Prejudgment Interest in New York Breach of Contract Cases: Why the 9% Rate Changes Everything for NYC Businesses

You win a $4 million breach of contract case in Manhattan Supreme Court after three years of litigation. The judge signs the judgment. Then your lawyer tells you the number just grew by more than a million dollars — because prejudgment interest in New York breach of contract cases runs at 9% per year, calculated back to the day the contract was breached. That's not a bonus. That's the law. And most business owners running $1M–$10M disputes don't understand how dramatically this single rule reshapes settlement leverage, damages exposure, and litigation timing in New York commercial cases.

At Yassi Law P.C., we routinely see defendants stunned when the interest calculation hits — and plaintiffs delighted. The 9% figure hasn't moved in decades, even as market rates have swung wildly. Here's what you need to know before you file or defend a commercial contract case in New York.

What is prejudgment interest in New York breach of contract cases?

Prejudgment interest is money a New York court adds to your damages award to compensate you for being deprived of funds you were owed during the period between the breach and the judgment. Under CPLR § 5001(a), interest "shall be recovered upon a sum awarded because of a breach of performance of a contract." The word "shall" matters. In contract cases, prejudgment interest isn't discretionary — it's mandatory as a matter of right.

The rate is set by CPLR § 5004 at 9% per annum, simple interest. It has been 9% since 1981. To put that in perspective, the Federal Reserve Bank of New York reports that the federal funds rate has hovered well below 6% for most of the past four decades, meaning New York's statutory rate has often been two to three times what a defendant could earn holding the same money in the market.

The policy behind the rule is straightforward. If a party breaches a contract and holds onto money that belongs to someone else, that party has effectively taken an involuntary loan. The 9% rate is New York's answer to what that loan should cost.

Prejudgment interest applies to virtually every contract claim — breach of a supply agreement, unpaid invoices, wrongful termination of a distribution deal, failed acquisitions, breached leases. It also applies to lost profits damages and to consequential damages once they've been proven and quantified.

When does prejudgment interest start accruing under CPLR 5001?

Prejudgment interest starts accruing on the earliest date the cause of action existed — meaning the date of the breach, not the date you filed the lawsuit. This distinction is worth millions in the right case.

CPLR § 5001(b) says interest "shall be computed from the earliest ascertainable date the cause of action existed." If damages were incurred at various times, the court may compute interest from a single reasonable intermediate date. That flexibility matters when your damages accrued monthly over a multi-year contract — for example, unpaid royalties or missed distribution payments across a three-year term.

Consider a real-world scenario. You run a Long Island City food distributor and your grocery-chain customer stops paying on a five-year supply contract in June 2022. You sue in September 2023. Trial ends in early 2027 with a $2.8 million verdict in your favor. Interest runs from June 2022, not September 2023. That's roughly 4.75 years at 9% simple — approximately $1.2 million on top of the verdict. The delay in filing didn't hurt you. The clock started at breach.

Once you get to verdict, interest continues to run. CPLR § 5002 tacks on interest from the date of the verdict or decision until judgment is entered, and CPLR § 5003 keeps interest running on the judgment itself until it's paid. So a defendant who drags out post-trial motions or appeals is still bleeding 9% the entire time.

Most defendants miss that a pre-suit demand letter or a formal notice of breach — even one sent years before litigation — can lock in an early accrual date and become one of the most valuable exhibits in the case.

How much can prejudgment interest add to a $1M–$10M commercial judgment?

Prejudgment interest can easily add 30% to 60% to a commercial judgment in a case that takes several years to resolve, and it can more than double the recovery in older disputes. The math is simple, but the numbers are staggering.

Take a $3 million breach of contract claim where the breach occurred four years before judgment. At 9% simple interest, you're looking at $270,000 per year, or $1.08 million in accumulated prejudgment interest. On a $7 million claim breached five years ago, you're at $3.15 million in interest alone — nearly half again the underlying damages. Complex business cases in the Commercial Division routinely take substantial time to reach disposition, and cases with appeals can stretch several years from breach to final payment. Every one of those years is another 9%.

Because CPLR § 5004 uses simple interest rather than compound interest, the numbers don't grow exponentially — but they don't need to. The 9% flat rate is high enough on its own that most defendants underestimate their exposure by a substantial margin when evaluating settlement offers.

New York courts have repeatedly held that prejudgment interest is intended to make the wronged party whole, not to punish the defendant. The landmark decision in Love v. State, 78 N.Y.2d 540 (1991), confirmed that CPLR § 5001 makes prejudgment interest mandatory in contract and property-damage cases. Courts don't have discretion to reduce the rate or refuse to award it just because 9% seems generous in a low-rate environment.

There are edge cases. If you unreasonably delayed prosecuting your case — say, you sat on a claim for years without a good reason — a defendant may argue laches to try to cut off some of the interest period. But absent extreme circumstances, that argument rarely succeeds.

Can you contract around New York's 9% prejudgment interest rate?

Yes — parties to a commercial contract can specify a different prejudgment interest rate, and New York courts will generally enforce the contractual rate over the statutory 9%. But there are limits, and drafting matters.

