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Yes, but only under specific conditions
Debt collectors can legally charge interest on a debt you owe — but only if the original contract permitted it or state law specifically allows it. That’s the entire rule in plain terms, and everything else in this article flows from it. If neither condition is met, any interest a collector tacks onto your balance is unlawful, and you have the right to dispute it. This distinction matters because millions of Americans deal with debt collectors each year, and the rules governing what those collectors can charge are frequently misunderstood — by consumers and, in some cases, by the collectors themselves. Knowing exactly where the legal boundary sits is the first step to protecting your finances.The two rules that decide it
Interest in debt collection is permitted only under two conditions:- The original contract you signed explicitly allowed it, or…
- The law of your state authorizes it.
If neither applies, adding interest to your balance is a violation of the Fair Debt Collection Practices Act (FDCPA) — the federal law that governs the behavior of third-party debt collectors.
The FDCPA, enforced jointly by the Federal Trade Commission (FTC) and the Consumer Financial Protection Bureau (CFPB), draws a clear line under 15 U.S.C. § 1692f: it is an unfair practice for a debt collector to collect “any amount (including any interest, fee, charge, or expense incidental to the principal obligation) unless such amount is expressly authorized by the agreement creating the debt or permitted by law.” That language is precise and intentional. The collector must be able to point to a specific clause in your original agreement or a specific state statute — not a general assumption that interest is simply owed.
It’s worth emphasizing what the FDCPA does and doesn’t cover. The law applies to third-party collectors — agencies hired to recover debts on behalf of another creditor, or companies that have purchased the debt outright. It does not, in most cases, directly govern the original creditor (the bank, hospital, or lender that extended credit to you in the first place). Original creditors are still bound by state law and the terms of your contract, but they fall outside the FDCPA’s reach. Once a debt is handed to a collection agency, however, the FDCPA applies fully.
Collection agencies vs. original creditors
The distinction between an original creditor and a collection agency is one of the most important concepts in understanding your rights.- Your original creditor — say, a credit card company or a hospital — is governed by the contract you signed and by state law, but not directly by the FDCPA. If that creditor decides to pursue collection internally rather than hire an outside firm, federal debt collection law doesn’t constrain their interest charges the same way.
- Once the debt is sold or assigned to a third-party collection agency, the FDCPA kicks in. The collection agency can only charge interest if the original agreement authorized it or state law permits it.
- Crucially, the agency cannot invent new terms or unilaterally add fees that weren’t part of your original contract. The legal authority to charge interest travels with the debt — it doesn’t expand simply because the debt changed hands.
Does the interest rate change after debt is sold?
This is one of the most common points of confusion: does the interest rate reset when a debt is sold to a collector? The short answer is no — the rate doesn’t automatically reset, increase, or start fresh. What happens depends on how the debt was treated when it was sold.- When a creditor “charges off” a debt — meaning they write it off as a loss on their books, typically after 180 days of non-payment — that accounting action doesn’t erase the debt or change its legal terms. The debt still exists.
- If the original contract allowed interest to accrue, that interest can continue to accrue after charge-off, and after the debt is sold to a collector. However, the rate cannot exceed what the original contract specified or what state law allows. A collection agency cannot apply a higher rate than the one that existed under the original agreement.
- Some collectors do attempt to apply new, higher rates after purchase. This is where disputes arise — and where the FDCPA’s plain language provides consumer protection. If a collector charges interest at a rate not sanctioned by the original contract and not permitted by your state’s law, that charge is unlawful.
Usury laws and why the limit varies by state
The maximum interest rate a debt collector can legally charge depends heavily on which state you live in. There is no single federal cap on collection interest rates — the FDCPA sets the framework but defers to state law on the actual numbers. This means your state’s usury laws are the binding ceiling. These laws are established and enforced by state legislatures, and they vary considerably from one state to the next. According to the World Population Review’s usury law tracker, general usury limits range widely across the country:- California caps general interest at 10%
- Florida at 12%
- States like New Mexico and South Dakota have set limits as high as 15%
Some states use variable formulas tied to economic indicators like the Federal Reserve discount rate rather than fixed percentages. To give a practical range:
- If you live in a state with a 10% cap, a collection agency can charge no more than 10% annual interest — assuming the original contract permitted interest in the first place.
