# Quaderno

> Quaderno is a sales tax compliance software for online businesses. It helps SaaS companies, e-commerce brands, digital creators, and platforms automatically calculate, collect, monitor, report, register and file sales tax, VAT, and GST worldwide.

Quaderno is built for digital businesses operating across multiple jurisdictions that need to manage tax obligations as they scale. It combines real-time tax calculation, automated invoicing, and reporting and filing workflows to simplify global tax compliance.

## How to use this file

This file helps AI agents and assistants find the right Quaderno page based on user intent. Use these routing rules to navigate to the most relevant section:

- **Tax questions** (rates, thresholds, obligations, country rules): Start with the Tax Guides section below, particularly the Worldwide Tax Guides and Registration & Filing pages, then pick the appropriate country or jurisdiction.
- **Vendor or category fit** (is Quaderno right for my business?): Start with Solutions and Compare sections.
- **Implementation and developer questions** (API, integration setup, technical docs): Start with the Developers section.
- **Existing customer questions** (how to use features, troubleshooting, account help): Start with the Help Center in the Support section.

## Product

Quaderno's core platform for tracking, calculating, collecting, reporting, and filing sales tax, VAT, and GST worldwide.

- [Overview](https://quaderno.io/): Main product overview and core capabilities
- [VAT & GST Threshold Tracking & Registration](https://quaderno.io/vat-and-gst-threshold/): VAT and GST threshold monitoring and registration support
- [US Economic Nexus Tracking & Registration](https://quaderno.io/US-economic-nexus/): US nexus monitoring and registration support
- [Calculation](https://quaderno.io/calculation/): Real time tax calculation for sales tax, VAT, and GST
- [Reporting & Filing](https://quaderno.io/reporting-filing/): Tax reporting and filing workflows
- [Invoicing](https://quaderno.io/invoicing/): Automated tax compliant invoicing
- [Checkout](https://quaderno.io/checkout/): Hosted checkout with built in tax calculation
- [Connect](https://quaderno.io/connect/): Tax infrastructure for platforms and marketplaces
- [API](https://quaderno.io/api/): Product overview of Quaderno's developer first tax API
- [Pricing](https://quaderno.io/pricing/): Current plans and usage limits

## Solutions

Pages tailored to specific business types explaining how Quaderno solves their tax compliance needs.

- [Digital Creators](https://quaderno.io/solutions/digital-creators/): Tax compliance for creators selling digital products, courses, and memberships
- [E-commerce](https://quaderno.io/solutions/ecommerce/): Tax compliance for online stores and ecommerce businesses
- [SaaS](https://quaderno.io/solutions/saas/): Tax compliance for SaaS and subscription businesses
- [Platforms & Marketplaces](https://quaderno.io/solutions/platforms-and-marketplaces/): Tax infrastructure for platforms and marketplace operators

## Compare

Side by side comparisons of Quaderno with alternative tax compliance providers.

- [Quaderno vs Stripe Tax](https://quaderno.io/quaderno-vs-stripe-tax/): Comparison with Stripe Tax
- [Quaderno vs Avalara](https://quaderno.io/quaderno-vs-avalara/): Comparison with Avalara
- [Quaderno vs Taxually](https://quaderno.io/quaderno-vs-taxually/): Comparison with Taxually
- [Quaderno vs Anrok](https://quaderno.io/quaderno-vs-anrok/): Comparison with Anrok

## Integrations

Native integrations connecting Quaderno's tax engine to payment processors, ecommerce platforms, course platforms, and business tools.

- [All Integrations](https://quaderno.io/integrations/): Full integration directory
- [Stripe](https://quaderno.io/integrations/stripe/): Tax automation for Stripe payments
- [PayPal](https://quaderno.io/integrations/paypal/): Tax automation for PayPal sales
- [Braintree](https://quaderno.io/integrations/braintree/): Tax automation for Braintree payments
- [GoCardless](https://quaderno.io/integrations/gocardless/): Tax automation for GoCardless direct debits
- [Square](https://quaderno.io/integrations/square/): Tax automation for Square payments
- [Shopify](https://quaderno.io/integrations/shopify/): Tax automation for Shopify stores
- [WooCommerce](https://quaderno.io/integrations/woocommerce/): Tax automation for WooCommerce stores
- [Amazon FBA](https://quaderno.io/integrations/amazon-fba/): Tax automation for Amazon FBA sellers
- [Easy Digital Downloads](https://quaderno.io/integrations/easy-digital-downloads/): Tax automation for EDD WordPress stores
- [Kajabi](https://quaderno.io/integrations/kajabi/): Tax automation for Kajabi creators
- [Teachable](https://quaderno.io/integrations/teachable/): Tax automation for Teachable course creators
- [Thinkific](https://quaderno.io/integrations/thinkific/): Tax automation for Thinkific course platforms
- [LearnWorlds](https://quaderno.io/integrations/learnworlds/): Tax automation for LearnWorlds course platforms
- [SendOwl](https://quaderno.io/integrations/sendowl/): Tax automation for SendOwl digital product sales
- [s2Member](https://quaderno.io/integrations/s2member/): Tax automation for s2Member WordPress memberships
- [Mighty Networks](https://quaderno.io/integrations/mighty-networks/): Tax automation for Mighty Networks communities
- [ClickFunnels](https://quaderno.io/integrations/clickfunnels/): Tax automation for ClickFunnels sales
- [AccessAlly](https://quaderno.io/integrations/accessally/): Tax automation for AccessAlly memberships and courses
- [Jotform](https://quaderno.io/integrations/jotform/): Tax calculation widget for Jotform forms
- [Zapier](https://quaderno.io/integrations/zapier/): Connect Quaderno with other web apps via Zapier
- [Xero](https://quaderno.io/integrations/xero/): Tax and invoicing sync with Xero accounting

