When a third-party collection agency is working an account, the original creditor pays the agency’s fee out of whatever it recovers. You, as the debtor, only owe an added collection fee when the contract that created the debt specifically allows it, or when a law authorizes it. That is the short answer to who pays collection agency fees, and everything else is a wrinkle on those two conditions.
How Creditors Actually Pay the Agency
Most collection agencies work on contingency. The creditor sends over the account, the agency tries to collect, and the agency keeps a percentage of whatever comes in. Nothing recovered, nothing charged. Contingency rates typically run from 25% to 50% of the collected balance, depending on the age, size, and complexity of the debt.1US Chamber of Commerce. What Is a Debt Collection Agency, and When Do You Need One? Newer debts command lower fees; accounts delinquent a year or more push the agency’s cut toward the higher end.
Here is what that looks like in practice. You owe $1,000. You pay $1,000. The agency keeps roughly $300 and forwards $700 to the creditor. The creditor absorbs the cost of the recovery service. You paid only what you originally owed. This is why most consumer debtors never see a separate “collection fee” line on what they pay.
When the Debtor Can Be Charged Extra
The picture changes when the original agreement shifts collection costs onto you. Look at the paperwork you signed when the debt was created: a credit card agreement, a medical intake form, a lease, a service contract. If it contains a clause making you liable for “reasonable collection costs,” “collection agency fees,” or attorney fees, the collector may have a legal basis to add those costs to your balance. If no such clause exists, the agency generally cannot tack on extra charges and is limited to the original balance plus any interest the contract already allowed.
Commercial debts between businesses are more likely to include a collection-cost clause. Standard consumer credit agreements vary. Before you accept an inflated balance from a collector as accurate, read the original contract.
What Federal Law Forbids Collectors From Adding
The Fair Debt Collection Practices Act sets a nationwide floor. A debt collector cannot collect any amount — including fees, interest, charges, or other expenses — unless that amount is either expressly authorized by the agreement that created the debt or permitted by law.2Office of the Law Revision Counsel. 15 USC 1692f – Unfair Practices Invented “administrative fees,” “account transfer charges,” or “processing fees” that appear nowhere in your original agreement and are not authorized by any statute are not collectable.
The Consumer Financial Protection Bureau, which enforces the FDCPA through Regulation F, has clarified that a fee is impermissible when both the original agreement and the law are silent. A later side agreement — say, a payment-plan letter that introduces new charges — does not satisfy this standard if the original contract never authorized those fees.3Federal Register. Debt Collection Practices (Regulation F) Pay-to-Pay Fees The same rule covers “pay-to-pay” convenience fees for paying by phone or credit card.
If a collector violates this rule, you can sue in federal or state court within one year of the violation. A court can award your actual damages (including any money you paid toward an illegal fee), up to $1,000 in additional statutory damages, and attorney fees and court costs. In a class action, the ceiling is $500,000 or 1% of the collector’s net worth, whichever is less.4Office of the Law Revision Counsel. 15 USC 1692k – Civil Liability
One boundary matters here. The FDCPA applies to third-party collection agencies, debt buyers, and lawyers who regularly collect for others.5Consumer Financial Protection Bureau. What Laws Limit What Debt Collectors Can Say or Do? It does not apply to the original creditor collecting its own debt. If your credit card issuer is calling you directly about its own account, these federal fee restrictions do not govern that call, though state laws still may.
State Caps and Stricter Limits
States pile their own restrictions on top of the FDCPA, and many go further. Some cap the percentage a collector can add as a collection fee, with caps generally in the range of roughly 20% to 30% of the principal balance. Others ban collection surcharges entirely for certain categories of debt, such as medical bills or small consumer accounts.
A state statute can override contract language. A collection-fee clause that is enforceable in one state may be unenforceable in another. Some states also require that any collection fee reflect actual costs rather than a flat percentage, limiting a collector’s ability to profit from the fee itself. Collectors who violate state fee rules can face statutory penalties and may be ordered to pay your legal expenses if you successfully challenge the charge. Your state attorney general’s website is a practical starting point.
Fees Added After a Court Judgment
Once a creditor or collection agency sues and wins, additional costs beyond the original debt can become legally enforceable. These are authorized by the court system rather than by your original contract:
- Post-judgment interest. Federal courts calculate this using the weekly average one-year Treasury yield from the week before the judgment was entered, compounded annually. As of early 2026, that rate has been around 3.5%. State courts set their own rates, which can be higher.6Office of the Law Revision Counsel. 28 USC 1961 – Interest7United States Bankruptcy Court Southern District of California. Post-Judgment Interest Rates
- Court costs. Filing fees, service of process fees, and similar expenses incurred during the lawsuit are commonly added to the judgment. Amounts vary widely by jurisdiction.
- Attorney fees. If the original contract includes an attorney fee clause, or a state statute authorizes them in debt collection cases, the creditor’s legal costs can be added to what you owe.
Post-judgment interest keeps accruing from the date of judgment until the debt is paid, so an unpaid judgment grows over time. If a collector sues you, responding to the complaint gives you the chance to challenge unauthorized fees before they get folded into a judgment.
How to Challenge a Fee You Don’t Recognize
Federal law gives you a specific process. Within five days of first contacting you, the collector must send a written notice stating the amount owed. You then have 30 days from receiving that notice to dispute the debt in writing, including any portion you believe is an unauthorized fee.8Office of the Law Revision Counsel. 15 USC 1692g – Validation of Debts
Once the collector receives your written dispute, it must stop collection efforts on the disputed portion until it provides verification. That verification should show the breakdown of the amount, including any fees, and identify the legal or contractual basis for each charge. If the collector cannot verify an added fee, it cannot legally continue trying to collect it.
If you believe you have been charged an illegal fee, three moves are open to you:
- Ask the collector for a copy of the original contract that created the debt, and compare its fee provisions against what is being charged.2Office of the Law Revision Counsel. 15 USC 1692f – Unfair Practices
- File a complaint with your state attorney general’s office, the Federal Trade Commission, and the CFPB.9Federal Trade Commission. Debt Collection FAQs
- Sue the collector within one year of the violation. Even without proof of specific financial harm, a court can award up to $1,000 in statutory damages plus your attorney fees.4Office of the Law Revision Counsel. 15 USC 1692k – Civil Liability
Keep everything in writing. Send dispute letters by certified mail with return receipt so you have proof of the date the collector received the dispute.
A Small Payment on an Old Debt Can Restart the Clock
Every state sets a statute of limitations on debt, a deadline after which a collector can no longer sue you. If a debt is close to that deadline or past it, making any payment, even a small one toward a disputed fee, can restart the clock in many states and give the collector a fresh window to file suit. Acknowledging the debt in writing or agreeing verbally that you owe it can have the same effect. If a collector asks you to pay a “small processing fee” to close out an old account, that payment could revive a debt that was otherwise legally uncollectable. Check your state’s statute of limitations before paying anything on an old or disputed balance.