Property tax proration at closing: how it works

Last updated 2026-07-10

What is property tax proration and why does it appear on my closing statement?

Proration makes each party pay only for the days they actually owned the home. When a house sells mid-year, the county still sends one annual tax bill to whoever owns the property on the lien date or billing date. Without proration, the seller would pay taxes for months they no longer own, or the buyer would swallow the whole year.

You'll see it as a line item on your Closing Disclosure, the federal form the Consumer Financial Protection Bureau requires under RESPA ^[1]. It shows up as a credit to the buyer or a debit to the seller, sometimes both, depending on whether taxes have already been paid for that period.

The concept is simple. The execution trips people up.

A lot rides on your state's tax calendar, whether the jurisdiction bills in arrears or in advance, and which day the parties agreed the seller owns the property through. Those details move the final number by hundreds of dollars.

How is the proration amount actually calculated?

The formula has three steps: find the daily tax rate, count the seller's days, multiply. Divide the annual bill by 365 (or 366 in a leap year) for the daily rate. Multiply that rate by the days the seller owned the home. That's the seller's share. The buyer owes the rest.

Step 1: Find the daily rate. Take the annual property tax and divide by 365. An annual bill of $4,380 gives a daily rate of $12.00.

Step 2: Count the seller's days. Count from January 1 of the tax year (or the first day of the billing period, depending on your state) through closing day, or the day before, per your contract. Most contracts spell out which party owns closing day. Check yours.

Step 3: Multiply. Seller's days times the daily rate equals the seller's share.

Example: A home in a calendar-year state closes March 31. Annual tax is $6,000. The daily rate is $6,000 / 365 = $16.44. The seller owned the home 90 days (January 1 through March 31, assuming closing day goes to the buyer). Seller's share = 90 x $16.44 = $1,479.45.

Some states and title companies use a 360-day banker's year with 30-day months instead. That yields a slightly different number. On a $6,000 annual bill the gap is about $50, but you want to know which method your closing agent used ^[2].

Assessments often come out after closing. When the current year's tax isn't set yet, the closing agent estimates from the prior year's bill. That estimate can miss, which is why many states put a post-closing reproration clause in the purchase contract.

Method	Days in year	Days in month	Effect on seller's share
Actual/365	365 or 366	Actual	Most precise
30/360 (banker's method)	360	30	Slightly lower daily rate
Actual/360	360	Actual	Highest daily rate

Does it matter whether my state bills property taxes in arrears or in advance?

Yes. This is where most confusion starts. In arrears states, the current year's taxes often aren't paid yet at closing, so the seller gives the buyer a credit for the seller's share. In advance states, taxes may already be paid past the closing date, so the buyer credits the seller back for the overpaid portion.

Most states bill in arrears. The 2025 bill arrives and comes due in 2025 but covers the 2025 tax year (or in some places the 2025 bill covers 2024). Because those taxes haven't been paid at closing, the buyer collects the seller's credit and uses it, plus the buyer's own share, to pay the full bill when it lands ^[3].

A few states bill in advance, meaning what you pay this year covers next year. Texas bills in arrears. In California, supplemental bills often arrive after closing and catch new owners flat-footed ^[4].

The practical test takes thirty seconds. Ask your closing agent to show you two things: which period the proration covers, and whether any installment has already been paid. Those two answers can save you hundreds of dollars in disputes later.

Who pays property taxes at closing: buyer or seller?

Neither pays the county at closing, strictly speaking. Proration is an adjustment between buyer and seller, settled through escrow or title. The county's bill still goes to whoever it shows as owner on the due date.

In practice, the seller's prorated share comes out of their net proceeds at the table. The buyer takes that credit and pays the full tax bill when it's due, using the credit plus the buyer's own share.

If the seller already paid the full year before closing, the buyer instead credits the seller for the portion of the year the buyer will own. That's less common, but it happens often in states with spring due dates.

Your escrow officer or closing attorney handles the accounting. They have to give you the Closing Disclosure at least three business days before closing, so you have time to check the numbers ^[1].

Buying in a high-tax county like Cook County? The in-arrears cycle there means buyers routinely get a credit worth several months of taxes at closing, then face a big bill the next year when the prior year's taxes come due. Knowing this cycle before you close prevents a real budget shock.

What happens when the tax amount for the current year isn't known yet at closing?

The closing agent uses an estimate, almost always the prior year's certified bill, and notes on the Closing Disclosure that the proration rests on that estimate. This is the most common real-world snag. Bills for a given year frequently don't mail until fall, or even the following year.

Many purchase contracts, especially in California, Texas, and Illinois, carry a reproration clause. If the actual bill differs from the estimate by more than a set threshold, usually $100 to $500, the parties agree to true up once the real number arrives ^[4].

No reproration clause, and a bill that comes in 15% over estimate? The buyer eats the difference. Worth negotiating before you sign.

