An acceleration clause is a provision in a loan agreement or promissory note that lets the lender declare the entire outstanding balance immediately due and payable upon a triggering event — typically a missed payment, a covenant violation, or an uncured default — rather than only pursuing the overdue installments.
Acceleration is the mechanism that turns a missed-payment problem into a full-balance problem. Without an acceleration clause, a lender could only sue for the overdue installments as they came due, one at a time. With it, once the borrower defaults and any applicable cure period expires (see notice-of-default), the lender can demand the entire remaining principal, accrued interest, and often default interest and fees, all at once. Common acceleration triggers: a monetary default (missed payment past the cure period), a covenant default (breach of a financial or operating covenant in the loan agreement), a cross-default (default on a separate loan or obligation that the current loan agreement defines as a default under this loan too — see cross-default-clause), a bankruptcy filing, or a change-of-control or unauthorized sale of the collateral (a due-on-sale provision is a specific form of acceleration trigger tied to a transfer of the secured property, common in commercial real estate loans). Most commercial acceleration clauses are optional ("may declare due"), giving the lender discretion whether to accelerate rather than requiring it automatically — this preserves room for workout negotiations. A minority are automatic on certain triggers (often bankruptcy filings), accelerating the debt the instant the trigger occurs without requiring further lender action. UCC Article 9 governs acceleration and enforcement for secured transactions and requires lenders to act in good faith under UCC § 1-304 when exercising acceleration and default remedies — a lender can't accelerate in bad faith or for a pretextual reason unrelated to a genuine default. Acceleration clauses interact closely with cross-default clauses in a borrower's other financing: accelerating one loan can trigger acceleration rights in every other loan agreement that names the first loan as a cross-default event, which is why lenders and borrowers negotiating multi-loan capital stacks pay close attention to cross-default language. Acceleration also affects personal guarantees. Once a loan is accelerated, a guarantor's exposure typically shifts from the missed installments to the entire outstanding balance, since the guarantee generally covers the full obligation once it becomes due.
The most common triggers are an uncured monetary default (missed payments past the cure period specified in a notice of default), a covenant violation, a cross-default with another loan, a bankruptcy filing, or an unauthorized sale or transfer of the collateral (a due-on-sale trigger). The exact triggers are defined in the loan agreement or promissory note — they vary by lender and loan type.
Rarely can it be removed entirely — acceleration clauses are standard in nearly all commercial lending. What's more negotiable are the triggers and cure periods: borrowers with leverage (strong credit, competitive financing offers) can sometimes negotiate longer cure periods, narrower covenant-default triggers, or carve-outs for specific cross-default scenarios. A commercial attorney should review these terms before signing.
Once a loan is accelerated, the guarantor's obligation generally shifts from covering only the missed payments to covering the entire accelerated balance, since the guarantee typically covers the full debt once it becomes due. This is one reason acceleration is a serious event for a business owner who signed a personal guarantee — it can convert a temporary cash-flow problem into full exposure of personal assets.
Most commercial acceleration clauses are optional — the lender "may" declare the balance due, giving it discretion rather than an automatic obligation to accelerate. This is why lenders often prefer negotiating a workout (forbearance, modification) over accelerating immediately: acceleration and collateral enforcement are more expensive and less certain to recover full value than a negotiated cure. A minority of clauses, often tied to a bankruptcy filing, accelerate automatically.