California Escape Assessment: The Bill for Value the Assessor Missed
An escape assessment is a back-dated property-tax assessment: the county assessor finds value that should have been on the roll in an earlier year — an unpermitted addition, an unrecorded transfer, an exemption granted in error — and assesses it now at that year's value and tax rate. This page sets out what the Revenue and Taxation Code allows: how many years back the assessor can reach, the notice you must receive, the 60-day appeal, the interest that can apply, and the four-year installment plan every county must offer on bills over $500, with how Los Angeles, San Diego and Santa Clara counties run it.
Quick answer
The assessor has four years from July 1 of the year the property escaped to make the assessment, eight years if the escape came from an unrecorded change in ownership with no ownership statement filed or carries the concealment penalty, and no limit for fraud or an unfiled legal-entity statement (§532). You get a written notice, and 60 days from it to appeal (§1605). The tax uses the prior year's rate (§534). If the added tax is over $500, you can pay it over four years in 20% installments (§4837.5), interest-free unless the escape was your own fault.
What counts as an escape
Revenue and Taxation Code §531: “If any property belonging on the local roll has escaped assessment, the assessor shall assess the property on discovery at its value on the lien date for the year for which it escaped assessment.” The Board of Equalization's Assessors' Handbook defines it as an assessment made after the assessor has certified the completed roll, and its Publication 30 gives the everyday case: a swimming pool built in September 2010 that the assessor did not value until September 2012 “is an escape assessment which will cause a roll change to a prior year.”
The San Diego Treasurer-Tax Collector lists the common causes of an escape bill:
- Construction done without a building permit.
- An unrecorded ownership transfer (§531.2(b): the assessor appraises as of the transfer date and enrolls the difference for each later year).
- A business audit that changed the property's assessment.
- An assessment that was corrected.
- A death the executor did not report to the assessor in time.
- An exemption that was incorrectly allowed (§531.6).
The tax on an escape uses the rate of the year it relates to (§534(a)). Where the escape came from a failure to file a property statement, interest of three-fourths of 1% a month is added from the date the tax would have been delinquent (§506), and the §463 penalty applies.
How far back the assessor can reach (§532)
| Situation | Limit | Statute |
|---|---|---|
| Any escape or underassessment, as the rule | Within four years after July 1 of the assessment year in which the property escaped | §532(a) |
| Willful concealment of personal property (25% penalty under §504) | Within eight years after that July 1 | §532(b)(1) |
| Unrecorded change in ownership with no Change in Ownership Statement (§480) or Preliminary Change of Ownership Report (§480.3) timely filed | Within eight years after that July 1 | §532(b)(2) |
| Fraud (75% penalty under §503), or a legal-entity change in control or ownership with no §480.1 / §480.2 statement filed | No limit — an escape is made for each year the property escaped | §532(b)(3) |
| Community land trust property that loses its §214.18 exemption | Within five years of the lien date after it becomes taxable | §532(b)(4) |
“Assessment year” means the period defined in §118, the calendar year. An assessment counts as made on the date it is entered on the roll, provided you are notified within 60 days of that entry (§534(b)). Supplemental assessments carry the same shape of limits in §75.11(d): four years, eight for the concealment penalty or an unrecorded transfer, none for fraud.
The notice you receive
- A Notice of Proposed Escape Assessment first. Under §531.8 the assessor must mail it before enrolling the escape; the BOE's 2008 Letter to Assessors says “no escape assessment may be entered on the roll until 10 days after mailing the notice.” This proposed notice does not start the appeal clock.
- Then the Notice of Enrollment (BOE form 66-A, or 66-B in counties that use the tax bill as notice). Under §534(c) it must state the mailing date, your right to an informal review and to appeal, the 60-day deadline, and how to apply for a reduction. No escape assessment “shall be effective for any purpose” until you have been notified (§534(b)).
- In Los Angeles County and §1605(c) counties, the tax bill is the notice: receipt of a bill that states the appeal right and the 60-day period satisfies §534 (§534(c)(3)), and the 60 days run from the bill's mailing or postmark.
Appealing within 60 days
An escape assessment is “an assessment made outside of the regular assessment period,” so the regular July 2 – September 15 (or November 30) window does not apply. Under §1605(b)(1) the application is due “no later than 60 days after the date of mailing printed on the notice of assessment, or the postmark therefor, whichever is later”; if you did not receive the notice at least 15 days before that deadline you may file within 60 days of the tax bill, with an affidavit. In Los Angeles County and counties that have adopted §1605(c), the 60 days run from the tax bill. File form BOE-305-AH with the clerk of the county assessment appeals board; the BOE's appeals FAQ places the burden of proof on the assessor for escape assessments that are not due to your failure to file a change-in-ownership statement, a business property statement or permits. The appeal guide lists every county's clerk and filing fee.
