Introduction: Invoice Archiving Regulations in Poland

Every entrepreneur, regardless of company size, must know how long to keep invoices. This is not a matter of organization — it is a legal requirement under income tax and VAT laws. Improper archiving can result in fines of up to 30,000 PLN.

In the digital age and with mandatory KSeF, a new question arises: how to archive electronic documents? In the cloud? Locally? Is a screenshot enough? This article answers all your questions.

Basic Rule: 5 Years of Retention

The regulations are clear: invoices must be retained for 5 years. However, this does not mean 5 years from invoice issuance. The period is calculated differently.

When does the 5-year count begin?

The 5-year period is counted from the end of the calendar year in which the tax payment deadline expired for that invoice. In practice:

Does the rule apply to paper and electronic invoices?

Yes. Both paper and electronic invoices must be retained for 5 years. Regulations do not differentiate by document format — what matters is that it be accessible and readable.

KSeF and Invoice Retention — 10 Years of Security

The implementation of mandatory KSeF changed the approach to archiving. KSeF retains invoices much longer than the law requires.

How long does KSeF store invoices?

The KSeF system stores all invoices for 10 years from the date of issuance. This gives businesses an additional safety margin beyond the required 5 years.

What happens after 10 years in KSeF?

After 10 years, invoices are removed from the public KSeF server. If you need access to older documents, you must:

• Request archival access from podatki.gov.pl
• Maintain your own copies from when they were available
• Request a certified copy from podatki.gov.pl (sometimes possible)

Archiving Methods — Where to Store Electronic Invoices?

Regulations do not mandate a specific archiving method. You can choose from several solutions or combine them.

Option 1: KSeF — The Default Archiving System

• Advantages: Free, automatic, government server, 24/7 access, 10-year retention
• Disadvantages: After 10 years invoices may be inaccessible

Option 2: Cloud — Google Drive, OneDrive, Dropbox

• Advantages: Access from anywhere, automatic backups, low cost (10–50 PLN/month)
• Disadvantages: Depends on third party, requires subscription

Option 3: Local Server or Hard Drive

• Advantages: Complete control, no subscription costs
• Disadvantages: Risk of data loss, no remote access

Option 4: Accounting System — Enova, iSeria, Sage

• Advantages: Automation, tax reports, KSeF integration
• Disadvantages: Higher cost (100–500 PLN/month)

Practical Archiving Tips

1. File Organization

Structure invoices by year and month: 2026/01, 2026/02, 2026/03, etc. This makes retrieval easier during audits.

2. File Format

• PDF — universal, supported on every device
• XML (KSeF format) — official format, stored automatically
• JPG/PNG — if scanning — requires high resolution (minimum 300 DPI)

3. Backup — Never Just One Copy

• KSeF + cloud (Google Drive + OneDrive)
• Local drive + external hard drive
• Accounting system + cloud storage

4. Access and Readability

• High-resolution scans (if paper)
• Stable file format
• Access to reading software (PDF is universal)

Supporting Documents — What Else Must Be Archived?

• Client Contracts: 5 years from end of contract year
• Payment Proof: Bank statements — 5 years
• VAT Documents: VAT declarations, JPK_V7M — 5 years
• HR/Payroll Documents: Work cards — 7 years
• Delivery Confirmations: Shipping lists — 5 years

Scanning Paper Invoices — Can I Delete Them?

Many businesses scan paper invoices to save space. This is allowed if conditions are met.

Scanning Requirements

• Resolution: Minimum 300 DPI
• Format: PDF preferred, JPG/PNG acceptable
• Readability: All data clearly visible
• Integrity: File must not be editable
• Security: Password protection recommended

How to Practically Scan Invoices?

• Use a scanner or camera (300 DPI minimum)
• Save as PDF (phone app like Adobe Scan)
• Name logically: F-2026-01-001.pdf
• Archive by year and month
• Retain scan for 5 years
• Dispose of paper (preferably shredded)

FAQ: Invoice Archiving — Common Questions

Is the 5-year count from invoice issuance or payment?

From the end of the year in which the tax payment deadline expired.

Can I delete invoices from over 6 years ago?

Yes, if exactly 5 years have passed from the end of the year. Wait until 6 years for safety.

Is archiving only in KSeF sufficient?

For electronic invoices in KSeF — yes. For paper invoices — you must maintain your own archive.

Can I scan invoices at low resolution?

Technically possible, but risky. Always 300 DPI minimum.

What happens if I lose invoices?

Missing documentation is serious violation. Can result in fines (up to 30,000 PLN) and claims from authorities.