California FTB Notice Audit Issue Presentation Sheet (AIPS) (AUD 1541B)

The AUD 1541B, or Audit Issue Presentation Sheet (AIPS), is an internal FTB document that the auditor uses to formally present each issue under examination to their supervisor for approval before proposing an assessment. When you receive or see a reference to this document during your California FTB audit, it means the auditor has completed their analysis of a specific issue and is preparing to escalate it through the FTB’s review process. It’s a sign the audit is progressing toward a formal proposed assessment.

The AIPS documents the facts the auditor found, the legal authority they’re relying on, the proposed tax adjustment, and their reasoning. It’s part of the FTB’s quality control process — before an auditor can propose a change to your return, a supervisor must review and approve the AIPS. In some audit situations, the AIPS is shared with the taxpayer or their representative as part of the audit discussion, giving you an opportunity to see exactly what the auditor is proposing before it becomes official.

The Reed Corporation uses the AIPS as a roadmap in California audit representation. Seeing the auditor’s formal analysis before the assessment is issued gives us the opportunity to identify weaknesses in the FTB’s position, prepare counterarguments, and sometimes resolve issues at the audit level before they escalate to the protest stage.

Yes, and responding at the AIPS stage is often more effective than waiting for the formal Notice of Proposed Assessment. Once the auditor presents issues through the AIPS and the supervisor approves, the FTB issues a formal assessment that requires a protest to challenge. At the AIPS stage, the auditor still has flexibility to modify or withdraw the proposed adjustment based on additional information you provide. Getting the right documentation and legal arguments in front of the auditor early can change the outcome.

The most effective response to an AIPS includes: additional documentation that addresses the specific facts the auditor identified, a written legal argument explaining why your position is correct under California law, and any precedents from FTB published guidance, California OTA decisions, or court cases that support your position. California’s audit manual requires auditors to consider all relevant evidence submitted before finalizing their recommendation. A well-organized response at this stage carries more weight than the same materials submitted at protest.

Timing matters. Ask the auditor for the specific deadline to submit additional information before the AIPS is finalized — this is usually a defined window in the audit timeline. We prepare AIPS-stage responses for clients in California audits and know how to frame the technical and factual arguments in a format that gets auditor attention.

The most frequent issues raised in California personal income tax AIPS documents involve residency determinations, business income sourcing, unreported income from information return matching, and large itemized deductions relative to income. Residency is the biggest dollar-value issue — if the FTB’s auditor determines you were a California resident for more of the year than you reported, the resulting tax on worldwide income can be substantial. The auditor uses the ‘closer connections’ and ‘safe harbor’ analysis under the California Franchise Tax Board’s published residency guidelines.

Business income sourcing comes up frequently for entrepreneurs, consultants, and gig workers who have income from multiple states. California sources business income based on where the services are performed, but the FTB often disputes the allocation when significant income flows to or from California clients. The AIPS in these cases will typically include the auditor’s proposed reallocation of income to California, and the methodology — market-based versus cost-of-performance — can make a huge dollar difference.

Deduction disallowances are the third major category — home office deductions, vehicle expenses, meals and entertainment, and charitable contribution documentation are all commonly flagged. The AIPS will specify exactly which deductions are being disallowed and the legal basis. Knowing the auditor’s exact reasoning lets us target our response precisely.

Residency audits in California are among the most document-intensive and time-consuming FTB examinations. The auditor will request what’s known as a ‘day count’ — a log of where you physically were every day of the tax year in question. They’ll cross-reference that against financial records, credit card statements, phone records, medical appointments, and anything else that shows your physical location. The AIPS document in a residency audit will show how many days the auditor concluded you were in California and whether that crosses the residency threshold.

California presumes you’re a resident if you spend more than nine months in California — that’s the FTB’s bright-line rule, though being under nine months doesn’t guarantee nonresident status. The auditor looks at your domicile: where you have your closest ties, where your family is, where you vote, where you maintain professional licenses, and where you keep most of your personal property. The AIPS will lay out the auditor’s conclusion on each ‘tie-breaker’ factor and explain why they believe you maintained California domicile even if you spent significant time elsewhere.

The day count and domicile analysis are both areas where detailed, well-organized records make a significant difference. We’ve seen residency audit AIPS documents that contained factual errors — wrong dates, misidentified locations — that were worth correcting before the assessment issued. We build day count reconstructions from all available records and present them as a rebuttal to the auditor’s day count.

The AIPS is an internal FTB document, so there’s no fixed legal deadline that flows directly from its completion. After the auditor’s supervisor approves the AIPS, the FTB typically issues a Notice of Proposed Assessment (NPA) — that’s the formal assessment document that starts the legal clock. You have 60 days from the NPA date to file a written protest with the FTB. If no protest is filed within 60 days, the assessment becomes final.

The gap between the AIPS and the NPA varies — it can be a few weeks for straightforward issues or several months for complex audits with multiple issues. During this window, the audit discussion is technically still open and additional information can still affect the outcome. The auditor may send a ‘Notice of Proposed Adjustments’ or an ‘Information Document Request’ as intermediate steps. Each of these is an opportunity to present additional information before the formal NPA is issued.

We treat the period between the AIPS and the NPA as prime time for resolving issues at the audit level. Issues resolved before the NPA avoid the protest and appeal process entirely, saving significant time and expense. Once the NPA issues, resolving the case requires formal protest procedures with a higher evidentiary bar. We push to close audit issues at the AIPS stage whenever possible.