Delaware Property Tax Guide: Pay, Search, Due Dates & Exemptions
Delaware property tax is handled mainly at the county level. New Castle County, Kent County and Sussex County each have their own property search, tax billing, payment, assessment, credit and appeal routes.
This guide shows how to find your bill, pay safely, understand due dates, check senior and disabled veteran school tax credits, review reassessment issues, handle mortgage escrow, and appeal an assessment when the value or property record looks wrong.
Quick Answer: How Delaware Property Tax Works
To find or pay a Delaware property tax bill, start with the county where the property is located. New Castle County, Kent County and Sussex County each maintain separate official tax and property record systems.
If the problem is the bill balance, payment status, receipt, mortgage payment or penalty, use the county tax office or finance office. If the problem is assessed value, parcel details, exemption eligibility or an appeal, use the county assessment office or Board of Assessment Review route.
Fast Route: Choose the Right Delaware Property Tax Office
Use this table before opening a portal. It helps you avoid contacting the tax collector for an assessment problem or the assessor for a payment receipt.
| Your Need | Start Here | Why | Next Step |
|---|---|---|---|
| Search property tax bill | County tax/property portal | Bills and balances are county-specific. | Use county parcel, tax account or real estate tax search. |
| Pay property tax | County tax office or online payment portal | Payments are accepted by the county billing authority. | Confirm parcel, tax year and amount before paying. |
| Print receipt or check status | County tax office / payment history | Receipts and payment posting are collection records. | Search parcel or account and open payment history. |
| Assessment value looks wrong | County assessment office | Tax office cannot lower assessed value. | Check property record, evidence and appeal route. |
| Senior school tax credit | County tax/assessment office and Delaware Finance | The state program is applied through county administration. | Check age, residency, primary residence and April 30 deadline. |
| Municipal tax bill | City or town tax office | Some Delaware municipalities bill separately from county tax. | Contact the city or town listed on the bill. |
Official Delaware County Property Tax Portals
Delaware does not use one single statewide property tax bill search. Start with the correct county, then use parcel number, tax account number, address or owner name based on that county’s system.
| County | Best For | Search / Payment Route | Watch Out For |
|---|---|---|---|
| New Castle County | County property tax, school tax, parcel search, payment history, online payment and tax/sewer billing. | NCC Online Tax, Sewer and Payments | Reassessment years may have revised billing schedules or special notices. Check the current bill. |
| Kent County | Property records, tax accounts, county/school/library/ditch tax bills, sewer fees and payment status. | Kent County Tax Account Search | If a mortgage company pays the tax bill, online payment processing may not show the same route. |
| Sussex County | Real estate property tax bills, parcel ID search, zoning/sales/owner information and payoff questions. | Sussex County Real Estate Taxes | For past-due accounts, not every charge may show online; contact Sussex County for payoff. |
Search tip: Parcel ID and tax account formats differ by county. If an address search fails, remove apartment details, try only the street name, or use the parcel number printed on the tax bill or deed record.
How to Search a Delaware Property Tax Bill
Before paying, confirm that the parcel is correct. Many errors happen when users select the wrong property with a similar address, old owner name or incomplete parcel number.
Look at the tax year, county, school district, parcel ID, owner name, property address, billing address, amount due, payment history and any sewer, library, ditch, streetlight or local charges included on the bill.
- Identify the county where the property is located.
- Open that county’s official property tax or parcel search page.
- Search by parcel ID, tax account, owner name or address.
- Confirm tax year, property address and owner information.
- Open payment history before paying to avoid duplicate payment.
- Download or print the bill for your records.
How to Pay Delaware Property Tax Safely
Pay only through the official county payment portal, county office, county lockbox address, county phone payment system or another route shown on your tax bill. Avoid search ads or third-party pages that are not linked from the county website.
If your mortgage company pays the bill from escrow, you should still verify the payment posted. New Castle County specifically warns that property owners remain responsible for making sure tax bills are paid even when a mortgage company or bank handles payment.
| Payment Method | What to Check | Best Use | Risk |
|---|---|---|---|
| Online ACH / e-check | Routing number, account number, parcel and confirmation. | Often lower fee than card payment. | Wrong bank details can cause failed or late payment. |
| Credit or debit card | Processing fee, county, parcel and total charge. | Useful when card payment is needed. | Convenience fees may be added. |
| Payment stub, parcel number, correct lockbox and postmark. | Good when mailed early with proof. | Late mail or wrong address can trigger penalty. | |
| In person or kiosk | Office hours, accepted methods and cutoff time. | Useful near deadline or for account questions. | Lines, holidays and limited hours. |
| Mortgage escrow | County payment posting and escrow statement. | Common for homeowners with escrowed mortgages. | Owner may still be responsible if lender misses payment. |
- Search the county tax account.
