Property Taxes When Buying a Home — Prorations, Escrow, and Closing Costs

Somewhere in the middle of every closing package sits a set of property tax entries that confuse almost every first-time buyer: a proration credit, an escrow deposit, and sometimes a note about a supplemental bill still to come. None of these numbers are optional or negotiable line items your agent added — they are standard mechanics of how property taxes are split and prepaid whenever a home changes hands. Understanding them before you sign prevents an unpleasant surprise at the closing table and, more importantly, months later when your real tax bill arrives.

Proration explained: splitting the year's taxes between buyer and seller

Property taxes are billed for a full year, but almost no home sale happens exactly on January 1st or the start of a fiscal tax year. Proration is the mechanism that divides that year's tax bill fairly between the seller, who owned the home for part of the year, and the buyer, who will own it for the remainder. At closing, whichever party has already paid taxes covering time they will not own the home receives a credit, and whichever party has not yet paid for time they will own the home gives a credit the other direction — the net effect is that each party effectively pays only for the days they actually held title.

Arrears versus advance: why proration works differently by state

The mechanics of proration hinge on whether your state bills property taxes in arrears — after the period covered, meaning a bill you receive in December might cover the tax year just ending — or in advance, where you pay before the coverage period begins. In arrears states such as Illinois and Texas, the seller typically owes for the months they owned the home before closing but has not yet been billed, so the seller gives the buyer a credit at closing, and the buyer later pays the full bill covering both periods when it arrives. In advance states, the seller has often already paid for months after closing that they will not own the home, so the buyer instead reimburses the seller for that unused prepaid period. Your title company or closing attorney handles this automatically, but knowing your state's convention helps you sanity-check the numbers on your settlement statement.

A worked closing example

Suppose you are buying a home in an arrears state where the annual tax bill of $6,000 will be issued in December covering the calendar year, and your closing date is July 1st — exactly the midpoint of the year. The seller owned the home for the first six months (181 days) and has not yet paid any tax for that period, since the bill will not arrive until December. At closing, the seller credits you $2,970 (181 days out of 365 at $6,000 per year) toward the tax bill you will eventually pay in full. You, the buyer, effectively receive that credit against your purchase price, and in December you pay the entire $6,000 bill yourself, having already been reimbursed for the seller's share.

Where taxes appear on your Closing Disclosure

On your Closing Disclosure, look in the "Other" section, sometimes labeled "Adjustments for Items Paid by Seller in Advance" or "Adjustments for Items Unpaid by Seller," where prorated county and city property taxes are itemized by date range and dollar amount, credited to either the buyer or seller. Separately, if you have a mortgage, your lender's required initial escrow deposit for property taxes appears further down the form, typically in the "Initial Escrow Payment at Closing" section, listed as a specific number of months of tax reserve. These two entries are related but distinct — the proration settles past and future taxes between buyer and seller, while the escrow deposit funds your lender's cushion for paying future bills on your behalf.

Initial escrow deposit: why you prepay months of taxes at closing

If your mortgage includes an escrow account, which most conventional loans with less than 20% down and nearly all FHA and VA loans require, your lender collects a portion of your annual property tax bill with every monthly payment and pays the county directly when the bill is due. To make sure the account never runs short right after closing, lenders require an initial deposit at closing equal to several months of your projected tax obligation — often two to six months, depending on your closing date relative to the next tax due date. This deposit is not a fee or profit for the lender; it is your own money, held in trust and later applied entirely toward your actual tax bills.

The reassessment warning: the seller's tax bill is not your future bill

This is the single most important thing to understand before closing, and the one most buyers miss. The tax bill you see during your purchase, and the number your lender uses to set your initial escrow deposit, is almost always based on the seller's existing assessed value — which may reflect a purchase price, exemption status, or assessment cap from years earlier. In most states, a sale itself, or the new purchase price recorded at closing, triggers a reassessment that brings the assessed value up to the new, typically much higher, market value. If the seller bought the home a decade ago for $220,000 and you are buying it today for $450,000, your first full tax bill after reassessment can be dramatically higher than the number quoted during your home search, even with no change in tax rate.

Estimating your real bill before you buy

Rather than relying on the seller's current tax bill as a preview of your own, estimate your future taxes using your actual purchase price multiplied by your local effective tax rate — the rate that reflects both the nominal rate and any assessment ratio adjustments in your jurisdiction. Use our calculator to run this estimate with your specific purchase price and state before you finalize an offer, so the number you budget against reflects reality rather than a legacy assessment that is about to disappear. Building the reassessed number into your monthly budget from day one avoids a painful adjustment when your escrow account is recalculated after the first full tax cycle.

Questions to ask before making an offer

Before you commit to a purchase price, ask your agent or the listing agent for the property's current assessed value, whether any exemptions — homestead, senior, veteran, or agricultural — are currently applied and will be lost upon sale, and whether any pending levies, bond measures, or reassessment notices are scheduled that would affect the next tax cycle. A home that looks affordable based on a seller's low, exemption-reduced bill can become considerably less affordable once that exemption disappears with the change in ownership and the assessed value resets closer to your purchase price.

New construction: the land-only assessment jump

Buyers of new construction face a related but distinct trap. Early in a development's life, or if you buy a home the moment it is finished, the property may still be assessed as vacant or partially improved land, producing an artificially low first-year tax bill. Once the county's assessor completes a full inspection and adds the value of the completed structure — sometimes not until the following tax cycle — the assessed value and resulting bill can jump substantially, sometimes doubling or more. Ask your builder or the local assessor's office directly what the fully assessed, completed-home tax bill is projected to be, rather than budgeting off the artificially low bill quoted at move-in.

Due diligence: checking for unpaid taxes and liens

Before closing, your title company runs a title search that should surface any unpaid property taxes or existing tax liens against the property, since unpaid taxes typically create a lien that takes priority over even a mortgage. Confirm that your title commitment explicitly addresses current-year and any prior-year tax status, and make sure your closing instructions require the seller to clear any outstanding balance before or at closing. This protects you from inheriting someone else's unpaid tax debt attached to the property you are about to own.

Sources: Tax Foundation, Lincoln Institute of Land Policy

This guide is for general educational purposes only and is not legal or financial advice. Verify all figures with your local county assessor's office.