Sales tax in Seneca, IL
The combined sales tax rate in Seneca, IL is about 8.25%, and ranges from 6.25% to 8.25% depending on the exact address.
Estimated from 3 ZIP codes covering Seneca. Enter your ZIP code in the calculator for a closer figure.
- ZIP codes
- 3 on file, every one crossing the city line
- County
- La Salle County
ZIP codes in Seneca
3 on file, every one crossing the city line. Each has its own page.
3 ZIP codes crossing the city line
Part of each of these lies outside Seneca. An address in one may be taxed at a neighbour's rate instead, and the figure shown is the most likely one across the whole ZIP code.
Who levies sales tax across Seneca's ZIP codes
Each government below levies its own share, but not all of them reach every address: the ZIP codes covering Seneca reach into more than one county and city, and an address pays only the shares whose boundary it falls inside.
| Jurisdiction | Type | Rate | Applies to | Effective | Source |
|---|---|---|---|---|---|
| Illinois | state | 6.25% | all 3 ZIP codes | Jan 1, 1990 | Illinois machine-readable sales tax rate files |
| Grundy County | county | 0% | 2 of 3 ZIP codes | Jan 1, 1990 | Illinois machine-readable sales tax rate files |
| Kendall County | county | 1% | 1 of 3 ZIP codes | Jul 1, 2007 | Illinois machine-readable sales tax rate files |
| Seneca | city | 0% | all 3 ZIP codes | Jan 1, 1999 | Illinois machine-readable sales tax rate files |
| Seneca | city | 0% | 2 of 3 ZIP codes | Jan 1, 1990 | Illinois machine-readable sales tax rate files |
| Channahon | city | 1% | 1 of 3 ZIP codes | Jan 1, 1994 | Illinois machine-readable sales tax rate files |
| Channahon | city | 1% | 1 of 3 ZIP codes | Aug 1, 2026 | Illinois machine-readable sales tax rate files |
| Lisbon | city | 0% | 1 of 3 ZIP codes | Jul 1, 2007 | Illinois machine-readable sales tax rate files |
| Marseilles | city | 1% | 1 of 3 ZIP codes | Jan 1, 2026 | Illinois machine-readable sales tax rate files |
| Minooka | city | 1% | 1 of 3 ZIP codes | Jan 1, 2025 | Illinois machine-readable sales tax rate files |
| Minooka | city | 1% | 1 of 3 ZIP codes | Jan 1, 2025 | Illinois machine-readable sales tax rate files |
| Minooka | city | 1% | 1 of 3 ZIP codes | Aug 1, 2026 | Illinois machine-readable sales tax rate files |
| Morris | city | 0% | 1 of 3 ZIP codes | Jan 1, 1990 | Illinois machine-readable sales tax rate files |
No total is shown because more than one county and city is listed. An address falls inside only one of each, so these shares are alternatives rather than a stack, and adding them all up would give a figure nobody pays.
What can change the tax you pay in Seneca, IL
- ZIP codes shared with a neighbour. 3 of Seneca's 3 ZIP codes are also reached by Seneca, Channahon, Lisbon and Marseilles and 2 other places, so an address in one of them can owe a neighbour's rate instead of Seneca's.
- Your exact address. Grundy County and Kendall County cover only part of this area, so an address inside them is taxed differently from one just outside. A ZIP code is a postal delivery route and was never drawn to follow tax boundaries.
- What you are buying. Categories are not taxed alike. The calculator switches between general merchandise, prepared food and lodging, which are the categories we hold rates for here.
How Seneca compares with the rest of Illinois
Seneca's ~8.25% is above what most ZIP codes carry in Illinois. Of the state's 1,568 ZIP codes with a figure, 184 land on the same one, 917 carry a lower figure and 467 a higher one. Across Illinois the combined rate runs from 6.25% to 11.25%. See every city in Illinois.
| Combined rate | ZIP codes | Which is this city |
|---|---|---|
| ~7.25% | 343 | |
| ~7.75% | 206 | |
| ~8.25% | 184 | Seneca |
| ~10.5% | 117 | |
| ~6.25% | 104 |
Counted from ZIP-code figures. A tilde marks a band where some ZIP codes cross a tax boundary and are counted at their most likely rate.
How sales tax is collected
The seller generally collects the tax from the buyer at the point of sale and passes it to the authorities that levied it. In most states it is added at the till rather than included in the advertised price. Read how sales tax works, including sourcing rules, online purchases and who is required to collect.
Rates last verified: Sep 6, 2026. This is when the source was last read, not when this page was last edited.
TaxAndTips provides informational estimates from published tax-rate data. Actual tax treatment can depend on the product or service, the exact address, the transaction, exemption status and applicable law. For official obligations, consult the taxing authority or a qualified tax professional.
Why you can rely on these figures
- Published rates
- State and local rates compiled from the tax authorities that levy them.
- Every figure sourced
- See the jurisdiction breakdown and the document each rate came from.
- No signup
- Use the calculator immediately. Nothing to create, nothing to install.
- Missing means missing
- Where a rate is not verified we say so instead of showing a short total.