California FTB Notice of Proposed Assessment (NOPA) Protest

The situation

Jennifer, 41, owns a 6-person marketing agency in Los Angeles as a California S-corporation. She's her own bookkeeper and files her own taxes through her CPA. Last week she received a certified letter from the FTB: "Notice of Proposed Assessment, Additional Tax Due: $11,400 (including penalty and interest)."

The NOPA letter lists two items: 1. Income mismatch: FTB's records show $38,000 in 1099-NEC payments from three different clients in 2023. FTB claims her 2023 return does not reflect this income. Proposed additional tax: $4,800. 2. Business deduction disallowance: FTB disallowed $22,000 of business travel, meals, and software expenses claimed on Schedule C of her 1120-S (the S-corp return). Proposed additional tax: $4,200. Total with 20% accuracy penalty: $11,400.

(a) The $38,000 1099 income WAS reported. Her three client payments were included in her S-corporation's gross receipts. The FTB's data-match failed to reconcile the 1099-NEC payments to the corporate return (because the 1099s were issued to Jennifer personally as a sole proprietor EIN, while the S-corp has a different EIN). This is a documentation-only fix: she needs to show the FTB that the income in the 1099s is the same income as the "Client Revenue" line in her S-corp return. This protest point is likely to succeed completely.

(b) The $22,000 deduction disallowance is partly recoverable. Jennifer has receipts for ~$16,000 of the $22,000. The remaining $4,000 was estimated based on general expenses without individual receipts. If she can document the $16,000 with supporting evidence, she can reduce the disallowed amount from $22,000 to $6,000, and the penalty applies only to the remaining disallowed amount.

(c) The 20% accuracy penalty ($1,820) may be separately abatable. FTB grants penalty abatement on first-offense for reasonable cause. Jennifer has filed California taxes for 8 years without a penalty, she qualifies for FTB's first-time abatement policy. This is a separate request, filed alongside the protest.

(d) Interest is accruing. Even if she files the protest, interest continues accruing on the full $11,400 at California's interest rate (~7% per year). She can pay the $11,400 now to stop interest (under protest), and recover it if the protest succeeds. Or she can accept that ~$800/year is accruing while the protest is resolved.

(e) A CPA quoted Jennifer $3,500 to handle the FTB response. The protest letter itself (addressing each NOPA item, gathering the documentation, and filing within 60 days) is the most time-sensitive and most self-executable part of the process.

Who receives this

California small business owners (sole proprietors, LLC members, S-corp owners, partnership members) who receive FTB NOPA letters for income tax issues: income mismatches (most common), business deduction disputes, S-corp compensation issues, or PTET credit disputes. Secondary: any California taxpayer (individual or business) who receives an FTB NOPA penalty notice and wants to understand whether to protest, pay, or abate. Primary industries: freelancers and consultants, small service businesses (marketing agencies, accounting firms, law offices, real estate agents), and small retail/e-commerce owners with complex deduction profiles. NOT suitable for: tax fraud investigations, large multi-year audits requiring full CPA/attorney representation.

Why the agency will not advise you

The FTB's enforcement division cannot provide guidance on how to contest its own assessments, its mission is to assess and collect tax, and providing protest guidance would undermine that mission. FTB's FTB 985 Publication describes the protest PROCESS but provides no guidance on the substantive arguments for each NOPA type. TurboTax Audit Defense and H&R Block's audit defense services are: (a) expensive ($50-$100/year subscription that typically covers federal IRS audits, not California-specific FTB proceedings); (b) focused on the audit investigation phase, not the NOPA protest letter. California CPAs know this process but charge $2,000-$10,000 for representation, making professional engagement irrational for smaller NOPAs ($5,000-$15,000).

