The Quaderno blog

  1. Illustration of Qoodle investigating some footprints

    What is a sales tax audit and how to prepare for one

    Learn what happens during a sales tax audit, why states conduct them, and how to prepare your business with proper record-keeping and compliance strategies.

  2. illustration of a stamp

    What is a tax exemption certificate (and does it expire)?

    Discover what a tax exemption certificate is, who qualifies, and how businesses can issue and manage them for tax compliance.

  3. Illustration of Qoodle carrying the European flag with the text VAT

    How to get a VAT number in Europe

    Do you need a VAT ID number in Europe? Learn how to register, when it’s required, and how to stay compliant while selling across the EU.

  4. Image of Qoodle behind an invoice

    What is a tax invoice?

    What is a tax invoice and why is it required? Learn the key elements, when to issue one, and how to simplify invoicing for VAT, GST & sales tax compliance.

  5. Image of a list of product tax codes

    What are product tax codes in the US?

    What are product tax codes (PTCs) and why do they matter? Learn how tax codes affect rates, compliance, and smooth checkout for your business.

  6. Illustration of an invoice

    The Most Common Types of Invoices for Your Business

    Confused about invoices? Discover the most common types of invoices, when to use each, and how they simplify payments and tax compliance.

  7. Qoodle shows a diagram of how the Merchant of Record process works.

    Becoming a Merchant of Record marketplace: Why and Why Not

    Learn what a Merchant of Record is and the pros & cons for online marketplaces. Learn about risks, responsibilities, and alternative strategies.

  8. Image of Qoodle resting while some bots runs the benefits

    What is Automated Accounting? Benefits and Best Practices

    Discover how automated accounting saves time, reduces errors, and keeps finances accurate. Choose tools to streamline your financial management today.

  9. Illustration of qoodle automating the invoice generation

    How to Automate Your Invoices

    Learn how to automate invoices to cut manual work, prevent errors, and get paid faster. Discover simple tools to streamline billing and boost efficiency today.

  10. Illustration of a sales tax label and a calculator

    What is a sales tax deduction?

    Learn how sales tax deductions work, who qualifies, and see real-life examples to help you save money on your tax return with eligible purchases.

  11. Laptop with Canadian leaf with percentage symbol

    Canada's Digital Services Tax: A Comprehensive Guide to DST

    Explore Canada's Digital Services Tax (DST) with our guide. Learn what digital services revenue is taxed and who's affected.

  12. A store managing taxes between the user and household

    What is indirect tax? A practical guide for small businesses

    Learn how indirect taxes like sales tax, VAT, and GST affect pricing and compliance, plus tips to stay compliant worldwide and automate with Quaderno.

  13. Illustration of USA map showcasing the best states to form an LLC

    Best states to form an LLC and how to do it

    Discover the cheapest state to form an LLC and the best states to form an LLC for tax purposes, asset protection, and other business-friendly rules.

  14. Illustration of Qoodle with small robots notifying about some alerts

    How to remind clients to pay: payment reminder messages

    Payment reminder messages, especially when automated with the right tools, can work wonders for your cash flow, productivity, and profitability.

  15. Illustration of difference of an excise tax from a sales tax

    How is an excise tax different from a sales tax?

    Compare excise tax vs. sales tax to learn the how an excise tax is different from sales tax in the US.

  16. Illustration of a coin in transfer

    How the Central Electronic System of Payment Information (CESOP) affects online businesses

    The VAT CESOP Directive, or Central Electronic System of Payment Information, helps the EU enforce VAT rules. Here’s how it will affect remote sellers!

  17. Image of Qoodle jumping with a resale certificate

    What is a resale certificate?

    A resale certificate or reseller’s permit allows your business to make tax-free purchases if you resell the goods. Here’s everything you need to know.

  18. Image of a border between countries and icons related to e-commerce

    Cross-border Ecommerce: How to do it right

    Learn how to execute cross-border ecommerce with tips on growth strategies, market advantages, and solutions for shipping, payments, and tax compliance.

  19. Illustration of Qoodle verifying some VAT numbers

    How to check if a company is VAT registered

    Learn how to check if a company is VAT registered in countries around the world by using VAT lookup tools or tax compliance automation software.

  20. How to calculate sales tax as a remote seller

    Remote seller sales tax guide 2026: Nexus and calculation

    Just because you are a remote seller doesn't mean you are off the hook when it comes to taxes. Learn how to calculate US sales tax as a remote seller!

  21. Global E-Commerce Taxes Without The Chaos

    Global e-commerce tax compliance: Scale international sales

    Looking to scale globally without tax headaches? Learn global e-commerce tax compliance, including VAT, GST, OSS/IOSS, and economic nexus for online sellers.