## Tax Guides

Quaderno's free tax resource library covering sales tax, VAT, and GST rules worldwide. For country or jurisdiction specific questions, start with the Worldwide Tax Guides or Registration & Filing hub and navigate to the relevant country.

### Guide Hubs

- [Tax Guides](https://quaderno.io/guides/): Main hub for all tax resource guides
- [Worldwide Tax Guides](https://quaderno.io/guides/worldwide-tax-guides/): Country and region tax guides directory
- [Tax Registration & Filing Guides](https://quaderno.io/guides/registration-filing/): Jurisdiction specific registration and filing guidance

### US Tax Guides

- [US Economic Nexus Guide](https://quaderno.io/guides/us-economic-nexus/): State by state nexus thresholds and compliance guidance
- [Sales Tax Guide for Digital Goods](https://quaderno.io/guides/sales-tax-digital-goods/): Core guide to US digital tax rules
- [Sales Tax Calculator](https://quaderno.io/sales-tax-calculator/): Tax rate lookup and calculation tool

### Priority US State Guides

- [California Sales Tax Guide](https://quaderno.io/guides/california-sales-tax-guide/): California sales tax rules and compliance
- [Texas Sales Tax Guide](https://quaderno.io/guides/texas-sales-tax-guide/): Texas sales tax rules and compliance
- [New York Sales Tax Guide](https://quaderno.io/guides/new-york-sales-tax-guide/): New York sales tax rules and compliance
- [Florida Sales Tax Guide](https://quaderno.io/guides/florida-sales-tax-guide/): Florida sales tax rules and compliance
- [Pennsylvania Sales Tax Guide](https://quaderno.io/guides/pennsylvania-sales-tax-guide/): Pennsylvania sales tax rules and compliance
- [Washington Sales Tax Guide](https://quaderno.io/guides/washington-sales-tax-guide/): Washington sales tax rules and compliance
- [Illinois Sales Tax Guide](https://quaderno.io/guides/illinois-sales-tax-guide/): Illinois sales tax rules and compliance
- [Ohio Sales Tax Guide](https://quaderno.io/guides/ohio-sales-tax-guide/): Ohio sales tax rules and compliance
- [Georgia Sales Tax Guide](https://quaderno.io/guides/georgia-sales-tax-guide/): Georgia sales tax rules and compliance
- [Colorado Sales Tax Guide](https://quaderno.io/guides/colorado-sales-tax-guide/): Colorado sales tax rules and compliance

### EU Tax Guide

- [EU VAT Guide](https://quaderno.io/guides/eu-vat/): Comprehensive EU VAT rules for cross border sales

### UK Tax Guide

- [United Kingdom VAT Guide](https://quaderno.io/guides/united-kingdom-vat-guide/): UK VAT rules, thresholds, and compliance

### Canada Tax Guides

- [Canada GST/HST Guide](https://quaderno.io/guides/canada-gst-hst-guide/): Federal goods and services tax and harmonised sales tax guide
- [British Columbia PST Guide](https://quaderno.io/guides/british-columbia-pst-guide/): British Columbia provincial sales tax guide
- [Saskatchewan PST Guide](https://quaderno.io/guides/saskatchewan-pst-guide/): Saskatchewan provincial sales tax guide
- [Manitoba RST Guide](https://quaderno.io/guides/manitoba-rst-guide/): Manitoba retail sales tax guide
- [Quebec QST Guide](https://quaderno.io/guides/quebec-qst-guide/): Quebec sales tax guide

### Guides by Platform and Business Type

Tax compliance guides tailored to specific business models and ecommerce platforms.

