The Quaderno blog

  1. 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.

  2. 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

    Spain's Verifactu system, explained for a business that is not Spanish: who it reaches, the 2027 dates, and how it fits the other regimes you already handle.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. Illustration of a tax engine applying sales tax, VAT and GST rules to an online sale

    What is a tax engine? How tax determination software works

    What a tax engine works out on every sale, what it needs from you, what it hands back, and how to tell whether your business has reached the point where one is worth paying for.

  11. Comparison of excise tax and sales tax showing who pays and who remits each

    Excise Tax vs Sales Tax: What Sellers Need to Know

    Excise tax targets specific goods and usually lands on the manufacturer. Sales tax applies broadly and lands on you. Here's which one your business actually has to collect.

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. Qoodle working on the computer

    10 financial tips for online creators

    Discover 10 essential financial tips for online creators, from managing taxes and expenses to automating invoicing and building long-term financial security.

  17. 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.

  18. Qoodle reviewing a comparison chart of the best sales tax software options

    Best Sales Tax Software in 2026: 10 Tools Compared

    A comparison of ten sales tax compliance platforms, with 2026 pricing verified against each vendor's own page, what every tool refuses to do, and the state-funded program that makes filing free in 24 states.

  19. Image of Qoodle behind an invoice

    What Is a Tax Invoice? Requirements, Formats & Compliance

    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.

  20. Border between two countries with cross-border e-commerce shipping, payment and tax icons

    Cross-border e-commerce: shipping, duties and tax explained

    Cross-border e-commerce means selling to customers in another country, and in 2026 the rules changed. Here is how shipping, customs duties, import VAT and tax compliance actually work.

  21. Qoodle resting while bots run an automated accounting system in the background

    Automated Accounting Systems for SaaS: Tools & Setup

    Recurring billing, multi-currency sales and multi-jurisdiction tax create more entries than any team can key in by hand. Here is how to automate the chain.