1. Match the Tax Notice to the Agency That Issued It
The name at the top of the notice is often the most useful starting point. It identifies the government body handling the matter and helps separate federal, state, and county procedures.
IRS Notices Generally Follow Federal Procedures
An IRS notice may concern a return mismatch, examination, proposed deficiency, penalty, unpaid balance, lien, or levy.
The notice or letter number, tax period, stated adjustment, and response date should be read together. In an examination, the records that matter will usually be those supporting the items the IRS has questioned.
A matter focused specifically on an examination may overlap with tax audits and adjustments.
A statutory notice of deficiency is different from routine audit correspondence. A taxpayer generally has 90 days from the date of the notice to petition the U.S. Tax Court, with a 150-day period applying when the statutory requirements for an out-of-country case are satisfied. The deadline shown on the notice deserves separate attention because ordinary correspondence with the IRS does not replace a timely court filing.
California FTB Notices Use a State Protest Process
California personal income and franchise tax disputes commonly involve the Franchise Tax Board.
A Notice of Proposed Assessment, or NPA, states that the FTB proposes additional tax or penalties. A taxpayer who disagrees generally must protest within 60 days of the NPA date or by the protest date printed on the notice.
If the FTB later issues a Notice of Action and the dispute remains unresolved, an appeal generally must be filed with the California Office of Tax Appeals within 30 days.
An IRS adjustment and an FTB issue can arise from the same transaction, but they remain separate proceedings with separate notices and deadlines.
2. Identify What Kind of Tax Problem Has Reached the Taxpayer
Once the agency is clear, the nature of the dispute determines what records and legal issues matter. Filing, examination, and collection matters involve different procedural stages and usually call for different evidence.
Filing Problems Begin with the Return
A filing problem may involve omitted income, an incorrect deduction, inconsistent information reporting, an amended return, or a year in which no return was filed.
The relevant materials usually begin with the return, schedules, Forms W-2 or 1099, and records supporting the disputed entry.
For a business, accounting records and entity structure may also affect the analysis. Broader compliance issues may overlap with small business tax services, but a dispute review should stay focused on the year and adjustment identified by the agency.
An Audit Turns on the Item Being Examined
An audit does not necessarily place every financial record in dispute.
A questioned business deduction may require invoices, contracts, receipts, payment records, and evidence of business purpose. An income issue may instead depend on bank records, brokerage statements, Forms 1099, or transaction documents.
The agency's request should define the scope of the file. The useful question is not how much documentation exists, but which documents establish the facts behind the challenged item.
Collection Begins from an Assessed Balance
Collection is a later procedural stage from an examination or proposed assessment.
An IRS collection matter may involve a federal tax lien, proposed levy, installment arrangement, or Collection Due Process rights. When the IRS sends a notice that specifically provides a right to a CDP hearing, a timely request generally must be made within 30 days.
Whether the taxpayer can also challenge the underlying liability at that hearing depends on prior opportunities to dispute it and other procedural facts.
The assessment history therefore matters as much as the most recent collection notice. Unpaid federal liabilities may also require a separate tax debt resolution review.
3. Read the Entire Notice before Choosing a Response
The balance printed on a notice does not explain the whole case.
The document may show whether the agency is still proposing a change, has finalized an assessment, or has moved to collection. Attachments can contain the calculation, explanation, or filing instructions that determine the next step.
A practical review should identify:
- The issuing agency;
- Notice or letter type;
- Tax and tax period;
- Proposed or assessed amount;
- Penalties and interest, if listed;
- Reason given for the adjustment;
- Response deadline; and
- Available protest, appeal, hearing, or court procedure.
When several notices concern the same liability, they should be arranged chronologically. An examination report may explain a later deficiency notice, while the assessment record may explain subsequent collection activity.
4. Keep Federal and California Disputes on Separate Tracks
The same income, deduction, or business transaction can create both federal and California tax consequences. Shared facts do not create a single appeal process.
For a federal deficiency, a statutory notice may open the route to the U.S. Tax Court before payment. If that filing period expires, the taxpayer may need to consider a different procedure, such as payment followed by a refund claim where legally available.
California follows its own sequence. An FTB NPA can be protested with the FTB, and a later Notice of Action may be appealed to the Office of Tax Appeals.
Documents can be useful in both matters, but a filing with one agency generally does not preserve a deadline before the other.
5. Santa Clara County Procedure Matters for Property Assessment Appeals
Santa Clara County does not create a separate body of federal income tax law. Its local significance is stronger when the issue concerns property assessed within the county.
California law supplies the broader property tax framework, while the county administers assessments and the local appeal process.
Regular Assessments Have an Annual Filing Window
Santa Clara County currently lists July 2 through September 15 as the regular filing period for Assessment Appeal Applications.
That period can apply to disputes such as a decline in value or other regular assessment issues.
Supplemental and escape assessments generally use a different filing period tied to the applicable notice, often 60 days. The assessment type and notice should therefore be checked rather than assuming that the annual filing window applies.
Filing an assessment appeal does not suspend the obligation to pay the property tax bill when due.
Property Appeals Require Valuation Evidence
A property assessment dispute uses different evidence from an income tax case.
Depending on the issue, relevant records may include the assessment notice, property characteristics, comparable sales, purchase documents, leases, appraisal materials, or other evidence addressing value as of the applicable valuation date.
The evidence should answer the assessment being challenged rather than simply document the owner's broader finances.
6. Build the Tax File Around the Decision the Agency Must Make
A useful case file becomes narrower as the issue becomes clearer.
For a filing dispute, the return and supporting records are central. For an audit, the file should track the specific items under examination. An assessment protest requires the notice, factual basis, legal position, and prior submissions. A collection matter calls for the assessment history, payment history, notices, and prior opportunities for review.
Businesses may also need accounting ledgers, payroll records, entity documents, or records showing who filed the return and communicated with the taxing authority.
The goal is not to collect every financial document. It is to identify the record that answers the issue currently before the agency.
7. The Current Procedural Stage Determines the Next Review
A single “tax problem” can involve very different legal paths.
IRS examinations and federal deficiency proceedings follow federal law. FTB assessments use California's protest and appeal system. Santa Clara County property valuation disputes can require a county assessment appeal.
The review therefore comes down to four facts: who issued the document, which tax period it covers, what action has already occurred, and what deadline comes next. Together, those facts show which tax position, evidence, and review procedure require attention next.
27 Oct, 2026
