Transparent Statutory Architecture Disclosure: US state revenue departments do not offer a unified 50-state real-time open API. Under US sales tax audit standards, the seller's statutory safe-harbor ("good-faith acceptance") requires archiving a completed, buyer-signed MTC Uniform Sales & Use Tax Certificate or Streamlined Sales Tax (SST) Form F0003 with structural State Permit ID format validation, ESIGN Act (15 U.S.C. § 7001) electronic signature capture, 7-year retention, and strict checkout
shippingProvinceCode nexus enforcement.
Sign & Archive US B2B Resale Exemption Certificate
Validates 38+ US State Permit IDs, captures live mouse/touch signature strokes, seals with SHA-256, and generates a 7-Year Audit PDF.
Captured Stroke Points: 0
Ready to validate State Permit ID and capture ESIGN signature strokes.
Checkout Shipping-State Nexus Lock Simulator
Prevents B2B buyers from using a signed resale certificate in one state (e.g., TX) to evade sales tax on shipments delivered to an uncovered state (e.g., CA or NY).
Click "Test Checkout State Nexus Lock" to run server-side Wasm & API validation.
Archived US MTC / SST Certificates (7-Year Vault)
| Cert ID | Buyer & State | Form & Permit | Audit PDF |
|---|
US B2B Tax Exemption & Resale Certificate Vault — Pricing Tiers (USD)
Free Tier
$0/mo
Up to 3 active signed certificates · 38+ state permit format checks · Manual PDF export.
Starter
$19/mo
Up to 50 active signed certificates · ESIGN Canvas Pad + SHA-256 7-year archive · 48h grace window.
Pro (Most Popular)
$49/mo
Up to 500 active certificates · Automated 30-day & 7-day FL DR-13 / annual renewal alerts · Wasm State Lock.
Plus Multi-Store
$99/mo
Up to 2,500 active certificates · Shopify Plus Checkout UI Extension · Up to 5 stores.
Australia ABR 11-Digit ABN Modulo-89 & ATO GSTR 2013/1 Tax Invoice
Verifies 11-digit Australian Business Numbers via official ABR Modulo-89 weights, checks New Zealand 13-digit NZBNs, enforces ≥ A$82.50 Tax Invoice and ≥ A$1,000 buyer identity thresholds, and flags 47% No-ABN PAYG Withholding risk.
Enter an 11-digit Australian ABN to run Modulo-89 verification and ATO GSTR 2013/1 compliance checks.
Australian ATO GSTR 2013/1 Statutory Rules & Pricing
47% No-ABN PAYG Withholding Guard (TAA 1953 Sch 1 s 12-190): When an Australian B2B supply exceeds
A$75.00 (excluding GST) — i.e., A$82.50 GST-inclusive — and no valid 11-digit ABN is quoted, business payers face mandatory 47% PAYG withholding obligations and loss of GST input tax credits.
- ≥ A$82.50 (incl. GST): Supplier must issue a compliant
TAX INVOICEwithin 28 days displaying 11-digit ABN and exact1/11thGST amount. - ≥ A$1,000.00 (incl. GST): Tier-2 ATO rule requires both Supplier ABN and Buyer Legal Identity or Buyer 11-digit ABN on the face of the Tax Invoice.
- Non-GST Registered Suppliers: Forbidden from titling documents
TAX INVOICE; must issue a regularINVOICEstating "No GST has been charged". - Exports outside Australia (s 38-185): Zero-rated
EXPORT TAX INVOICE (GST-FREE)when goods leave Australia within 60 days.
Free / Starter
$0 / $12/mo
5 free checks/mo · $12 Starter unlocks 100 ABN & NZBN checks/mo.
Pro / Plus
$29 / $49/mo
Unlimited ABR checks + ATO GSTR 2013/1 Tax Invoice PDFs + up to 3 stores ($49).