Excise tax penalties start small and stack fast. A deposit five days late costs 2% of the shortfall; a return two months late costs 10% of the tax owed; an underpayment the IRS calls fraudulent costs 75%; and collected taxes never turned over to the government can be assessed personally against owners and officers at 100%. Interest compounds daily on top of all of it. The good news is that most of the worst penalties require either willfulness or sustained neglect, and the IRS will waive some of them for taxpayers who acted in good faith.
Filing Late Costs Ten Times More Than Paying Late
If you miss the Form 720 deadline, 26 U.S.C. § 6651 adds 5% of the unpaid tax for each month or partial month the return is late, capped at 25%.1Office of the Law Revision Counsel. 26 U.S.C. 6651 – Failure to File Tax Return or to Pay Tax A return one day into its second late month already carries a 10% penalty.
Filing on time but not paying is far cheaper: 0.5% per month of the unpaid balance, also capped at 25%.1Office of the Law Revision Counsel. 26 U.S.C. 6651 – Failure to File Tax Return or to Pay Tax When both penalties run in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount, so the combined rate stays at 5% rather than 5.5%.
The practical rule writes itself. Always file, even if you can’t pay. Late filing costs ten times as much per month as late payment.
Late Deposits Have Their Own Penalty Schedule
Many excise taxes require semimonthly deposits well before the quarterly return is due, and missing those deposit windows triggers a penalty separate from anything owed on the return itself. Under 26 U.S.C. § 6656, the rate climbs with the delay:2Office of the Law Revision Counsel. 26 U.S.C. 6656 – Failure to Make Deposit of Taxes
- 1 to 5 days late: 2% of the undeposited amount
- 6 to 15 days late: 5%
- More than 15 days late: 10%
- Still unpaid 10 days after an IRS delinquency notice: 15%
A business that owes $50,000 in semimonthly deposits and misses the window by three weeks faces a $5,000 penalty before interest starts. Ignoring the delinquency notice takes it to $7,500.
Wrong Numbers Cost 20 Percent
Filing on time with sloppy figures triggers a different penalty. Under 26 U.S.C. § 6662, the IRS imposes 20% of any underpayment caused by negligence or disregard of the tax rules.3Office of the Law Revision Counsel. 26 U.S.C. 6662 – Imposition of Accuracy-Related Penalty on Underpayments Negligence here means failing to make a reasonable effort to comply: weak recordkeeping, ignoring IRS instructions, or reporting numbers without checking them against actual invoices. The same 20% rate applies to transactions the IRS finds lack economic substance.
Documentation is the defense. Every figure on Form 720 should trace back to an invoice, shipping record, or production log. When auditors can follow the paper trail, accuracy penalties rarely stick. When the trail has gaps, the IRS fills them with assumptions that don’t favor you.
Fraud Raises the Penalty to 75 Percent
When an underpayment results from intentional deception rather than carelessness, the penalty jumps to 75% of the fraudulent portion under 26 U.S.C. § 6663.4Office of the Law Revision Counsel. 26 U.S.C. 6663 – Imposition of Fraud Penalty The IRS carries the initial burden of showing some portion of the underpayment came from fraud. Once it does, the entire underpayment is presumed fraudulent, and the burden shifts to the taxpayer to prove by a preponderance of evidence which parts were not.
Keeping double books, hiding taxable transactions, and fabricating exemption certificates all satisfy the fraud standard. The line between a 20% negligence penalty and a 75% fraud penalty usually comes down to whether the IRS can show you knew the correct figure and reported a different one. On a $200,000 underpayment, that’s $40,000 versus $150,000 in penalty alone, before any interest.
The 100 Percent Trust Fund Penalty Reaches Your Personal Assets
Some excise taxes are collected from customers and held in trust until they’re remitted. Airline passengers pay taxes on their tickets; the airline holds that money for the government. If a business collects these taxes but doesn’t turn them over, the IRS can pursue any responsible person for 100% of the unremitted amount under 26 U.S.C. § 6672.5Office of the Law Revision Counsel. 26 U.S.C. 6672 – Failure to Collect and Pay Over Tax, or Attempt to Evade or Defeat Tax
A responsible person is anyone with authority to decide which bills get paid: owners, officers, controllers, and sometimes bookkeepers or accountants with check-signing authority. Your title doesn’t decide it; your actual control over the money does. This penalty pierces the corporation entirely. Personal bank accounts and homes become fair game, because the IRS treats those collected taxes as government money that was never yours to spend.
