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:
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Your completed exemption certificate(s)
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Company name and billing address
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Humsienk account email (if existing customer)
*Processing time: 3-5 business days*
✅ Required Documentation by Entity Type
For Resellers / Wholesalers
Acceptable documents include:
Your certificate must include:
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Purchaser's name and address
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Seller's permit or tax ID number
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Description of items being purchased for resale
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Authorized signature and date
For Nonprofit Organizations
Required documents:
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IRS 501(c)(3) determination letter
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State-issued sales tax exemption certificate
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Completed exemption application form
Additional information needed:
For Government & Educational Entities
Required documents:
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Official tax-exempt letter on letterhead
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Government purchase order (if applicable)
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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:
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Account flagged as tax-exempt in our system
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Future orders placed under your account will automatically exclude sales tax
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Existing orders can be refunded for tax paid within the last 90 days