Paying it: the four-year plan under §4837.5
Any taxpayer may pay an escape assessment for a prior fiscal year over four years if the additional tax is over $500. The statute's terms:
- Ask in writing, in time. The request goes to the tax collector “prior to the time the second installment of taxes on the secured roll becomes delinquent, or by the last day of the month following the month in which the tax bill is mailed, whichever is later” (§4837.5(a)). The bill must carry a notice of the plan.
- 20% down, 20% a year. At least 20% is paid with the request, with current and prior-year taxes brought current; in each later year at least 20% of the original amount is paid before the second-installment delinquency date, along with that year's taxes (§4837.5(b)).
- Interest only if the escape was your fault. Three-fourths of 1% a month applies “if the escape or underassessment was due, in whole or in part, to the error, omission, or other fault of the assessee” (§4837.5(c)). No penalties accrue while payments are on time (§4837.5(d)).
- Default accelerates the balance. A missed installment, a tax default or a change of ownership makes the remaining tax “immediately due and payable” (§4837.5(e)); the tax collector may record a lien certificate.
- Fees. The tax collector “may establish a fee for the actual cost of processing” the request (§4837.5(i)).
| County | Plan name and start deadline, as the county states it | Fees the county lists | Note |
|---|---|---|---|
| Los Angeles | Four-Pay Plan — start "before the delinquency date of the escaped assessment tax bill" | $200 application fee (unsecured) | The county's glossary says the plan runs "without penalties or interest"; §4837.5(c) adds interest where the escape was the taxpayer's fault |
| San Diego | Four Year Payment Plan — agreement "before April 10th or by the extension date listed on the coupon, whichever is later" | $76 set-up, $81 a year maintenance | Web page says "greater than $500"; the agreement PDF also says "$500 or more" in one place |
| Santa Clara | Escape Payment Plan (4Y) — 20% "plus the interest (if any) by the April 10th delinquency date" | Not stated on the page read | Describes unsecured escape bills as due on the coupon date |
County figures are those counties' own, read October 22, 2026; other counties set their own fees. Where a county page and the statute differ, the statute governs — ask the tax collector how interest is applied before signing a plan.
Escape versus supplemental
| Supplemental assessment | Escape assessment | |
|---|---|---|
| What it is | The current-year adjustment after a sale or new construction, prorated for the months left | A prior-year assessment for value the assessor missed |
| Limit | Four years; eight for the concealment penalty or an unrecorded transfer; none for fraud (§75.11(d)) | Four years; eight for the concealment penalty or an unrecorded transfer; none for fraud or an unfiled legal-entity statement (§532) |
| Appeal | 60 days from the notice (§1605) | 60 days from the notice, or from the bill in LA and §1605(c) counties (§1605) |
| Installments | Not under §4837.5 | Four years if over $500 (§4837.5) |
| Estimate | Supplemental calculator, below | Prior year's rate on the missed value, plus any §506 interest |
For the one-time bill after a purchase, see the supplemental property tax guide and calculator.
Heirs: the escape notice and the Prop 19 exclusion
An inherited home that was never reported is a classic escape. The notice also reopens the exclusion: a BOE-19-P claim “shall be deemed to be timely filed if it is filed within six months after the date of mailing of a notice of supplemental or escape assessment, issued as a result of the purchase or transfer” (§63.2(f)(1)(B)). For homes reassessed after the 2025 Palisades, Eaton, Hurst, Lidia, Sunset or Woodley fires following an unrecorded transfer, SB 293 extends that to three years after the notice and treats a Homeowners' Exemption claim as timely within a year of it, for claims filed before January 1, 2031 (§63.2(f)(2)). A claim filed later than every window applies only from the lien date of the year it is filed (§63.2(f)(3)). The reassessment-after-death guide covers the form and the one-year exemption rule.
Frequently Asked Questions
What is an escape assessment in California?
