Debt collection agencies in Illinois
State registers re-read every week · latest read: October 12, 2026
The year of the oldest collection agency licenses on the Department of Financial and Professional Regulation's register, which the state publishes as open data, ended licenses included. Fifty years of license history is what the bands on this page measure, read from the register itself.
Source: data.illinois.gov
What is the Illinois license rule for debt collectors?
Illinois requires a collection agency to hold a license from the Department of Financial and Professional Regulation before doing business in the state. The Collection Agency Act provides that no collection agency shall operate in this State, directly or indirectly engage in the business of collecting debt, solicit debt claims for others, have a sales office, a client, or solicit a client in this State, exercise the right to collect, or receive payment for another of any debt, without obtaining a license under this Act (205 ILCS 740/4). Two kinds of business sit outside that rule. Section 2.03 lists nineteen kinds of business the Act does not apply to at all, including banks and credit unions, licensed attorneys, insurance companies, and lenders and retail sellers collecting their own accounts. And Section 4 exempts an out-of-state agency whose Illinois activity is limited to collecting from Illinois debtors by interstate communication, such as telephone, mail, or email from its own offices, provided it is licensed in its home state and that state grants the same privilege to Illinois-licensed agencies. A business can therefore be collecting lawfully into Illinois and be lawfully absent from this register.
You can check any agency yourself on the state’s open data register or through the Department’s license lookup, or follow our step-by-step verification guide. The rule itself is quoted from the statute on our Illinois debt law page.
Source: ilga.gov · Last checked: September 7, 2026
Who does not have to be licensed in Illinois?
Two kinds of business. Section 2.03 lists nineteen kinds of business the Act does not apply to at all, among them banks and credit unions (unless they own or operate a collection agency), licensed attorneys, insurance companies, businesses licensed under the residential mortgage, student loan servicing, consumer legal funding and pawnbroker Acts when engaged in the activity those Acts authorize, sales finance and consumer installment loan licensees collecting accounts they purchased or loans they made under those Acts, retail sellers collecting their own installment contracts, and condominium associations collecting assessments. And Section 4 exempts an out-of-state agency whose Illinois activity is limited to collecting from Illinois debtors by interstate communication, such as telephone, mail or email from its own offices in another state, provided it is licensed in that state and that state grants the same privilege to Illinois-licensed agencies.
So a business can be collecting lawfully into Illinois and be lawfully absent from this register. That is a different thing from a collector who should be licensed and is not, and this directory does not treat the two the same. Absence from the register is never published here as a finding against a company. The exemptions are quoted from the statute on the Illinois debt law page.
What the register’s status words mean here
The Department’s register keeps ended licenses on the record with their statuses, so one company can appear several times: a current license beside older ones marked not renewed, canceled or closed. This site treats an Illinois license as in force only when the register records it as active or on probation and its term has not expired. A license on probation is read here as a license in force; whatever discipline sits behind it appears on this site only as an enforcement record quoted from the regulator’s own document, never inferred from a status word. Illinois also requires a bond of a licensee that collects for others, but the register records the license, so no Illinois page here says “bonded”.
Which debt collection agencies have the longest verified record in Illinois?
Ranked on positive, verified measures only. Rankings are never for sale.
Grouped by years continuously licensed on the Illinois Department of Financial and Professional Regulation's license register, most-established band first. Within each band, agencies are listed alphabetically: no agency is ranked above another. Full rules in the methodology.
