What is the sales tax rate in Mount Prospect, Illinois?

The combined sales tax rate in Mount Prospect, Illinois is 10.300% as of 2026. This includes the Illinois state rate of 6.300% plus local jurisdiction taxes.

How is the Mount Prospect sales tax calculated?

Multiply your purchase amount by 10.300% (or 0.01030) to get the tax owed. For example, a $100 purchase incurs $10.30 in sales tax.

What is the Illinois state sales tax rate?

The base Illinois state sales tax rate is 6.300%. Local jurisdictions may add additional taxes on top of this rate.

Does Mount Prospect have a county sales tax?

Mount Prospect imposes an additional county-level sales tax of 1.800% on top of the state rate.

When was the Mount Prospect sales tax rate last updated?

The Mount Prospect sales tax rate was last verified on March 27, 2026. We cross-reference all rates against the official State Department of Revenue data.

Live Data: April 2026

Mount Prospect, IL Sales Tax Rate 2026

The combined sales tax rate in Mount Prospect, Illinois is 10.300%.

Combined Rate 10.300%

State6.300% County1.800% City1.000%

Mount Prospect Sales Tax Breakdown

Jurisdiction	Rate
Illinois State Sales Tax	6.300%
County Sales Tax	1.800%
City / Municipal Tax	1.000%
Special District Tax	1.300%
Total Combined Rate	10.300%

Which County Is Mount Prospect In?

Mount Prospect falls within Cook, Illinois. Cook imposes a 1.800% county-level sales tax in addition to the Illinois state base rate.

Mount Prospect ZIP Codes

The following ZIP codes are mapped to Mount Prospect for sales tax purposes. All listed codes apply the 10.300% combined rate.

60056

Nearby Tax Rates

Des Plaines 2.8 mi

10.300%

Combined Rate

View Local Rates

Prospect Heights 2.8 mi

10.100%

Combined Rate

View Local Rates

Arlington Heights 3.2 mi

10.200%

Combined Rate

View Local Rates

Business Nexus in Illinois

Economic Nexus Threshold

Selling into Illinois from out of state? Once you exceed $100,000 in annual sales or 200 transactions, you must register and collect Illinois sales tax.

FAQ: Mount Prospect Sales Tax

The combined sales tax rate in Mount Prospect, Illinois is 10.300% as of 2026.

Multiply your purchase price by 10.300% to find the tax owed. A $500 purchase would include $51.50 in sales tax.

Groceries are generally taxable in Illinois. Check the official Department of Revenue for specific exemptions.

Vehicle purchases in Mount Prospect are subject to the 10.300% combined rate, though some states apply different rules for vehicle sales. Verify with the Illinois Department of Revenue or DMV.

Register for a sales tax permit through the official Illinois Department of Revenue website. Registration is typically free and required before collecting any sales tax.

Sales Tax Calculator

Using 10.300% rate for Mount Prospect, IL

Purchase Amount ($)

Tax Amount $0.00

Total with Tax $100.00

Rate applied: 10.300% combined

Official Tax Authority

Illinois Department of Revenue

Filing Deadline: Returns due the 20th of the month following the filing period. File via MyTax Illinois.

Visit Official Portal (217) 782-3336