California FTB Notice Schedule R Verification (FTB 4303)

FTB 4303 is the Franchise Tax Board’s notice asking your business to verify the apportionment factors reported on California Schedule R — the form used to calculate what percentage of your multistate business income is taxable in California. Schedule R uses three factors for most industries: sales in California divided by total sales everywhere (the most important factor, as California is a single-sales-factor state for most businesses), California payroll, and California property. The FTB sends FTB 4303 when those reported factors appear inconsistent with other data it has.

Common triggers include a reported California sales factor that seems low relative to what the FTB can see from information returns, prior-year California revenue figures that are substantially different from the current year without obvious explanation, or discrepancies flagged by California’s unitary business apportionment review program. The FTB actively compares Schedule R figures against sales tax data, employment records, and federal return information.

At The Reed Corporation, Schedule R verification notices require careful handling because apportionment methodology affects how much California income tax you owe. Getting it wrong — in either direction — has real consequences.

The core documentation the FTB wants is the detailed support for each apportionment factor on your Schedule R. For the California sales factor: customer contracts or invoices showing where customers are located, shipping records showing destination of goods, customer addresses from your accounting system, and for services, records showing where services were performed or where the benefit of the service was received. California uses a market-sourcing approach — the sale is California-sourced if the benefit is received in California, even if the work was done elsewhere.

For the payroll factor (if your business uses all three factors rather than single-sales-factor): W-2s and payroll records showing which employees worked in California and their compensation. For the property factor: lease agreements, property tax records, and asset schedules showing which property was located in California during the tax year. For each factor, the FTB wants both the numerator (California) and the denominator (everywhere) with supporting records for both.

Organization matters enormously in a Schedule R response. The FTB reviewer is looking at potentially hundreds of data points. We prepare a reconciliation that shows exactly how we calculated each factor, with supporting documentation indexed to the reconciliation. A well-organized response typically leads to faster closure and fewer follow-up requests.

California switched to single-sales-factor apportionment for most businesses effective for tax years beginning on or after January 1, 2013. Under this approach, only the California sales factor matters for calculating what percentage of your multistate net income is taxable in California — payroll and property in California are ignored in the formula. This means a business with lots of California employees but sales primarily outside California can have a small apportionment percentage, while a business with few California employees but most of its customers in California can have a large one.

The definition of ‘California sales’ under Revenue and Taxation Code Section 25136 uses a destination or market-based approach. For tangible goods, it’s where the goods are shipped. For services, it’s where the customer receives the benefit of the service — California-based customers generally result in California-sourced revenue. For intangibles (royalties, licensing fees), the analysis gets more complex and depends on where the intangible is used.

Industries excluded from single-sales-factor — like financial institutions, taxpayers under IRC Section 199A, and certain extractive businesses — still use the three-factor formula. Knowing which formula applies to your business is the starting point for any Schedule R analysis. We verify this before preparing any Schedule R, because using the wrong formula is one of the most common and expensive mistakes we see on multistate returns.

If the FTB determines your Schedule R apportionment was incorrect after reviewing your FTB 4303 response, it will typically issue a Notice of Proposed Assessment (FTB 6830) with revised apportionment figures and a calculation of additional California tax owed. You’ll then have 60 days to protest that proposed assessment. If the original apportionment understated California income, the assessment will be for additional tax plus interest and potentially a substantial understatement penalty (20% of the underpayment under R&TC Section 19164, triggered when the understatement exceeds the greater of $5,000 or 10% of correct tax if the understatement exceeds a certain threshold).

Alternatively, if the FTB’s review shows you over-apportioned income to California, the FTB can issue a refund — though this is less common, since the FTB’s goal in sending FTB 4303 is usually to find understated California income. If you believe your apportionment was actually correct and the FTB’s proposed revision is wrong, you’ll need to fight it at the protest level with detailed documentation of your methodology.

Apportionment disputes can also raise ‘throw-back rule’ issues. California’s throw-back rule (Revenue and Taxation Code Section 25135) generally doesn’t apply to most businesses now that California uses single-sales-factor, but it remains relevant in certain situations. We always double-check whether throw-back applies before finalizing any apportionment position.

California has very broad rules for when a business has a filing obligation (nexus) and when its income is taxable there. Under California’s ‘economic nexus’ standards, a business can owe California taxes even without physical presence if it has $711,538 or more in California sales (the 2024 threshold, adjusted annually) or makes 25% or more of its total sales into California. The Wayfair decision and California’s response to it also extended nexus to sellers without physical presence in California.

If you’re receiving an FTB 4303 and you think your California activity is minimal, it’s possible the FTB is seeing California-source income that you didn’t fully capture on your return. This sometimes happens with digital services, software licensing, and remote services where the destination-based sourcing rules mean more revenue is sourced to California than the business expected. It can also happen if any of your employees or contractors worked in California, even temporarily — payroll taxes paid to California trigger awareness of your company.

Before assuming the FTB is wrong about your California obligation, we do a thorough nexus analysis. Sometimes clients are genuinely surprised to learn they had a California filing obligation they weren’t aware of. And sometimes the FTB is wrong — particularly in cases involving businesses with very few California connections who receive an FTB 4303 because of a data mismatch. We identify which situation applies before drafting the response.