California FTB Notice of Proposed Assessment: How to Review and Respond
A California Franchise Tax Board Notice of Proposed Assessment means the FTB intends to assess additional California tax, penalties, interest, or some combination of those amounts.
The notice is not yet a bill.
If you disagree with the proposed assessment, California generally gives you 60 days to file a protest. If no timely protest is filed, the assessment generally becomes final and the FTB can bill the amount due.
What Is a California Notice of Proposed Assessment?
A Notice of Proposed Assessment, commonly referred to as an NPA, informs a taxpayer that the Franchise Tax Board intends to assess additional tax or penalties.
FTB procedures identify several reasons an NPA may be issued, including:
- An FTB desk or field audit
- A difference between the taxpayer's position and FTB's interpretation of California law
- Errors on a filed California return
- Information received from the IRS
- A federal tax adjustment
- Failure to file a required California return
- Failure to report income
- Failure to respond to an FTB request for information
- Other information indicating additional California tax may be due
The correct response depends on what generated the assessment.
A Notice of Proposed Assessment Is Not Yet a Bill
FTB expressly states that an NPA is not a bill.
If the taxpayer does not protest by the deadline, the proposed assessment generally becomes final and FTB can issue a Statement of Balance Due.
During the protest period, the taxpayer has an opportunity to challenge the proposed assessment before it becomes final.
The 60 Day Protest Deadline Is Critical
California Revenue and Taxation Code Section 19041 provides the principal protest procedure.
A taxpayer who disagrees with an NPA generally has 60 days from the date of the notice to file a protest.
The actual Protest By date printed on the notice should control the response calendar.
A taxpayer should not assume that contacting FTB informally, calling an auditor, gathering documents, or continuing correspondence automatically extends that deadline.
If the protest is not timely filed, Revenue and Taxation Code Section 19042 generally allows the proposed assessment to become final.
What Should an FTB Protest Include?
An effective protest should do more than state that the taxpayer disagrees.
FTB guidance provides that a written protest should identify:
- The taxpayer
- The tax years involved
- The amounts being protested
- The specific grounds for the protest
- A statement of facts
- Arguments supporting the taxpayer's position
- Relevant evidence and documentation
- Applicable legal authority
- The taxpayer's or authorized representative's signature
The protest can therefore require both factual and technical tax analysis.
Why Reviewing the FTB Calculation Matters
An FTB adjustment can identify a legitimate issue without necessarily producing the correct final California tax.
Examples include:
- FTB relying on incomplete federal information
- A federal adjustment that requires a different California calculation
- Income attributed to California that should be allocated or sourced differently
- A taxpayer treated as a California resident for a period when residency is disputed
- Deductions or basis information not reflected in the proposed adjustment
- A payment or credit not properly reflected
- An amended return that has not been fully incorporated
- An incorrect filing requirement determination
- A penalty included in the assessment that should be reviewed separately
Federal IRS Adjustments Can Create California FTB Assessments
California and the IRS exchange tax information.
An IRS examination or other federal tax adjustment can therefore result in a California FTB adjustment.
California Revenue and Taxation Code Section 18622 generally requires taxpayers to notify FTB of a final federal adjustment within six months.
A federal change should not simply be copied to the California return without analysis.
California does not conform to every federal tax rule, and state specific adjustments can change the California result.
The federal audit report, final federal determination, original California return, federal return, and California adjustments should therefore be reviewed together.
An IRS Adjustment Does Not Always Produce the Same California Result
Federal taxable income is often a starting point for California tax calculations, but federal and California tax law are not identical.
Depending on the tax year and issue, California may:
- Conform to the federal treatment
- Partially conform
- Apply a different effective date
- Require a California adjustment
- Apply different sourcing rules
- Apply different entity rules
- Disallow a federal deduction
- Provide a California adjustment not available federally
The correct California liability must therefore be computed under California law rather than assumed to equal the federal change multiplied by a California tax rate.
Missing Return NPAs Require a Different Analysis
FTB can also issue proposed assessments when it believes a taxpayer was required to file a California return but did not.
In that situation, the first issue may be whether there was actually a California filing requirement.
For an individual, relevant questions can include:
- California residency
- Part year residency
- California source income
- Business activity in California
- Rental property located in California
- Pass through income connected with California
- Filing status
- Income thresholds
For a business, the analysis can involve whether the entity was doing business in California, had California source income, or otherwise had a California filing obligation.
Interest Continues During an FTB Protest
Filing a protest does not stop interest from accruing on a proposed assessment.
FTB states that interest on additional tax generally continues from the applicable original payment date until payment.
