Kendall County Property Tax: Pay Online, Look Up Bills, Check Due Dates & Avoid Late Penalties
Use this Kendall County property tax guide to find your bill by PIN, pay online through the official E-Pay route, understand why one bill covers both installments, check the 2026 due dates, avoid 1.5% monthly penalties, know who to call for assessment or tax-rate questions, and handle exemptions, address changes, delinquent notices and appeal next steps.
Kendall County property tax quick answer: what should you do first?
Most Kendall County tax problems start when the taxpayer calls the wrong office. Use the tax inquiry for bills and payment status, the Collector for billing/payment, the Supervisor of Assessments for value/exemptions, and the County Clerk for rates and levies.
Fast action board
- 1Need the bill or balance? Use the official Property Tax Inquiry and search by PIN or other criteria.
- 2Need to pay online? Use Kendall County E-Pay / InvoiceCloud. Have your PIN number and payment amount from the tax bill ready.
- 3Only got one bill? That is normal. Kendall County says one bill is issued for the full year and is payable in two equal installments.
- 4Did not receive a bill? Call the Collector at 630-553-4124. Failure to receive a bill does not remove tax liability or late penalties.
- 5Disagree with value or exemption? Contact the Township Assessor first, then Kendall County Supervisor of Assessments at 630-553-4146.
Official live-task links
| User Need | Correct Office | Best Next Step |
|---|---|---|
| Tax bill, payment, duplicate bill | Kendall County Collector | Call 630-553-4124 or use Property Tax Inquiry. |
| Assessment, property description, multiplier, exemption | Supervisor of Assessments | Call 630-553-4146 and review assessment/exemption pages. |
| Tax rate or levy question | Kendall County Clerk | Call 630-553-4104 and ask about rates or levies. |
| How assessment was determined | Township Assessor | Use the phone number printed on the back of the tax bill. |
| Senior tax deferral | Treasurer | Ask the Treasurer’s office about real estate tax deferral assistance. |
How to look up Kendall County property tax bills by PIN
Use the county’s official property tax inquiry before paying. It helps verify the parcel, tax year, paid/unpaid status, installment amount and payment posting.
1
Open the official tax inquiryBest for bill search and payment verification.
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Open Kendall County Property Tax Inquiry. Search by PIN or other available property criteria. The PIN is the safest field if you have the bill in hand.
2
Verify the parcel before paymentWrong-parcel payments are a serious problem.
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Compare PIN, owner, property address, tax year, installment amount and payment status. Kendall County warns that payments made on the wrong parcel cannot be refunded automatically, so do not skip this step.
3
If no bill arrived, request a duplicateNo bill does not cancel the tax.
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If your May bill does not arrive, call the Kendall County Collector at 630-553-4124. Property owners can request a duplicate bill at no cost; non-owners may be charged a duplicate bill fee.
How to pay Kendall County property taxes online, by phone, mail, bank or in person
Kendall County accepts several payment routes. The safest route depends on how close you are to the due date, whether you need card/e-check payment, and whether the tax sale window is near.
Online
Use E-Pay / InvoiceCloud with your PIN and payment amount. Online payment is available during the county’s listed collection window.
Phone
Call the payment line listed by the county and follow prompts. Card convenience fees apply, and the IVR service may have its own fee.
Mail / in person
Mail or bring payment to Kendall County Collector, 504 S. Main Street, Yorkville, IL 60560. Include the correct coupon and PIN.
| Payment Method | Official Practical Detail | What to Do |
|---|---|---|
| Online E-Pay | Use MasterCard, Discover, Visa or American Express; convenience fee applies and is not collected by the county | Have PIN and exact payment amount ready. |
| E-check / ACH | Electronic check route may be available with a transaction fee | Enter routing/account numbers carefully; returned payments can trigger fees. |
| Phone | County lists phone payment with card through an automated system | Save confirmation and review card fee before completion. |
| Postmark must be on or before due date to avoid late penalty | Mail early; include coupon and write PIN on the check. | |
| Bank payment | Most Kendall County banks may accept tax payments on or before due date, but policies vary | Bring the entire bill and confirm the bank still accepts tax payments. |
| In person / drop box | Office and drop box are at 504 S. Main St., Yorkville | After October 1, accepted payment types may be limited. |
1
Use the exact installment amountEstimated or partial payments may not be accepted.