- If your state has no applicable usury ceiling for the type of debt in question, collectors have more latitude, though they are still bound by the original contract terms.
There are also important exceptions:
- National banks chartered at the federal level can often apply the interest rate laws of their home state rather than the borrower’s state — a consequence of the landmark Supreme Court decision in Marquette National Bank v. First of Omaha Service Corp. and subsequent federal legislation.
- Credit card companies frequently incorporate in states with favorable lending laws for this reason. These exceptions are why understanding your specific debt type, and the institution that originated it, matters when evaluating whether interest charges are lawful.
Why medical debt often can’t accrue interest
Not all types of debt are treated equally when it comes to interest accrual. Medical debt and credit card debt operate under different rules, and understanding those differences can significantly affect how you respond to a collection notice. Medical debt is subject to an increasingly protective patchwork of state laws — and the rules are tightening. Unlike credit card debt, where interest charges are standard contractual terms, medical bills frequently don’t include any interest provision at all. If the original billing agreement between you and the hospital or provider didn’t authorize interest, a collection agency has no legal basis to add it. Several states have gone further by explicitly restricting or banning interest on medical debt. According to a Commonwealth Fund analysis of state medical debt protections:- Delaware and Maine now prohibit creditors from charging interest on medical debt entirely.
- New Jersey and New York have established caps on allowable interest rates.
- California bans hospitals from charging interest on accounts where the patient is on a payment plan.
- Maryland does not allow interest to accrue on medical debt until a court judgment is issued.
- Illinois allows up to 5% pre-judgment interest, rising to 9% post-judgment.
This state-level momentum reflects a broader policy shift. In 2023, 41% of American adults reported carrying debt from medical or dental bills, according to data cited by the Center for American Progress — and lawmakers have increasingly responded by limiting what collectors can extract from that debt. The core principle underlying most of these restrictions is straightforward: medical debt is involuntary. No one chooses to get sick, and punishing patients with compounding interest on an unavoidable expense runs contrary to basic consumer protection goals.
Credit card debt operates very differently:
- Interest charges are a core feature of the original contract, and cardholders explicitly agree to them when opening an account.
- Credit card issuers are also largely exempt from state usury caps, as they tend to incorporate in states with favorable lending laws.
- Once credit card debt enters collections, the collector can continue charging the contractually agreed rate — but cannot unilaterally increase it or apply a new, higher rate.
How to stop or dispute unlawful interest
If you believe a debt collector is charging interest that wasn’t authorized by your original contract or permitted by your state’s law, you have concrete legal tools to fight it. The process starts with documentation and a formal written request.
- The first and most important step is requesting a debt validation notice in writing. Under the FDCPA and the CFPB’s Regulation F, when a debt collector first contacts you, they are required to send you a validation notice — either at the time of first contact or within five days — that includes the amount of the debt, the name of the creditor, and information about your right to dispute it. According to the CFPB’s guidance on debt validation notices, once you receive this notice, you have 30 days to dispute the debt in writing.
- Send your dispute letter via certified mail and keep a copy. If you’re disputing the interest charges specifically, state clearly that you are requesting documentation showing that the original contract authorized interest at the stated rate, or identifying the state law that permits it.
- Once the collector receives a written dispute, they must pause collection of the disputed amount until they’ve provided adequate verification. This pause is your leverage: it forces the collector to produce documentation, and if they can’t, the charge is unenforceable.
- The CFPB provides sample dispute letters on its website that you can adapt to your situation. Using a certified, traceable delivery method creates a paper trail that protects you if the dispute escalates.
When to report an FDCPA violation
If a collector continues to charge or demand unlawful interest after receiving your written dispute, or if they fail to provide proper validation, they may be violating the FDCPA. You have several avenues for recourse.
