The deadline
The IRS Heavy Vehicle Use Tax (HVUT) under 26 USC §4481 covers commercial trucks with a taxable gross weight of 55,000 lbs or more. The 2026 tax year runs from July 1, 2026 through June 30, 2027. The annual filing - IRS Form 2290 - is due by August 31, 2026 for vehicles first used on public highways in July 2026.
Trucks first used after July are due by the last day of the month following the first-use month. A truck first used on August 14, 2026 is due by September 30; one first used on December 5, 2026 is due January 31, 2027 - a Sunday, so the return can be filed on the next business day, February 1, 2027.
Why this matters
The stamped Schedule 1 the IRS returns is your proof of HVUT payment. States generally require proof of HVUT payment - the stamped Schedule 1 - before they will register a taxable vehicle. For registrations processed in July, August, or September, the IRS allows the prior period's stamped Schedule 1 to be used, but the current-period return is still due by its deadline.
Late filing and late payment can trigger penalties under 26 USC §6651: 4.5% of the unpaid tax per month or part of a month for up to 5 months (capped at 22.5%) for failure to file, a separate 0.5% per month for failure to pay, plus interest. The full-year HVUT for a truck over 75,000 lbs is $550.
E-file vs paper
Electronic filing is required for each return reporting and paying tax on 25 or more vehicles (tax-suspended vehicles don't count toward the 25). Returns with fewer taxable vehicles may be e-filed or paper filed; the IRS encourages everyone to e-file.
E-filing goes through a provider participating in the IRS e-file program for excise taxes, and a watermarked Schedule 1 can be available within minutes after the return is accepted. Source: IRS, Instructions for Form 2290: https://www.irs.gov/instructions/i2290
What to do next
Add the August 31 deadline to your annual compliance calendar. A bookkeeper or compliance vendor should be filing this for you in late July to early August - not waiting until the last week.
If you bought a truck mid-year, file within the first-use deadline. Don't conflate it with the August 31 annual.
Keep the stamped Schedule 1 with your records - states use it as proof of payment when you register vehicles.