AB 1482 Rent Increase Guide 2026 — Calculate Your Maximum Allowable Increase

California's Assembly Bill 1482 — the Tenant Protection Act of 2019 — imposes annual rent increase limits on millions of California rental units. For Inland Empire landlords with properties subject to AB 1482, calculating the correct maximum increase, providing proper notice, and documenting service correctly is not optional. Violations expose landlords to significant legal liability, including tenant claims for wrongful rent increase and potential interference with the landlord-tenant relationship that can complicate future eviction proceedings. This guide explains exactly how to calculate your 2026 maximum allowable rent increase for properties in Riverside and San Bernardino counties.

What Is AB 1482 and Who Is Covered in 2026

The Tenant Protection Act of 2019 (AB 1482) created statewide rent increase caps and just-cause eviction protections for residential tenants in California. The law applies to most residential rental properties that are more than 15 years old — measured on a rolling basis from the current year. In 2026, this means properties built before January 1, 2011 are subject to the rent cap provisions, provided they are not otherwise exempt. This rolling date is important: a property built in 2010 became covered by AB 1482 in 2025, and properties built through 2011 became covered in 2026. Landlords who assumed their property was exempt based on an older analysis should recheck coverage annually.

Several categories of property are exempt from AB 1482's rent cap provisions, though some remain subject to the just-cause eviction requirements. Single-family homes and condominiums are exempt from the rent cap if the owner provided the tenant with a written notice of exemption at the time of lease signing or renewal. This notice must contain specific statutory language required by Civil Code Section 1946.2. If the required exemption notice was not served, the property may be subject to the rent cap even if it would otherwise qualify for exemption. Properties with affordability deed restrictions, dormitories, and certain other housing types are also exempt. Newly constructed properties built after January 1, 2005 remain exempt until they reach the 15-year threshold.

Understanding your property's coverage status is the critical first step before calculating any rent increase. An incorrect determination — assuming you are exempt when you are not — and subsequently imposing an above-cap rent increase creates legal exposure that can be costly to resolve. When in doubt, treat the property as covered and apply the AB 1482 formula. Consulting with a California landlord attorney or a professional property management company for a coverage determination is advisable for any landlord uncertain about their property's status, particularly given the rolling 15-year construction date that changes coverage every year.

How to Calculate Your 2026 Maximum Rent Increase — CPI + 5% Formula

AB 1482 limits annual rent increases to the lesser of: (a) 10% of the lowest rent charged in the prior 12 months, or (b) 5% plus the percentage change in the Consumer Price Index for the relevant metropolitan area, measured April to April. For Southern California landlords — which includes Riverside and San Bernardino County — the applicable CPI is the Los Angeles-Long Beach-Anaheim Metropolitan Statistical Area CPI, published by the Bureau of Labor Statistics. This is not the national CPI, and using national CPI figures would result in an incorrect — and potentially illegal — calculation.

For 2026, the Southern California (Los Angeles-Anaheim MSA) CPI increase measured April 2025 to April 2026 is approximately 3.3%. This makes the AB 1482 formula calculation: 5% + 3.3% = 8.3%. The 10% absolute cap does not come into play at this CPI level (it only applies when CPI exceeds 5%, which would make the formula result exceed 10%). So the maximum allowable rent increase for AB 1482-covered properties in the Inland Empire for 2026 is 8.3%, provided the landlord has not already taken any increase in the preceding 12 months. AB 1482 allows only one rent increase per 12-month period — a landlord who increased rent in January 2026 cannot increase again in August 2026.

One important nuance: the 12-month measurement period for the "lowest rent charged" means the cap is applied to the lowest rent amount the tenant paid during the past 12 months, not simply the current rent. In most stable tenancies this is the same amount, but if a tenant received a temporary rent reduction or credits, the calculation becomes more complex. When in doubt, use the current contract rent as the base and document your methodology. Applying the increase correctly — and documenting that the increase does not exceed the lawful maximum — protects the landlord in any subsequent dispute.

Step-by-Step Calculation Example for IE Landlords

Let's work through the math with concrete examples using actual Inland Empire rent levels. Example 1: A Moreno Valley 3-bedroom with current rent of $2,200 per month. Maximum increase = $2,200 × 8.3% = $182.60. New maximum rent = $2,200 + $182.60 = $2,382.60. Landlords can round to the nearest dollar, so the new rent could be set at $2,382 or $2,383. The landlord cannot increase to $2,400 without exceeding the cap. Note that landlords are not required to take the full allowable increase — setting the new rent at $2,300 (a 4.5% increase, well within the cap) is perfectly lawful and may be preferable if tenant retention is a priority.

