Illinois Local Sales Tax Calculator

Use this calculator to determine the sales tax you need to pay on purchases made in Illinois, considering the varying local tax rates.

Calculate Your Sales Tax

Results

Total Tax $0.00
Total Cost $0.00

Data Source and Methodology

All calculations are based on data from the Avalara.

The Formula Explained

The total tax is calculated using: Tax = Purchase Amount × (Tax Rate / 100)

The total cost is: Total Cost = Purchase Amount + Tax

Glossary of Variables

How It Works: A Step-by-Step Example

Example: For a purchase of $100 with a tax rate of 8%:

The tax is $100 × (8 / 100) = $8.

The total cost is $100 + $8 = $108.

Frequently Asked Questions (FAQ)

What is the sales tax rate in Illinois?

The base state sales tax rate in Illinois is 6.25%, but local taxes can increase the total to 8.25% or more.

How do I calculate sales tax?

To calculate sales tax, multiply the purchase price by the tax rate. The result is the amount of tax.

```
Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[{totalTax}`; document.getElementById('totalCost').textContent = `\]
{totalTax}`; document.getElementById('totalCost').textContent = `
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
, ', svg: { fontCache: 'global' } };

Illinois Local Sales Tax Calculator

Use this calculator to determine the sales tax you need to pay on purchases made in Illinois, considering the varying local tax rates.

Calculate Your Sales Tax

Results

Total Tax $0.00
Total Cost $0.00

Data Source and Methodology

All calculations are based on data from the Avalara.

The Formula Explained

The total tax is calculated using: Tax = Purchase Amount × (Tax Rate / 100)

The total cost is: Total Cost = Purchase Amount + Tax

Glossary of Variables

How It Works: A Step-by-Step Example

Example: For a purchase of $100 with a tax rate of 8%:

The tax is $100 × (8 / 100) = $8.

The total cost is $100 + $8 = $108.

Frequently Asked Questions (FAQ)

What is the sales tax rate in Illinois?

The base state sales tax rate in Illinois is 6.25%, but local taxes can increase the total to 8.25% or more.

How do I calculate sales tax?

To calculate sales tax, multiply the purchase price by the tax rate. The result is the amount of tax.

```
Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[{totalTax}`; document.getElementById('totalCost').textContent = `\]
{totalTax}`; document.getElementById('totalCost').textContent = `
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };, svg: { fontCache: 'global' } };

Illinois Local Sales Tax Calculator

Use this calculator to determine the sales tax you need to pay on purchases made in Illinois, considering the varying local tax rates.

Calculate Your Sales Tax

Results

Total Tax $0.00
Total Cost $0.00

Data Source and Methodology

All calculations are based on data from the Avalara.

The Formula Explained

The total tax is calculated using: Tax = Purchase Amount × (Tax Rate / 100)

The total cost is: Total Cost = Purchase Amount + Tax

Glossary of Variables

How It Works: A Step-by-Step Example

Example: For a purchase of $100 with a tax rate of 8%:

The tax is $100 × (8 / 100) = $8.

The total cost is $100 + $8 = $108.

Frequently Asked Questions (FAQ)

What is the sales tax rate in Illinois?

The base state sales tax rate in Illinois is 6.25%, but local taxes can increase the total to 8.25% or more.

How do I calculate sales tax?

To calculate sales tax, multiply the purchase price by the tax rate. The result is the amount of tax.

```
Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted LaTeX)
\[{totalTax}`; document.getElementById('totalCost').textContent = `\]
{totalTax}`; document.getElementById('totalCost').textContent = `
Variables and units
  • T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn