Sales Tax Exemption Applicable Only to Official Website Purchases

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:

📝 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:

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