For most business buyers, signing the Letter of Intent feels like the finish line — the moment when the deal is essentially done. In reality, it is the starting line. Everything that happens after the LOI — the due diligence process, the purchase agreement negotiation, the financing finalization, the closing mechanics, and the post-closing transition — requires as much preparation, attention, and professional advisory support as everything that came before. Understanding what happens at each stage, what can go wrong, and how to manage the process to a successful close is essential knowledge for any buyer or seller who wants their transaction to end where it should: at the closing table with both parties satisfied.

Post-LOI transaction failure rates in the lower middle market are meaningful. M&A advisory data suggests that a significant percentage of deals that reach LOI stage fail to close — with post-LOI due diligence findings being the most common cause, followed by financing challenges and purchase agreement negotiation breakdowns. Buyers and sellers who understand the post-LOI process and prepare for its most common challenges dramatically improve their probability of closing successfully.

Step 1 — Exclusivity Begins (Day 1)

The moment the LOI is signed, exclusivity begins. The seller has agreed to stop marketing the business and to give the buyer an exclusive period — typically 45–90 days — to complete due diligence and negotiate a definitive agreement. This period begins the buyer's most intensive phase of work and the seller's most demanding period of cooperation. Both parties should treat the exclusivity period as a shared commitment to efficiency: the buyer should be organized, responsive, and systematic in their due diligence; the seller should be cooperative, transparent, and prompt in providing requested information.

The first week after LOI signing is often consumed by kickoff logistics: introductions between the due diligence teams, agreement on data room access and organization, scheduling of management meetings and facility visits, and engagement letters with advisory firms. Buyers who are well-prepared — who have their due diligence request list ready, their advisor team assembled, and their financing process initiated — can use this first week productively rather than losing it to organizational setup.

Step 2 — Full Due Diligence (Days 1–60)

Full due diligence runs concurrently with the early stages of purchase agreement negotiation. The buyer's team — typically including an M&A attorney, an accounting firm conducting the QofE review, and potentially industry consultants and operational advisors — systematically reviews the business across all relevant dimensions. Financial due diligence typically proceeds first, as its findings often inform the scope of legal and operational investigation.

The seller's obligations during due diligence are substantial: providing organized access to the data room, making management available for interviews, answering follow-up questions promptly, and operating the business in the ordinary course without making material changes. Sellers who treat due diligence requests as burdensome administrative exercises rather than as a legitimate and necessary part of the process create friction that delays closing and sometimes damages the relationship with the buyer irrevocably.

Due diligence findings that are material — findings that substantively affect the buyer's understanding of the business's financial performance, legal status, or operational risk — should be discussed promptly between the parties. Deferring these conversations until the end of the due diligence period, when both parties have already invested maximum time and energy, almost always produces more adversarial negotiations than addressing findings as they emerge.

⚖️ Step 3 — Purchase and Sale Agreement Negotiation (Days 30–75)

The Purchase and Sale Agreement (PSA) is the definitive legal document governing the transaction. It is drafted by the buyer's M&A attorney based on the LOI terms and the findings of due diligence, then reviewed and negotiated by the seller's attorney. The PSA typically runs 40–100 pages in the lower middle market and covers: purchase price and working capital mechanics, representations and warranties by both parties, closing conditions, indemnification provisions, post-closing covenants (non-compete, non-solicitation, transition assistance), and any specific deal terms negotiated at LOI.

The most heavily negotiated PSA provisions typically include the representations and warranties — factual statements by the seller about the business that, if later found to be inaccurate, create indemnification obligations — and the indemnification caps, baskets, and survival periods that define the seller's post-closing liability exposure. Sellers should understand that representations and warranties are not formalities — they are substantive legal commitments, and inaccurate reps can result in significant post-closing liability. Contact our advisory team for guidance on navigating the PSA negotiation process, or begin a confidential consultation to understand how we prepare sellers for every stage of the transaction process.

Step 4 — Financing Finalization (Days 20–75)

Buyers who are using debt financing — SBA loans, conventional bank financing, or mezzanine debt — must coordinate their financing process with the due diligence and PSA negotiation timelines. Bank underwriting requires many of the same documents as buyer due diligence (three years of business tax returns, interim financial statements, a business plan and financial projections), and banks will not issue final loan commitments until they have reviewed due diligence findings and received an executed or near-executed purchase agreement.

Financing delays are one of the most common sources of exclusivity period extensions and deal stress post-LOI. Buyers who initiate their financing process on the day they sign the LOI — providing their lender with all available documents immediately and staying in constant communication about document requests and underwriting status — significantly reduce their risk of financing-related delays. Lenders who specialize in SBA acquisition lending and who have relationships with the advisory teams managing the transaction can often move through underwriting more efficiently than general business lenders unfamiliar with M&A financing structures.

Step 5 — Closing Day

Closing day is the culmination of months of work. All documents are executed — the PSA, financing documents, assignment agreements, employment agreements with key employees, non-compete agreements, and any other transaction documents — and the wire transfers are initiated. In most lower middle market transactions, closing is coordinated by the attorneys, who manage the flow of documents and funds to ensure that all conditions to closing have been satisfied before any transfer of ownership or consideration occurs.

Post-closing, the buyer immediately assumes operational responsibility for the business. The transition plan — which should have been developed during the due diligence period, not scrambled together on closing day — goes into effect. The seller's transition assistance period begins per the terms agreed in the PSA, providing the continuity of knowledge transfer that both customer relationships and operational continuity require.

❓ Frequently Asked Questions

What is a representations and warranties insurance policy and should I consider it?

Representations and warranties (R&W) insurance is a policy that covers losses arising from breaches of the seller's representations and warranties in the PSA. Buyers purchase R&W insurance to replace or supplement the seller's indemnification obligation, while sellers benefit from cleaner exits with lower escrow requirements and reduced post-closing liability exposure. R&W insurance has become increasingly common in lower middle market transactions above $10M in enterprise value and is worth exploring with an insurance broker who specializes in M&A products for any transaction of meaningful size.

What is a closing escrow and how does it work?

A closing escrow is a portion of the purchase price — typically 5–15% — held by a neutral third-party escrow agent after closing, for a defined period (usually 12–24 months), as security for the seller's post-closing indemnification obligations. If a covered claim arises during the escrow period, the buyer can draw from the escrow rather than chasing the seller for a cash payment. At the end of the escrow period, any remaining balance is released to the seller. Escrow is a standard feature of most lower middle market transactions.

Can the seller back out after the PSA is signed?

The PSA is a binding contract. If the seller attempts to walk away after PSA execution without a legitimate closing condition failure, they face potential breach of contract liability. The buyer may seek specific performance (requiring the seller to close as agreed) or monetary damages. Similarly, the buyer who fails to close without a legitimate closing condition failure faces comparable liability to the seller. Once the PSA is signed, both parties are legally committed to closing unless a defined closing condition fails to be satisfied.

Final Thoughts

The post-LOI phase of a business acquisition is where professionalism, preparation, and experienced advisory support pay their greatest dividends. The buyers and sellers who close successfully — who navigate due diligence findings, PSA negotiations, and financing complexity without losing momentum or damaging the relationship — are the ones who entered the process knowing what to expect at every stage. Know the road before you start driving, assemble your team before the process begins, and approach each stage with the organized intensity that successful deal-making demands.