Rhode Island: Prejudgment Interest Rules

The short answer

Rhode Island's prejudgment interest rule is unusually simple compared to most states: one statute, R.I. Gen. Laws § 9-21-10, covers every civil action for pecuniary damages -- contract or tort -- at a single flat rate of 12% a year, running from the date the claim accrued. The clerk of court adds it automatically; it isn't something a judge or jury decides, and a plaintiff doesn't even need to ask for it. The one real carve-out is medical malpractice, where the interest clock starts later -- from written notice of the claim or the filing date, not the date of the alleged malpractice. Interest never compounds. And while the State and local governments are ordinarily protected from prejudgment interest when a claim falls inside Rhode Island's $100,000 tort damages cap, that protection disappears when the government was acting in a proprietary, business-like capacity rather than a governmental one.

Requirements one by one

Governing law

A single statute does almost all the work: R.I. Gen. Laws § 9-21-10, titled "Interest in civil actions." Subsection (a) states the general rule for any civil action for pecuniary damages, regardless of claim type. Subsection (b) creates one narrow exception -- a different accrual date, not a different rate -- for a medical malpractice action filed on or after January 1, 1987. A second, separate statute, § 9-21-8, governs postjudgment interest (the period after judgment is entered), at the same 12% rate; § 9-21-10(a) itself cross-references this by directing that "post-judgment interest shall be calculated at the rate of twelve percent (12%) per annum."

Interest rate

Twelve percent a year, full stop -- for a contract claim, a tort claim, or anything else covered by the statute. Rhode Island doesn't peg its rate to a market benchmark the way some states do, and it doesn't set a different number for contract versus tort claims. The one adjustment: if the parties have their own written contract that already provides for interest, § 9-21-10(a) says the statute simply doesn't apply, so the contract's own rate controls instead of the statutory 12%.

When interest starts running

For an ordinary civil claim under § 9-21-10(a), interest starts "from the date the cause of action accrued" -- the date of injury for a tort claim, and generally the date of breach for a contract claim. Medical malpractice claims filed on or after January 1, 1987 work differently under § 9-21-10(b): interest starts from the date written notice of the claim was given to the malpractice liability insurer or to the health care provider, or the date the civil action was filed, whichever happens first. That can push the accrual date years later than the date of the alleged malpractice itself, since these claims are often not filed or noticed until well after treatment.

Contract vs. tort claims

Rhode Island doesn't split the two apart. The same rate, the same non-discretionary clerk-added mechanism, and the same statute apply whether the underlying claim is a breach of contract or a personal-injury tort. The only place claim type matters at all is the narrow medical malpractice carve-out in § 9-21-10(b), which changes only the accrual date for that one category of tort claim -- it doesn't create a separate rate or a separate discretionary standard.

Mandatory or discretionary

Fully mandatory, and Rhode Island's courts go further than most states in saying so: adding interest under § 9-21-10 is "a ministerial act for the clerk of the court, not an issue to be decided by the court," and once a damages claim has been "duly reduced to judgment the addition of interest is peremptory." That means a court can't decline to add it, a jury never weighs in on it, and -- unlike states where a party must move for prejudgment interest -- a Rhode Island plaintiff's failure to request it by motion has no bearing on whether it's owed.

Simple or compound

Simple interest only, for the entire prejudgment period. A federal court applying Rhode Island law put it plainly: "R.I. Gen. Laws § 9-21-10 permits only simple interest." The Rhode Island Supreme Court has reached the same conclusion for the companion postjudgment statute, holding that interest is calculated "as simple interest, not compound."

Claims against the government

Whether the State or a city, town, or other political subdivision owes prejudgment interest depends on the same line that decides whether Rhode Island's $100,000 tort damages cap (§ 9-31-2) applies at all: was the government acting in a "governmental" function, or a "proprietary" one? When the cap applies (a governmental function), Rhode Island courts have long held that prejudgment interest is unavailable, because "interest" is treated as legally distinct from "damages," and the state's statutory waiver of immunity for tort damages doesn't extend to interest. But when the government was instead engaged in a proprietary, business-like function -- running a public bus system, for instance, or operating a nursing home for veterans -- the § 9-31-2 cap doesn't apply, and neither does the interest bar: ordinary § 9-21-10 prejudgment interest attaches to the judgment exactly as it would against any private defendant, with no cap on the amount.

