Form 637 – Application for Excise Tax Registration (Fillable PDF)

Form 637, Application for Registration (For Certain Excise Tax Activities), is the IRS’s official request to register for activities subject to federal excise taxes. Whether you are a manufacturer, importer, fuel seller, or any other entity that handles taxable products, you need this form to stay compliant.

On Formize.com you can fill the form directly in the browser—no PDF editor required. Just click the Fill out this form button, let the Formize PDF Filler load, and start entering your information.

Who Must File Form 637

• Manufacturers, producers, or importers of excise‑taxed products.
• Sellers or purchasers of taxable fuel.
• Exporters of excise‑taxed goods.
• Any entity using products that require a Certificate of Registration.

How to Complete Form 637 Online

Follow these simple steps to finish the application without printing a single page:

1. Click the Fill out this form button on this page.
2. Wait for the Formize PDF Filler to load (usually a few seconds).
3. Enter your legal name, EIN, trade name, and contact information.
4. Select the appropriate activity letter (M, S, etc.) and provide a brief description.
5. Answer the general information questions in Part III.
6. Upload any required supporting documents directly in the filler.
7. Review the completed form, then click Submit to download a signed PDF or mail it to the IRS address shown in the instructions.

Common Mistakes & Tips

• Incorrect EIN: Double‑check the number; a typo will delay approval.
• Missing activity letter: Use the chart on pages 2‑5 of the form to pick the right letter.
• Skipping supporting documents: Attach licenses, permits, or prior registration letters as required.
• Out‑of‑date form: Always use the latest PDF – the link below points to the current IRS version.

Download the Fillable PDF

If you prefer to work offline, you can download the official PDF from the IRS and open it with any PDF editor. However, the online filler is faster, error‑proof, and saves you a trip to the printer.

FAQs About Form 637

Below are the most frequently asked questions. Click each question to see the answer.