Whether you pay property taxes for the previous year or the current year depends on your jurisdiction. Some local governments bill in arrears, collecting taxes for a period that has already ended. Others bill in advance, collecting for the year you’re currently in. A few split the difference through a fiscal year that straddles both. Your tax bill itself will state the period it covers, and your county treasurer or assessor can confirm which system governs your property.
Paying in Arrears: The Previous Year
In an arrears jurisdiction, the bill you pay covers a tax period that has already passed. Your 2025 property taxes, based on the January 1, 2025 assessment, don’t come due until sometime in 2026. The reasoning is administrative: the government needs the full year’s budget figures before it can calculate your exact share, so billing runs behind the calendar.
The practical effect is that you’re always paying yesterday’s bill. That timing lag is what makes the arrears-versus-advance question matter at closing, at tax time, and when your escrow account gets analyzed.
Paying in Advance: The Current Year
In an advance jurisdiction, the bill covers the tax period you’re currently in. A bill issued in early 2026 covers January through December 2026. The government estimates its budget needs, sets the rate, and collects before the year plays out. The taxing authority gets revenue at the start of its fiscal year, and the rate is based on projected rather than final figures.
Fiscal Years That Straddle Both
Some jurisdictions blur the line. A fiscal year running July 1 through June 30, for example, might bill you in November for a period that is partly behind you and partly ahead. In that case the bill is neither fully in arrears nor fully in advance, and the specific dates on your bill are the only reliable guide.
How to Find Out Which System Applies to You
Your tax bill usually states the tax year or period it covers. Read that line carefully. If the bill you received in early 2026 says it covers the 2025 tax year, you’re in an arrears jurisdiction. If it says 2026, you’re paying in advance. When the bill is ambiguous, call your county treasurer’s office or the assessor. This is a routine question they answer daily.
One boundary worth noting: the assessment date and the billing period are not the same thing. Most states use January 1 as the assessment date, meaning that’s when your value is locked in, but the billing cycle that follows can point either backward or forward from there.
Due Date vs. Delinquency Date
Whichever system applies, watch the two dates on the bill. The due date is when the government wants your money. The delinquency date is when penalties start. Some jurisdictions build in a grace period of a few weeks; others treat both dates as identical. Once the delinquency date passes, a flat penalty plus monthly interest typically begins to accrue, and the combined annual cost commonly falls somewhere between 7% and 20%.
Why It Matters When You Buy or Sell
The arrears-or-advance question hits hardest at closing. Buyer and seller split the year’s tax bill based on how many days each owned the home, a calculation called proration, and the direction of the money depends on the system.
In an arrears jurisdiction, the seller lived in the home during the tax period but the bill won’t arrive until after closing. The seller owes the buyer a credit at closing for the seller’s share of the yet-to-be-billed taxes. The buyer will pay the full bill when it eventually comes due but was compensated up front for the seller’s portion. In an advance jurisdiction, the seller may have already prepaid the full year’s taxes. If so, the buyer reimburses the seller at closing for the portion covering the buyer’s period of ownership.
The daily rate used for proration is calculated on either a 365-day actual year or a 360-day banker’s year, depending on local custom and the purchase contract. On a $6,000 annual bill with a July 1 closing, that’s about $16.44 per day under the 365-day method and $16.67 under the 360-day method. The gap is small on modest bills and larger on high-tax properties.
Why It Matters on Your Federal Return
For federal income tax purposes, you deduct property taxes in the year you actually pay them, not the year the taxes cover.1Office of the Law Revision Counsel. 26 USC 164 Taxes If you pay a 2025 arrears bill in February 2026, the deduction lands on your 2026 return. If your mortgage servicer pays through escrow, you deduct only the amount the servicer actually disbursed to the taxing authority during the calendar year, not the total you paid into the escrow account.2Internal Revenue Service. Publication 530 Tax Information for Homeowners
Closing complicates this. Regardless of how local law handles lien dates or how the cash moved at the closing table, the IRS treats the seller as paying property taxes through the day before the sale date and the buyer as paying from the sale date forward.2Internal Revenue Service. Publication 530 Tax Information for Homeowners That federal allocation controls who gets the deduction, even when the settlement statement did the split differently.
One trap for buyers: if you agree to pay the seller’s delinquent taxes as part of the purchase, you cannot deduct them. The IRS treats delinquent taxes assumed at purchase as part of the cost of the home, added to your basis rather than claimed as a tax payment.2Internal Revenue Service. Publication 530 Tax Information for Homeowners
For 2026, the federal deduction for state and local taxes, including property taxes, is capped at $40,400 for most filers and $20,200 for married filing separately.1Office of the Law Revision Counsel. 26 USC 164 Taxes The deduction benefit begins to phase out once modified adjusted gross income exceeds $500,000 and cannot be reduced below $10,000.3Internal Revenue Service. Topic No. 503 Deductible Taxes You have to itemize on Schedule A to claim it.
Why It Matters for Your Escrow Account
Most homeowners with a mortgage don’t send checks to the county themselves. The servicer collects roughly one-twelfth of the estimated annual bill each month, holds it in escrow, and pays the taxing authority when the bill comes due.
Federal regulations require your servicer to analyze the escrow account at least once a year to check whether the balance will cover upcoming disbursements. The servicer is allowed to maintain a cushion of up to one-sixth of the total annual escrow disbursements.4eCFR. 12 CFR 1024.17 Escrow Accounts When the analysis reveals a shortage, usually because your assessment went up, your monthly payment climbs.
Federal rules limit how the servicer collects the shortfall. If the shortage is less than one month’s escrow payment, the servicer can require repayment within 30 days or spread it over at least 12 months. If the shortage equals or exceeds one month’s payment, the servicer must spread the repayment over at least 12 months.4eCFR. 12 CFR 1024.17 Escrow Accounts You can always pay the shortage in a lump sum to keep the monthly payment steady. One thing escrow generally doesn’t cover: supplemental or corrected tax bills that arrive outside the normal cycle are typically your responsibility to pay separately.