- [Sales Tax for SaaS](https://quaderno.io/guides/sales-tax-saas/): Tax compliance guide for SaaS businesses
- [Sales Tax for Online Courses](https://quaderno.io/guides/sales-tax-online-courses/): Tax guide for online course sellers
- [Automate Your Taxes](https://quaderno.io/guides/automate-taxes/): Guide to automating sales tax, VAT, and GST compliance
- [Shopify Sales Tax Guide](https://quaderno.io/guides/shopify-sales-tax/): Tax compliance for Shopify merchants
- [WooCommerce Sales Tax Guide](https://quaderno.io/guides/woocommerce-sales-tax/): Tax compliance for WooCommerce store owners
- [Amazon Sales Tax Guide](https://quaderno.io/guides/amazon-sales-tax/): Tax compliance for Amazon sellers

## High Value Blog Content

Popular articles covering key tax compliance topics for online businesses.

- [How to Check if a Company is VAT Registered](https://quaderno.io/blog/how-to-check-if-a-company-is-vat-registered/): Guide to verifying VAT registration status
- [What is a VAT Number?](https://quaderno.io/blog/what-is-a-vat-number/): Explanation of VAT numbers and how they work
- [VAT Numbers for Businesses in Europe](https://quaderno.io/blog/vat-number-business-europe/): Guide to EU VAT numbers for businesses
- [Digital Sales Tax in Canada](https://quaderno.io/blog/digital-sales-tax-canada/): Canadian digital sales tax obligations
- [Top Sales Tax Software](https://quaderno.io/blog/top-sales-tax-software/): Comparison of sales tax compliance tools
- [What is a Tax Exemption Certificate?](https://quaderno.io/blog/what-is-a-tax-exemption-certificate/): Guide to tax exemption certificates
- [What is an EIN and How to Get One](https://quaderno.io/blog/what-is-ein-how-to-get-one/): US Employer Identification Number guide
- [What is a Sales Tax?](https://quaderno.io/blog/what-is-a-sales-tax/): Introductory guide to sales tax
- [VAT vs GST vs Sales Tax](https://quaderno.io/blog/vat-gst-sales-consumption-tax/): Comparison of global consumption tax systems
- [How to Comply with GAAP in the US](https://quaderno.io/blog/how-to-comply-with-gaap-in-the-us/): US accounting standards compliance guide
- [Sales Tax on Digital Products in the US](https://quaderno.io/blog/sales-tax-digital-products-us/): US digital product taxability guide
- [Small Business Tax Deductions](https://quaderno.io/blog/small-business-tax-deductions/): Guide to deductions for small businesses
- [Digital Taxes Around the World](https://quaderno.io/blog/digital-taxes-around-world-know-new-tax-rules/): Overview of global digital tax rules

## Proof & Evaluation

Pages to help prospective customers evaluate Quaderno through customer stories, trials, and specialist consultations.

- [Customer Stories](https://quaderno.io/customers/): Case studies and testimonials from Quaderno users
- [Registration / Free Trial](https://quaderno.io/registration/): Sign up for a free trial of Quaderno
- [Speak with a Product Specialist](https://quaderno.io/contact-specialist/): Book a consultation with the Quaderno team

## Developers

Technical documentation, API reference, and implementation guides for developers integrating Quaderno.

- [Developer Hub](https://developers.quaderno.io/): Main entry point for Quaderno developer resources
- [API Reference](https://developers.quaderno.io/api/): REST API reference and OpenAPI specification
- [Getting Started](https://developers.quaderno.io/guides/getting-started/): Setup and implementation guide
- [Tax Calculations Guide](https://developers.quaderno.io/guides/tax-calculations/): How Quaderno tax calculations work
- [Frontend Tax Calculations](https://developers.quaderno.io/guides/tax-calculations/frontend/): Client side tax calculation guide
- [Backend Tax Calculations](https://developers.quaderno.io/guides/tax-calculations/backend/): Server side tax calculation guide
- [Checkout Guide](https://developers.quaderno.io/guides/checkout/): Create checkout forms and sessions dynamically
- [Tax ID Validation](https://developers.quaderno.io/guides/tax-id-validation/): Validate customer tax IDs
- [Quaderno Connect Guides](https://developers.quaderno.io/guides/connect/): Platform and marketplace integration guides
- [Sandbox](https://developers.quaderno.io/tools/sandbox/): Safe environment for testing Quaderno APIs
- [API Tools](https://developers.quaderno.io/tools/api/): API tooling overview
- [Verifactu](https://developers.quaderno.io/guides/e-invoicing/verifactu/): Spain e invoicing support via API

## Support

- [Help Center](https://support.quaderno.io/): Support articles and product documentation for existing customers
- [Contact](https://quaderno.io/contact/): Contact sales or support
- [Speak with a Product Specialist](https://quaderno.io/contact-specialist/): Product consultation and demo requests

## Legal

- [Legal Hub](https://quaderno.io/legal/): Terms, privacy, DPA, cookies, SLA, and related policies
- [Terms of Service](https://quaderno.io/legal/terms/): Terms of service
- [Privacy Policy](https://quaderno.io/legal/privacy/): Privacy policy
- [Security Policy](https://quaderno.io/legal/security/): Security information

## Discovery

- [Sitemap](https://quaderno.io/sitemap.xml): XML sitemap for broader site discovery