What Is a Commitment Letter?
When a private equity firm signs a leveraged buyout, the debt that funds most of the purchase price will not actually be raised until closing, often months later. The commitment letter bridges that gap: the arranging banks legally commit to provide the loans and any bridge facilities on the terms attached as exhibits, so the buyer can sign a purchase agreement without a financing contingency.
The commitment papers usually consist of the letter itself, detailed term sheets for each debt facility, and a separate fee letter that keeps the banks' economics confidential. Because US M&A practice generally expects buyers to show committed financing at signing, sellers and their advisors scrutinize these documents as closely as the purchase agreement itself.
Key Provisions and Mechanics
Conditionality is deliberately thin. Under the market convention often called SunGard or certain funds conditionality, funding is conditioned only on a short list of items, such as the accuracy of specified representations and the absence of a material adverse change at the target, so lenders cannot walk for reasons the buyer cannot control. The fee letter contains market flex provisions letting arrangers raise pricing or adjust the structure within agreed caps if syndication struggles.
Lenders earn commitment fees for standing ready to fund, plus ticking fees if the deal drags on before closing. When the permanent financing includes high-yield bonds, the letter includes a bridge loan commitment as a backstop: if the bonds cannot be sold by closing, the banks fund the bridge and the borrower pays escalating rates until the takeout happens.
Why Commitment Letters Matter in Deals
For a seller running an auction, the quality of a bidder's commitment papers is a direct read on certainty of close. A bid backed by fully committed financing with tight conditionality beats a nominally higher bid with loose funding conditions. If the debt fails to fund and the deal breaks, the buyer typically owes the seller a reverse termination fee, so sponsors negotiate the letter to make a funding failure as unlikely as possible.
Analysts on live deals summarize commitment papers, track flex terms against market conditions, and model how ticking fees and original issue discount affect deal economics. Understanding how the letter, the fee letter, and the purchase agreement interlock, especially around what happens when financing falls through, is a recurring topic in both LevFin and M&A interviews.
