The Quaderno blog

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. Illustration of Europe representing EU digital reporting requirements

    E-Reporting in the EU: Digital Reporting Requirements

    E-reporting sends transaction data straight to a tax authority, with no invoice involved. Here is how it works, which European countries require it, and what changes in 2030.

  17. map of France

    E-invoicing in France: requirements and deadlines for the September 2026 mandate

    France's B2B e-invoicing mandate starts on 1 September 2026. Here's who has to receive, who has to issue, what counts as an electronic invoice, and how the approved platforms work.

  18. 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.

  19. 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.

  20. 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.

  21. 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.