We are structuring our exit with an installment note under Section 453, but the buyer is also insisting on a performance-based earnout that makes the final purchase price variable. How does the IRS calculate our tax basis recovery in a contingent payment installment sale, and how do we structure the terms to avoid paying tax on money we might never receive?

Question

Tyler Smith · Accepted Answer

When you combine an installment sale with a variable earnout, the transaction is classified by the IRS as a contingent payment installment sale. Under Section 453, the tax rules default to treating these deals with a rigid formula that can severely penalize you if the earnout is not fully realized.

If the deal has a stated maximum selling price, the IRS assumes you will receive that maximum amount. They allocate your tax basis over the maximum price. If you fail to hit your performance targets and the earnout pays out less, you end up front-loading your tax payments based on phantom gains.

To protect your cash flow and avoid paying taxes on money you do not receive, you must negotiate specific structural guardrails in your purchase agreement.

First, if there is no stated maximum price but there is a fixed payment period, the IRS requires you to recover your basis in equal annual increments over that period. This can also defer your basis recovery unnecessarily.

Second, work with your CPA to structure the contract with a stated maximum selling price that is realistic, or utilize the alternative basis recovery rules. You can petition the IRS for an alternative method if you can prove the standard formula grossly distorts your income.

Keep your leadership team focused on executing their quarterly Rocks to ensure you hit the operational targets required for the earnout. Use your weekly Level 10 Meeting™ to monitor the integration metrics. If the buyer controls the operations post-close, make sure the contract states that any failure by the buyer to support the business accelerates the installment note payments and locks in your basis recovery.