The most common approach is a clause that says something like: "Any amounts owed under this Agreement that are not paid when due shall accrue interest at the rate of [X]% per annum until paid in full." If X is higher than 9%, you've increased your recovery. If X is lower, you've cut it. This is a lever both sides can pull during negotiation, and it's often ignored during contract drafting because nobody's thinking about litigation on the day they sign.

There are two important guardrails. First, New York's civil usury cap under General Obligations Law § 5-501 caps interest rates on most loans at 16%, and criminal usury under Penal Law § 190.40 kicks in at 25%. But New York courts have long held that the usury statutes don't generally apply to commercial contracts between businesses for the sale of goods or services — they're designed to protect borrowers in lending transactions, not commercial counterparties. Still, if you write a 30% default-interest clause into a $5 million supply agreement, expect a fight.

Second, the clause must actually cover the situation. A rate that applies only to "late invoices" won't necessarily apply to a broader damages award for repudiation or lost profits. Careful drafting means either broadening the clause or accepting that the statutory 9% will apply to categories the contract doesn't address.

Experienced commercial litigators watch for interest clauses in confession-of-judgment provisions, promissory notes, and factoring agreements — where a contractual rate above 9% can transform the economics of collection. If you're negotiating a large commercial contract in New York, this is one of the cheapest paragraphs to add and one of the most valuable at the back end. It pairs naturally with a fee-shifting clause and with a well-drafted liquidated damages provision.

How should prejudgment interest change your commercial litigation strategy?

Prejudgment interest should reshape almost every strategic decision you make in a New York contract dispute — from when you file, to how you evaluate settlement, to whether you pursue an appeal.

If you're the plaintiff, time is on your side. The longer the case takes, the more interest you accumulate. That doesn't mean you should file frivolous motions to slow things down, but it does mean you should push back against artificially low settlement offers made under time pressure. A defendant offering you 70 cents on the dollar of your damages number is really offering you closer to 50 cents once you factor in the interest they're trying to avoid.

If you're the defendant, time is your enemy. Every year of litigation adds 9% to your exposure. This changes the calculus on motion practice, discovery disputes, and settlement timing. A settlement paid today at 100% of the underlying damages number can be cheaper than a judgment paid three years from now at 100% of damages plus 27% in accrued interest. Sophisticated defense counsel run interest projections at every settlement conference. Most defendants who lose big in New York commercial cases do so partly because they misjudged this dynamic.

Prejudgment interest also affects how you plead damages. Because interest starts from the earliest ascertainable date, you want your complaint to identify — clearly and specifically — when the breach occurred and when each element of damages was suffered. A vague complaint gives the court flexibility to pick a later accrual date. A precise complaint pins down the earliest date and maximizes recovery. This becomes especially important in cases involving anticipatory repudiation, where the breach date may be the day the counterparty declared it wouldn't perform, rather than the later date performance was actually due.

Finally, prejudgment interest interacts with the decision of when to stop performing. If you continue performing after a material breach in the hopes of preserving the relationship, you may inadvertently push out the accrual date for interest on damages that arise later. Documenting the breach in writing when it happens — with a formal notice — locks in the earliest possible date and maximizes what you'll ultimately recover.

Frequently Asked Questions

Does prejudgment interest apply to lost profits and consequential damages?

Yes. New York courts award prejudgment interest on lost profits, consequential damages, and other quantifiable losses arising from breach of contract, as long as the damages can be traced to a specific date or reasonable intermediate date. The interest runs from when the damages were suffered, not from when the court ruled on them.

Is New York prejudgment interest simple or compound?

Simple. Under CPLR § 5004, prejudgment interest accrues at 9% per annum, not compounded. That said, once judgment is entered, the interest amount that has accrued gets added to the principal for purposes of post-judgment interest calculations, which effectively creates a limited compounding effect at the judgment stage.

Does the 9% rate apply in federal court sitting in diversity?

Generally yes, when New York substantive law governs the contract. Federal courts sitting in diversity typically apply the forum state's rules on prejudgment interest as a matter of state substantive law, meaning a New York-governed contract dispute in the Southern District will usually carry the same 9% CPLR § 5004 rate as it would in state court. Post-judgment interest in federal court follows the lower federal rate under 28 U.S.C. § 1961, which can be a meaningful difference on appeals.

Can I get prejudgment interest on an equitable claim like unjust enrichment?

Sometimes. CPLR § 5001(a) also allows interest on sums awarded because of "an act or omission depriving or otherwise interfering with title to, or possession or enjoyment of, property," and courts have interest-bearing discretion in equity cases. For pure equitable claims, the interest award is discretionary rather than mandatory, but it's frequently granted where the equitable relief involves a monetary component.

The bottom line for NYC businesses

Prejudgment interest at 9% is one of the most underappreciated features of New York commercial litigation. It rewards patient plaintiffs, punishes stubborn defendants, and can add seven figures to a $1M–$10M judgment. Understanding how CPLR §§ 5001, 5002, and 5004 interact — and how to draft around them in your contracts — is essential to protecting your business.

Written by Reza Yassi | LinkedIn

If you or your business is involved in a New York breach of contract dispute and want to understand how prejudgment interest affects your case, the team at Yassi Law P.C. is ready to help. Call us today at 646-992-2138 for a consultation.

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