- Confirm the parcel number and tax year.
- Review county, school and any local charges.
- Choose payment method and review fees.
- Submit payment only after details are correct.
- Save confirmation and later verify payment posted.
Delaware Property Tax Due Dates and Billing Timing
Delaware county property tax deadlines are commonly built around the annual county/school tax bill. September 30 is the most important normal deadline to check, but your exact due date depends on county, tax year, supplemental bill, municipal bill and official notice.
Do not rely only on last year’s date during reassessment or revised-bill years. Always use the printed bill, county tax page and current county notice for final timing.
| Bill / County | Normal Timing | What to Do |
|---|---|---|
| New Castle County annual county and school tax | Normally mailed in July and normally due September 30. Some years may have revised due dates because of reassessment or billing changes. | Use Parcel Search and current NCC tax information page for account-specific date. |
| Kent County annual property tax | Kent County says the full annual tax payment is due September 30. | Use Kent County Tax Account Search and Tax Office contact for supplemental/corrective bills. |
| Sussex County annual property tax | Sussex County annual property tax bills are commonly due by September 30. | Use Sussex County self-service and contact Finance for past-due payoff. |
| Supplemental or corrective bills | Due date may differ from the annual bill. | Use the date printed on the supplemental or corrected bill. |
| Municipal property tax | Cities and towns may bill separately with different due dates. | Contact the municipality listed on the tax bill. |
Deadline warning: Penalties and interest can apply after the due date. In Kent and Sussex, Delaware Code references a 1.5% monthly penalty after September 30 for county taxes; New Castle County has its own year-specific penalty language on county tax pages.
How Delaware Property Tax Amount Is Calculated
Delaware property tax amount usually starts with the county assessment and the tax rates that apply to the property location. County, school, library, ditch, sewer, streetlight, municipal or other local charges can affect the final bill.
The tax bill amount is not always the best way to compare assessment fairness. Kent County notes that tax bills can vary because of school district tax rates, user fees, capitation taxes, exemptions and credits.
Tax amount = taxable assessment × applicable county/school/local rates, plus any direct charges, fees, credits, penalties or supplemental adjustments shown on the bill.
| Bill Part | What It Means | Who to Contact |
|---|---|---|
| Assessment / taxable value | County value used to calculate property taxes. | County assessment office. |
| County tax | County government portion of the bill. | County tax office or finance office. |
| School tax | School district portion, often a major part of Delaware bills. | County tax office for billing; school district for rate questions when listed. |
| Library, ditch, sewer or local charges | Additional district or service charges. | Agency or county department listed on bill. |
| Credits and exemptions | Senior, disabled veteran, local elderly/disability, charitable or other approved reductions. | County assessment/tax office or Delaware Department of Finance program page. |
Delaware Property Tax Credits, Exemptions and Relief Programs
Delaware has state school property tax credits and county-level exemption programs. Eligibility, deadlines and forms depend on the program and county.
The two most searched statewide programs are the Senior School Property Tax Relief Credit and the Disabled Veterans School Tax Credit. Both are connected to school property tax and primary residence rules.
| Program | Who It May Help | Benefit | Deadline / Warning |
|---|---|---|---|
| Senior School Property Tax Relief | Homeowners age 65 or over using the property as a primary residence and meeting Delaware domicile rules. | Credit against regular school property taxes of 50%, up to $500. | Application deadline is April 30. Bill must be paid in full by the end of the tax year to qualify for the next year. |
| Disabled Veterans School Tax Credit | Qualified disabled veterans with 100% service-connected permanent and total disability or individual unemployability, plus Delaware domicile requirements. | May credit 100% of non-vocational school district property tax on a primary residence. | Application deadline is April 30. Cannot claim both Disabled Veterans School Tax Credit and Senior School Property Tax Credit. |
| New Castle County over-65 / disability exemption | Eligible county residents who meet local age, disability and income rules. | May reduce county property tax liability. | New Castle County important dates list June 1 for county over-65/disability exemption forms. |
| Kent County elderly / disability exemption | Eligible Kent County residents age 65+ or totally disabled, based on county rules. | May reduce or eliminate taxable assessment liability. | Use Kent County Finance/Assessment forms and current income documentation. |
| Charitable, religious, educational or parkland exemptions | Qualifying exempt organizations or property uses. | May reduce or remove tax liability if approved. | Use the county-specific exemption application route. |
- Confirm the county where the property is located.
