Invoice Duplicate in Poland (2026) — When and How to Issue
Invoice duplicate in 2026 in Poland. The difference between a duplicate and a copy, when to issue one, required elements, VAT, and the national e-invoicing system (KSeF). A practical guide with examples.
A client says they didn't receive your invoice? Or they lost the original? You need to issue a duplicate. But beware — a duplicate is not a copy. It's a separate document with its own requirements. And a naming mistake can cost you your VAT deduction.
In this guide, I explain the rules for invoice duplicates in Poland in 2026.
Duplicate vs. Copy — What's the Difference?
Invoice duplicate vs copy — what is the difference?
A duplicate is a full legal document replacing the original. A copy is just a reproduced document with no legal force. Learn the key differences for accounting and taxes.
Replaces a lost or destroyed original invoice. It has the same legal force.
- ✓Legal document replacing the original
- ✓Mandatory word „DUPLIKAT"
- ✓Date of issue of the duplicate
- ✓Reference to the original invoice number
- ✓Full accounting and tax force
It is simply a reproduced original. It does not replace an invoice or constitute an accounting document.
- ✗Regular print / scan / photo
- ✗May contain seller data (NIP)
- ✗Not a legal document
- ✗Does not entitle to VAT deduction or cost
Full comparison
| Feature | Duplicate | Copy |
|---|---|---|
| Legal status | Legal document | No legal force |
| Word „DUPLIKAT" | Mandatory | Absent |
| Date of issue | New duplicate date | Original date |
| Reference to original | Original invoice number | Absent |
| VAT deduction | Yes | No |
| Accounting | Yes — full document | No |
Key rule: An invoice duplicate must contain the word „DUPLIKAT", the date of its issue, and a reference to the original invoice number. Without these elements, the document is not a duplicate — only a copy with no legal force.
Lost an invoice or received a copy instead of a duplicate?
I can help →Information based on Art. 106m of the VAT Act and accounting regulations. An invoice duplicate is issued at the request of the buyer or in case of loss of the original.
Invoice Copy
A copy is simply a reproduction of the original invoice. It has no legal force — it is not an accounting document.
Invoice Duplicate
A duplicate is a document that replaces the original in legal and accounting circulation. It carries the same force as the original.
When to Issue a Duplicate?
You issue a duplicate when:
- The original was lost or destroyed
- The client did not receive the invoice
- The client requests a re-issue annotated as "duplicate"
Deadline
There is no statutory deadline — you issue it at the client's request. But as quickly as possible, so the client can deduct VAT and book the cost.
What Must a Duplicate Contain?
A duplicate must contain all elements of the original plus:
- The word "DUPLICATE" on the document
- The date of issue of the duplicate
- The original invoice number (which the duplicate is linked to)
- All data from the original invoice (seller, buyer, amounts, VAT)
Example:
DUPLICATE
Invoice no. FV/2026/0123 (original dated 15.01.2026)
Duplicate issue date: 20.07.2026
Seller: [data]
Buyer: [data]
Line items: [same as original]
Amount: 5,000 zł net + 1,150 zł VAT = 6,150 zł gross
Duplicate and VAT
A duplicate has the same force for VAT as the original:
- Seller: does not file a correction — VAT was already settled with the original
- Buyer: may deduct VAT from the duplicate (if they did not deduct from the original)
Duplicate and the National E-Invoicing System (KSeF)
From 2027 onward (for micro and small businesses), domestic invoices flow through the national e-invoicing system (KSeF). A KSeF invoice duplicate:
- If the original was in KSeF — the duplicate should also be marked in the system
- The KSeF number of the duplicate may be linked to the original
- A duplicate does not generate a new VAT obligation — it is a replacement document
Most Common Mistakes
1. Issuing a Copy Instead of a Duplicate
A copy is not an accounting document. The buyer cannot deduct VAT from a copy.
2. Missing the Word "DUPLICATE"
Without this annotation, the document is treated as another invoice — resulting in double VAT settlement.
3. Different Amounts Than the Original
A duplicate must have identical amounts to the original. If amounts differ — it's a correction (FK), not a duplicate.
4. Missing Duplicate Issue Date
The duplicate's date must be visible — for VAT and PIT (personal income tax) purposes.
FAQ
Can I issue a duplicate after a year?
Yes. There is no deadline. But the client may have trouble deducting VAT (3-year deadline).
Does a duplicate generate new VAT?
No. VAT was settled with the original. A duplicate is only a replacement document.
Is a duplicate chargeable?
It depends on your agreement with the client. Usually free, but some accountants charge a fee.
Is a KSeF invoice duplicate different?
Yes, in the national e-invoicing system (KSeF), a duplicate may be marked as linked to the original (same KSeF number).
Need Help with Invoices?
I run sole proprietorship (JDG) accounting with full invoice handling — issuing, duplicates, corrections, and the national e-invoicing system (KSeF). From 49 zł + VAT per month.
Reply to [email protected] or visit oxyok.com/pl.
Note: An invoice duplicate replaces the original in accounting circulation. It must contain the word "DUPLICATE", the issue date, and the original number. Before making a decision, consult an accountant.
Questions about accounting?
I run accounting for sole proprietors from 49 zł + VAT per month.
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