# Regulatory Guidance on the Definition of “Principal Place of Business”
> **Federal Motor Carrier Safety Administration** · Notice of regulatory guidance. · Published 2009-07-29 · Effective 2009-08-12 · 74 FR 37653
## Document
- **Document number:** E9-18142
- **Category:** motor-carrier
- **Sub-agency:** Federal Motor Carrier Safety Administration
- **Federal Register citation:** 74 FR 37653
- **CFR reference:** 49 CFR 390
- **Publication date:** 2009-07-29
- **Effective date:** 2009-08-12
## Abstract

The FMCSA announces regulatory guidance concerning its definition of "principal place of business." The regulatory guidance is presented in a question-and-answer format and is generally applicable to motor carrier operations subject to the Federal Motor Carrier Safety Regulations. No prior interpretations or regulatory guidance concerning the term "principal place of business," whether published or unpublished may be relied upon as authoritative if they are inconsistent with the guidance published today. This guidance will provide the motor carrier industry and Federal, State and local law enforcement officials with uniform information for use in determining which locations may be designated by a motor carrier as its principal place of business.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/07/29/E9-18142/regulatory-guidance-on-the-definition-of-principal-place-of-business)
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