In counties with frequent reassessments, like Santa Clara or LA County, a sale can also trigger a supplemental assessment. Under California's Proposition 13, a change of ownership resets the assessed value to the purchase price ^[4]. The supplemental bill covers the difference between the old and new assessed value for the partial year. It goes to the buyer, it can run several thousand dollars, and it is not part of standard closing proration.

How do I check whether my proration calculation is correct?

Pull three documents and run the math yourself. You need your Closing Disclosure, the tax bill the closing agent used as the basis for the estimate, and your purchase contract (which tells you whose day closing day is and which calculation method the parties agreed to).

Compare your result to the figure on the Closing Disclosure. A few cents is rounding. More than $20 or $30 is worth a phone call to your title company or escrow officer.

Common errors to hunt for:

• Wrong base year: the agent used a bill from two years ago instead of the most recent one.
• Wrong day count: off-by-one errors around closing, especially when contracts say "through" versus "up to" closing day.
• Exemption not backed out: if the seller had a homestead exemption, the bill the agent used was lower than what the buyer will owe once the exemption drops off. The buyer's share should be figured without the exemption.
• Wrong billing period: some counties bill twice a year. If one installment got treated as the annual total, the proration comes out half of what it should be.

Spot an error after closing? Contact your title company in writing. Title companies carry errors and omissions insurance and generally fix genuine calculation mistakes. If they refuse, your state's department of insurance regulates title companies and takes complaints ^[5].

What about homestead exemptions at closing: does the buyer get credit?

The buyer does not inherit the seller's exemption, and that surprises a lot of people. If the seller had a homestead exemption (or a senior, disability, or other reduction), the bill used to figure the proration reflects that discount. The buyer almost certainly won't qualify for the same break on day one.

In many states, homestead exemptions apply only to a property you owned and occupied as of January 1 of the tax year ^[6]. Buy in March, and you won't get the homestead exemption until the next January. Your first full tax bill will run higher than the prorated amount implied.

The fix: ask the listing agent or the seller's attorney for the un-exempted tax figure, sometimes called the gross or full tax amount. Use that number for your proration, or at least budget for the higher bill in your first year.

Counties like Gwinnett County and Montgomery County print both the exempted and the full assessed value on the tax bill, which makes the check easy. Others show only the exempted amount, so you may have to call the assessor's office.

How does proration work in states with non-calendar tax years?

The math stays the same, but the start and end dates shift. Not every state runs January 1 to December 31. Maryland's tax year runs July 1 to June 30, and so does New York City's fiscal year ^[7]. You'd use the first day of the local fiscal year as your baseline instead of January 1.

This matters because a closing agent who defaults to January 1 without checking the local calendar can be off by hundreds of dollars.

Buying in New York City? The NYC property tax system is layered enough that you want to confirm the fiscal year start date with your title company before you accept any proration figure.

Texas runs a calendar tax year, but bills don't arrive until October and aren't due until January 31 of the following year ^[8]. So a June closing leaves the entire current year's taxes unresolved. The seller credits the buyer for roughly six months, the buyer collects, and the buyer pays the full bill in January. Getting the number right there usually means pulling the prior year's bill from the county appraisal district.

Can I dispute or renegotiate the proration amount?

Before closing, yes, freely. Once you have the Closing Disclosure, you get at least three business days to review it ^[1]. If the proration looks off, call your closing agent and walk through the calculation together. Bring your own math. Title companies make errors, and they field these questions all the time.

After closing, it's harder but not hopeless. A reproration clause already covers you for differences between the estimate and the actual bill. For a genuine calculation error, the title company's errors and omissions coverage applies. Put the error in writing, send it to the title company's office manager, and follow up with the state insurance regulator if they go quiet.

Sometimes the "error" is really a dispute over whose job it was to pay a tax that came due after closing. That's a contract question. A real estate attorney in your state can read your purchase agreement and tell you in about an hour whether you have a real claim.

A separate fight: if the tax used for proration rests on an assessment you think is too high, that's about the assessed value, not the closing math. Winning a reduction lowers your future bills. Plenty of homeowners handle this alone with a structured appeal kit rather than hiring a contingency firm that takes 25% to 40% of the savings. TaxFightBack's DIY appeal kit lays out the evidence and deadlines step by step so you keep every dollar of the reduction.

What should I bring to closing to verify the proration?

Three things make the review fast and accurate: the most recent tax bill, a note of the seller's exemptions, and a calculator with the formula above.

First, the most recent property tax bill or statement from the county assessor or tax collector. Download it straight from the county website before closing day. Counties like LA County and Hennepin County let you pull current and prior year bills online in minutes.

Second, a list of exemptions the seller has on record. Call or email the assessor's office and ask what's applied to the parcel. Many offices tell you over the phone.

