What Supporting Documents Are
Supporting documents are any records that corroborate a driver's hours-of-service log. Under FMCSA regulations, supporting documents can include: fuel purchase receipts (showing time, location, and vehicle), toll receipts, electronic records from dispatch systems (mobile communication records, load assignments with timestamps), border crossing records, weigh station receipts, inspection receipts, and any other business records that record the driver's location and time.
These documents are not the primary HOS record — the ELD or paper log is. Supporting documents serve as corroborating evidence that the primary record accurately reflects actual driving activity.
Why They Matter For ELD Compliance
Supporting documents are particularly important during ELD malfunction periods, when paper logs must be reconstructed from available records. A driver who retains fuel receipts, toll records, and dispatch messages during a malfunction period has a documented evidence base for the reconstructed paper logs — which is significantly stronger than a reconstruction from memory alone.
During routine inspections and audits, supporting documents may also be used to verify that ELD records align with actual activity. FMCSA enforcement can compare ELD records against available supporting documents to identify inconsistencies.
What To Collect During Normal Operation
Drivers should retain: paper fuel receipts (even if payment is made by fleet card), toll receipts, any paper documentation from weigh stations or border crossings, and any dispatch messages that record locations and times with timestamps. Electronic dispatch records are generally accessible to the carrier, but paper receipts at the driver level provide immediate backup.
The habit of retaining supporting documents during normal operation is particularly valuable if an ELD malfunction occurs unexpectedly — the documents will already exist for the period before the malfunction.
Retention Requirements
FMCSA regulations require that supporting documents be retained for a minimum period. Under 49 CFR 395.8, records of duty status and supporting documents must generally be retained for 6 months. The carrier is responsible for retaining supporting documents submitted to them; drivers are responsible for documents in their possession during a trip.
Verify the current retention requirement in 49 CFR 395.8 and any FMCSA guidance, as requirements can be updated.
Related Pages
Related Fault Code Pages
Sources
- ELD Malfunctions and Data Diagnostic Events Federal Motor Carrier Safety Administration · government · accessed 2026-05-05 · confidence high
Source: Federal Motor Carrier Safety Administration, ELD Malfunctions and Data Diagnostic Events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - 49 CFR 395.34 - ELD malfunctions and data diagnostic events Electronic Code of Federal Regulations · government · accessed 2026-05-05 · confidence high
Source: Electronic Code of Federal Regulations, 49 CFR 395.34 - ELD malfunctions and data diagnostic events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - 49 CFR Part 395 Appendix A to Subpart B - Functional Specifications for ELDs Electronic Code of Federal Regulations · government · accessed 2026-05-05 · confidence high
Source: Electronic Code of Federal Regulations, 49 CFR Part 395 Appendix A to Subpart B - Functional Specifications for ELDs. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
What is the minimum number of supporting documents required per day?
FMCSA regulations address what types of documents carriers must retain, but do not mandate a specific minimum number of documents per driver per day. The standard is that supporting documents corroborate the HOS record — a day with documented fuel transactions, a weigh station receipt, or timestamped dispatch messages has stronger corroboration than a day with no documents at all.
Do electronic dispatch records count as supporting documents?
Yes. Electronic records from on-board communication systems, mobile dispatch apps, and fleet management systems that record timestamps and locations qualify as supporting documents. Many carriers retain these electronically as part of their fleet management systems. Ensure the records are accessible for the retention period required by regulation.
Can a carrier require drivers to submit supporting documents?
Yes. Motor carriers can require drivers to submit supporting documents as part of their fleet compliance procedures. Drivers should follow their carrier's policy. FMCSA enforcement also has authority to obtain supporting documents from carriers during compliance reviews.