Before you read further — which describes you?
Quick Answer
Aircraft use tax in interstate commerce involves four analytical areas: (1) CA use tax on aircraft brought into state; (2) interstate commerce exemption for aircraft used in interstate / foreign commerce; (3) common carrier / principal use analysis; and (4) proper documentation of out-of-state purchase and interstate use. The short version is that aircraft purchases attract CA’s scrutiny — CDTFA aggressively challenges interstate commerce exemption claims. In our experience, the CDTFA interstate commerce exemption audit is among the most fact-intensive in state tax practice.1
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Four aircraft use tax analytical areas.
The Four Aircraft Use Tax Areas
| Area | Treatment2 |
|---|---|
| CA Use Tax | On aircraft in CA |
| Interstate Exemption | CDTFA Reg 1620 |
| Principal Use | 50%+ interstate |
| Documentation | Flight logs critical |
Quick Reference
Jump to: use tax, interstate, use test, or docs.
1. CA Aircraft Use Tax
Use tax on aircraft brought into CA for use.
If this is you: Purchased aircraft out of state and brought to CA. Use tax applies unless exempt. Significant dollar amounts.
Use Tax Strategy
- Determine CA use / storage.
- Evaluate exemption availability.
- Document interstate use.
- File use tax return.
- Engage counsel for audit.
2. Interstate Commerce Exemption
Aircraft principally used in interstate / foreign commerce exempt.
If this is you: Business aircraft used for interstate travel. CDTFA Reg 1620 exemption. 50%+ interstate use during first 6 months. Documentation intensive.
3. Principal Use Test
50%+ interstate flight hours / miles in first 6 months.
If this is you: First 6 months after first CA use. Flight time / miles measured. 50%+ interstate / foreign commerce required. Each leg analyzed.
4. Documentation Requirements
Flight logs, pilot records, passenger manifests.
If this is you: Preparing for potential audit. Flight logs contemporaneous. Purpose of each flight. Passenger manifests. Business purpose documented.
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Aircraft Tax Lookup
| Authority | Purpose |
|---|---|
| CA RTC §6201 | Use tax |
| CDTFA Reg 1620 | Interstate exemption |
| Flight logs | Documentation |
| FAA records | Registration |
| CDTFA Pub 79-A | Aircraft guide |
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Aircraft Tax Statute
- 3-year CDTFA statute.
- 8-year for unfiled returns.
- Unlimited for fraud.
Aircraft Tax Patterns
| Situation | Outcome |
|---|---|
| Proper interstate exemption | Exempt |
| Failed 50% test | Full use tax |
| Documentation weak | Exemption denied |
| Fractional ownership | Special rules |
Aircraft Tax Audit
Questionnaire
CDTFA aircraft questionnaire.
Documentation Review
Flight logs and records.
Assessment
If exemption denied.
First 48 Hours
- Preserve flight logs.
- Document business purpose.
- Assess exemption basis.
- Calculate exposure.
- Engage counsel.
The ROI Question
Aircraft tax easily reaches hundreds of thousands. Professional representation essential.
When to Engage
- Aircraft purchase with CA exposure.
- CDTFA aircraft audit.
- Interstate exemption claim.
- Fractional ownership.
Frequently Asked Questions
Is aircraft subject to CA use tax?
Yes when brought into CA for use / storage. Substantial dollar amounts. Interstate commerce exemption available for qualifying use.
What is interstate commerce exemption?
CDTFA Reg 1620 exemption for aircraft principally used in interstate / foreign commerce. 50%+ interstate use in first 6 months.
What is principal use test?
50%+ of flight time / miles in interstate / foreign commerce during first 6 months after first CA use. Subsequent use also monitored.
Does trip origin / destination matter?
Yes. CA-to-CA flights are intrastate. CA-to-out-of-state / out-of-state-to-CA interstate. Pure business purpose also relevant.
What documentation is required?
Flight logs, pilot reports, passenger manifests, business purpose documentation, invoices / expenses, maintenance records.
Are empty legs counted?
Yes typically. Repositioning flights part of analysis. All flight hours / miles counted.
What about fractional ownership?
Special rules apply. Each fractional owner’s use analyzed. Program operator responsibility. Complex analysis.
What if 50% fails?
Full use tax due. No partial exemption. Either qualifying (50%+) or not.
Does training count as use?
Yes. Pilot training flights counted. Often domestic. Factor into analysis.
What about personal use?
Personal use counted toward total. Still 50% test. Document mixed use carefully.
Can I claim exemption later?
Yes if 50% test satisfied. Refund claims within statute. Professional preparation.
What’s foreign commerce?
Flights between U.S. and foreign countries. Often counted with interstate for 50% test.
What’s CDTFA questionnaire?
Standard aircraft tax questionnaire to determine tax liability. Consult counsel before completing.
If you have read this far, you have a notice and you are trying to understand it before doing anything that makes it worse. That instinct is correct.
The next right move is a 15-minute call. We will identify the audit type, confirm your deadline, and tell you honestly whether you need representation. There is no cost and no obligation.
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Next Steps
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