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. Hands holding a tablet showing a e-invoice

    What is e-invoicing?

    Learn what e-invoicing is, why it’s mandatory in many countries, and how to implement it. Streamline compliance and get paid faster today.

  3. Illustration of europe

    The Rise of Digital Reporting Requirements in the EU

    Digital reporting requirements in the EU address the e-commerce boom and VAT gap. Here's what you need to know.

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

    What is Verifactu? Explained in English

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

  5. Illustration of Qoodle with a hat and keeping a calculator

    US Sales Tax Guide: Everything You Need to Know

    Whether you have a business in the US or you’re a remote seller with US customers, we’re here with a detailed Guide on US sales tax.

  6. Image of Qoodle resting

    How to Outsource Sales Tax Compliance for Startups

    Tired of tax headaches? Discover how outsourcing sales tax compliance saves time, reduces errors, and keeps your business audit-ready.

  7. Illustration of USA map showcasing the sales tax by state

    Sales tax by state: Rates and state-by-state guides

    Stay compliant with sales tax rules across the US. Learn about state & local rates, and how these impact your compliance.

  8. illustration of a computer using a SaaS solution

    10+ Most Useful SaaS Tools for Businesses in 2025

    Explore useful SaaS tools and unlock the advantages for your online business, from communications to HR, marketing to taxes.

  9. Illustration of Qoodle using a computer surrounded by 12 starts

    EU VAT for remote sellers

    Selling into the EU from abroad? Discover VAT rules for remote sellers, including thresholds, OSS schemes, and how to register hassle-free.

  10. Illustration of Europe with VAT numbers

    What is a VAT number?

    A VAT number identifies your business in Value-added Tax systems, such as EU VAT. Here's how the number works and whether or not you need one.

  11. 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.

  12. Illustration of a group of gears with the dollar symbol

    Finance Automation: How to optimize your financial workflows

    Automate financial processes to save time, cut costs, and reduce errors. Streamline reporting and compliance for online businesses, SaaS, and ecommerce.

  13. Illustration of Qoodle sliding in and arrow growing upward

    How to maximize small business tax deductions for financial growth

    Cut costs with smart tax deductions! Learn which expenses small businesses can deduct and how to maximize savings legally and easily.

  14. Illustration of Qoodle generating income and taxes

    Digital Tax Rules for Online Courses

    Selling courses online? Learn global tax rules for digital products, including VAT, GST, & sales tax, and how to stay compliant with ease.

  15. Illustration of a laptop with an awning

    Building Your 2025 Ecommerce Growth Strategy: The Ultimate Guide

    Unlock proven ecommerce growth strategies to attract more customers, boost sales, and scale globally without getting lost in tax complexity.

  16. Illustration of all the states in United States

    State-by-State Analysis: Sales Tax Compliance for Multistate Businesses

    Different rules for sales tax by state are hard to navigate when your business sells in multiple places! Learn how to stay tax compliant and save time.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  21. 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.