A provision in AB1815 significantly narrows the tax base for factory-built housing sales—but most manufacturers don't realize they may qualify.
Most California manufacturers don't know that AB1815, signed into law to streamline factory-built housing standards, contains a buried sales tax provision that could affect their tax liability. The provision cuts the taxable gross receipts base to just 40% of the sale price for qualifying factory-built housing—meaning you pay sales tax on less than half the transaction value.
Here's what changed and why it matters to your business.
Under AB1815, Section 11 (amending Revenue and Taxation Code § 6012.7), only 40% of the factory-built housing sale price is treated as taxable gross receipts for California sales and use tax purposes. This applies to manufacturers and dealers selling qualifying products.
The key expansion: AB1815 broadens the definition of "factory-built housing" to include "building assemblies"—a newly defined category. This means more products now potentially qualify for the reduced 40% tax base, not just complete housing units.
The practical effect is significant. If you sell a factory-built housing product or building assembly for $100,000, you calculate sales tax on $40,000 of gross receipts instead of the full amount. At California's combined state and local rates, this reduces your tax obligation substantially.
This provision applies to manufacturers and dealers producing or selling factory-built housing and building assemblies. If your operation involves:
• Manufacturing modular or prefabricated housing components
• Assembling factory-built housing units
• Selling building assemblies as defined under the expanded law
• Distributing these products in California
...you need to understand whether your products now qualify under the broadened definition.
AB1815 takes effect upon enactment under standard California legislative rules. The bill text does not specify an explicit operative date, meaning the provision became effective when the Governor signed it. If you're currently selling qualifying products, the reduced tax base should apply to transactions going forward—but you'll need to verify your products meet the statutory definition of "factory-built housing" or "building assemblies" as amended.
This is not retroactive to prior sales, but it does apply to all qualifying sales after enactment.
Review your product line against the newly expanded definition of "factory-built housing" and "building assemblies" in AB1815. If you believe your products qualify, work with your tax advisor or accountant to ensure your sales tax returns reflect the correct 40% gross receipts base. Misapplying the provision—or missing it entirely—can create compliance issues.
The language around "building assemblies" is the critical new piece. This term wasn't previously defined in the tax code, so determining what qualifies requires careful review of the statute and potentially guidance from the California Department of Tax and Fee Administration.
AB1815 was primarily designed to modernize building standards for factory-built housing. This tax provision was less publicized but can meaningfully reduce tax liability for qualifying manufacturers and dealers. Understanding whether you qualify is worth the effort.
For a free, detailed breakdown of AB1815's tax implications specific to your product category, industry associations and local business resources can provide guidance tailored to your operation.