a negative synergy case disappear.

The supported offer is also constrained by the buyer’s independent affordability limit and private hard ceiling. These are inputs requiring their own financing, liquidity, and return analysis. This workbook does not derive debt capacity or prove that the combined business can survive the downside.

Debt, cash, working-capital adjustments, and other closing items must be handled separately in the enterprise-to-equity bridge and sources and uses. Do not compare an equity cheque directly with an enterprise-value ceiling.

Mike’s governing judgment

The buyer may consider synergies when deciding affordability. That does not mean the seller automatically owns them.

The buyer funds the work, owns the execution risk, and normally keeps the value created by that work. Sharing some value can be a conscious negotiating decision. It should never happen simply because someone added a synergy line to the valuation model.

Protect revenue while integrating cost. Before combining a sales team, changing a customer system, retiring a platform, or removing a role, show how the revenue-producing workflow will continue to function. An operating owner and a tested action are more useful than a larger synergy target.

Common mistakes

Adding a revenue target directly to EBITDA without a contribution margin.
Counting growth in both the standalone forecast and the synergy case.
Discounting uncertain benefits while quietly assuming away required costs.
Using a full run rate in Year 1 despite a delayed launch or slow customer migration.
Counting the same headcount, vendor, platform, or customer benefit twice.
Assuming immediate tax relief without testing whether it can be used.
Treating a calculated ceiling as permission to bid that amount.
Claiming delivery from a lower budget before cash expense has actually left the combined business.

What the result establishes

The result shows what the stated assumptions imply, which inputs remain unresolved, how downside changes the case, and how much value remains with the buyer at the proposed price. It makes the calculation inspectable and the operating commitments visible.

It does not establish a market price, certify a synergy, validate a probability, calculate a complete acquisition return, or replace financing and combined-business cash-flow analysis. The five-year horizon omits value and obligations outside that period. Material future commitments must be assessed before relying on a price ceiling.

Carry the output into the next stage

Send each open evidence question to Before You Buy: Follow the Work. Classify the consequence as Investigate, Price, Protect, or Walk. If diligence changes an input, revise the ceiling before the next approval.

At signing, preserve the approved case and give every initiative an operating owner. Use the Delivery tab to record actual benefits and costs against stable initiative IDs. Carry the action into After the Deal: Keep the Business Working, including the decision to Preserve, Protect, Standardize, Combine, or Retire the affected workflow.

Review cash results at 30, 60, and 100 days, then at an appropriate operating cadence. When delivery falls short, change the action or the forecast. Do not rewrite the original thesis to make the variance disappear.

Version

Version 1.0. Updated September 10, 2026. Editable Excel workbook with formulas, scenario assumptions, sensitivity analysis, checks, and a realization tracker. Entries stay in your downloaded copy.