Property Tax Proration at Closing, Explained

The core idea

Property taxes are billed for a fixed period — usually a calendar year, sometimes a fiscal year, sometimes in two semi-annual installments. If you sell partway through that period, you and the buyer have each owned the home for part of it. Proration just splits the bill in proportion to how many days each party owned the property during the taxing period.

On the closing statement you'll see one of two things: a credit to the buyer (you owe them money) or a credit to the seller (they owe you). Which one shows up depends entirely on whether the tax bill for the current period has already been paid.

Paid-in-arrears vs. paid-in-advance states

This is the single biggest source of confusion. States and counties fall into two camps:

• Paid in arrears. You pay this year's tax bill at the end of the year (or early the next year). When you sell mid-year, the tax for the months you've already lived there hasn't been paid yet. You credit the buyer for those days because they'll eventually receive the bill that covers your ownership period. Most of the country works this way.
• Paid in advance. You pay the full year's bill up front, at the start of the period. When you sell mid-year, the buyer reimburses you for the days they'll own the home during the prepaid period. Less common, but standard in some jurisdictions.

Title companies handle the lookup, but if you want to sanity-check the proration, the first question is always: "Has the current period's bill been paid yet?"

The math, step by step

Here's a worked example. Assume:

• Annual property tax bill: $6,000
• Tax period: calendar year (January 1 – December 31)
• Closing date: September 15
• State: paid in arrears (this year's bill not yet paid)

Steps:

1. Daily tax = $6,000 ÷ 365 = $16.44 per day.
2. Seller's ownership days this period = Jan 1 – Sep 14 = 257 days.
3. Seller's share = 257 × $16.44 = $4,225.
4. Closing statement: $4,225 credit to the buyer (the seller's proceeds are reduced by that amount; the buyer's cash to close is reduced by that amount).

If the same closing happened in a paid-in-advance jurisdiction where you'd already paid the full $6,000 in January, the credit would flow the other way: the buyer would owe you for Sep 15 – Dec 31 (108 days × $16.44 = $1,776).

Where the surprises come from

• Reassessment after closing. Many counties reassess properties when they change hands. The proration uses the most recent known bill, but the buyer's actual bill may be higher. That's a future-bill issue, not a closing issue, but buyers sometimes ask for a "true-up" clause anyway.
• Exemptions you held that the buyer won't. Homestead, senior, or veteran exemptions usually drop off when the home transfers. The proration uses your current, exempt bill — but again, the buyer's eventual bill will be larger.
• Mid-cycle installment due dates. If a tax installment is due within 30-60 days of closing, the title company may collect it from you at closing and pay it directly, rather than prorate. Read the line item carefully — it can look like a duplicate charge but isn't.
• 365 vs. 360 day year. Some title companies divide annual tax by 360, treating each month as 30 days. The difference on a $6,000 bill is about $5 a month. Small, but worth knowing when reconciling.

How proration shows up in your net proceeds

Property tax proration is one of several line items that move your bottom-line proceeds and that you can estimate before closing. Plug an estimate into our home seller net proceeds calculator — the calculator factors in customary closing costs and helps you see how proration and other adjustments interact with commission, transfer taxes, and your mortgage payoff. If you're in a high-tax state, try the Illinois calculator or the New Jersey calculator — paid-in-arrears states where proration credits to the buyer can run into five figures on big-bill properties.

What to ask your title company

• Is this jurisdiction paid in arrears or in advance?
• What annual bill are you using for the proration, and what tax year?
• Is the proration 365-day or 360-day?
• Are there any installments due within 30 days that you'll collect at closing?
• Will any of my current exemptions affect the bill the buyer eventually receives?

The bottom line

Property tax proration isn't an extra fee. It's a settlement between you and the buyer to make sure each of you pays tax only for the days you actually owned the home. It can be a meaningful debit on your side — sometimes thousands of dollars on high-bill properties — but it's also predictable. Once you know whether your jurisdiction bills in arrears or in advance, you can estimate the credit to the dollar from your most recent tax bill and the planned closing date.