25+ years continuously licensed (9)
| Agency | Verified license history | Credentials | Source |
|---|---|---|---|
| A/R CONCEPTS INC Barrington | 33 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CAC FINANCIAL CORP OKLAHOMA CITY | 28 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| COLLECTION PROFESSIONALS INC MACOMB | 35 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Diversified Adjustment Service Coon Rapids, MN | 32 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
| LENDING SOLUTIONS INCORPORATED Elgin | 31 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MEDICAL COMMERCIAL AUDIT INC St. Louis | 37 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MERCHANTS CREDIT GUIDE COMPANY Chicago | 51 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| RRCA ACCOUNTS MANAGEMENT INC Sterling | 37 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Sunrise Credit Services Melville, NY | 26 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
15-24 years continuously licensed (31)
| Agency | Verified license history | Credentials | Source |
|---|---|---|---|
| AMERICAN PROFIT RECOVERY INC FARMINGTON HILLS | 21 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ASCENSIONPOINT RECOVERY SERVICES LLC Coon Rapids | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BALANCED HEALTHCARE RECEIVABLES LLC NASHUA | 16 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BILATERAL CREDIT LLC EAST PROVIDENCE | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| C2C RESOURCES LLC Atlanta | 24 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CARTER-YOUNG INC Monroe | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| COAST TO COAST FINANCIAL SOLUTIONS INC Thousand Oaks | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Contract Callers Augusta, GA | 17 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
| EVEREST RECEIVABLE SERVICES INC Buffalo | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| FIRSTPOINT COLLECTION RESOURCES INC Greensboro | 20 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| FRANKLIN SERVICE INC Tupelo | 23 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| HALSTED FINANCIAL SERVICES LLC Skokie | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| INTEGRAL RECOVERIES INC Englewood | 17 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| JM ADJUSTMENT SERVICES LLC STERLING HEIGHTS | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| M3 FINANCIAL SERVICES INC Hillside | 24 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MS SERVICES LLC Casper | 24 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MUNICIPAL COLLECTIONS OF AMERICA INC LANSING | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MURPHY LOMON & ASSOCIATES INC Des Plaines | 24 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| NATIONAL COMMERCIAL SERVICES INC Los Angeles | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| National Credit Systems Atlanta, GA | 16 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
| NATIONAL MANAGEMENT RECOVERY CORP Coral Springs | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| NATIONAL RECOVERY SOLUTIONS LLC LOCKPORT | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| NORTH AMERICAN CREDIT SERVICE INC Chattanooga | 19 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| PALISADES COLLECTION LLC | 20 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| PROCOLLECT INC Dallas | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| RAUCH-MILLIKEN INTERNATIONAL INC Metairie | 15 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| RELIANT CAPITAL SOLUTIONS LLC Gahanna | 17 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| REVENUE ASSISTANCE CORP CLEVELAND | 16 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SEQUOIA FINANCIAL SERVICES Agoura Hills | 18 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| UNIVERSAL FIDELITY LP Houston | 20 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| VIRTUOSO SOURCING GROUP LLC Denver | 16 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
5-14 years continuously licensed (54)
| Agency | Verified license history | Credentials | Source |
|---|---|---|---|
| ACCREDITED COLLECTION SERVICE, INC. PAPILLION | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| AIS RECOVERY SOLUTIONS LLC IRVING | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ALLEGIANT CAPITAL RECOVERY SERVICES LLC Buffalo | 5 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ALLIANCE COLLECTION AGENCIES INC Marshfield | 6 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ALLIED ACCOUNT SERVICES, INC. Bethpage | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ALLIED INTERSTATE LLC ALLENTOWN | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| AMERICAN CAPITAL RECOVERY LLC Dallas | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ASPIRE RESOURCES INC WEST DES MOINES | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ASSETCARE LLC Dallas | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ASSOCIATES ASSET MANAGEMENT LLC NEWPORT BEACH | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BAXTER BAILEY & ASSOCIATES INC Southaven | 5 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BAYVIEW SOLUTIONS LLC St Petersburg | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BELL & WILLIAMS ASSOCIATES INC WINDHAM | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| BRENNAN & CLARK LLC Oak Brook | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CARSON SMITHFIELD LLC WOODBURY | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CAWLEY & BERGMANN LLC Newark | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CLIENT SERVICES INC Earth City | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CMI CREDIT MEDIATORS INC Philadelphia | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| COLUMBIA DEBT RECOVERY, LLC EVERETT | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CONSTRUCTION CREDIT & FINANCE GROUP, PLLC FORT MYERS | 5 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CREDIT ADJUSTMENT SVCS OF HARRISBURG INC | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| F H CANN & ASSOCIATES INC North Andover | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| FEDERAL COLLECTION AGENCY INC. | 8 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| GOLDMAN, WALKER & DIMARCO Tucson | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Harris & Harris Chicago, IL | 6 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
