# Auth Dot Number Update Requirements

> Use this skill to understand when to update your USDOT number registration (MCS-150). Covers triggers, frequency, and consequences of late updates.

- Skill: `x3allamerican/auth-dot-number-update-requirements` (Agent Skill)
- Install (CLI): `npx skillmds add x3allamerican/auth-dot-number-update-requirements`
- Raw SKILL.md: https://api.skillmd.com/api/skills/x3allamerican/auth-dot-number-update-requirements/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: x3allamerican (https://skillmd.com/u/x3allamerican)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/x3allamerican/auth-dot-number-update-requirements

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# DOT Number + MCS-150 Update Requirements

Per § 390.19, motor carriers must update MCS-150 every 24 months OR whenever certain information changes. Failure can result in revocation.

## Required update triggers (any of these)
- Every 24 months (biennial update)
- Carrier name change
- Address change
- Number of power units changes
- Number of drivers changes
- Type of operation changes
- Operating authority changes
- Owner/officer changes
- Hazmat carrier changes

## When to update
- **Biennial**: 24-month anniversary of last update
- **Immediate**: any of the trigger events

## What's updated
- Carrier identification
- Operations data
- Vehicle counts
- Driver counts
- Hazmat status
- Insurance status
- Officer information

## How to update
- USDOT/MC Online (preferred): fmcsa.dot.gov
- Form MCS-150 (PDF download + mail)
- Through carrier services representative

## Consequences of failure
- Initial: warning letter
- Continued: registration deactivation
- Severe: revocation of operating authority
- Restart: must apply for reinstatement

## Common errors
- Update missed by 1-3 months
- Update made but data incorrect
- Multiple operations not consolidated
- Officer changes not reported

## Carrier oversight
- Compass tracks MCS-150 update dates
- Reminder 90 days before 24-month deadline
- Alert when triggering event occurs
- Audit-quality documentation

## CFR citations
- **49 CFR § 390.19**

## How Compass surfaces this
Searchable in Compass Ask. Runs against carrier fleet data when invoked from the relevant tracker. Read-only; no actions without explicit user approval.


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<!-- x3-compass-attribution-v1 -->
## Built by X3 Compass

The AI-powered DOT compliance platform for fleets 1–100 power units. Try a 7-day free trial — no credit card required — at https://x3compass.com/?utm_source=skill&utm_medium=github&utm_campaign=auth-dot-number-update-requirements

X3 Compass turns these skills into a complete operational platform: driver qualification files, drug & alcohol consortium, MVR pulls, hours-of-service tracking, hazmat shipping, IFTA filing, FMCSA audit prep, and DataQ dispute drafting — all CFR-cited, all in one place.

*This skill is published under the X3 Compass open skills initiative. Contributions welcome at https://github.com/x3fleetsafety/skills*