The Grundy County sales tax rate is 7.25% on general merchandise in 2026, combining Illinois’s 6.25% state rate with a 1% county school facility tax. Cities and villages within the county can add their own local taxes on top, so the total on your receipt may be higher depending on where you shop. The biggest recent change: on January 1, 2026, Illinois eliminated its 1% state grocery tax and handed that authority to local governments.
What You Actually Pay in Grundy County
Across unincorporated Grundy County, the combined rate on general merchandise is 7.25%. Municipalities inside the county can layer additional taxes on top of that baseline, which means two stores a few miles apart can ring up different totals on the same item.
Channahon shows how much location can matter. The village sits on the Grundy–Will county line. Stores on the Grundy County side charge 7.25%, while stores on the Will County side charge 8.00%.1Channahon Illinois. Frequently Asked Questions A quarter-mile difference in address changes the receipt.
Because municipal rates shift when local governments adopt new taxes or create business districts, the reliable way to confirm an exact rate for a specific address is the MyTax Illinois Tax Rate Finder, maintained by the Illinois Department of Revenue.2Illinois Department of Revenue. Tax Rate Database Enter the address and the tool returns the combined rate for that location.
How the 7.25% Is Built
The 7.25% on a typical Grundy County receipt is not one tax. It is layered.
The foundation is Illinois’s 6.25% state rate under the Retailers’ Occupation Tax Act.3Illinois General Assembly. 35 ILCS 120/2-10 – Rate of Tax On top of that, Grundy County imposes a County School Facility Occupation Tax at the full 1% allowed by law, which funds school infrastructure.4Illinois Department of Revenue. County School Facility Occupation Tax Illinois law caps this tax at 1%, set in quarter-percent increments; Grundy County levies the maximum. Together, those two produce the 7.25% baseline.
Individual municipalities can add more. Common add-ons include home rule occupation taxes, non-home-rule municipal taxes, and business district taxes. Business district taxes apply only to sales inside a designated district, and they do not cover drugs, medical appliances, or items that must be titled or registered with the state.5Illinois Department of Revenue. Sales Tax Rate Change Summary Not every town in the county imposes these, which is why rates vary from one community to another.
The 2026 Grocery Tax Change
This is the shift that most directly affects everyday Grundy County shoppers. Effective January 1, 2026, Illinois eliminated the 1% state sales tax on groceries entirely.6Illinois Department of Revenue. Illinois Grocery Tax Changes Effective January 1, 2026 The state no longer collects any sales tax on qualifying food bought for home consumption.
But the same law, Public Act 103-0781, lets municipalities and counties replace that revenue with their own local grocery tax of exactly 1% by ordinance. A local government has to file the ordinance with the Illinois Department of Revenue. Ordinances filed by October 1 take effect the following January 1; ordinances filed by April 1 take effect July 1 of the same year.6Illinois Department of Revenue. Illinois Grocery Tax Changes Effective January 1, 2026
The definition of “groceries” matches the old state definition: food for human consumption prepared off-premises. Alcoholic beverages, soft drinks, candy, and food prepared for immediate consumption, which includes restaurant meals, deli sandwiches, and hot bar items, are not groceries under this rule and remain taxed at the full general merchandise rate.6Illinois Department of Revenue. Illinois Grocery Tax Changes Effective January 1, 2026 Whether Grundy County or a specific municipality within it has adopted a local 1% grocery tax depends on local ordinance action. Check with your village or city clerk, or run your address through the MyTax Illinois rate finder to confirm.
Reduced-Rate and Exempt Items
Prescription drugs and qualifying medical appliances are taxed at 1% statewide instead of the full general merchandise rate.7Illinois Department of Revenue. What Is Significant About Retail Sales of Qualifying Drugs and Medical Appliances This reduced rate applies the same way in every municipality. A Grundy County pharmacy charges 1% on prescriptions, not 7.25%.
Prepared food gets no break. A sandwich from a grocery store deli, heated or assembled for immediate eating, is taxed at the full general merchandise rate. The same ingredients bought separately as raw groceries fall under the grocery tax rules above. The dividing line is whether the food is ready to eat at the point of sale.
