How to Buy Out a Business Partner: Valuation, Structure, and Financing

Partner buyouts are among the most emotionally complicated transactions in small business, and the emotion is precisely why the process needs to be mechanical. The people negotiating usually have years of history, an unequal sense of who contributed what, and no neutral party in the room.

The way through is to separate the question of what the business is worth — which is an evidence question with an answerable range — from the question of what the exiting partner should accept, which is a negotiation. Conflating them is how these deals turn into litigation.

Before anything else, find your buy-sell agreement. Many partnerships have one buried in the original operating agreement and forgotten. If it exists, it may specify the valuation method, who performs it, the payment timeline, and sometimes a formula that produces the price outright.

With that established, value the whole business first. The three standard approaches — earnings multiple, revenue multiple, and discounted cash flow — are covered in detail in our guide to valuing a business. For a partner buyout, the earnings-multiple approach usually carries the most weight, because it is what a lender will underwrite against.

Here is where most informal buyouts go wrong. If your partner owns 40% of a business worth $1,000,000, their stake is not automatically worth $400,000.

A minority interest — one that cannot control decisions, cannot force a sale, and cannot easily be sold to anyone else — is worth less per share than a controlling interest. Rev. Rul. 59-60 acknowledges that ownership interests in private companies may warrant discounts that do not apply to publicly traded stock. Two are standard:

This is also the point at which a professional valuation stops being optional for most deals. Discount rates are judgment calls that a credentialed appraiser can defend and you cannot. See our guide on what a business valuation costs for what that engagement involves.

Once you have a number, how you pay it matters as much as the amount. Few buyouts are all cash at closing, and the structure is usually where a stalled negotiation unlocks.

Most US partner buyouts under $5 million run through the SBA 7(a) loan programme, which lets one partner acquire another's stake using business cash flow to support repayment rather than outside capital.

The eligibility points that most often decide whether a buyout is financeable:

• The 24-month test. Where a 7(a) loan finances more than 90% of the purchase price of a partner buyout, the remaining owner or owners must certify that they have been actively participating in the operation of the business and have held the same or an increasing ownership interest for at least the preceding 24 months.
• Debt-to-net-worth of 9:1 or less. The business's balance sheets must show a debt-to-worth ratio at or below 9:1 before the ownership change. Above that, expect to put money down.
• Independent valuation required. For partial ownership transfers, both the business and the individual acquiring the interest act as co-borrowers, and an independent third-party valuation is required to establish fair value of the shares being purchased.
• Personal guarantees. Guarantee requirements were tightened in the 2025 update. Where the exiting partner retains any stake, the guarantee position is materially different from a full exit — a change that has made partial buyouts less attractive to many sellers.
• The $5 million ceiling. The 7(a) maximum shapes deal architecture. Larger transactions are typically structured by layering a seller note and buyer equity beneath a 7(a) first lien rather than by adding a second SBA product.

Five failure modes account for most buyouts that go badly:

1. Skipping the independent valuation. A number both partners agreed over dinner has no standing with a lender, and none in court if the relationship later sours.
2. Ignoring the minority discount question entirely. Whichever side it favours, not addressing it means one party later discovers they were on the wrong end of it.
3. Underestimating what the departing partner did. If they held the key customer relationships or ran operations, the business you are buying is not the business that existed with them in it. Value what remains.
4. Leaving the business undercapitalised. A buyout that consumes all available cash and takes on maximum debt can break a business that was previously healthy. Lenders assess post-transaction viability; you should too.
5. Vague earn-out terms. "If the business does well" is not a contract term. Define the metric, the measurement period, and who calculates it.