Key facts, with sources

• The California Franchise Tax Board (FTB) issues Notices of Proposed Assessment (NOPA) to California individual taxpayers, S-corporations, partnerships, and LLCs when FTB determines additional tax is owed. Common triggers for small business NOPAs: (1) Income mismatch, 1099-NEC or 1099-K income reported by the payer but not matching California return; FTB uses data-matching technology cross-referencing IRS filings; (2) Business deduction disallowance, FTB disallows deductions the FTB says are not properly documented or exceed California rules; (3) S-corp reasonable compensation disputes, owner took minimal salary, FTB treats low-salary arrangements as understated income; (4) Pass-Through Entity Tax (PTET) credit disputes, misapplication of the PTET election rules (SB 132, effective 2026, changed the June 15 prepayment rules); (5) Late or missing returns, penalty notices. FTB penalty notices surged 32% in 2025 driven by enhanced data-matching technology that cross-references IRS filings, business registrations, and other state agency data. Upon receiving an NOPA, the taxpayer has 60 days to file a formal Protest or the assessment becomes final. Filing a protest does NOT stop interest from accruing, to stop interest, the taxpayer must pay the full balance (which can then be recovered if the protest is successful) or accept accruing interest while protesting. Source: FTB Notice of Proposed Assessment, How to Respond in 60 Days — Semper Tax Relief · Taxpayer Dispute Process Notice of Proposed Assessment — FTB.ca.gov · California Audit Triggers in 2026: What Every Business Owner and Freelancer Needs to Know — KDA Inc.
• After the 60-day protest period closes, if the FTB denies the protest or partially denies it, the FTB issues a Notice of Action (NOA). The taxpayer then has 30 days from the NOA to file an appeal with the California Office of Tax Appeals (OTA). OTA is a three-judge panel that conducts administrative hearings; taxpayers may request oral argument. At the OTA level, the complexity increases significantly and attorney/CPA representation becomes strongly advisable. The protest level (60-day window) is the most self-serve-accessible level, the protest letter is a written submission of facts and documentation, not a hearing. FTB's FTB 985 Publication ('Audit, Protest, Appeals, the Process') describes the appeals process but does not help taxpayers understand the substantive arguments for each NOPA type. FTB cannot provide guidance on 'how to contest our assessments', their role is to collect the assessed tax, not help taxpayers challenge it. Source: Disagree with an NPA (Protest) — FTB.ca.gov · FTB 985 Publication — Audit, Protest, Appeals the Process — FTB.ca.gov · A Quick Guide to Disputing California Tax Assessments — The Tax Adviser (AICPA)
• The FTB's data-matching program (implemented in 2023-2025) cross-references IRS 1099 filings, business registrations, and other state databases to identify income reported to the IRS that doesn't appear on California returns. Many of these NPOAs are generated for legitimate reasons the small business owner can explain: (1) The 1099-NEC income WAS included in gross receipts, the FTB's data match failed to reconcile properly; (2) The deduction WAS documented, the owner has the receipts but didn't know to attach them; (3) The PTET credit was calculated correctly but under the pre-2026 rules (SB 132 changed the rules effective January 1, 2026, creating confusion). For these common NOPA types, a well-documented protest letter, submitted within 60 days, typically results in full or partial protest success without tax attorney involvement. The critical piece most owners lack: knowing WHICH specific documentation the FTB needs for each NOPA type, and how to format the protest letter to address each NOPA item separately. Source: California Franchise Tax Board Audits — 101 Procedures, Disputes, and Practical Guidance — Ascendant LLP · California FTB Audit: Ultimate 4-Step Survival — SCL Tax Law

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. FTB Notice of Proposed Assessment, How to Respond in 60 Days — Semper Tax Relief
2. Taxpayer Dispute Process Notice of Proposed Assessment — FTB.ca.gov
3. California Audit Triggers in 2026: What Every Business Owner and Freelancer Needs to Know — KDA Inc.
4. Disagree with an NPA (Protest) — FTB.ca.gov
5. FTB 985 Publication — Audit, Protest, Appeals the Process — FTB.ca.gov
6. A Quick Guide to Disputing California Tax Assessments — The Tax Adviser (AICPA)
7. California Franchise Tax Board Audits — 101 Procedures, Disputes, and Practical Guidance — Ascendant LLP
8. California FTB Audit: Ultimate 4-Step Survival — SCL Tax Law