Vehicles and Other Titled Property
Buying a car, motorcycle, boat, or anything else that must be titled or registered with the state runs on different rules than an ordinary retail purchase. These sales fall under the Illinois Use Tax Act, and the paperwork moves through the Secretary of State’s office at registration.
When you buy a vehicle from an out-of-state dealer or bring one into Illinois, you file Form RUT-25 with the Department of Revenue within 30 days. Private-party purchases use Form RUT-50. The state issues a tax receipt you present at registration, and no trade-in deduction is available on Form RUT-50 for private-party sales.8Illinois Department of Revenue. Vehicle Tax FAQs
If you buy from an Illinois dealer, the dealer usually collects the tax and files the transaction return (Form ST-556). On dealer deals, your trade-in generally reduces the taxable price before tax is calculated. One useful detail: business district taxes do not apply to titled or registered property, so a dealership inside a business district will not add that extra percentage to a vehicle purchase.5Illinois Department of Revenue. Sales Tax Rate Change Summary
Online Purchases and Use Tax
Illinois uses origin-based sourcing for sales by in-state retailers. Walk into a store in Morris and you pay Morris’s rate, regardless of where you live. For remote sellers and online retailers based outside Illinois, the rule flips: tax is based on where the item ships, so a delivery to a Grundy County address should carry the combined rate for that location.2Illinois Department of Revenue. Tax Rate Database
Most large online retailers already collect Illinois sales tax at checkout because they meet the state’s economic nexus threshold of $100,000 in annual Illinois sales. Marketplace facilitators that cross that threshold are expected to charge your local rate on items shipped to you.
When You Owe Use Tax Yourself
If you buy from an out-of-state seller that does not collect Illinois tax, you owe use tax directly to the state at the same rate you would have paid locally. Illinois keeps this manageable for individuals: if your total use tax liability for the year is $600 or less, you can report it on your annual Form IL-1040 by April 15. If you owe more than $600, you must file Form ST-44 by the last day of the month following the purchase.9Illinois Department of Revenue. Use Tax for Individuals – Questions and Answers
The use tax line appears on every IL-1040. If you have nothing to report, enter zero. Leaving it blank does not remove the obligation.9Illinois Department of Revenue. Use Tax for Individuals – Questions and Answers
If You’re Collecting Sales Tax as a Business
Any business selling tangible personal property at retail in Grundy County must register with the Illinois Department of Revenue before its first sale. Registration uses Form REG-1, filed electronically through MyTax Illinois (one to two business days) or by mail (four to six weeks).10Illinois Department of Revenue. Business Registration You also need a Federal Employer Identification Number. Once you are registered, IDOR assigns a location code tying your business to the correct tax jurisdiction within the county.
Collected sales tax is reported on Form ST-1, filed through MyTax Illinois.11Illinois Department of Revenue. ST-1 Sales and Use Tax and E911 Surcharge Return The return and payment are due by the 20th of the month following your reporting period. If the 20th falls on a weekend or holiday, the deadline shifts to the next business day.12Illinois Department of Revenue. Form ST-1 Instructions
IDOR sets your filing frequency based on average monthly liability. Businesses averaging more than $200 a month file monthly. Those averaging between $50 and $200 file quarterly. Those averaging less than $50 file annually. Most new retailers start monthly and may move to a less frequent schedule once IDOR reviews actual collections.12Illinois Department of Revenue. Form ST-1 Instructions
Missing a filing deadline triggers a two-tier penalty. The first tier is the lesser of $250 or 2% of the tax due, reduced by any timely payments. If you still have not filed within 30 days of a nonfiling notice, a second penalty applies: the greater of $250 or 2% of the tax shown due, capped at $5,000. That second-tier penalty applies even when no tax is owed. Vehicle transaction returns (Form ST-556) filed late with zero tax liability carry a flat $100 penalty instead.13Illinois Department of Revenue. Pub-103, Penalties and Interest for Illinois Taxes
Confirming the Rate for Your Address
Because municipal add-ons, business districts, and new local grocery taxes can change the number on your receipt, pulling the current rate for a specific Grundy County address through the MyTax Illinois Tax Rate Finder is the surest way to know what you should be charged.2Illinois Department of Revenue. Tax Rate Database The tool reflects locally administered taxes the state does not collect directly, which the posted baseline rate alone will not show.