Sales Tax Exemption Application

Qualified businesses and organizations can purchase Humsienk energy storage products without paying sales tax. Complete the application below to have tax-exempt status applied to your account.

📋 Do You Qualify for Sales Tax Exemption?

You may qualify for tax-exempt purchasing if your organization falls into one of these categories:

Entity Type Description Common Documentation
Resellers / Wholesalers Businesses that purchase products for resale Resale certificate / Seller's permit 
Nonprofit Organizations 501(c)(3) charitable, religious, or educational organizations IRS determination letter + state exemption certificate 
Government Agencies Federal, state, or local government entities Government purchase order / tax-exempt letter
Educational Institutions Schools, universities, and qualified educational facilities State-issued exemption certificate 
Manufacturers Businesses purchasing products used directly in manufacturing Manufacturing exemption certificate 

📝 How to Apply

Option A: Apply Online (Fastest)

Complete our secure online exemption application:

[Start Online Application →]

*Processing time: 2-3 business days*

Option B: Email Your Documents

Send completed exemption certificates to: service@humsienk.com

Please include:

  • Your completed exemption certificate(s)

  • Company name and billing address

  • Humsienk account email (if existing customer)

*Processing time: 3-5 business days*

✅ Required Documentation by Entity Type

For Resellers / Wholesalers

Acceptable documents include:

  • State-issued Resale Certificate / Seller's Permit 

  • Uniform Sales & Use Tax Resale Certificate - Multi-jurisdiction (for multi-state resellers) 

  • Streamlined Sales Tax Exemption Certificate (for SST member states) 

Your certificate must include:

  • Purchaser's name and address

  • Seller's permit or tax ID number

  • Description of items being purchased for resale

  • Authorized signature and date 

For Nonprofit Organizations

Required documents:

  • IRS 501(c)(3) determination letter

  • State-issued sales tax exemption certificate 

  • Completed exemption application form

Additional information needed:

  • Federal Employer Identification Number (FEIN)

  • Proof of compliance with state charity registration (if required) 

For Government & Educational Entities

Required documents:

  • Official tax-exempt letter on letterhead

  • Government purchase order (if applicable)

  • State-issued exemption certificate

📍 State-by-State Certificate Acceptance

We accept exemption certificates from all U.S. states. Below are common certificate forms by state:

State Accepted Forms
California Form BOE-230 (Resale Certificate) 
Texas Texas Sales and Use Tax Resale Certificate
Florida Annual Resale Certificate 
New York Form ST-120 (Resale Certificate)
Multi-State Uniform Sales & Use Tax Certificate (accepted in 36+ states) 

Not sure which form to use? 

Contact your state's Department of Revenue for assistance.

🔄 How It Works

Once your exemption application is approved:

  1. Account flagged as tax-exempt in our system

  2. Future orders placed under your account will automatically exclude sales tax

  3. Existing orders can be refunded for tax paid within the last 90 days