We already had the data and the logic, so it only made sense to close the loop and handle the paperwork too.
Massive shout-out to my team for moving fast to make this happen. You guys are rockstars! 🙌
We realized that in 2026, just calculating tax isn't enough. You don't want another dashboard to manage; you want the peace of mind that the job is actually done.
So, we built it. Automated registration and filing are now live. 🚀
Big news: We’re officially taking tax filing off your plate. 🥂
Lately, we’ve been hearing the same thing from founders and finance teams: "Quaderno, the data is perfect... but we’re still stuck doing the actual filing. It's a headache."
If you want your business to feel lighter and more scalable, start building it like software.
Not as a collection of tasks, but as a system that runs predictably, even when you are not watching.
Engineering taught me that complexity is optional.
Automation is not about scaling output. It is about scaling trust.
This mindset creates stability, efficiency, and scale.
It is not cold or robotic. It is respectful of everyone’s time.
It gives the team clarity. It gives the product consistency.
And it gives me the confidence to grow without losing control.
Running a company like an engineer has changed everything for me:
- Clear processes instead of improvised firefighting
- Automated flows instead of manual busywork
- Documented rules instead of random exceptions
- Data-based decisions instead of intuition-based debates
I don’t run my company on intuition. I run it like software.
Most founders make decisions based on gut feeling, opinions, or “what feels right in the moment.” That works in the early days. But intuition doesn’t scale.
As a developer and entrepreneur, I have learned that responsibility is not just about paying taxes on time. It is about anticipating what the system will demand and building with enough clarity to scale without fear.
Regulation does not have to be a burden. Handled correctly, it can be your moat.
Looking ahead to 2026 and beyond, I see three things:
• Real-time taxes will be normal, not exceptional
• Compliance architecture will influence product architecture
• Regulation will become a competitive moat for founders who prepare early
You need to understand regulation to innovate. Waiting for accountants or third parties to explain the law will slow you down. The future favors technically literate entrepreneurs who can interpret regulation, design systems around it, and ship with confidence.
Verifactu has been postponed. Again. Many people see this as “more time to relax,” but it just delays inevitable change and creates a false sense of security. The companies preparing now will win. The ones waiting for the deadline will panic later when the transition is harder and more expensive.
E-invoicing, Peppol, Verifactu, and other upcoming EU requirements are not temporary changes. They are the first steps toward a future where business data flows directly to the tax authorities as it is generated.
Most founders react to regulation when it arrives. The problem is that by the time it arrives, it is already too late to adapt without pain.
Spain is often seen as a difficult place to build SaaS. My experience has been different. If you understand the rules and design your systems correctly, Spain can be a very strong base to grow from.
Bootstrapping shaped my mindset, my decision-making, and my leadership. It pushed me to think long term, to build solid foundations, and to treat operational discipline as a competitive advantage.
I have seen venture-backed companies move very fast in the beginning, only to slow down later because they accumulated compliance debt. Fixing tax and invoicing issues once the company is already scaling is far more expensive than doing it right early on.
When you bootstrap, you cannot afford vague processes or “we’ll fix it later” thinking. Every decision has consequences. That pressure forces better systems from the start. You design operations and compliance to work properly because you do not have the luxury of throwing money at the problem later
Bootstrapping isn’t slower. It’s more intentional.
When people talk about bootstrapping, they usually focus on money. In reality, the biggest difference is control over decisions.
That matters a lot when you are building a SaaS business in a regulated environment like Spain.
The SaaS companies that scale internationally without constant friction are not the ones that ignore compliance. They’re the ones who plan for it early.
Despite what some people think, compliance-first SaaS scales faster 🚀
When tax logic and e-invoicing are built properly from the start, they stop being a burden. They become a source of confidence for founders, for customers, and for partners.
I’ve seen SaaS companies grow fast only to slow down later because their invoicing and tax setup wasn’t designed for multiple countries, different VAT rules, or regulatory changes. Fixing that after the fact is expensive, stressful, and risky.
Taxes and e-invoicing are not paperwork. They are infrastructure. And just like bad technical architecture, bad tax architecture doesn’t fail immediately; it fails when you try to scale.
Most SaaS founders think taxes and invoicing are a back-office problem. Something to deal with “later”, once the product is working and growth kicks in. In my experience, that mindset breaks companies 💥
Sí, me pasé hace un año. La uso simplemente para guardar mi lista de pendientes y registrar los ya leídos. Está muy bien.
Por la misma razón por la que otros nos mudamos a Fable: fable.co. Para intentar no compartirlo todo con Amazon, que ya bastantes datos tienen.
📣 Big announcement: Quaderno is now featured on the #WooCommerce Marketplace!
Our plugin simplifies global tax compliance with automated calculations, reporting, plus registration & filing services.
Check it out: https://woocommerce.com/products/quaderno/
No lo podría definir mejor.
Para colmo, los autónomos, que son los que más se han quejado, tenían de plazo hasta julio. Pero en lugar de explicarlo bien, han decidido alargar la agonía un año más. ¿O alguno piensa que los que no han hecho nada hasta ahora van a tenerlo todo listo antes de 2027?
La paradoja es que todos los fabricantes están preparados desde julio y los usuarios de programas de facturación solo tenían que subir su certificado y hacer clic en un botón para activar el nuevo sistema. Ese era todo el esfuerzo que había que hacer.