- Check whether the property is your primary residence.
- Gather ID, domicile, age, disability, veteran or ownership documents.
- Use the correct county application route.
- Submit before the listed deadline.
- Verify the credit appears on the bill before the payment deadline.
Senior and Veteran Credit Mistakes to Avoid
Many property owners lose time because they assume a credit applies automatically. Most programs require a county application, deadline compliance and correct documentation.
Senior School and Disabled Veterans School Tax Credit applications use an April 30 deadline for the upcoming tax year.
Delaware Finance says individuals may not claim both the Disabled Veterans School Tax Credit and the Senior School Property Tax Credit.
For the senior credit, Delaware Finance says the property tax bill must be paid in full by the end of the tax year to qualify for the subsequent year.
Newer Delaware residents may face 3-year or 10-year domicile rules depending on when they established legal domicile.
Reassessment, New Value and Why Your Bill Changed
Delaware reassessment activity has made many owners look more closely at property values. A higher tax bill may come from a new assessment, a school rate change, county rate change, loss of credit, new direct charge, corrected property record or supplemental billing.
If your property value changed, compare the county property record to the real property. Check building size, land size, use class, finished area, condition, outbuildings, mobile home status, farmland status and any incorrect classification.
| Reason Bill Changed | What to Check | Who Handles It |
|---|---|---|
| Countywide reassessment | New assessed value, effective tax year and county appeal instructions. | County assessment office / Board of Assessment Review. |
| School or county rate change | Tax rate chart, school district and county rate line. | County tax office and relevant taxing body. |
| Property change | New construction, demolition, renovation, mobile home or land-use change. | Assessment office. |
| Credit/exemption missing | Senior, disabled veteran, local exemption or nonprofit exemption line. | Assessment/tax office and state credit program route. |
| Supplemental or corrective billing | Bill type, tax year, reason for correction and printed due date. | County tax office and assessment office. |
How to Appeal a Delaware Property Assessment
An appeal is for the assessment or property record, not simply the fact that the tax bill is hard to pay. Build the case around market value, equity, incorrect property details, wrong classification, exemption denial or a specific assessment error.
Appeal procedures are county-specific. New Castle County uses its Board of Assessment Review route; Kent and Sussex have assessment review procedures as well. If a supplemental assessment notice is issued, the appeal window may be shorter than the regular annual appeal process.
| Appeal Issue | Useful Evidence | Common Weak Argument |
|---|---|---|
| Value too high | Recent sales, appraisal, comparable properties, photos and condition proof. | “My taxes are too high” without value evidence. |
| Wrong property record | Survey, building plans, permits, photos, deed and county record correction proof. | Calling the tax office but not filing correction/appeal documents. |
| Wrong classification | Use, occupancy, rental/commercial/residential documents and county classification policy. | Assuming the county will correct it automatically. |
| Exemption or credit missing | ID, age, domicile, disability, veteran, nonprofit or primary residence documentation. | Waiting until after the payment deadline to ask. |
| Supplemental assessment | Notice date, construction records, closing documents, photos and corrected property facts. | Ignoring the shorter printed appeal deadline. |
- Read the county assessment notice or property record.
- Identify the exact issue: value, facts, classification or exemption.
- Collect sales, appraisal, photos, property record proof and documents.
- Use the county’s official appeal form or online route.
- Submit before the county deadline.
- Pay the tax bill on time unless official instructions say otherwise.
Late Payment, Penalties and Delinquent Property Tax
If you miss the county due date, penalties or interest can apply. The exact charge depends on the county, tax line item and current tax-year rules.
Do not wait for a reminder if a bill does not arrive. County systems usually let you search the parcel, download a bill, check payment status and confirm whether a mortgage company paid.
September 30 is the key normal date for many Delaware county property tax bills, but your bill controls final timing.
Use the correct lockbox or county address, include parcel number and avoid postdated checks.
Save confirmation and later check whether payment posted to the county account.
If your mortgage company pays, verify county payment status before the deadline.
Delinquency warning: Long-term unpaid property tax can create serious collection risk. Contact the county tax office quickly if the account is past due or if you need payoff information.
New Delaware Homeowner Checklist
New owners should not assume the previous owner’s bill, exemption or escrow setup is correct for the next tax year. Verify the parcel, billing address, assessment, county, school district and municipal tax status soon after closing.
Special Delaware Property Tax Situations
Some property tax questions need extra care because the normal bill-search route may not answer them completely.
Contact your city or town if you receive a separate municipal property tax bill.
County farmland, rollback or preferential assessment forms may have special rules.
