Superior Industrial Supply's St. Louis warehouse
Become a Customer

Set Up an Account, Not a Hassle

Fill out a credit application, attach the right tax form if you qualify for an exemption, and you’re set — most accounts are reviewed within a few business days.

How It Works

Four Steps to an Open Account

  • 1
    Download the Credit ApplicationFill it out completely — an officer of the company must sign it.
  • 2
    Attach Your Exemption CertificateIf you’re sales tax exempt, include the correct completed form (see below).
  • 3
    Email It to SalesSend the completed application to sales@sisupply.com.
  • 4
    Account Review & SetupWe’ll follow up directly once your account is ready to go.

Step 1

Credit Application

Two pages — company info, A/P contact, officers/principals, and bank/trade references. An officer signature is required.

Superior Industrial Supply Credit Application Fillable PDF — company, billing/shipping, A/P contact, and reference sections.
Download Application

Completed applications go to sales@sisupply.com.

Step 2 (If Applicable)

Sales Tax Exemption Forms

If your purchases qualify for a sales tax exemption, include the form that matches your situation. Not sure which one applies? Ask your rep — we’ll point you to the right one.

Missouri Form 149 — Sales/Use Tax Exemption Certificate

For Missouri-based resale, manufacturing, and wholesale exemptions — covers ingredient/component parts, manufacturing machinery, and several other exemption categories.

Download Form 149
Illinois CRT-61 — Certificate of Resale

For Illinois purchasers buying tangible property for resale — retailers and registered resellers.

Download CRT-61
Illinois ST-587 — Equipment Exemption Certificate

For equipment used primarily in manufacturing, production agriculture, graphic arts production, or coal and aggregate mining.

Download ST-587
Illinois RUT-7 — Rolling Stock Certification

For interstate carriers for hire purchasing motor vehicles, trailers, aircraft, watercraft, or repair/replacement parts used as rolling stock.

Download RUT-7

Questions Before You Apply?

A local rep can walk you through which forms you actually need.