The Quaderno blog

  1. Illustration of US showcasing weather icons with percentage symbols

    How the Wayfair Decision on US Sales Tax Will Affect Your Business?

    The Wayfair decision revolutionizes online sales tax in the US with new economic nexus laws. Here's what you need to know.

  2. 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.

  3. 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.

  4. map of France

    E-invoicing in France & Digital Reporting Requirements

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

  5. 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.

  6. Illustration of a SaaS Income Statement with coins

    What should a SaaS income statement look like in 2025?

    Building the financial statements for a SaaS business is unique. Learn how to structure a SaaS income statement for your company.

  7. Illustration of an ecommerce on a mobile screen

    An Introduction to Online Marketplace VAT Rules

    Online marketplace VAT comprehensive guide. Unlock the fundamentals of how VAT applies to eCommerce and the tax compliance criteria for a seamless process.

  8. An illustration of a pile of papers

    What is accrual accounting and how is it beneficial for SaaS?

    Accrual accounting is a necessary business practice for SaaS and subscription models, along with MRR and revenue recognition. Learn why it’s so important.

  9. Illustration of Qoodle starting a new online business

    How to Start an Online Business in 2025

    Want to start a business online? Learn how to start an online business, from concept to launch, and turn your idea into a successful brand!

  10. Illustration of Qoodle calculating Irish VAT OSS

    What is a VAT OSS return and how to submit It as an Irish (Non-EU) business?

    Follow these steps to submit a VAT OSS Return in Ireland as a Non-EU Business and make your EU VAT returns easier.

  11. Illustration representing an ecommerce

    What is distance selling? How it works in the EU

    Distance selling in the EU must follow specific rules and e-commerce tax regulations. Here’s how to make sure your contracts and EU VAT are 100% compliant!

  12. 16 Best SaaS Marketing Strategies for Success in 2025

    The SaaS landscape is always changing. Here are the best SaaS marketing strategies for this year, explained with pros, cons and how-to instructions.

  13. Step by step Sales Tax guide

    Sales Tax, VAT & GST Compliance Guide for Digital Consultants in 2025

    Master sales tax (state-by-state), VAT (EU), and GST (global) compliance for consulting services. Learn tools to automate tax collection and filings.

  14. Imagen representing the connection of Amazon with Europe

    How Amazon FBA affects your EU VAT obligations

    EU VAT obligations are complicated for Amazon FBA sellers. Learn about e-commerce VAT rules, when Amazon is responsible, and how your business can comply.

  15. Illustration of a laptop with sales tax return notification

    How to prepare a sales tax return

    File returns and claim sales tax deductions in just minutes. These accounting and reporting tips will help you prepare and declare US sales tax returns quickly.

  16. Illustration of 2 calendars

    One-time vs. recurring payments: Key differences and how to choose

    Compare one-time and recurring payment models, their pros/cons, and actionable tips to pick the best option for your business.

  17. Illustration representing a cloud service with digital product icons.

    What are digital products?

    Explore the world of digital products with our comprehensive guide. Learn key definitions, selling tips, and tax compliance strategies to boost your online business.

  18. Illustration of all the states in United States

    Sales Tax Nexus: A Complete Guide to Types, Laws, and Compliance

    What is sales tax nexus? Learn the types (economic, physical, affiliate), how to determine nexus, and steps to comply with US sales tax laws.

  19. Imagen representing the connection of Amazon with USA

    Amazon FBA sales tax guide: Compliance, nexus, and deductions

    Learn how Amazon FBA sales tax works, including nexus laws, tax filing (1099-K), deductions, and tools to automate compliance.

  20. Illustration of How Do You Calculate Sales Tax if You’re a Remote Seller?.png

    How to calculate Sales Tax as a remote seller in 2025: A step-by-step guide

    Just because you are a remote seller doesn't mean you are off the hook when it comes to taxes. Learn how to calculate US sales tax as a remote seller!

  21. Illustration of Qoodle and a ecommerce in the USA

    How to Comply with E-Commerce Sales Tax

    Sales tax for eCommerce might seem complicated, but we'll give you the knowledge to succeed: what tax nexus is and how to comply for US Sales tax.