Other exceptions

Section 9-21-10(a) is limited to "pecuniary damages," and the Rhode Island Supreme Court has read that phrase as synonymous with compensatory damages -- meaning it doesn't reach punitive damages. A federal court applying the statute has separately held it doesn't extend to the attorney's fees and costs of pursuing the underlying lawsuit either, even where those fees are themselves an element of the plaintiff's claim. Two more limits are built directly into the statute's own text: it doesn't apply to "any contractual obligation where interest is already provided" (the contract's own rate governs instead), and it "shall not apply until entry of judgment" -- it's a prejudgment-only mechanism, handing off to § 9-21-8's identical 12% rate for the postjudgment period.

What trips people up

The most common mistake is assuming Rhode Island splits its interest rule by claim type the way most states do -- it doesn't, except for the medical malpractice accrual-date carve-out. A contract creditor and a car-accident plaintiff draw the exact same 12% rate under the exact same mechanism.

The second trap involves suing a government entity: assuming the same rule that applies to private defendants automatically applies to the State or a municipality. It doesn't -- whether prejudgment interest is available at all turns on whether the underlying government conduct was "governmental" or "proprietary," the same distinction that decides whether the $100,000 damages cap even applies, and that distinction isn't always obvious before litigation is underway.

Common questions

What's Rhode Island's prejudgment interest rate?
A flat 12% a year, for essentially every civil claim -- contract or tort -- unless a written contract already fixes its own rate.

Do I need to file a motion asking for prejudgment interest in Rhode Island?
No. Adding it is a ministerial duty of the court clerk once judgment is entered; Rhode Island courts have held that failing to request it by motion doesn't affect whether it's owed.

Does prejudgment interest in Rhode Island compound?
No. It's simple interest for the entire prejudgment period, confirmed by both state and federal courts applying § 9-21-10.

Can I collect prejudgment interest if I sue the State of Rhode Island or a city?
It depends on what the government was doing. If the claim falls inside the state's $100,000 tort damages cap (a governmental function), prejudgment interest is barred. If the government was instead acting in a proprietary, business-like capacity -- so the cap doesn't apply -- ordinary prejudgment interest applies just as it would against a private defendant.

Statutes and sources

• R.I. Gen. Laws § 9-21-10(a) -- "In any civil action in which a verdict is rendered or a decision made for pecuniary damages, there shall be added by the clerk of the court to the amount of damages interest at the rate of twelve percent (12%) per annum thereon from the date the cause of action accrued, which shall be included in the judgment entered therein. ... This section shall not apply until entry of judgment or to any contractual obligation where interest is already provided." Accessed 2026-07-05: https://webserver.rilegislature.gov/Statutes/TITLE9/9-21/9-21-10.HTM
• R.I. Gen. Laws § 9-21-10(b) -- "Subsection (a) shall not apply in any action filed on or after January 1, 1987, for personal injury or wrongful death filed against a licensed physician, hospital, clinic, health maintenance organization, professional service corporation providing health care services, dentist, or dental hygienist based on professional negligence. In all such medical malpractice actions ... there shall be added by the clerk of the court to the amount of damages interest at the rate of twelve percent (12%) per annum thereon from the date of written notice of the claim ... or the filing of the civil action, whichever first occurs." Accessed 2026-07-05: https://webserver.rilegislature.gov/Statutes/TITLE9/9-21/9-21-10.HTM
• R.I. Gen. Laws § 9-21-8 -- "Every judgment for money shall draw interest at the rate of twelve percent (12%) per annum to the time of its discharge." Accessed 2026-07-05: https://webserver.rilegislature.gov/Statutes/TITLE9/9-21/9-21-8.HTM
• R.I. Gen. Laws § 9-31-2 -- "In any tort action against the state of Rhode Island or any political subdivision thereof, any damages recovered therein shall not exceed the sum of one hundred thousand dollars ($100,000); provided, however, that in all instances in which the state was engaged in a proprietary function in the commission of the tort ... the limitation on damages set forth in this section shall not apply." Accessed 2026-07-05: https://webserver.rilegislature.gov/Statutes/TITLE9/9-31/9-31-2.htm