IRS Form 637 (Application for Registration for Certain Excise Tax Activities) Fax Number
Where and How to Fax a 637 Form?
IRS Form 637 is an application businesses use to register for specific tax activities involving excise taxes. It helps the IRS track entities that engage in certain manufacturing, selling, or importing processes related to excise-taxed goods and services.
What is an IRS Form 637?
Form 637 is used to apply for registration under the Internal Revenue Code for activities that involve excise taxes. These include activities like producing or selling fuel, chemicals, or ozone-depleting substances, among others. Registration via this form is required before engaging in these excise-related activities, and it ensures the IRS has accurate records for tax compliance and monitoring.
IRS Form 637 Fax Numbers
Form 637 has one nationwide fax number, the same number applies regardless of which Activity Letter you're registering for or which state you're in.
- 855-887-7735: All U.S. states and territories
How to Fax Your Form 637 Registration to the IRS
Form 637 has to reach the IRS's Excise Operations Unit before you can legally begin the activity you're registering for, and the IRS reviews every application before approving it, sometimes including an unannounced inspection of your business premises. Faxing through Fax.Plus gets your application there immediately with a timestamped delivery confirmation, rather than waiting on mail to Cincinnati, OH.
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Why do you need an IRS Form 637?
You need Form 637 to:
- Legally conduct excise-taxable activities (e.g., fuel production, chemical sales)
- Claim exemptions from excise tax where allowed
- Avoid penalties for unregistered activities
- Ensure compliance with IRS regulations under Subtitle D of the Internal Revenue Code
Failure to register properly can result in denied claims, assessed penalties, and inability to operate in excise-tax-regulated industries.
Who needs to file an IRS Form 637?
You need to file Form 637 if you're engaging in activities requiring excise tax registration, including but not limited to:
- Manufacturers or importers of fuels or chemicals
- Sellers or blenders of fuel (including biodiesel, diesel, and kerosene)
- Producers or sellers of ozone-depleting chemicals
- Exporters of taxed goods
- Taxable fuel registrants
- Persons claiming certain excise tax exemptions
- Air transportation providers
Each registrant applies under a specific "Activity Letter" (e.g., Activity Letter M for blenders of gasoline, diesel, or kerosene), depending on the business activity. The current form lists 31 active Activity Letters in total.
What are Activity Letters on Form 637, and how many are there?
Activity Letters identify which specific excise-tax activity you're registering for, such as M for blending gasoline, diesel, or kerosene, or V for exporting ozone-depleting chemicals. The current form lists 31 active Activity Letters, and you can register for more than one on a single Form 637 if you engage in multiple qualifying activities.
How long does it take to get approved after filing Form 637?
The IRS doesn't publish a fixed timeframe. Your application is reviewed before any registration takes effect, and the review can include an unannounced inspection of your business premises during normal business hours. Once approved, you'll receive a Letter of Registration, a copy of Form 637 itself is not proof of registration.
What happens if I operate without registering under Form 637?
If you're required to register and don't, the IRS penalty is $10,000 for the initial failure, plus $1,000 for each additional day you remain unregistered, unless the failure is due to reasonable cause. You can check whether a business currently holds a valid registration using the IRS's online Form 637 status tool.
Does a Form 637 registration expire or need to be renewed?
No fixed expiration. Once you hold an active Certificate of Registry or Letter of Registration, you don't need to reapply unless the IRS asks you to. You do need to notify the IRS within 10 days of any change to the information you submitted, and fuel registrants under section 4101 must reregister if more than 50% of the business's ownership changes hands.
Do I still need to file Form 720 if I have a Form 637 registration?
Yes, they're separate obligations. Form 637 registers you for an excise-tax activity or exemption, it doesn't replace your ongoing tax filings. If you're liable for excise tax, you still file Form 720, the Quarterly Federal Excise Tax Return, on its normal schedule, Form 637 itself asks whether you already file or expect to file Form 720.
Registering for excise tax activities rarely happens in isolation. Here's what else comes up around IRS filings, tax compliance, and third-party fax submissions.
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DISCLAIMER: The information on this site is for general information purposes only, and Alohi cannot guarantee that all the information on this site is current or accurate. This is not intended to be legal, accounting or tax advice and should not be a substitute for professional legal, accounting or tax advice. For legal advice, consult a licensed attorney regarding your specific legal questions.
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