A back-dated assessment for property that "escaped" the roll: value the assessor should have taxed in an earlier year but did not — an unpermitted addition, an unrecorded transfer, an exemption allowed in error, a business statement that was not filed. Under Revenue and Taxation Code §531 the assessor assesses it "on discovery at its value on the lien date for the year for which it escaped assessment," and the tax uses that prior year's rate (§534(a)). The Board of Equalization calls it "a retroactive assessment intended to rectify an omission or error that caused taxable property to be underassessed (or not assessed at all)."
How many years back can an escape assessment go?
Four years as the rule: under §532(a) the assessment must be made "within four years after July 1 of the assessment year in which the property escaped taxation or was underassessed." Eight years where the 25% penalty for willful concealment of personal property applies (§532(b)(1)), or where the escape came from an unrecorded change in ownership with no Change in Ownership Statement or Preliminary Change of Ownership Report filed (§532(b)(2)). No limit at all where the 75% fraud penalty applies or a legal-entity change-in-control statement was never filed: then an escape is made "for each year in which the property escaped taxation" (§532(b)(3)).
How is an escape assessment different from a supplemental assessment?
A supplemental assessment is the normal, current-year adjustment after a sale or new construction, billed once for the months left in the year. An escape assessment reaches back to prior years the assessor missed. Both have the same limitation shape — §75.11(d) gives supplemental assessments the same four years, eight years for the concealment penalty or an unrecorded transfer, and no limit for fraud — and both are appealed within 60 days of the notice (§1605). Only escape assessments over $500 qualify for the four-year installment plan in §4837.5.
How long do I have to appeal an escape assessment?
Sixty days. In most counties the clock runs from the date of mailing printed on the Notice of Enrollment of Escape Assessment, or its postmark, whichever is later (§1605(b)(1)); if that notice did not reach you at least 15 days before the deadline, you may file within 60 days of the tax bill with an affidavit. In Los Angeles County and any county whose board of supervisors has adopted §1605(c), the tax bill itself is the notice and the 60 days run from its mailing or postmark. File BOE-305-AH with the clerk of the assessment appeals board. The BOE's FAQ puts the burden of proof on the assessor for escape assessments that are not due to your own failure to file a change-in-ownership statement, a business property statement or permits.
Can I pay an escape assessment in installments?
Yes, if the additional tax is over $500 and the escape is for a prior fiscal year. Under §4837.5 you file a written request with the tax collector before the second installment of the current secured taxes becomes delinquent, or by the last day of the month after the bill was mailed, whichever is later; pay at least 20% with the request; then pay at least 20% of the original amount each year with your current taxes. Interest of three-fourths of 1% a month applies only if the escape was due, in whole or in part, to your own error or omission. A missed installment, a tax default or a change of ownership makes the balance due at once. Counties charge their own processing fees under §4837.5(i).
Does an escape assessment affect a Prop 19 parent-child exclusion claim?
It can save it. A BOE-19-P claim is timely if filed within six months after the mailing of a notice of supplemental or escape assessment issued for the transfer (§63.2(f)(1)(B)), even when the usual three-year window has passed. For homes damaged in the 2025 Los Angeles-area fires and reassessed after an unrecorded transfer, SB 293 extends that to three years after the notice and treats a Homeowners' Exemption claim as timely within a year of it, for claims filed before January 1, 2031 (§63.2(f)(2)).
Can the Homeowners' Exemption be applied to the years an escape assessment covers?
The three county tax collectors we read (Los Angeles, San Diego, Santa Clara) do not publish an answer, so ask your assessor. The statute covers the reverse case: an exemption that was "incorrectly allowed" is itself a trigger for an escape assessment (§531.6). Late Homeowners' Exemption claims are governed by §275 (80% of the exemption for a claim filed by December 10).
Learn More
Sources: Revenue and Taxation Code §§501–506, 531–538, 1603–1605.5, 4831–4837.5, 75.11 and 63.2 as published in the Legislature's bulk data (build of October 18, 2026; §4837.5 as amended by AB 985, effective October 1, 2025; §63.2 as amended by SB 293, effective January 1, 2026); Board of Equalization Assessors' Handbook 201 (1985, reprinted 2015 and not updated for later law — used only for the definition), Letters to Assessors 2002/014, 2008/021 and 2026/013, Publication 30 (February 2020) and the assessment-appeals FAQ; Los Angeles County Treasurer and Tax Collector, San Diego County Treasurer-Tax Collector and Santa Clara County Department of Tax and Collections pages, read October 22, 2026. County fees and deadlines are those counties' published figures and change; confirm with the tax collector. Educational information, not legal advice.
Last reviewed: October 2026.