- File a complaint with the CFPB at consumerfinance.gov. The FDIC’s consumer resource page on debt collection notes that two federal agencies — the CFPB (1-855-411-2372) and the FTC (1-877-FTC-HELP) — share enforcement responsibility for the FDCPA and both accept consumer complaints. The CFPB will contact the collector and attempt to facilitate a resolution; the FTC uses complaints to identify patterns of industry-wide abuse.
- File a complaint with your state attorney general’s office, especially if your state has debt collection laws that go beyond the federal standard. Many states do.
- You can sue the debt collector directly in federal or state court. The FDCPA authorizes consumers to recover actual damages, up to $1,000 in additional statutory damages, and attorney’s fees for violations. You have one year from the date of the violation to bring a lawsuit. Given that attorney’s fees are recoverable, consumer protection attorneys frequently take these cases on contingency, meaning you may pay nothing out of pocket to pursue your claim.
Frequently asked questions
No. Under the FDCPA, a collector can only charge interest if the original contract authorizing the debt explicitly permitted it, or if state law specifically allows it. Interest that appears out of nowhere — added unilaterally by the collection agency without a contractual or legal basis — is unlawful. Request the original contract and ask the collector to identify the specific clause or statute that authorizes the charge.
Yes, indirectly. The statute of limitations governs how long a creditor or collector has to sue you to collect a debt. Once the statute of limitations has expired, the debt is "time-barred," meaning the collector loses the right to take you to court. A time-barred debt can still be reported to credit bureaus (for a limited time), and collectors can still contact you — but they cannot sue, and any interest that would have accrued post-expiration is practically unenforceable. Making a payment on a time-barred debt can restart the clock in some states, so proceed carefully.
Disputing inaccurate or unlawful charges on your credit report is a separate process governed by the Fair Credit Reporting Act (FCRA). If a collection account on your credit report includes interest you believe is unauthorized, you can dispute the inaccuracy directly with the credit bureau reporting it. The bureau must investigate within 30 days and remove information it cannot verify. Keep records of everything.
The same FDCPA rule that governs interest applies to fees: a collector may only add fees that are expressly authorized by the original agreement or permitted by law. Collection fees, processing charges, and similar add-ons that have no basis in your original contract are just as unlawful as unauthorized interest. If your validation notice includes line items you don't recognize, request documentation for each one.
A collector who continues collecting on a disputed amount — without first providing proper verification — is violating the FDCPA. Document everything: keep copies of your dispute letter, proof of delivery, and any subsequent communications from the collector. Then file complaints with the CFPB, FTC, and your state attorney general, and consult a consumer protection attorney. The one-year statute of limitations for FDCPA lawsuits means you should act promptly.
There’s always JG Wentworth…
Do you have $10,000 or more in unsecured debt? If so, there’s a good chance you’ll qualify for the JG Wentworth Debt Relief Program.** Some of our program perks include:
- One monthly program payment
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- Average debt resolution in as little as 24-60 months
- We only get paid when we settle your debt
- Some clients save up to 44% before program fees
If you think you qualify for our program, give us a call today so we can go over the best options for your specific financial needs. Why go it alone when you can have a dedicated team on your side?
* This information is provided for educational and informational purposes only. Such information or materials do not constitute and are not intended to provide legal, accounting, or tax advice and should not be relied on in that respect. We suggest that You consult an attorney, accountant, and/or financial advisor to answer any financial or legal questions.
** Program length varies depending on individual situation. Programs are between 24 and 60 months in length. Clients who are able to stay with the program and get all their debt settled realize approximate savings of 44% before our 26% program fee. This is a Debt resolution program provided by JGW Debt Settlement, LLC (“JGW” of “Us”)). JGW offers this program in the following states: AL, AK, AZ, AR, CA, CO, FL, ID, IN, IA, KY, LA, MD, MA, MI, MS, MO, MT, NE, NM, NV, NY, NC, OK, PA, SD, TN, TX, UT, VA, DC, and WI. If a consumer residing in CT, GA, HI, IL, KS, ME, NH, NJ, OH, RI, SC and VT contacts Us we may connect them with a law firm that provides debt resolution services in their state. JGW is licensed/registered to provide debt resolution services in states where licensing/registration is required.
