Deal Structure When Selling an Engineering, Architecture or Environmental Firm: Earnouts, Rollover Equity and Staying On
Owners of engineering, architecture and environmental firms tend to judge an offer by its headline number. The deal structure behind that number decides how much of it you receive, when you receive it, and how much depends on what happens after closing. This guide explains each component and what to look for before you sign a letter of intent.
Two offers can carry the same headline figure and lead to very different outcomes. One pays most of it at closing. Another ties a large share to future performance, asks you to reinvest part of it in the buyer, and expects several years of your time to collect the rest. The difference only becomes visible once you understand the structure.
What makes up the deal structure in an AEC or environmental firm sale?
The total consideration in most transactions is assembled from several parts, each with its own level of certainty:
Cash at closing. Paid on the day the transaction closes. This is the only part of the price that is certain.
Earnout. Additional payments that depend on the firm hitting agreed targets after closing.
Rollover equity. A portion of the proceeds you reinvest in the buyer, or in a holding company formed for the acquisition, instead of taking it in cash.
Seller note. A portion the buyer pays you over time, with interest, on terms set out in the agreement.
Escrow or holdback. An amount set aside for a defined period after closing to cover claims under the purchase agreement, then released to you if none arise.
Your employment or consulting agreement sits outside the purchase price, but it is part of the same negotiation and should be weighed alongside it.
Why do buyers use earnouts and rollover equity?
Clients, staff and backlog can all shift once a founder steps back, so buyers look for ways to share that risk with the seller. Earnouts and rollover equity do three things for them:
They bridge a gap in expectations. When you expect growth that the buyer is not yet willing to pay for, an earnout lets you be paid for it if it arrives.
They protect continuity. Tying part of the price to results after closing gives you a direct reason to see client relationships and key staff safely across.
They align the two sides. Rollover equity makes you a co-owner of the combined business, with the same interest in its next sale as the buyer.
Structured well, earnouts and rollover equity can add meaningfully to a seller’s outcome. The terms decide whether they do.
How does an earnout work?
An earnout pays additional consideration if the business reaches agreed targets over a set period after closing. Targets are usually tied to revenue, gross margin or earnings, measured annually or at the end of the period. Because you are being paid on results you no longer control, the drafting matters more than the headline amount. Pay close attention to:
The metric. A revenue target is easier to measure and harder for the buyer to influence than an earnings target, which can be affected by overhead allocations, new hires or integration costs you did not choose.
Definitions. Exactly how the metric is calculated, which accounting conventions apply, and how shared costs, intercompany work and cross-selling between offices are treated.
Operating covenants. Commitments from the buyer not to take steps that undermine the earnout, such as moving key staff, redirecting projects to other offices or changing billing practices during the measurement period.
A sliding scale. Partial payment for partial achievement. An all-or-nothing threshold turns a small miss into a total loss.
Acceleration. Full or partial payment if the buyer sells the business again, or ends your employment without cause, before the period is over.
A dispute process. An agreed way to resolve disagreements over the calculation, including access to the underlying numbers.
How does rollover equity work?
With rollover equity you reinvest part of your proceeds in the acquiring company, most often a private equity–backed platform. When the platform is sold, usually a few years later, you share in that sale. Done well, the second payout can be meaningful, and under the right structure the rolled portion can defer tax until that later exit.
What you hold, though, is not the firm you built. It is a minority position in a larger, leveraged company, with limited say over strategy or timing. Before agreeing to roll, understand:
The class of equity. Whether your shares rank alongside the investor's or behind them, and how proceeds are split at exit after debt and preferred returns are paid.
Your rights. Access to financial reporting, and the right to sell on the same terms as the investor when the platform is sold.
What happens if you leave. Whether the company can buy back your shares if your employment ends, on what terms, and whether leaving early forfeits part of their value.
The exit timeline. When the investor expects to sell, and what happens to your position if that timeline stretches.
Rollover equity is most common with private equity–backed buyers, in both platform investments and add-on acquisitions, but it works differently in each. In a platform investment, the seller typically reinvests alongside the investor in a new holding company and remains a significant co-owner. In an add-on, the seller reinvests in an existing platform, usually as one of several minority holders. Strategic buyers rarely offer rollover at all.
