Quaderno helps you scale your business without stressing about taxes.

We provide the tools you need to automate tax compliance and sell anywhere online, including e-invoicing with one single API.

Tracking local tax registration thresholds and tax rates is tedious and time-consuming. Instead, focus on making sales while Quaderno ensures compliance with VAT, GST and other sales tax rules.

Fast track​

Understand Quaderno in 5 minutes!

1. Register for aSandbox account, and go to your profile to get yourAPI Keys.

2. Use our Tax API tocalculate tax on your checkout form:

curl https://sandbox-quadernoapp.com/api/tax_rates/calculate?to_country=US&to_postal_code=10128 \
  -u YOUR_API_KEY:x

3. Once you get paid via your favorite payment processor,record your sale with our Transactions API.

curl --request POST \
  --url https://ACCOUNT_NAME.sandbox-quadernoapp.com/api/transactions
  --header 'Authorization: Basic ENCODED_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "type": "sale",
  "currency": "GBP",
  "customer": {
    "first_name": "Alex",
    "last_name": "Wick",
    "street_line_1": "67 Church Lane",
    "city": "London",
    "postal_code": "E94 7RT",
    "country": "GB"
  },
  "items": [
    {
      "description": "Simple Software",
      "amount": 9.90,
      "tax": {
        "country": "GB",
        "rate": 20.0,
        "tax_code": "eservice".
      }
    }
  ],
  "payment": {
    "method": "credit_card",
    "processor": "yourPaymentProcessorName",
    "processor_id": "yourPaymentProcessorId1234"
  },
  "evidence": {
    "billing_country": "GB",
    "ip_address": "255.255.255.255",
    "bank_country": "GB"
  },
  "processor": “yourPlatformName",
  "processor_id": "yourPlatformTransactionId"
}'

4. Now a new invoice has been generated for your sale and yourtax reports have been updated and are ready to download.

Check ourGetting Started guide to learn more!

Quaderno API Features​

• Accuratetax calculation on every sale, worldwide
• Billing withautomatic tax-compliant invoices andcredit notes
• Webhook alerts for new tax obligations and registrations
• Taxreports by country or state
• Tax ID validation
• Quaderno Connect for building your own platform or marketplace
• Quaderno Checkout, if you don’t have your own checkout
• E-invoicing compliance with multiple countries, just with one API call.

Stay informed​

• Tax Made Simple, our tax newsletter
• Blog
• Status page
• Github