In Orange County, property taxes are prorated at closing based on how many days each side owned the home during the July 1 to June 30 tax fiscal year. If you’re buying or selling in Cypress, Buena Park, Anaheim, or anywhere else in OC, escrow calculates that split down to the day and shows it as a credit or debit on your closing statement.
By Austin Criss, REALTOR® | RE/MAX TIFFANY | July 28, 2026
Questions about how proration is going to land on your closing statement? Call or text me at 714.600.1176.
Property tax proration is one of those line items that looks confusing the first time you see it on a settlement statement, but the math behind it is straightforward once you know the rule. I walk almost every buyer and seller through this exact calculation before we close, because it’s rarely explained clearly anywhere else.
Here’s how it actually works, what it means for your closing costs, and what to expect after you own the home.
How Property Tax Proration Works in Orange County
Orange County runs its property tax fiscal year from July 1 to June 30, not the calendar year. The annual bill is split into two installments: the first due November 1 (delinquent after December 10), and the second due February 1 (delinquent after April 10).
When a home sells, escrow does not wait for a new bill to be issued. Instead, it prorates the current tax amount between buyer and seller based on the actual number of days each of you owned the property during that fiscal year. The seller pays for every day they owned the home up to closing. You, as the buyer, are responsible from the day you take ownership forward.
This is a hyperlocal detail that trips people up constantly: because the fiscal year starts in July, a summer closing in Cypress or Buena Park often falls close to the start of a new tax cycle, which changes how much gets prorated compared to a closing in, say, January.
What Happens If the Seller Hasn’t Paid the Current Installment
If the current installment hasn’t been paid yet at the time you close, escrow typically debits the seller for their prorated share and pays the county directly out of sale proceeds. You’re then credited or debited for your portion based on the actual close date. If the seller already paid the full installment, you’ll usually reimburse them for the days you’ll own the home during that period.
I see this trip up first-time buyers almost every closing: they assume the tax line on their statement is a fee. It’s not. It’s a wash between two parties for a bill that’s already been split by ownership days. The Orange County Treasurer-Tax Collector doesn’t get involved in proration at all. It’s strictly a private matter between buyer and seller, worked out through escrow.
Supplemental Tax Bills After You Close
Proration at closing only handles the seller’s existing assessed value. Once your sale records, the Orange County Assessor reassesses the property to your purchase price, and you’ll typically get a separate supplemental tax bill for the difference between the old assessed value and your new one, prorated for the remainder of that fiscal year. This bill arrives separately from your regular property tax bill and isn’t collected through your mortgage escrow account.
This is exactly the kind of surprise I try to get ahead of with every buyer before we even go into escrow. If you want the deeper breakdown, I’ve written a full guide on supplemental property tax in California that walks through the timing and typical amounts.
What This Looks Like on a Real Closing Statement
Say you’re buying a $1,000,000 home in Orange County and close on September 15. The seller owned the home for the first 76 days of the fiscal year (July 1 through September 14). You’ll own it for the remaining days. Escrow prorates the annual tax bill, roughly 1.1% to 1.25% of assessed value depending on the property’s Mello-Roos and special assessments, across those two ownership periods and adjusts your closing figures accordingly.
Here’s what typically shows up on your estimated closing statement:
- A credit or debit for the seller’s prorated share of the current installment
- A credit or debit for your prorated share going forward
- A separate note that a supplemental bill will follow once reassessment is complete
Here’s what I tell every buyer before we open escrow: don’t try to reverse-engineer this number on your own. Your escrow officer will show you the exact days-owned calculation, and I review that line with every client before we sign off on the closing statement. If you want the full picture of what else shows up on that statement, I cover it in my guide to closing costs for buyers in Cypress and Orange County.
Frequently Asked Questions
Who pays the property taxes at closing in Orange County?
Both sides pay, split by the number of days each one owned the home during the July 1 to June 30 fiscal year. If you close on a Cypress home in the middle of March, the seller covers taxes through the closing date and you take over from there. Escrow handles the math and shows it as a credit or debit on your statement, so neither side actually writes a separate proration check most of the time.
What is the Orange County property tax fiscal year?
It runs from July 1 to June 30, split into two installments due November 1 and February 1. This matters more than people expect because a summer closing in Buena Park lands close to the start of a new fiscal year, while a winter closing falls in the middle of one, which changes how the proration math plays out on your statement.
What happens if the seller hasn’t paid the current tax installment?
Escrow debits the seller for their prorated share and usually pays the installment directly out of sale proceeds at closing. You’re then credited or debited for your portion based on the actual close date. I’ve had sellers assume this gets sorted out after closing. It doesn’t. It’s handled the same day escrow funds.
Does property tax proration affect my loan approval?
No. Proration is a closing cost item between buyer and seller, not something your lender underwrites against. It shows up on your settlement statement, and any amount you owe is collected at closing along with your other closing costs.
Your specific proration amount depends on your closing date, your purchase price, and any Mello-Roos or special assessments on the property. That’s exactly the kind of number I run for my buyers before they ever get to the closing table.
If you want a straight answer on what your closing costs will actually look like, I’m happy to walk you through it. Call or text me at 714.600.1176. Always Ask Austin.
About Austin Criss
Austin Criss is a REALTOR® with RE/MAX TIFFANY serving Cypress, Buena Park, and throughout Orange County, California. He works with first-time buyers getting into their first home and move-up sellers navigating how to sell their current home and buy the next one at the same time. Call or text at 714.600.1176, or visit austincriss.com.