As published, Portugal's monthly Billing SAF-T(PT) submission to the Autoridade Tributária has applied since 2013, one of Europe's longest-running periodic e-invoicing-adjacent requirements, with the deadline currently the 5th of the following month (moved from the 12th). ATCUD, a unique validation code combining an AT-issued code with a sequential invoice number, has been mandatory on invoices since 1 January 2023. A separate, broader full SAF-T Accounting file requirement is also expected, though its start year has moved in recent budget proposals and should be confirmed directly (as published — confirm current requirements with your adviser).
LATYNEX Digital builds the workflow around the billing data your certified invoicing software turns into the monthly SAF-T(PT) file. This page covers it for Porto businesses. The general service is at Workflow Automation & Systems Integration, and the market overview is at LATYNEX Digital for businesses in Porto. Delivery is in English, and this page names no client.
Typical industries
- Small and mid-sized retailers and service businesses
- Wholesalers and distributors invoicing domestic B2B customers
- Non-resident VAT-registered businesses billing Portuguese customers
- Finance and back-office teams preparing monthly billing data
- Businesses replacing a manual pre-submission review with a checked one
Common lead-handling problems
- Sales recorded in a spreadsheet or ERP export, then re-keyed into certified billing software
- ATCUD codes applied inconsistently across invoice series
- No record of which invoices a monthly SAF-T(PT) export excluded, or why
- A missing field found only after the 5th-of-month deadline has passed
- No internal owner for the monthly billing-data review before export
Direct answer
If your Porto business submits monthly SAF-T(PT) billing files, LATYNEX can build a workflow that turns your existing sales or billing records into one clean data set, checks ATCUD codes and required fields against what your certified billing software expects, and gives every exception an owner before the monthly deadline.
Why the global page and the Porto hub are not enough
The global Workflow Automation & Systems Integration page has no monthly statutory export to design against, and the Porto hub is broad discovery for the market. Here the design point is that this obligation has run since 2013 with a tightening deadline, so the review has to happen before the 5th of the month, not after a late or incomplete export is discovered.
What we configure and build
The work sits before your certified billing software's SAF-T(PT) export, not in place of it.
- A billing data workflow pulling from your existing sales, invoicing or ERP records
- Field and ATCUD checks against what your certified billing software confirms it needs
- A monthly pre-deadline review queue, with an owner and a status
- A history of what was reviewed, when, and what was corrected before export
- A written handover once the workflow is running
What stays with you, your certified software and your accountant
Generating and submitting the SAF-T(PT) file, and any dealings with the Autoridade Tributária, stay with your certified billing software and your accountant. Whether your billing data meets current requirements is for you and your adviser; we prepare and check the underlying data, we do not generate or submit the SAF-T file ourselves.
What needs API support or custom scope
LATYNEX claims no Autoridade Tributária accreditation and does not act as certified billing software. Any connection to your certified software, ERP or accounting system is scoped per project through the documented API or export format if access is permitted, after technical review.
What we do not do, and where LATYNEX is not the right fit
LATYNEX does not give tax or legal advice, does not generate or submit the SAF-T(PT) file, does not say a submission is compliant, and holds no Portuguese tax-authority accreditation. It has no Porto office or named clients, and delivery is in English only. If your certified billing software already produces a clean monthly SAF-T(PT) export, this page is not for you.
How delivery actually works
LATYNEX Digital has no office in Porto and does not claim one. We work with Porto businesses remotely, over video calls and written updates, in English, with the same team and process as in every other market.
Questions
Do you have an office in Porto?+
No. We work with businesses in Porto remotely, over video calls and written updates, in English, and we do not imply a local presence.
Do you generate or submit our SAF-T(PT) file?+
No. Generating and submitting the file stay with your certified billing software and your accountant. We prepare and check the underlying billing data beforehand.
What is ATCUD, and since when is it required?+
As published, ATCUD is a unique validation code combining an AT-issued code with a sequential invoice number, mandatory on invoices since 1 January 2023.
What is the monthly SAF-T(PT) billing deadline?+
As published, the current deadline is the 5th of the month following the reporting period, moved from the 12th. Confirm the current deadline with your adviser, as this has changed before.
Does this make our billing data compliant?+
No. We give no tax or legal advice and cannot say your billing data meets requirements. Confirm current requirements with your adviser; we build to the fields they and your certified software specify.
How are you invoiced, and in what currency?+
In EUR, by Latynex Trade OÜ, a company registered in Estonia (EU). Tax treatment for a client in Portugal is confirmed on the quote, and we do not give tax advice.
What happens next
- 01
We map the process and the tools
Where the work starts, what is done by hand, which systems are involved.
- 02
We pick the simplest reliable route
A platform, a workflow or a little custom code — whichever is simplest and safest for this outcome.
- 03
Scope and price in writing
One scope and one price for you to approve. Nothing starts before you agree.
- 04
We build it with failure handling
Retries, duplicate protection and a named person told when something breaks, in accounts you own.
- 05
Test, monitor, hand over
We check it against real cases, agree who watches it, and document how it works and what to do when it fails.
Who you would be working with
- Company · Who you would be working with
- LATYNEX Digital is a service line of Latynex Trade OÜ, a company registered in Estonia (EU). Contact: info@latynexdigital.com.
- How we work · Delivery
- Remote, in English, with the person who would run the project. No local office is implied in any market.
- How we work · Commercial terms
- One scope and one price, agreed in writing before work starts. Your accounts, code and domain stay yours; any access we use is granted by you and can be withdrawn.
There are no client case studies on this page, and none are implied. What LATYNEX has built and runs itself is on the portfolio, each system labelled by stage. Published prices are on the pricing page; anything not listed there is scoped and quoted after review.