Third, the math. It takes under five minutes and gives you either confidence in the closing agent's number or grounds to question it.

Here's why it pays off. A $500,000 home at a 1.2% effective tax rate carries a $6,000 annual bill and a $16.44 daily rate. A 10-day error in the seller's day count is $164. Check it.

Are there any states where property tax proration works very differently?

A handful of edge cases change the picture. California, Florida, Texas, New York, and Illinois each run proration on their own logic, and the standard formula can mislead you in every one of them.

California: Proposition 13 caps assessed value increases at 2% a year until a change of ownership, when the value resets to the purchase price ^[4]. The proration at closing uses the seller's older, often much lower, tax amount, but the buyer's first full-year bill runs off the purchase price. Budget for the jump. California also sends supplemental assessments after closing, and those land entirely on the buyer.

Florida: the Save Our Homes cap limits annual increases to 3% or the CPI, whichever is lower, on homestead properties ^[9]. The cap resets when the property sells. The closing proration uses the seller's capped amount; the buyer's bill climbs.

Texas: no state income tax, so property taxes carry more weight. Effective rates of 1.6% to 2.5% are common across many counties ^[8]. Close mid-year with no bill issued and the estimate can miss badly if values jumped. Cross-check the prior year's bill at the county appraisal district site. For Bexar County, that's the Bexar Appraisal District.

New York: a four-class property tax system, layered further in New York City, means proration benefits from a local closing attorney who knows which class your property sits in ^[7].

Illinois: Cook County bills in two installments, and the first is estimated at 55% of the prior year's total ^[10]. The second installment reflects the actual current-year amount and sometimes shows up well after a spring or summer closing. A reproration clause is close to mandatory in Illinois contracts.

How does tax proration interact with escrow accounts after closing?

If you have a mortgage, your lender almost certainly requires an escrow account for taxes and insurance, and that adds a layer to the proration story. The closing credit and the escrow account move on separate tracks.

At closing, the lender collects an initial escrow deposit, usually two to three months of estimated taxes, as a cushion. From there, you pay one-twelfth of the estimated annual tax with each mortgage payment, and the lender pays the county when the bill is due ^[11].

The proration credit for the seller's share is separate. It reduces the cash you bring to closing and is meant to cover part of your first tax bill. But the lender doesn't always account for that credit when it sets up the initial escrow deposit. You can end up paying into escrow for taxes you already got credit for.

That's a timing mismatch, not fraud. After your first tax bill clears through escrow, the servicer runs an annual escrow analysis and refunds any surplus above the allowed cushion. RESPA caps that cushion at two months of escrow payments ^[11]. Some homeowners are still surprised when the first analysis produces a refund check. That money was theirs all along.

For most online tax payment for property setups, the servicer pays automatically. Knowing the cycle just means you can catch errors in your annual escrow statement.

Frequently asked questions

What is the standard formula for property tax proration at closing?

Divide the annual tax bill by 365 for a daily rate. Multiply that rate by the number of days the seller owned the property in the tax year (through closing day or the day before, per your contract). That amount is the seller's share; the buyer pays the rest. Some closing agents use a 360-day year, which produces a slightly different result.

Who gets the property tax credit at closing, buyer or seller?

In arrears states (most states), the seller hasn't paid the current year's taxes yet, so the buyer gets a credit equal to the seller's share of the year. In advance states, or when taxes are already paid past closing, the seller gets a credit back for the overpaid period. Your Closing Disclosure shows which direction the credit flows.

What does 'paid in arrears' mean for closing proration?

It means the tax bill for a given year comes due during or after that same year, not ahead of it. At closing, current-year taxes often aren't paid at all. The seller owes their share but hasn't paid it, so they credit the buyer that amount at closing. The buyer then pays the full bill when it comes due.

Can the proration amount change after closing?

Yes, if the actual tax bill differs from the estimate used at closing. Many purchase contracts include a reproration clause requiring the parties to true up once the real bill arrives. Without that clause, who covers the difference depends on the contract language and state law. Keep a copy of your Closing Disclosure and the estimate used to defend your position.

What happens to proration when the seller had a homestead exemption?

The tax bill used for proration reflects the seller's exemption, which lowers it. Once ownership transfers, that exemption drops off. Your first full-year bill as buyer will likely run higher than the prorated amount implied. Ask for the gross (un-exempted) tax amount before closing and budget for it. In most states, you won't qualify for a homestead exemption until the following January 1.

Does proration cover supplemental tax bills in California?

No. Standard closing proration in California uses the seller's existing tax amount. When ownership changes, the county issues a supplemental assessment bill based on the difference between the old assessed value and the purchase price, prorated for the months left in the fiscal year. That supplemental bill is the buyer's responsibility and is separate from the closing proration credit.

How do I find the correct tax amount to use for my proration calculation?