The statute requires willfulness, but courts read it broadly. You don’t need to intend to cheat the government. Knowing about the obligation and choosing to pay other creditors first is enough. Using collected excise taxes to cover payroll or rent instead of remitting them satisfies the standard.
Operating Without Required Registration
Before engaging in many excise-taxable activities — fuel blending, tire manufacturing, operating fuel terminals, selling alternative fuels, buying taxable goods for export or government resale, and dozens more — the IRS requires registration on Form 637.6Internal Revenue Service. Application for Registration (For Certain Excise Tax Activities)
Skipping that step is expensive. The initial failure costs $10,000 per activity, with an additional $1,000 for each day the failure continues.7Office of the Law Revision Counsel. 26 U.S.C. 6719 – Failure to Register or Reregister A fuel blender who doesn’t realize registration is required can accumulate tens of thousands in penalties inside a month. The only relief is reasonable cause, and for a business already operating in a regulated industry, that’s a difficult bar.
When Civil Penalties Become Criminal Charges
The IRS doesn’t pursue criminal cases often, but excise tax evasion is within reach. Willfully attempting to evade or defeat any tax is a felony under 26 U.S.C. § 7201, punishable by up to five years in prison and fines up to $100,000 for individuals or $500,000 for corporations, plus prosecution costs.8Office of the Law Revision Counsel. 26 U.S.C. 7201 – Attempt to Evade or Defeat Tax This is for the egregious cases: false returns, hidden income, destroyed records.
A step below that, willfully failing to file a return or supply required information is a misdemeanor under 26 U.S.C. § 7203, carrying up to one year in prison and fines up to $25,000 for individuals or $100,000 for corporations.9Office of the Law Revision Counsel. 26 U.S.C. 7203 – Willful Failure to File Return, Supply Information, or Pay Tax Willfulness is the pivot in both statutes. A genuine mistake or misunderstanding of a complex provision isn’t criminal. Deliberately ignoring a known filing obligation is.
Interest Runs on Everything Until You Pay
On top of every penalty, interest accrues on any unpaid balance from the original due date until the balance is paid in full.10Office of the Law Revision Counsel. 26 U.S.C. 6601 – Interest on Underpayment, Nonpayment, or Extensions of Time for Payment, of Tax The rate is the federal short-term rate plus three percentage points, adjusted quarterly.11Office of the Law Revision Counsel. 26 U.S.C. 6621 – Determination of Rate of Interest For the first quarter of 2026, that’s 7% for most taxpayers and 9% for large corporate underpayments.12Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 It compounds daily, so balances grow faster than most people expect.
How Far Back the IRS Can Go
The IRS generally has three years from the date a return was filed to assess additional excise tax.13Office of the Law Revision Counsel. 26 U.S.C. 6501 – Limitations on Assessment and Collection That window extends to six years if the return omits more than 25% of the tax that should have been reported.
Three situations remove any time limit at all:13Office of the Law Revision Counsel. 26 U.S.C. 6501 – Limitations on Assessment and Collection
- A fraudulent return filed with intent to evade tax
- A willful attempt to defeat the tax by any means
- No return filed at all — the clock never starts
That last point catches more excise tax filers than you’d expect. A business that never realized it had a quarterly filing obligation has no statute of limitations protection. The IRS can arrive years later, assess everything back to day one, and add penalties and interest for every intervening month.
Getting Penalties Reduced or Waived
The IRS can waive failure-to-file, failure-to-pay, and failure-to-deposit penalties when you show reasonable cause. The standard is whether you used ordinary business care — the diligence a reasonably prudent person would use — but were still unable to comply.14Internal Revenue Service. Penalty Handbook, Introduction and Penalty Relief Circumstances the IRS recognizes include:
- Serious illness or death of the taxpayer, a key employee responsible for filing, or an immediate family member
- Fire, natural disaster, or a similar event that destroyed records or blocked access to filing systems
- Inability to obtain records despite due diligence
- Good-faith reliance on a tax advisor after giving them accurate information
Forgetfulness, general ignorance of excise tax obligations, and delegating to an employee who dropped the ball typically don’t qualify. The IRS also weighs your compliance history over the prior three years and how quickly you fixed the problem after learning of it.
A separate administrative waiver, First Time Abate, is available to taxpayers with a clean three-year compliance history and covers failure-to-file, failure-to-pay, and failure-to-deposit penalties.15Internal Revenue Service. Administrative Penalty Relief It doesn’t apply to returns with event-based filing requirements, and some excise tax obligations may fall into that category. If your Form 720 filing is strictly quarterly, First Time Abate is worth requesting; confirm eligibility with a tax professional, since IRS guidance doesn’t explicitly address every excise tax scenario.