Educational, religious, charitable and parkland exemptions require county approval.
Mobile home certification, classification and billing can differ by county and situation.
Update the county billing address so tax notices and appeal notices are not missed.
Keep deed, probate, trust or representative documents ready for county record changes.
Documents to Keep Before Paying or Appealing
Good records help you prove payment, fix mistakes, apply for credits and support an appeal.
Keep annual, supplemental and corrected bills for every tax year.
Use the parcel number for search, payment, appeals and county correspondence.
Save confirmation numbers, receipts, canceled checks and escrow statements.
Keep deed, settlement statement, title documents and transfer records.
Use photos, appraisals, comparable sales and property record corrections.
Keep ID, age, domicile, veteran disability, primary residence or nonprofit proof.
Official Delaware Property Tax Links
Use these official links when you are ready to search a bill, pay, check a county record, apply for a credit or review assessment appeal options.
Related Property Tax Guides on This Site
These internal guides can help users understand property tax basics before using Delaware county payment or assessment systems.
Delaware Property Tax FAQs
How do I pay Delaware property tax?
Use the official county payment portal for the county where the property is located: New Castle County, Kent County or Sussex County. Some municipalities may bill separately.
Is there one statewide Delaware property tax payment website?
No. Delaware property tax billing and payment are county-administered, so use the county portal or payment instructions on your bill.
How do I search a Delaware property tax bill?
Search through the county’s property tax or parcel system using parcel ID, tax account number, address or owner name, depending on the county portal.
When are Delaware property taxes due?
County and school property taxes are commonly due September 30, but exact due dates can vary by county, tax year, supplemental bill or municipality. Always check the bill.
When are New Castle County property taxes due?
New Castle County says county property and local school taxes are normally due September 30, but some reassessment years may have revised due dates. Check the current county notice and parcel account.
When are Kent County property taxes due?
Kent County says the full annual property tax payment is due September 30. Supplemental or corrective bill dates should be checked with the Tax Office.
When are Sussex County property taxes due?
Sussex County annual county property tax bills are commonly due by September 30. For past-due accounts or payoff questions, contact Sussex County directly.
Who handles Delaware property tax assessments?
County assessment offices handle assessed value, parcel details, exemptions and assessment appeals. Tax offices handle billing, payments and receipts.
How is Delaware property tax calculated?
The bill is generally based on taxable assessment multiplied by applicable county, school and local rates, plus direct charges, fees, credits, penalties or supplemental adjustments.
Why did my Delaware property tax bill increase?
Possible reasons include reassessment, rate changes, school tax changes, lost credits, corrected property records, new construction, supplemental billing or municipal charges.
What is the Delaware Senior School Property Tax Credit?
It is a credit for eligible homeowners age 65 or over against regular school property taxes on a primary residence. The credit is 50% of regular school taxes up to $500.
What is the Delaware senior credit deadline?
The application deadline is April 30. Delaware Finance also says the property tax bill must be paid in full by the end of the tax year to qualify for the credit in the next year.
What is the Delaware Disabled Veterans School Tax Credit?
Qualified disabled veterans may be eligible for a credit against 100% of non-vocational school district property tax on a primary residence, subject to program rules.
Can I claim both the senior and disabled veterans school tax credits?
No. Delaware Finance says individuals may not claim both the Disabled Veterans School Tax Credit and the Senior School Property Tax Credit.
How do I appeal a Delaware property assessment?
Use the county assessment office or Board of Assessment Review process. Prepare evidence such as comparable sales, appraisal, photos, property record corrections or exemption documentation.
Should I pay while an assessment appeal is pending?
Generally, pay on time unless official county instructions say otherwise. An appeal does not automatically stop penalties or collection risk.
What if my mortgage company pays my property taxes?
Still verify the county account shows the payment posted. The owner can remain responsible if the lender or bank does not pay correctly.
Do Delaware cities and towns bill separate property tax?
Some municipalities bill separately from county and school taxes. If you receive a city or town tax bill, contact that municipality for search, payment and due-date details.
What records should I keep after paying?
Keep the tax bill, parcel ID, confirmation number, receipt, canceled check, escrow statement and any county correspondence.
Is CountyPropertyTaxes.us an official government website?
No. This is an independent informational guide. Use official Delaware county and state websites for final account-specific actions.
Bottom Line
For Delaware property tax, start with the county where the property is located. Search the parcel, confirm the bill, pay before the due date, check senior or disabled veteran credits, and use the county assessment appeal route if the value or property record is wrong.
Find County PortalPay SafelyDue DatesCreditsAppeal HelpOfficial Links