Debt resolution program results will vary by individual situation. As such, debt resolution services are not appropriate for everyone. Not all debts are eligible for enrollment. Not all individuals who enroll complete our program for various reasons, including their ability to save sufficient funds. Savings resulting from successful negotiations may result in tax consequences, please consult with a tax professional regarding these consequences. The use of the debt settlement services and the failure to make payments to creditors: (1) Will likely adversely affect your creditworthiness (credit rating/credit score) and make it harder to obtain credit; (2) May result in your being subject to collections or being sued by creditors or debt collectors; and (3) May increase the amount of money you owe due to the accrual of fees and interest by creditors or debt collectors. Failure to pay your monthly bills in a timely manner will result in increased balances and will harm your credit rating. Not all creditors will agree to reduce principal balance, and they may pursue collection, including lawsuits. JGW’s fees are calculated based on a percentage of the debt enrolled in the program. Read and understand the program agreement prior to enrollment.
SOURCES CITED
- Federal Trade Commission — Fair Debt Collection Practices Act — Full Text (15 U.S.C. §§ 1692–1692p)
- Consumer Financial Protection Bureau — What information does a debt collector have to give me about the debt?
- World Population Review — Usury Laws by State 2026
- UpCounsel — Understanding State Usury Laws and Interest Rate Limits
- Commonwealth Fund — States Continue to Enact Protections for Patients with Medical Debt (2024)
- Federal Deposit Insurance Corporation — Having a Problem with a Debt Collector? You Also Have Protections
- Center for American Progress — Event Recap: State Policy Efforts to Avert and Alleviate Medical Debt (2024)
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The information is provided for educational and informational purposes only. Such information or materials do not constitute and are not intended to provide legal, accounting, or tax advice and should not be relied on in that respect. We suggest that You consult an attorney, accountant, and/or financial advisor to answer any financial or legal questions.
* Program length varies depending on individual situation. Programs are between 24 and 60 months in length. Average graduated clients realize approximate savings of 46% before our program fee and 21% after program fee. This is a Debt resolution program provided by JGW Debt Settlement, LLC (“JGW” of “Us”). JGW offers this program in the following states: AL, AK, AZ, AR, CA, CO, FL, ID, IN, IA, KY, LA, MD, MA, MI, MS, MO, MT, NE, NM, NV, NY, NC, OK, PA, SD, TN, TX, UT, VA, DC, and WI. If a consumer residing in CT, GA, HI, IL, KS, ME, NH, NJ, OH, RI, SC and VT contacts Us we may connect them with a law firm that provides debt resolution services in their state. JGW is licensed/registered to provide debt resolution services in states where licensing/registration is required.
Debt resolution program results will vary by individual situation. As such, debt resolution services are not appropriate for everyone. Not all debts are eligible for enrollment. Not all individuals who enroll complete our program for various reasons, including their ability to save sufficient funds. Savings resulting from successful negotiations may result in tax consequences, please consult with a tax professional regarding these consequences. The use of the debt settlement services and the failure to make payments to creditors: (1) Will likely adversely affect your creditworthiness (credit rating/credit score) and make it harder to obtain credit; (2) May result in your being subject to collections or being sued by creditors or debt collectors; and (3) May increase the amount of money you owe due to the accrual of fees and interest by creditors or debt collectors. Failure to pay your monthly bills in a timely manner will result in increased balances and will harm your credit rating. Not all creditors will agree to reduce principal balance, and they may pursue collection, including lawsuits. JGW’s fees are calculated based on a percentage of the debt enrolled in the program. Read and understand the program agreement prior to enrollment.
JG Wentworth does not pay or assume any debts or provide legal, financial, tax advice, or credit repair services. You should consult with independent professionals for such advice or services. Please consult with a bankruptcy attorney for information on bankruptcy.
