The Quaderno blog

  1. 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.

  2. 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.

  3. 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.

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

    10 Best Sales Tax Software for Small Businesses (2026)

    Simplify compliance with the best sales tax software. Compare top tools to automate filing, reporting, and tax collection for your business.

  5. 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.

  6. 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.

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

    Automated Accounting for SaaS: Benefits, Tools & Setup

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

  8. 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.

  9. Hands holding a tablet showing a e-invoice

    E-Invoicing: What It Is, How It Works & EU Requirements

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

  10. 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.

  11. Illustration of a laptop with an awning

    Ecommerce Growth Strategy: 10 Tactics That Actually Work

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

  12. illustration of a computer using a SaaS solution

    10+ Most Useful SaaS Tools for Businesses in 2026

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

  13. 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.

  14. map of France

    E-invoicing in France & Digital Reporting Requirements

    France is mandating electronic invoicing, are you ready? Discover the rules, deadlines, and tools to stay compliant with French e-invoicing law.

  15. 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.

  16. Illustration of a laptop with different elements related to an online course.

    13 Top Course Creation Software To Try in 2026

    Looking to create and sell online courses? Compare top course creation software tools to find the best fit for building and scaling your business.

  17. map of Portugal

    E-invoicing in Portugal & Digital Reporting Requirements

    Portugal e-invoicing & digital reporting rules apply to all B2G businesses and some others. Learn about how electronic invoices work, when it’s required & how to comply.

  18. Illustration of an ecommerce and a globe

    Merchant of Record: Pros, Cons & When to Use One for SaaS

    Is a Merchant of Record (MoR) right for your business? Explore the pros, cons, and best use cases to see if this model fits your ecommerce strategy.

  19. image of an invoice transforming into bits

    E-invoicing in Spain & Digital Reporting Requirements

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

  20. 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.

  21. 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!