Download the most recent certified tax bill straight from the county assessor or tax collector's website. Use the total annual amount, not a single installment. If the current year's bill isn't out yet, use the prior year's as the estimate and note that in any reproration negotiation. Never take the listing agent's word for it; get the official document.

What if closing is in the middle of an installment period?

If your county bills in two installments and the first is already paid, the closing agent should account for that payment in the proration. The common error is forgetting to subtract a paid installment or double-counting it. Ask the closing agent to confirm which installments sit inside their base figure. This matters most in Illinois, where Cook County installments can be months apart.

How do property tax proration errors get corrected after closing?

Contact your title company in writing with your corrected calculation and supporting documents (the tax bill, your contract, and the Closing Disclosure). Title companies carry errors and omissions insurance and correct genuine math errors. If they decline, file a complaint with your state's department of insurance, which regulates title companies. For disputed contract interpretation, a local real estate attorney is the right resource.

Does proration affect my mortgage escrow account?

Indirectly. The credit you get at closing for the seller's share isn't deposited into escrow; it cuts your closing costs. Meanwhile, your lender starts collecting escrow contributions for future taxes. After the first tax bill is paid, the servicer runs an annual escrow analysis and refunds any surplus. RESPA caps the cushion at two months of escrow payments, so large overages get refunded.

Is property tax proration the same in every state?

The formula is consistent, but the details vary a lot. Tax year start dates differ (most states use January 1, but Maryland and New York use July 1). Billing cycles split between arrears and advance. California and Florida have assessment caps that reset at sale, making the proration amount look low next to the buyer's first real bill. Always confirm local practice with your closing agent.

Can I negotiate who pays the property taxes at closing?

Yes. Proration terms are negotiable in the purchase contract. You can negotiate which day counts as the seller's last, whether to use the 365-day or 360-day method, whether to add a reproration clause, and who bears the risk of a higher-than-estimated bill. These are small but real negotiating points, especially in high-tax markets where the daily rate runs high.

What is a reproration clause and should I insist on one?

A reproration clause requires buyer and seller to recalculate the proration once the actual tax bill arrives, and to pay any difference above a stated threshold (commonly $100 to $500). It protects both parties from estimate errors. In states like Illinois where current-year bills land late, it's close to standard. In any state where the tax year isn't settled at closing, it's worth requesting.

How does proration work if the property changed ownership twice in one year?

Each sale is prorated on its own. The first seller is credited for their days, the interim buyer is credited for their days when they sell, and the final buyer picks up the remainder. It's the same formula applied twice. The main risk is that the annual tax figure used as the base can shift if multiple assessments hit the same year. Confirm with each closing agent which bill they used.

Sources

1. Consumer Financial Protection Bureau, Closing Disclosure explainer: The Closing Disclosure is required under RESPA and must be provided at least three business days before closing, showing proration and other settlement charges.
2. Cornell Law School Legal Information Institute, RESPA and settlement statement rules: Settlement charge calculations, including day-count conventions used for tax proration, are set out in closing documents governed by RESPA and Regulation X.
3. National Association of Realtors, property tax proration guidance: In arrears billing states, the seller credits the buyer at closing for the seller's portion of unpaid current-year taxes.
4. California State Board of Equalization, Proposition 13 overview: Under Proposition 13, a change of ownership resets the assessed value to the purchase price, and supplemental assessments are issued to cover the partial year after sale.
5. National Association of Insurance Commissioners, title insurance regulation: State departments of insurance regulate title companies and accept complaints about errors and omissions in closing calculations.
6. Lincoln Institute of Land Policy, property tax exemptions report: Homestead exemptions in most states require ownership and occupancy as of January 1 of the tax year; buyers who close after that date typically cannot claim the exemption for that year.
7. New York City Department of Finance, property tax information: New York City's property tax fiscal year runs July 1 through June 30, affecting proration start and end dates.
8. Texas Comptroller of Public Accounts, property tax basics: Texas property tax bills are issued in October and due January 31 of the following year; closing proration uses the prior year's bill as an estimate when the current year is not yet certified.
9. Florida Department of Revenue, Save Our Homes cap information: Florida's Save Our Homes assessment limitation caps annual increases at 3% or the CPI for homestead properties; the cap resets to the purchase price when the property is sold.
10. Cook County Assessor's Office, tax bill explanation: Cook County issues a first installment estimated at 55% of the prior year's total tax, with the second installment reflecting the actual current-year amount and often arriving months later.
11. Consumer Financial Protection Bureau, escrow accounts and RESPA: RESPA limits the escrow cushion a servicer may hold to two months of escrow payments; annual escrow analyses must refund surpluses above that limit.
12. Maryland Department of Assessments and Taxation, tax year calendar: Maryland's property tax year runs July 1 through June 30, not the calendar year, affecting proration calculations for closings in that state.