A taxpayer who disputes the assessment may make a tax deposit while continuing the protest.
FTB provides specific pending audit tax deposit procedures for individuals, corporations, limited liability companies, partnerships, and other entities.
FTB also states that if it receives full payment within 15 days of the date of the NPA, it will not charge additional interest on the proposed assessment after the notice.
Making a deposit or payment does not necessarily require the taxpayer to abandon the protest.
Penalties Should Be Reviewed Separately
An NPA may include penalties in addition to proposed tax and interest.
The penalty should be identified by its California Revenue and Taxation Code section and analyzed separately from the underlying tax adjustment.
Relevant questions can include:
- What conduct triggered the penalty
- Whether FTB calculated the penalty correctly
- Whether the underlying tax adjustment is correct
- Whether reasonable cause applies
- Whether another statutory exception applies
- Whether the taxpayer may qualify for California's separate One Time Penalty Abatement provisions
Agreeing that some additional tax is due does not necessarily mean every related penalty is correct.
What Happens After You File an FTB Protest?
FTB reviews the protest and supporting information.
During that process, FTB may issue Information Document Requests seeking additional records or explanations.
A taxpayer may also request an oral hearing as part of the protest process.
At the conclusion of the protest, FTB generally issues a Notice of Action stating whether it affirms, revises, or withdraws the proposed assessment.
The Notice of Action Has a Separate 30 Day Appeal Period
If FTB affirms some or all of the proposed assessment, the Notice of Action generally provides a 30 day period for filing an appeal with the California Office of Tax Appeals.
The Office of Tax Appeals is a separate state agency from the Franchise Tax Board.
Notice of Proposed Assessment → generally 60 days to protest with FTB.
Notice of Action → generally 30 days to appeal to the Office of Tax Appeals.
The deadline printed on the actual notice should always be reviewed.
What If the 60 Day Protest Deadline Was Missed?
Missing the protest period materially limits the taxpayer's prepayment dispute options.
FTB guidance states that if a taxpayer misses the protest or appeal period, the taxpayer may generally pay the balance and pursue a claim for refund.
That is a different procedural path.
It is generally preferable to identify and protect the NPA protest deadline while the proposed assessment is still open rather than rely on post payment refund procedures later.
What Records Should Be Reviewed?
The documents needed depend on the issue, but an FTB NPA review can include:
- The Notice of Proposed Assessment
- The original California tax return
- The corresponding federal tax return
- FTB audit schedules
- Prior FTB correspondence
- Amended returns
- IRS audit reports
- IRS notices
- Final federal determination documents
- Account transcripts
- Payment records
- Business accounting records
- Forms K-1
- Real estate records
- Basis schedules
- Residency documentation
- California source income records
- Contracts or business records relevant to sourcing
The purpose is to reconstruct the facts supporting the filed California position and compare those facts with the assumptions FTB used in making the proposed assessment.
Can a CPA Represent You Before the California FTB?
Yes.
A taxpayer can authorize a representative to act before the Franchise Tax Board.
FTB Form 3520-PIT is used for individuals, estates, and trusts. FTB Form 3520-BE is used for business entities and certain group nonresident matters.
A properly authorized representative can communicate with FTB, receive confidential tax information, obtain account information, submit documentation, and represent the taxpayer during the protest process within the scope of the authorization.
When Does an FTB Notice of Proposed Assessment Merit Professional Review?
Professional review can be particularly useful when:
- The proposed assessment is substantial
- The NPA involves more than one tax year
- The assessment follows an IRS examination or federal adjustment
- Federal and California tax treatment differ
- California residency is disputed
- California source income is disputed
- Business or pass through income is involved
- FTB claims a return should have been filed
- Basis or transaction history must be reconstructed
- Penalties are significant
- The FTB adjustment cannot be reconciled to the filed return
- The protest requires legal authority or detailed factual support
- The 60 day deadline is approaching
- FTB has requested additional documentation
The objective is not simply to send a protest letter.
The objective is to determine the correct California tax result, identify the evidence supporting that result, and present the taxpayer's position before the proposed assessment becomes final.
Key Takeaway
A California FTB Notice of Proposed Assessment is a proposed tax adjustment, not yet a final bill.
The taxpayer generally has 60 days to protest.
Before agreeing with the assessment, review the California return, the FTB adjustment, supporting records, and any related federal tax changes.
A well supported protest should identify the factual and legal reasons the proposed assessment is incorrect rather than merely state disagreement.
For professional assistance reviewing an FTB notice, preparing a protest, or responding to a California tax adjustment, see my Tax Preparation and CPA Services.
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