If you run an interior design studio in California, sales tax is probably the most confusing part of your bookkeeping. You’re not quite a retailer and not quite a service provider. You’re both, often on the same invoice, sometimes on the same line item. Get the split wrong and you either overcharge clients on fees that were never taxable, or you underpay and build exposure the California Department of Tax and Fee Administration (CDTFA) can flag years later.
This guide covers what’s actually taxable under California law, then the part most guides skip: how the structure of your invoices and your books decides whether you’re compliant or quietly building an audit problem.
How California taxes interior design work
California doesn’t tax most services. It taxes the sale of merchandise, and it treats your professional fees as taxable whenever they’re tied closely enough to that sale. This distinction, from CDTFA Publication 35 (Interior Designers and Decorators), is the foundation everything else sits on.
Do you need a seller’s permit? If you sell any merchandise to clients (furniture, fabric, window coverings, cabinets, even finished drawings or renderings you hand over), you generally need a California seller’s permit and must collect tax on those sales. If your business is purely advisory and you never sell, install, or source merchandise for a client, you may not need one.
Professional fees are taxable only when tied to a sale. This is where most designers get tripped up. Tax does not apply to fees for services with no connection to a merchandise sale. A preliminary design consultation, reviewing samples and developing color schemes before any order is placed, is not taxable. Once a client places an order and you start measuring for draperies, sourcing furniture, or walking them through showrooms to select pieces they’re buying through you, those fees become taxable, because they’re now part of the sale.
The practical rule: invoice your consulting time before merchandise is ordered, list it separately, and it stays nontaxable. Keep billing the same way after the order is placed and it typically becomes taxable.
Labor depends on the category. CDTFA splits labor into three buckets:
- Fabrication labor (making or altering an item, such as cutting and sewing draperies, reupholstering, converting furniture) is taxable.
- Repair labor (refinishing, cleaning, restoring an item to its original use) is not taxable.
- Installation labor (hanging draperies or artwork once delivered) is not taxable.
Get the category wrong on an invoice and you’ll either overcharge tax on repair work or miss tax you owed on fabrication.
Delivery and shipping. Delivery charges are exempt only if they’re separately stated, made by a common carrier or the U.S. Mail, don’t exceed what the carrier charged you, and go directly to the client. Deliver with your own vehicle, or bundle shipping into a flat price, and the charge becomes taxable.
Improvements to real property. If you furnish and install items attached to a building (cabinets, blinds, flooring), you may be acting as a construction contractor for tax purposes, with a different set of rules (lump-sum versus time-and-materials contracts) governing whether you or your supplier owes the tax.
The part most guides miss? Your invoicing structure is your tax position
Nearly every article on this topic stops at “here’s what’s taxable.” What they don’t cover is that for a design firm doing $2M to $20M in revenue, the format of your invoices and the structure of your chart of accounts are what actually determine your tax exposure, not just the underlying facts of the job.
A few things we see repeatedly with design clients that generic guides never mention.
Cost-plus billing carries hidden risk. Invoice furniture at your cost and add a separate “design fee” to cover markup and overhead, and CDTFA treats your entire fee as taxable unless you can clearly document that part of it is genuinely nontaxable professional service. Firms that bill this way without airtight documentation are exposed the moment an auditor asks for backup.
The design industry gets audited more than you’d think. Because designer invoices routinely blend taxable and nontaxable charges on one line, CDTFA auditors know misclassification is common in this industry, which makes design firms a more frequent audit target than their revenue alone would suggest. Clean, itemized invoicing isn’t just good practice. It’s your primary defense.
Your bookkeeping needs to mirror the legal distinction, not paper over it. Knowing that repair labor is exempt and fabrication labor isn’t doesn’t help if your books don’t show it. Your QuickBooks Online chart of accounts and item list need separate categories that map directly to those CDTFA definitions, so your quarterly sales tax return isn’t reconstructed from memory at filing time.
Subcontractor documentation is a common gap. When you subcontract fabrication or installation, you need an itemized breakdown from the subcontractor showing materials, fabrication labor, and installation labor separately. Without it, you can’t correctly itemize the nontaxable portion on your own invoice to the client. Many subcontractors won’t provide this unless you ask.
This is where a bookkeeper who understands both design and California sales tax pays off. We’ve worked with design firms where switching from a single “Design & Materials” invoice line to properly itemized categories (nontaxable design consultation, taxable fabrication, taxable merchandise, nontaxable installation) cleared up close to a full percentage point of previously mis-paid tax on their annual filings. Not fraud. An invoicing template that predated anyone checking it against the actual rules. This is the same discipline behind job costing for design and construction firms, where clean categorization drives both tax accuracy and project margin.
Frequently Asked Questions
Is an interior design consultation taxable in California?
Not on its own. A standalone design consultation, before any merchandise order is placed, is a nontaxable professional service. It becomes taxable once it’s tied to a specific sale of furniture or other merchandise you’re providing.
Do I need a seller’s permit as an interior designer?
Yes, if you sell any merchandise to clients, including samples or finished drawings you transfer to them. If you provide advice only and never sell, install, or source merchandise, you may not need one. CDTFA Publication 107 has the specific criteria.
Is delivery or shipping taxable in California?
It depends. Delivery charges are exempt if they’re separately stated, made by a common carrier, don’t exceed the carrier’s actual charge, and go directly to the client. Using your own vehicle or bundling delivery into a flat price generally makes the charge taxable.
Is labor taxable for interior designers in California?
Only fabrication labor (making or altering an item) is taxable. Repair labor and installation labor are not, provided they’re itemized separately on the invoice.
What happens if I’ve been invoicing incorrectly?
CDTFA record-keeping requirements run four years, longer in certain circumstances, so miscategorized invoices can surface in an audit well after the fact. If you suspect your invoicing doesn’t match the taxable/nontaxable split, have your books reviewed before an audit forces the issue.
Get your invoicing and books aligned with CA sales tax rules
If the taxable-versus-nontaxable breakdown above left you wondering how your own invoices and QuickBooks setup hold up, that’s exactly the review we do for interior design firms. We look at how your fees, labor, and merchandise are categorized, flag where you’re carrying audit risk or leaving money on the table, and rebuild your invoicing template so it maps cleanly to CDTFA’s rules. This pairs directly with getting your client deposit accounting right, since deposits and merchandise sales run through the same invoices. If you want fractional CFO support for interior design firms, that’s where we start.
Book a call and we’ll walk through your specific setup.