| HAUGE ASSOCIATES INC SIOUX FALLS | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ILLINOIS COLLECTIONS INC Atlanta | 8 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| INVESTINET LLC Greenville | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ITX HEALTHCARE LLC Findlay | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| JONATHAN NEIL & ASSOCIATES INC Woodland Hills | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| KEARNS BRINEN & MONAGHAN INC GREENVILLE | 10 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| KINUM INC VIRGINIA BEACH | 12 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| KOP COLLECTION SERVICES LLC Chicago | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| L & M ACCOUNTS INC Moline | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| LOAN SCIENCE LLC Austin | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| LOCKHART MORRIS & MONTGOMERY INC Richardson | 5 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MIDWEST FIDELITY SERVICES, LLC OTTAWA | 8 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| NATIONWIDE RECOVERY SERVICE INC Cleveland | 12 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ONE ADVANTAGE LLC LAPORTE | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| PANGAEA INTERNATIONAL RECEIVABLE SERVICES INC Kalispell | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| PARTNERS FINANCIAL SERVICES INC KIRKWOOD | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Radius Global Solutions Edina, MN | 8 years | Licensed · IL CLLA | data.illinois.gov · October 14, 2026 |
| RECEIVABLES OUTSOURCING LLC EARTH CITY | 10 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ROSS, STUART & DAWSON, INC. Grand Rapids | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| S & S RECOVERY INC Memphis | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| STATE COLLECTION SERVICE INC Madison | 5 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SYSTEMS & SERVICES TECHNOLOGIES INC Saint Joseph | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| THE CADLE COMPANY Newton Falls | 9 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| THE KAPLAN GROUP INC Pismo Beach | 12 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| TURNSTILE CAPITAL MANAGEMENT LLC San Diego | 13 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| UNIVERSAL CREDIT SERVICES INC HARTLAND | 11 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| VALOR INTELLIGENT PROCESSING LLC DALLAS | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| VERLIANCE INC STEPHENVILLE | 14 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| WILLIAMS BABBIT & WEISMAN INC Boca Raton | 7 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
Under 5 years continuously licensed (38)
| Agency | Verified license history | Credentials | Source |
|---|---|---|---|
| A.R.M. SOLUTIONS, LLC CAMARILLO | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Aargon Agency Las Vegas, NV | 2 years | Licensed · IL | data.illinois.gov · October 14, 2026 |
| AFFILIATED MANAGEMENT SERVICES, INC. MISSION | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ARSTRAT, LLC Sugar Land | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| ASTRA GLOBAL LLC JACKSONVILLE | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| Caine & Weiner Sherman Oaks, CA | 4 years | Licensed · IL CLLA | data.illinois.gov · October 14, 2026 |
| CAPITAL RECOVERY CORPORATION ALPHARETTA | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CASA RECEIVABLES MANAGEMENT, LLC | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CHANNER LLC Buffalo | under a year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| CREDIT CONTROL, LLC Earth City | 4 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| DENALI MANAGEMENT GROUP LLC Euless | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| FAIR COLLECTIONS & OUTSOURCING, INC. LAUREL | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| FIRST FEDERAL CREDIT CONTROL, INC. Beachwood | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| JNR ADJUSTMENT COMPANY, INC. PLYMOUTH | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| KEYNOTE CONSULTING, INC. Palatine | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| L J ROSS ASSOCIATES INC Jackson | 4 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| LAUNCH SERVICING, LLC SIOUX FALLS | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MCA INTERNATIONAL, INC Chicago | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MCU HOLDINGS LLC. Coral Springs | 4 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| MOMNT SERVICING COMPANY LLC ATLANTA | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| NATIONAL HEALTHCARE COLLECTIONS LLC CHESTERFIELD | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| OVAG INTERNATIONAL U.S.A., INC. MIAMI LAKES | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| PRESTIGE SERVICING COMPANY, LLC Newport Beach | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| REVCO SOLUTIONS, INC. Durham, NC | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SAGE CAPITAL RECOVERY, PLLC Hi-Nella | 4 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SENTRY CREDIT INC. Everett | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SOLAR SERVICING LLC CHEVY CHASE | under a year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SOUTH EAST CLIENT SERVICES INC. Atlanta | under a year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SOUTHERN CREDIT ADJUSTERS, INC. Rocky Mount | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SOUTHWOOD FINANCIAL LLC STERLING | 2 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SUNSTRONG MANAGEMENT LLC ANNAPOLIS | under a year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SWISHERGROUP, LLC Austin | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| SYNERPRISE CONSULTING SERVICES, INC. Mission | under a year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| T-H PROFESSIONAL & MEDICAL COLLECTIONS LTD | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| TLB COLLECTION SERVICES Westchester | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| TOWNER & KOHLER, LLC Tucson | 1 year | Licensed · IL | data.illinois.gov · October 12, 2026 |
| TRANSUBRO, LLC Oceanside | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
| TRUEACCORD CORP. LENEXA | 3 years | Licensed · IL | data.illinois.gov · October 12, 2026 |
How this ranking works
Agencies are grouped into bands by how many years they have been continuously licensed on the Illinois Department of Financial and Professional Regulation's public license register: 25 or more years, then 15-24, 5-14, and under 5. Within a band, agencies are listed alphabetically, so no agency is ranked above another and there are no ordinal positions. Only agencies whose license is active on the register appear in a band. A long license history is a verifiable public record of staying in business under the state's one legal requirement; it is not a quality rating. Rankings are never for sale: paid options are clearly labeled and can never change where an agency sits. The full rules are on the methodology page.
