Receipt or invoice? Receipts with your NIP, the 450 PLN rule, and KSeF

In 2026, a till receipt that shows your NIP (your tax number) counts as an invoice for purchases up to 450 PLN gross. For anything larger, ask the shop for an invoice, and give your NIP before the receipt is printed. From 1 January 2027 that shortcut ends: a receipt with your NIP is no longer an invoice, and a shop selling to a business issues the invoice in KSeF, the national e-invoicing system.

When a receipt with your NIP is enough

A paragon fiskalny is the receipt a cash register prints. A paragon z NIP is the same receipt with the buyer’s NIP printed on it, because you gave the number at the till. Up to 450 PLN gross (or 100 EUR, when the amount is in euros), the VAT Act treats it as a faktura uproszczona, a simplified invoice.

So for a business purchase, the receipt does the job of an invoice. It names the seller, it shows your NIP, and your accountant can book it.

The NIP has to be on the receipt itself, so say it (or show it) before the cashier finishes the sale. A note on your phone helps. If you are unsure which number is which, see NIP, REGON and PESEL explained.

Tip: since 1 February 2026 a business buyer must give its NIP to the seller when an invoice is issued to it. That is also how an invoice reaches your KSeF account, so put your NIP in every online shop account too.

Above 450 PLN: ask for an invoice

Above 450 PLN gross, a receipt with your NIP is still useful, but it is not an invoice. Ask the shop for an invoice. Until 31 December 2026, the shop may issue it from its cash register (outside KSeF) or in KSeF.

In practice:

1. Give your NIP at the till.
2. Say you need an invoice (faktura), and check that your business name and NIP on it are right.
3. Keep the invoice in that month’s folder, with the receipt if you get it back. The shop may keep the paper receipt with its own copy of the invoice, or only note the receipt’s number.

Forgot your NIP? The shop cannot fix it later

This rule catches most people. If a sale went through the cash register and the receipt does not show your NIP, the seller may not issue an invoice to your business afterwards. A seller who does risks an additional tax of 100% of the VAT on that invoice, so a careful shop will refuse. The one exception in the law is taxis (not car hire with a driver).

So “receipt now, invoice later” only works if your NIP is already on the receipt. Once you have left with a plain receipt, it is too late. If a document is missing altogether, see what to do about a lost invoice.

Does a receipt count as a cost?

It depends on how you pay income tax. If you have not chosen yet, see how to choose your tax form.

Tax scale and flat tax (liniowy). You record costs in the KPiR (podatkowa księga przychodów i rozchodów, the tax book of revenue and expenses). The regulation on the KPiR accepts invoices and a short list of other documents. A document other than an invoice must reliably identify the issuer or the parties, and show the date, what was bought and its value. A plain receipt names the shop but not your business, and it is not signed, so it is widely treated as not enough on its own. We found no official guidance on how strictly tax offices apply this, so do not rely on a plain receipt: give your NIP.

Ryczałt (the lump-sum tax on revenue) taxes your revenue, not your profit, so no cost lowers it, whether you have a receipt or an invoice. Keep your purchase documents anyway: the ryczałt Act requires you to keep proof of the goods you buy, and if you are an active VAT payer the VAT on them still matters.

Tip: fuel or oil bought abroad is one of the narrow exceptions in the KPiR rules. A foreign till receipt is accepted if it shows the date, the seller, the quantity, the unit price and the value, and you write your name (or business name), your address and what was bought on the back.

What changes on 1 January 2027

Every business has had to receive invoices through KSeF since 1 February 2026. It has also had to issue its invoices to other businesses there since 1 April 2026 (the largest businesses since 1 February). Until 31 December 2026 a few things may still stay outside: invoices from small sellers who invoice no more than 10,000 PLN gross a month, invoices issued from a cash register, and receipts with a NIP.

From 2027, a receipt with your NIP stays a receipt. The invoice you need for the business arrives in KSeF, where you, your software or your accountant can download it. Two habits stay the same in both years: give your NIP at the till, and check that the invoice arrived. KSeF sends no notifications. The wider picture is in KSeF explained and what KSeF won’t collect.

Watch out: invoices to consumers stay voluntary in KSeF, and an invoice to a sole trader for a private purchase counts as one. If the purchase is for your business, say so and give your NIP.

Thermal receipts that fade

Most receipts are printed on thermal paper, and many are unreadable within months. You keep tax documents until the tax can no longer be collected: 5 years from the end of the year in which the tax was due. For a sole trader, 2026 documents belong to the annual return due on 30 April 2027, so they are kept until 31 December 2032. The VAT Act also asks that the invoices you receive stay legible and authentic for that whole time.

A simple routine covers it:

1. Photograph or scan the receipt the same day, flat and in good light, so the NIP, date and amount are readable.
2. Name the file so it can be found: 2026-09-14 Orlen 212.40 PLN.jpg.
3. Keep the paper in an envelope for that month, away from heat and sunlight.

The law does not plainly say that a photo can replace the paper original. Keep both until your accountant, or KIS (Krajowa Informacja Skarbowa, the tax information helpline), tells you otherwise. More in how long to keep documents.

Komplet, our free Mac app, reads a photographed or scanned receipt on your Mac with on-device OCR, picks out the seller, NIP, date and amount, and files it into the right month under a readable name.

What to do next

1. Save your NIP on your phone so you can show it at any till.
2. Up to 450 PLN: give your NIP, keep the receipt. Above 450 PLN: give your NIP and ask for an invoice.
3. Photograph every receipt the same day and keep the paper in that month’s envelope.
4. On ryczałt, keep the receipts anyway, especially if you are an active VAT payer.
5. Before 1 January 2027, check that you, your software or your accountant can see the invoices sent to your NIP in KSeF.