Earnout or rollover equity: how do they compare?
Question owners ask | Earnout | Rollover equity |
What is being rewarded? | Your firm's performance against agreed targets | Growth in the value of the combined company |
When is it paid? | During or at the end of the earnout period | When the combined company is sold, or through a buyback |
Who controls the outcome? | Mostly the buyer, within whatever protections you negotiate | Mostly the investor and the platform's leadership |
Main risk to the seller | Targets missed for reasons outside your control | A delayed exit, or one at a lower value than expected |
Where it shows up | Strategic buyers and private equity–backed platforms | Private equity–backed platforms |
What should I know about staying on after closing?
Most buyers want the owner to stay for a period after closing to ensure continuity of the business and support a smooth transition and integration. The terms belong in an employment or consulting agreement negotiated alongside the purchase agreement, not left for later. Settle these points up front:
Role and reporting line. What you will be responsible for, and to whom you report.
Duration. How long you are committed, and what happens when the period ends.
Compensation. Salary, bonus eligibility and benefits, separate from the purchase price.
Restrictive covenants. The length and geographic reach of non-compete and non-solicitation obligations, which often outlast the employment period itself.
The link to the earnout. Whether earnout payments depend on your continued employment, and what happens to them if your role ends early for any reason.
What other terms decide what I take home?
Several provisions in the purchase agreement move real money without ever appearing in the headline number:
Working capital target. Nearly every deal sets a normal level of working capital the firm must deliver at closing, with the price adjusted up or down against it. For engineering, architecture and environmental firms, the treatment of work in progress, unbilled revenue, receivables and retainage inside that target can swing the final amount significantly, which is where sector experience matters most.
Indemnification and escrow. How much of the price is held back, for how long, what it covers and whether there is a cap on your exposure.
Asset sale or stock sale. The legal form of the transaction changes the tax outcome for both sides. Review it with your tax advisor before the letter of intent, not after.
Debt and transaction expenses. Outstanding debt, deal costs and sometimes accrued bonuses are deducted from proceeds at closing.
How should I compare offers?
The best offer is rarely the one with the largest number on page one. Compare the full deal structure:
How much is guaranteed at closing, and how much is contingent or deferred.
Whether the earnout targets are realistic, and how much influence you will have over meeting them.
What any rollover equity is really worth, what rights come with it, and when you could expect to realize it.
What role you are committing to after closing, and for how long.
How each buyer intends to treat your people, your clients and your firm's name.
The time to settle these points is in the letter of intent, before you grant a buyer exclusivity and your leverage narrows. Our guide to selling a firm explains where the letter of intent fits in the overall process.
Frequently asked questions
Can I avoid an earnout altogether? Sometimes. Earnouts are less common when a firm attracts strong buyer interest, shows consistent financial performance and has leadership that does not depend heavily on the owner. Even when an earnout is part of the deal, its size, metric and terms are all negotiable.
Is rollover equity guaranteed to be worth more later? No. Rollover equity can deliver a meaningful second payout if the combined company grows and is sold, but its value depends on future performance, leverage and market conditions, and you usually cannot sell it until the investor exits.
Do I have to stay with the firm to receive my earnout? It depends on the agreement. Some earnouts require continued employment, while others depend only on the firm's results. The agreement should say clearly what happens if your role ends early, whether by your choice or the buyer's.
What happens to my earnout if the buyer is sold? That depends on the purchase agreement. Many include acceleration provisions that pay the earnout, in full or in part, if the business is sold again during the earnout period. If yours does not, ask for one.
Talk to us about structuring your sale
If you are considering a sale, whether this year or a few years from now, a confidential conversation costs nothing. We can walk you through how deal structure shapes the outcome and what a process would look like for your firm.
Blackcastle Partners is an M&A advisory firm that represents owners of engineering, architecture and environmental consulting firms with $2 million to $100 million in revenue across North America.
Contact Blackcastle to schedule a confidential consultation.
Blackcastle M&A Advisory for AEC and Environmental Firms
(949)614-5564 info@blackcastlepartners.com