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Kendall County’s payment instructions say estimated payments or partial payments will not be accepted. Pay the exact installment amount shown on the tax bill, or the entire bill amount if paying both installments together.
2
Do not mail the whole billUse the correct payment coupon.
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For mailed payments, send the payment coupon for the installment being paid, include the PIN on your check, and do not staple, paperclip or tape the check or coupon. Never mail cash.
3
Save proof and check postingYour canceled check can act as receipt.
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After paying, save the confirmation or canceled check. Then verify the county received and posted the payment by using the Property Tax Inquiry and searching by PIN or other criteria.
Kendall County property tax due dates and late penalty schedule
Kendall County property taxes are billed once but paid in two equal installments. No second bill is mailed before the second installment.
| 2026 Tax Date / Period | First Installment | Second Installment | What It Means |
|---|---|---|---|
| By June 9 | 0% | 0% | First installment due; pay on time to avoid penalty. |
| June 10 – July 9 | 1.5% | 0% | First installment is late. |
| July 10 – Aug. 9 | 3.0% | 0% | First installment penalty increases. |
| Aug. 10 – Sept. 9 | 4.5% | 0% | Second installment still due by Sept. 9. |
| Sept. 10 – Oct. 9 | 6.0% | 1.5% | Second installment becomes late. |
| Oct. 10 – Oct. 23 | 7.5% | 3.0% | Penalty grows as tax sale approaches. |
| After Sept. 30 | Limited payment forms | Limited payment forms | County may accept only cash, cashier’s check, money order or certified check during this period. |
One bill, two installments
Kendall County taxpayers do not receive a second bill when the second installment is due. Put the second due date on your calendar when the May bill arrives.
Tax sale risk
Delinquent taxes can lead to notice fees and annual tax sale activity. The 2026 due-date notice lists the tax sale date as October 26.
Assessment, exemptions and appeals: who to call before you protest the wrong thing
The Treasurer/Collector collects tax. The assessment system determines taxable value. The Clerk handles rates and levies. To lower a future bill, you usually need to fix assessment data or exemptions before collection deadlines.
Township Assessor
Start here if you need an explanation of how your assessment was determined. The township assessor’s phone number is listed on the back of the tax bill.
Supervisor of Assessments
Call 630-553-4146 for assessment, property description, multiplier and exemption questions.
County Clerk
Call 630-553-4104 for tax rate and tax levy questions. The Clerk does not correct property characteristics.
| Question | Best Office | Practical Next Step |
|---|---|---|
| “My square footage is wrong.” | Township Assessor / Supervisor of Assessments | Gather property record, photos, sketch or appraisal proof. |
| “My senior exemption is missing.” | Supervisor of Assessments | Call 630-553-4146 and ask which exemption form is required. |
| “The tax rate is high.” | County Clerk / taxing district | Ask about tax levy and rate, not parcel value. |
| “I want to appeal the assessment.” | Board of Review process | Watch township publication/complaint deadlines and submit evidence. |
| “I need senior tax deferral.” | Treasurer | Ask the Treasurer’s office about Real Estate Tax Deferral assistance. |
1
Check exemptions before payingDo not assume every exemption applied automatically.
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Review your bill and assessment record for homestead, senior, disabled person, disabled veteran or other relief. Kendall County’s exemption page explains several tax relief and incentive programs and directs applicants to the Assessment Office.
2
Use value evidence, not only tax amountAppeals focus on assessment accuracy.
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Useful evidence includes comparable sales, recent appraisal, incorrect property characteristics, photos, repair estimates, condition issues, wrong class or assessment inequity compared with similar properties.
3
Do not wait for collection season to appeal valueTax-payment deadlines and assessment-appeal deadlines are different.
