The sales tax rate in Collinsville, IL runs from 8.35% to 9.85%, depending on which side of the Madison–St. Clair county line the purchase happens on and whether the address falls inside one of the city’s three business districts.1Illinois Department of Revenue. Sales Tax Rate Change Summary, Effective January 1, 2025 The same item bought at a shop on the Madison County side can cost noticeably less in tax than one purchased a few blocks away in the St. Clair County portion or within a business district.
Why the Rate Changes Across Town
Collinsville straddles the Madison–St. Clair county boundary, so every sale falls under one county’s tax structure or the other. The state base rate is the same everywhere: 6.25% on general merchandise under the Illinois Retailers’ Occupation Tax.2Illinois General Assembly. 35 ILCS 120/2-10 What differs is the stack of local taxes layered on top.
As of January 1, 2025, the combined general-merchandise rates for standard locations outside the business districts are:
- Madison County portion of Collinsville: 8.35%
- St. Clair County portion of Collinsville: 8.85%
Both sides went up by 0.25% on that date because of a home rule tax adjustment by the city.1Illinois Department of Revenue. Sales Tax Rate Change Summary, Effective January 1, 2025
The main driver of the half-point gap between the two sides is the Metro-East Mass Transit District levy. In the Madison County townships, that levy is 0.25% on general merchandise. In the St. Clair County townships, it rises to 0.75%.3Illinois Department of Revenue. Mass Transit District Sales Tax The city’s home rule municipal tax of 1.25% applies equally on both sides.
Business District Surcharges Add Another 1%
Collinsville has three business districts where retailers collect an extra 1% sales tax on top of the combined rate.4Collinsville, IL. Incentives That brings the effective rate to as much as 9.35% on the Madison County side and 9.85% on the St. Clair County side. The three districts are:
- The Northeast Business District, along Beltline Road and Vandalia Street.
- The Southwest Business District, also called the St. Louis/Collinsville Road Corridor, running from the Fairmount Racetrack area west to Main Street and Hesperia Street, and along the IL 157 (Bluff Road) Corridor.
- The Fournie Lane/Horseshoe Lake Road Business District, extending into the I-255/Horseshoe Lake Road redevelopment area.
The surcharge applies only inside those geographic boundaries. A store one block outside a district line charges the standard combined rate. The city maintains a public GIS portal where property owners and retailers can check whether a specific address falls inside a business district.4Collinsville, IL. Incentives
How to Confirm the Rate for a Specific Address
Because the rate swings by as much as 1.5 percentage points within city limits, guessing isn’t reliable. The Illinois Department of Revenue provides a Tax Rate Finder tool through MyTax Illinois that returns the exact combined rate for any street address.5Illinois Department of Revenue. Tax Rate Database Retailers whose point-of-sale software calculates tax automatically can use the Department’s machine-readable address files to keep rates current. Local rate changes happen often and don’t always make the news, so plugging the store’s physical address into the rate finder each January is a sensible habit.
Grocery Food Starting January 2026
Beginning January 1, 2026, qualifying grocery food is exempt from the state portion of the Retailers’ Occupation Tax.2Illinois General Assembly. 35 ILCS 120/2-10 Before this change, grocery food carried a reduced state rate of 1%. The state’s share now drops to zero. The exemption covers food for human consumption intended to be eaten off the premises. It does not cover alcoholic beverages, soft drinks, candy, cannabis-infused products, or food prepared for immediate consumption.
This is only the state tax. Local taxes imposed by the city’s home rule authority, the county, and the Metro-East Mass Transit District may still apply to grocery purchases, so shoppers will see a reduction on their grocery bills rather than a complete elimination of tax on food. Prescription and nonprescription medicines, medical devices, insulin, and diabetic testing supplies continue to carry the 1% reduced state rate.2Illinois General Assembly. 35 ILCS 120/2-10
Use Tax on Out-of-State Purchases
If you buy something from an out-of-state retailer that doesn’t collect Illinois tax, you owe use tax directly to the state. The rates mirror the sales tax structure: 6.25% on general merchandise and 1% on qualifying drugs and medical appliances.6Illinois Department of Revenue. Use Tax Rates If you paid sales tax in the other state, you get credit for that amount and owe only the difference.
Individual taxpayers with $600 or less in annual use tax liability can report it on their Illinois income tax return (Form IL-1040) instead of filing a separate form. Liability above $600 requires Form ST-44, due by the last day of the month following each purchase.7Illinois Department of Revenue. ST-44, Illinois Use Tax Return Instructions Most large online retailers now collect Illinois tax automatically. Purchases from small out-of-state sellers, private-party transactions, and items bought while traveling remain common triggers.
Collecting Sales Tax as a Collinsville Business
Any business selling tangible personal property at retail in Collinsville must register with the Illinois Department of Revenue. There is no fee to register, and once approved you’ll receive a Certificate of Registration authorizing you to collect sales tax.8Illinois Department of Revenue. Business Registration Certificates are issued electronically through MyTax Illinois, which also serves as the portal for filing returns and making payments.
Filing frequency (monthly, quarterly, or annual) depends on your average monthly tax liability. Higher-volume businesses file more frequently. Quarterly filers with an average monthly liability of $20,000 or more must make accelerated quarterly payments. Returns are due by the 20th of the month following the reporting period.
One note on services: Illinois does not impose sales tax on the labor component of a service. When a service provider transfers tangible personal property as part of the job, only the property is taxable, not the service charge. As of January 1, 2026, this Service Occupation Tax is destination-based, calculated using the rate at the location where the property is delivered or where the customer takes possession.9Illinois Department of Revenue. Service Occupation Tax Changes
Late Filing and Late Payment Penalties
Illinois charges separate penalties for filing late and paying late, and they stack. The late-filing penalty is 2% of the tax due on the return, capped at $250. If you still haven’t filed within 30 days of receiving a nonfiling notice from the Department, an additional penalty applies: the greater of $250 or 2% of the tax shown on the return, up to $5,000.
Late-payment penalties escalate based on how long the balance remains unpaid:10Illinois Department of Revenue. Pub-103, Penalties and Interest for Illinois Taxes
- 1 to 30 days late: 2% of the unpaid amount.
- 31 or more days late: 10% of the unpaid amount.
- After an audit begins: 15% of any amount still outstanding.
- After audit completion: 20% of any amount not paid within 30 days of receiving the audit results.
Waiting until the Department starts an audit roughly doubles the penalty compared with paying voluntarily within the first month. Interest accrues on top of these penalties, so even modest balances grow quickly once they go delinquent.