Example 2: A Riverside 2-bedroom with current rent of $1,800 per month. Maximum increase = $1,800 × 8.3% = $149.40. New maximum rent = $1,800 + $149.40 = $1,949.40, which can be rounded to $1,949 or $1,950. Example 3: A Fontana 4-bedroom with current rent of $2,600 per month. Maximum increase = $2,600 × 8.3% = $215.80. New maximum rent = $2,600 + $215.80 = $2,815.80, or $2,816. For properties where the current rent is significantly below market — perhaps because the tenant has been in place for several years without increases — landlords often want to take the full allowable increase annually to gradually close the gap to market rate. This is a legitimate strategy within the law's framework.

It is also important to understand what happens when a landlord misses the annual increase opportunity. Under AB 1482, a landlord cannot bank unused increase capacity and apply it in a later year. If you don't take any increase this year, you start fresh next year with whatever the new CPI + 5% formula allows based on then-current rent. There is no mechanism to "catch up" with a larger-than-allowed increase in a future year to account for years when no increase was taken. This makes it strategically important to evaluate annual increases each year rather than letting them lapse, particularly during periods of high CPI when the formula allows meaningful increases.

Proper Notice Requirements for Rent Increases

Even a correctly calculated rent increase becomes legally problematic if notice is not properly served. California law requires 30 days written notice for rent increases of less than 10% of the rent in the preceding 12 months, and 90 days written notice for increases of 10% or more. Since AB 1482 caps annual increases at 10% (and the 2026 cap is 8.3%), virtually all AB 1482 increases will require 30 days notice. However, if a landlord takes an increase now of 5% and then takes another increase 12 months later of 5%, and together those increases in a 12-month rolling window exceed 10%, the notice requirement becomes 90 days. This is a rare but real scenario that requires careful tracking.

The written rent increase notice must be served in a legally valid manner. Personal delivery directly to the tenant is always acceptable. First-class mail is also acceptable, but if mailing, California law adds five days to the notice period — so a mailed 30-day notice must be sent at least 35 days before the effective date of the increase. Certified mail is permitted but not required. Email delivery of rent increase notices is not valid under California law unless the tenant has specifically agreed in writing to receive legal notices by email — a provision that should be in the lease if the landlord wants this option. Simply emailing a notice, even if the tenant reads it, does not constitute valid legal service.

After serving the notice, document the service. If personally delivered, note the date, time, location, and who received the notice (tenant by name, or another adult at the premises). If mailed, keep a copy of the notice, document the mailing date, and retain the proof of mailing. This documentation is the landlord's evidence in any subsequent dispute that proper notice was given. Tenants who receive an improperly served rent increase notice — or one that exceeds the allowable cap — can contest the increase and may have additional remedies. Maintaining a clean paper trail for every rent increase protects the landlord's legal position.

Common Mistakes That Create Legal Liability

The most dangerous mistake an Inland Empire landlord can make under AB 1482 is imposing a rent increase that exceeds the allowable cap without realizing the property is covered. This happens when landlords assume their property is exempt based on construction date without accounting for the rolling 15-year window, or when they assume a single-family home exemption applies without having served the required written notice at lease signing. A tenant who receives an above-cap rent increase can file a complaint with local code enforcement or pursue the matter in small claims court. In some cases, above-cap rent increases have been held to constitute harassment or attempted constructive eviction, creating additional legal exposure beyond simply having to rescind the increase.

Using the wrong CPI figure is a subtler but equally consequential mistake. Landlords who use the national CPI instead of the Southern California MSA CPI will likely calculate a higher allowable increase than the law permits. The national CPI has historically been higher than Southern California CPI in recent years, meaning landlords using the national figure might impose an above-cap increase without realizing it. Always use the BLS data for the Los Angeles-Long Beach-Anaheim MSA, which is the statutory reference for Inland Empire properties. The BLS publishes this figure monthly, and the relevant measurement is April to April for increases taking effect any time during the subsequent 12-month period.

Another common mistake is the timing error: serving a 30-day notice but allowing insufficient time before the effective date. If you mail the notice on August 26, the 30-day period starts on August 27, and the increase cannot take effect until October 1 (accounting for the 5-day mailing addition). Landlords who date the notice August 26 with an effective date of September 25 — only 30 calendar days away — will find the notice is legally defective. Additionally, landlords who fail to keep a copy of the served notice have no evidence of proper notice if a dispute arises. Every notice should be kept in the tenant's file, ideally in the property management platform, for the duration of the tenancy and for several years thereafter.

Frequently Asked Questions