The Quaderno blog

  1. E-Invoicing & Data Security. Best practices for global VAT/GST compliance

    E-invoicing compliance: Six best practices for global VAT/GST data security

    Master e-invoicing compliance with six proven best practices for encryption, API security, and data retention across global VAT/GST systems.

  2. Shopify Tax: Does Shopify handle tax filing

    Shopify tax: Does Shopify handle sales tax filing?

    Learn if Shopify Tax handles filing. Understand nexus, registration, and how to automate sales tax for your Shopify store in 2026.

  3. 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.

  4. Illustration of a diagram showing a shop receiving money from a company and a user

    Input VAT vs Output VAT: What's the Difference?

    Input VAT vs. output VAT determines your VAT return and how much money you claim. Learn the differences for your business!

  5. Qoodle working on the computer

    How to calculate sales tax in Excel

    Learn how to calculate sales tax in Excel using formulas and examples, avoid common errors, and automate your tax workflows for accuracy and compliance.

  6. Illustration of a map of the US representing which states do not have sales tax

    The NOMAD states: Which states don't have sales tax?

    Discover which US states don’t have sales tax. Learn about the NOMAD states, their tax structures, and how to stay compliant when doing business there.

  7. Qoodle peeking out from behind a flag that is half US and half UK, with the word Verifactu in the middle.

    What Is Verifactu? Spain's 2027 E-Invoicing Law Explained

    Learn about Spain's Verifactu e-reporting laws, how it relates to e-invoicing, and how businesses can comply.

  8. Illustration of Germany with e-invoicing

    Germany E-invoicing & Digital Reporting Requirements

    German e-invoicing & e-reporting rules apply to all B2B businesses. Learn about how electronic invoices work, when it’s required & how to comply.

  9. 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.

  10. 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.

  11. 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.

  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 UK map with the UK VAT document

    UK VAT codes: A complete guide

    Learn UK VAT codes for Standard, Reduced, Zero Rate, and Exempt products. This guide helps you comply with HMRC & optimize your tax management.

  14. Three houses with an ascending arrow

    What is scaling in business? Scaling strategy for beginners

    Master business scaling: learn sustainable strategies, optimize processes, and balance growth with core values for startup success.

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

    Best States to Form an LLC in 2026 (Tax & Cost Breakdown)

    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.

  16. 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.

  17. Illustration representing a tax engine

    What is a tax engine?

    Discover how tax engine software simplifies compliance across global tax jurisdictions, ensuring your business's efficiency and growth.

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

    Excise Tax vs Sales Tax: Key Differences Explained

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

  19. Illustration of Qoodle giving a presentation about Tax tips

    6 tax tips for small business owners in 2026

    Discover essential tax tips for small business owners in 2026! Stay compliant, maximize credits, automate processes, and save money with strategic planning and software tools.

  20. Image of Qoodle surprised with a wrong tax rate

    UK VAT error correction and when to use Form 652

    Discover when to use Form 652 for UK VAT error correction. Correct errors timely to avoid penalties, and learn the process to ensure compliance with HMRC.

  21. 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.