Document organization is the foundation of efficient accounting. Sending correct documents on time to your accountant ensures compliance with legal deadlines, avoids penalties, and enables informed management decisions.
1. Mandatory Monthly Documents
Purchase and Sales Invoices
Sales invoices issued - all invoices, receipts and debit/credit notes
Purchase invoices received - suppliers, services, consumables
Professional service invoices - lawyers, consultants, technicians
Bank Documents
Complete bank statements - all company accounts
Transfer confirmations - supplier payments and client receipts
Credit card statements - business card expenses
Personnel Documents
Payslips - salary processing
Employment contracts - new hires
Social Security communications - admissions and terminations
2. Recommended Submission Deadlines
Timely submission allows your accountant to process VAT (20th for monthly regime) and other tax obligations without delays.
3. How to Organize Documents
Create monthly folders on computer or cloud
Use consistent naming: YYYY-MM_DocumentType_Supplier
Digitize paper documents with good resolution
Legal Sources and References
CIRC - Corporate Income Tax Code
CIVA - VAT Code
Portuguese Labour Code
Last updated: January 2026
Key Takeaways
Send documents by 5th-10th of the following month to meet tax deadlines
Mandatory documents: invoices, bank statements, payslips
Organize digitally with monthly folders and consistent naming
Keep all documents for 10 years as required by law
Avoid penalties: incomplete documents can cost up to €3,750
FAQ
What documents should I send monthly to my accountant?
You should send sales and purchase invoices, bank statements from all accounts, personnel documents (payslips, contracts), payment confirmations and expense reports with supporting documentation.
What is the ideal deadline for sending documents?
The ideal deadline is by the 5th of the following month, with maximum deadline on the 10th. This allows the accountant to process VAT and other tax obligations on time.
How long should I keep documents?
You must keep all documents for 10 years, as established in the VAT Code and Corporate Tax Code.
What are the consequences of not sending documents on time?
Delays can make it impossible to meet tax deadlines, result in fines from €150 to €3,750, and prevent VAT deduction on undocumented purchases.
How should I organize documents digitally?
Create monthly folders, use consistent naming (YYYY-MM_DocumentType_Supplier), digitize with good resolution and use secure sharing portals.