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Paying a bill and appealing an assessment are separate workflows. If taxes are due, missing the payment deadline can add penalties even while you are questioning the value.
Looking for Kendall County, Texas property taxes instead?
This page is built around Kendall County, Illinois because that is the primary official “Kendall County property tax” result and uses the Kendall County Collector/Treasurer system. If your property is in Boerne, Comfort or Kendall County, Texas, use the Texas appraisal district and county tax-office routing instead.
Kendall County, TX property-tax routing
Kendall County, Texas says property taxes are assessed and collected by the Kendall Appraisal District. The Texas Comptroller directory also notes the county tax assessor does not collect property taxes and directs users to the appraisal district.
Kendall County Treasurer / Collector contact information
Use the Treasurer / Collector for tax billing and payment. Use Assessment for value, property description and exemptions.
Treasurer / Collector
Kendall County Treasurer / Collector
504 S. Main Street
Yorkville, IL 60560
Phone: 630-553-4124
Hours: Monday–Friday, 8:00 a.m.–4:30 p.m.
Assessment / rates routing
Supervisor of Assessments: 630-553-4146
County Clerk rates/levies: 630-553-4104
Use the township assessor listed on your bill for a direct explanation of how your property assessment was determined.
Map to Kendall County Treasurer / Collector
Bring the full tax bill if paying at the office. For mail payment, send the correct coupon and write the PIN on the check.
Official Kendall County property tax resources
Use these for live tasks. The key facts and micro-steps are summarized above so users only leave to search, pay, download a form or verify current status.
Kendall County property tax FAQs
Short answers for taxpayers who want to look up, pay, understand, appeal or fix a Kendall County property tax issue without reading multiple county pages.
QHow do I pay Kendall County property tax online?▾
Use Kendall County E-Pay / InvoiceCloud from the Treasurer’s official payment page. You need your PIN number and payment amount from the tax bill. Verify the parcel first in the Property Tax Inquiry.
QWhen are 2026 Kendall County property taxes due?▾
For 2025 taxes payable in 2026, the first installment is due June 9, 2026 and the second installment is due September 9, 2026.
QWill I receive a second bill for the second installment?▾
No. Kendall County says only one bill is issued for the full year and taxpayers do not receive a second bill when the second installment is due.
QWhat happens if I miss the due date?▾
Unpaid installments add interest at 1.5% per month until paid. Delinquent balances after the second installment may also receive a delinquent notice fee.
QWho do I call for tax billing or payment?▾
Call the Kendall County Collector at 630-553-4124 for tax bill, payment, duplicate bill and payment posting questions.
QWho handles exemptions?▾
Call the Kendall County Supervisor of Assessments at 630-553-4146 for exemptions, property description, assessment and multiplier questions.
QWho handles tax rates and levies?▾
Kendall County directs tax rate and levy questions to the County Clerk at 630-553-4104.
QWhere do I mail Kendall County property tax payment?▾
Mail payments to Kendall County Collector, 504 S. Main Street, Yorkville, IL 60560. Include the correct coupon and write the parcel/PIN on your check. Do not mail cash.
QCan I pay at a bank?▾
Kendall County says most banks in the county may accept payments on or before the due date, but acceptance after the first installment due date is at the bank’s discretion and banks cannot accept payments after the second due date.
QIs PropertyTaxUSA.org official?▾
No. PropertyTaxUSA.org is an independent guide. Always verify tax balances, due dates, payment status, fees, penalties, exemptions and appeal rules with Kendall County official sources.
Bottom line
For Kendall County property tax, think: search by PIN → verify parcel and installment → pay the exact amount → save proof → contact the correct office if something is wrong. The Collector handles billing and payment. The Supervisor of Assessments handles assessment and exemptions. The County Clerk handles rates and levies. The township assessor explains how your assessment was determined.
Independent guide notice: This page is not Kendall County, the Kendall County Treasurer, a tax collector, a payment processor or legal advice. Official county sources control current balances, due dates, fees, penalties, exemptions, appeal deadlines, tax sale notices and payment status.