California's property-tax calendar is one of those systems that makes complete sense once explained and traps nearly everyone before that. The fiscal year does not start in January, the two installments cover periods most people guess wrong, the due date and the delinquency date are different dates, and a brand-new owner can receive an extra bill nobody warned them about. None of it is difficult; all of it is unfamiliar. This article lays out the calendar and the dates that actually catch people. It deepens the property-tax guide; how the bill itself is composed is the bill-reading guide's subject. Standing frame, and it earns its place here: dates and procedures are set by statute and administered by Los Angeles County, they can change, and the County's own current published schedule and your tax professional govern — verify before relying on anything below.
The shape of the year
The property-tax FISCAL YEAR in California runs from July through the following June — not the calendar year — which is the single fact that makes everything else click. The annual bill is issued in the autumn and is payable in TWO INSTALLMENTS, each covering half of that fiscal year, with the first installment covering the earlier half and the second covering the later half. Each installment has a DUE DATE and, separately, a DELINQUENCY DATE some weeks later, after which penalties attach. That gap between due and delinquent is where most of the public confusion lives: people hear one date from a neighbour and another from a website and conclude the system is arbitrary, when in fact both dates are real and mean different things. Two more structural points. The bill is issued to the owner of record as of a fixed LIEN DATE — the assessment snapshot the whole year hangs on — which is why ownership changes have knock-on effects. And penalties for late payment are set by statute rather than by discretion, which means the county cannot simply waive them because a bill went to an old address; relief exists in narrow, defined circumstances, and it is a formal process rather than a phone call.
The dates that catch people out
THE SUPPLEMENTAL BILL is the big one for new owners, and it deserves its own guide — which this cluster gives it. A purchase triggers a reassessment, and the difference between the old assessment and the new one arrives as a SEPARATE bill, outside the normal annual cycle, sometimes months after closing, and often for a period the buyer assumed was already handled. It is not a mistake and it is not covered by the closing prorations; the supplemental guide is the full explanation. IMPOUND ASSUMPTIONS: an owner whose lender collects taxes through an impound account can reasonably assume everything is handled — and that assumption is exactly what fails after a purchase, a refinance, or a loan servicing transfer, because a supplemental bill is frequently NOT paid by the impound account and lands on the owner. Read what arrives rather than filing it. THE BILL THAT NEVER ARRIVED: bills go to the address of record, which after a purchase may lag; California is clear that not receiving a bill does not excuse the obligation, so a new owner who has not seen a bill by the expected point in the autumn should go looking rather than waiting. AND THE DECEMBER AND APRIL FOLK MEMORY: many people carry a half-remembered version of the deadlines. Look them up on the county's site each year rather than trusting the memory — it costs a minute and the penalty for being wrong is a statutory percentage.
Practical habits that prevent all of this
PUT THE COUNTY'S OWN DATES IN YOUR CALENDAR, from the county's own publication, once a year when the annual bill arrives. UPDATE YOUR MAILING ADDRESS with the assessor after buying, and check it after any change — this single step prevents the most common failure. OPEN EVERY TAX ENVELOPE, especially in the first year of ownership, because that is when supplemental bills appear and when impound assumptions are least reliable. BUDGET FOR THE FIRST YEAR HONESTLY: a purchase year involves the prorations handled at closing plus potentially a supplemental bill, and the buying guide's advice to model true cost of ownership rather than just the payment is exactly this in practice. AND IF SOMETHING IS ALREADY LATE, act rather than avoid: California's system has defined consequences that escalate over time, and unpaid taxes eventually become a tax lien and, over a long horizon, worse — the remedies and payment-plan options are real, published by the county, and far better used early. This is general information, not tax advice; the Los Angeles County Treasurer and Tax Collector's current published dates and procedures, and your own tax professional, govern.
Anthony Grynchal has been licensed in California since November 2009 and tells every buyer the same thing at closing: the escrow handled the prorations, not your whole tax year — open every envelope that arrives in the first twelve months.
Frequently asked questions
When are California property taxes due?
The fiscal year runs July through June, and the annual bill is issued in the autumn and payable in two installments covering the two halves of that year. Each installment has a due date and, separately, a later delinquency date after which statutory penalties attach — that gap is the source of most confusion. Verify the exact dates with the county each year.
Why did I get a second property tax bill after buying?
A purchase triggers reassessment, and the difference between the old and new assessment arrives as a separate supplemental bill outside the normal cycle — sometimes months after closing. It is not a mistake, it is not covered by the closing prorations, and it is frequently not paid by a lender's impound account.
What happens if I never receive my tax bill?
The obligation stands — not receiving a bill does not excuse it, and penalties are set by statute rather than discretion. Bills go to the address of record, which often lags after a purchase, so update your mailing address with the assessor and go looking if nothing has arrived by the expected point in the autumn.
Does my mortgage impound account cover everything?
For the regular annual installments, usually. The assumption fails on supplemental bills after a purchase or refinance, and around loan servicing transfers — those commonly land on the owner directly. Open every tax envelope in the first year of ownership rather than filing it unread.