Common questions about Illinois debt collection
Do debt collectors have to be licensed in Illinois?
Yes, unless the business is exempt. The Collection Agency Act, 205 ILCS 740, Section 4, says that "No collection agency shall operate in this State, directly or indirectly engage in the business of collecting debt, solicit debt claims for others, have a sales office, a client, or solicit a client in this State, exercise the right to collect, or receive payment for another of any debt, without obtaining a license under this Act." The license is issued by the Department of Financial and Professional Regulation. The same section exempts an out-of-state agency whose Illinois activity is limited to collecting from Illinois debtors by interstate communication, such as telephone, mail or email from its own offices, provided it is licensed in its home state and that state grants the same privilege to Illinois-licensed agencies, and Section 2.03 lists nineteen kinds of business the Act does not apply to at all, including banks, credit unions, licensed attorneys, insurance companies, and lenders and retail sellers collecting their own accounts.
How do I check whether a collection agency is licensed in Illinois?
Two official routes. The Department of Financial and Professional Regulation publishes its complete license records as open data on the state's portal, data.illinois.gov, where the Professional Licensing dataset can be filtered to collection agencies and searched by name, with each license's status, original issue date and expiration date, ended licenses included. The Department also runs a license lookup for checking one company at a time. Illinois collection agency license numbers are nine digits beginning 017. Only a license recorded as active or on probation, with an unexpired term, is in force.
What do the status words on the Illinois register mean?
The register keeps ended licenses on the record with their statuses, so a search often returns several rows for one company: its current license beside older ones marked not renewed, canceled or closed. This site treats a license as in force only when the register records it as active or on probation and its term has not expired. Other words, including inactive and suspended, are not in force. Where the Department has taken disciplinary action against a licensee, the register records that too; this site publishes such an action only as an enforcement record quoted from the regulator’s own document, never inferred from a status word.
Why does the Illinois register go back so far?
Because the state has licensed collection agencies since the mid-1970s and the published records keep the old licenses beside the current ones. The oldest licenses on the register were issued in 1975, and the bands on this page measure how long each agency has been continuously licensed on it. That gives Illinois a real spread across all four bands from the first day, unlike California, where the state license only dates from 2022.
How long can a debt be collected in Illinois?
For a lawsuit it depends on the kind of debt. Code of Civil Procedure Section 13-206 gives ten years for "actions on bonds, promissory notes, bills of exchange, written leases, written contracts, or other evidences of indebtedness in writing", and Section 13-205 gives five years for "actions on unwritten contracts, expressed or implied" and "all civil actions not otherwise provided for". Under Section 13-206 a payment or new promise to pay made in writing restarts the ten years. Which period applies to a particular account, and when it started, are questions for a lawyer. The full rules are quoted on the Illinois debt law page.
Does an Illinois collection agency also need a bond?
An agency collecting for others does. Section 8 of the Act requires a collection agency "to file and maintain in force a surety bond, issued by an insurance company authorized to transact fidelity and surety business in the State of Illinois", in the sum of $25,000, for the benefit of creditors who obtain a judgment over money collected and not remitted, and if the bond is terminated and no new bond is filed, the license is canceled on the bond’s termination date. A debt buyer is licensed under the same Act, but Section 8.6 says that in collecting accounts it owns it "shall not be required to (i) file and maintain in force a surety bond". The register records the license, which is why this site describes Illinois agencies as licensed rather than bonded.