Tax-exempt for schools / churches, certificate upload + state matrix?

Schools (K, 12 + universities), churches, non-profits, and government buyers are a meaningful B2B slice for musical instrument retailers, especially band/orchestra instruments and pro audio for worship sound. Done right, this can be 15-30% of revenue with materially higher AOV (a school buying 30 violins).

Magento mechanics:

• Customer group: Tax-Exempt. Tax rules zero out sales tax for customers in this group. Application requires uploading state-specific resale / exemption certificate.
• Certificate upload UI in customer account, PDF upload, admin reviews + approves + assigns to customer group, sets expiry date (typically 1-3 years).
• Annual re-verification cron, 60 days before expiry, send Klaviyo email asking customer to upload renewed cert. If not received by expiry, customer drops back to standard tax-charged group.
• Audit log of every tax-exempt order, date, customer, cert on file at time of order, jurisdiction, tax amount that would have been charged. Required by most state revenue departments for sales-tax-exempt audit defense.
• Avalara AvaTax or TaxJar for the per-state nexus calculation, necessary at $1M+ revenue across states. ~$200, $2,500/mo depending on transaction volume.
• Net-30 + PO-number checkout via Apruve, Resolve, or TreviPay so the school can issue a purchase order and pay 30 days later. They underwrite the credit and pay you on day 1.

State matrix: every state has a different form. The big ones, Texas Form 01-339, California BOE-230, New York ST-120, Florida DR-13, cover ~60% of K, 12 buyers. Build a per-state form-name + reference link into the upload UI so the buyer knows exactly what to send.

This setup cuts customer-service load on tax disputes ~80% in my data.