Oswego Sales Tax Calculator
The combined sales tax rate in Oswego, Illinois is 8.5% in 2026 — a 6.25% Illinois state rate plus 2.25% in local add-ons. That is the 41st lowest rate of the 122 Illinois cities we track, and it runs below Illinois's 8.92% average. On a $100 purchase that's $8.50 in tax for a $108.50 total.
$100.00 total
Before tax: $100.00 · Sales tax: $0.00 (0%)
State & average combined rates: Tax Foundation 2026. Local rates vary by city/county — adjust the rate for an exact figure. How we calculate →
Oswego sales tax rate in 2026
Oswego charges a combined sales tax rate of 8.5%: the Illinois statewide base of 6.25% plus 2.25% in city and county add-ons. Oswego is in Kendall County.
That local add-on is set by Oswego and the taxing districts that overlap it, which is why neighboring cities in Illinois can charge a different total even a few miles apart.
Oswego vs the rest of Illinois
At 8.5%, Oswego runs below Illinois's 8.92% statewide average combined rate by 0.42%. Among the 122 Illinois cities we track by combined rate, Oswego ranks the 41st lowest.
That makes Oswego comparatively light on sales tax for Illinois, though it's still well above zero.
Sales tax examples in Oswego
At Oswego's 8.5% combined rate:
$100 → $8.50 tax, $108.50 total · $1,000 → $85.00 tax, $1,085.00 total · $25,000 car purchase → $2,125 tax, $27,125 total.
Working backwards: a $1,090.00 receipt total in Oswego means the pre-tax price was $1,004.61 and $85.39 was tax — use “Remove tax” mode above to reverse any total instantly.
A note on Oswego's exact rate
The 8.5% rate applies within Oswego's official city limits as published by Illinois DOR — Tax Rate Finder. Addresses with a Oswego mailing address but outside the incorporated city line — a common situation on the edges of any city — can fall under a different, usually lower, rate.
For an address-exact rate, use the official lookup tool: Illinois DOR — Tax Rate Finder. This calculator pre-fills the published city-limits rate as a reliable starting point.
Oswego sales tax — frequently asked questions
What is the sales tax rate in Oswego, Illinois?
Oswego's combined sales tax rate is 8.5% in 2026 — 6.25% Illinois state tax plus 2.25% in local add-ons. That's the 41st lowest rate of the 122 Illinois cities we track.
How much is sales tax on $100 in Oswego?
At Oswego's 8.5% rate, sales tax on a $100 purchase is $8.50, for a $108.50 total.
How much sales tax will I pay on a $25,000 car in Oswego?
At Oswego's 8.5% combined rate, sales tax on a $25,000 vehicle purchase is about $2,125, for a $27,125 total before any trade-in credit or registration fees.
Is Oswego's sales tax higher or lower than the Illinois average?
Oswego runs below Illinois's 8.92% statewide average by 0.42%, ranking the 41st lowest of the 122 Illinois cities we track.
How do I calculate sales tax backwards from a total in Oswego?
Divide the total by 1 plus the rate. A $1,090.00 total in Oswego works back to a $1,004.61 pre-tax price and $85.39 of tax. Use “Remove tax” mode above to do this automatically.
Does Oswego's sales tax rate apply everywhere in the Oswego area?
The 8.5% rate applies within Oswego's official city limits. Nearby addresses outside the incorporated boundary can be taxed at a different rate — check Illinois DOR — Tax Rate Finder for an address-exact figure.
Compare nearby cities in Illinois
See all 122 Illinois cities ranked by combined sales tax rate, or compare:
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →