President Donald Trump issued an executive order on October 5 granting temporary relief from federal penalties for drivers using dyed diesel on public highways through December 31. The directive instructs the Treasury Department to assess whether certain federal fuel taxes can be deferred or potentially forgiven.
Four days later, Idaho Governor Brad Little ordered the Idaho State Police and the Idaho Transportation Department to suspend specific dyed-diesel inspections for 30 days. While this pause offers immediate breathing room for farmers, ranchers, truckers, and other businesses, it does not alter Idaho statutes prohibiting dyed diesel in vehicles operating on public roads.
The mismatch between federal and state timelines creates uncertainty for motorists. Federal penalty relief expires at the end of the year, but the governor’s inspection suspension lasts only a month. With the Idaho Legislature not returning for its regular session until January, lawmakers will not be available to address the issue before the state enforcement pause concludes.
Dyed diesel is marked with red dye because it is typically sold for off-road uses exempt from highway fuel taxes. Residual dye can linger in a fuel tank for months even after switching back to clear fuel, complicating efforts to prove accidental misfueling.
The Idaho Tax Commission advises that anyone who accidentally puts dyed diesel in a licensed vehicle should drain the fuel, replace filters, clean tanks and lines, refill with clear diesel, and pay applicable taxes. Trump’s executive order does not automatically forgive those federal diesel taxes.
Some states have moved to clarify compliance. Illinois has established recordkeeping requirements for qualifying users of dyed diesel, offering a potential model for how Idaho might handle verification once inspections resume. For now, drivers must navigate the gap between temporary federal leniency and ongoing state restrictions.