KSeF in a restaurant: an obligation that keeps itself

How do you connect KSeF in 15 minutes?

1. 1You sign in to KSeFTo your own company account, exactly as always.
2. 2You grant permissionRead access to purchase invoices only. Owlly issues nothing on your behalf.
3. 3You paste the tokenOne field in Owlly’s settings. From that moment invoices arrive on their own, every hour.

What is KSeF, and who in hospitality does it apply to?

The National e-Invoice System (Krajowy System e-Faktur, KSeF) is a central invoice database run by the Polish Ministry of Finance. An invoice is no longer a file your supplier sends you — it is a structured document the supplier places in the system and you collect from there.

It applies to every business registered for VAT, which in hospitality means practically everyone: restaurants, pizzerias, cafés, bars, caterers and food trucks. It makes no difference whether you have one venue or fifteen, or whether you trade as a sole trader or a company.

For a kitchen the consequence that matters is this: purchase invoices from your suppliers — the wholesaler, the butcher, the greengrocer, the drinks supplier — reach KSeF automatically, at the moment they are issued. You do not have to wait for them, ask for a duplicate, or hunt for them in email. They are there before the driver has pulled away from your door.

That changes the nature of the problem. For years the hardest part of computing costs was GETTING the documents. From 2026 the documents are given — the difficulty moves to understanding them.

What penalties apply from 2027?

From 1 January 2027 the tax authorities may impose financial sanctions for failing to meet KSeF obligations — among them, not issuing an invoice in the system where that was required.

We do not quote specific amounts or ranges here. They depend on the nature of the breach and on the authority’s decision, and copying figures circulating online would mislead you on exactly the point where you most need reliable information. If you need a concrete answer for your situation, ask your accountant or your tax office.

What we can say with confidence: preparing takes a quarter of an hour, and putting it off buys you nothing. Quite the opposite — supplier price history only builds with time, so a venue connected in September enters 2027 with four months of data that a venue connected in December will have nowhere to get.

How do you connect a venue to KSeF, step by step?

You need access to your company’s KSeF account — the same one your accountant uses. The whole thing takes about fifteen minutes and needs nobody’s technical help.

You sign in to KSeF and generate a token with READ access to purchase invoices. You do not grant issuing rights — Owlly does not need them and will not use them.

You paste the token into one field in Owlly’s settings. From that moment purchase invoices are pulled automatically, every hour.

Owlly also pulls the preceding months, so price history starts not from the day you connected but from whatever KSeF already holds. That is why the first report tends to be more interesting than anyone expects.

If you have several venues, each branch can carry its own tax identity or inherit head office’s — connections are routed accordingly and invoices land in the right branch.

Does KSeF cover receipts and invoices issued against a receipt?

Fiscal receipts do not go to KSeF. Consumer sales are settled through the fiscal till and stay that way — fiscalisation, the printer and daily reports all work unchanged.

An invoice issued against a receipt, which a guest asks for on behalf of their company, is different. That is a sales invoice and follows the same rules as the rest.

For most hospitality venues the practical consequence is small, because such invoices are a minor share of sales. It is worth checking how your till or accounting software handles the case — that is a question for your till vendor, not for a cost system.

What does KSeF give you beyond the obligation?

This is the part almost nobody writes about, and for a restaurant it matters more than compliance itself.

KSeF delivers EVERY cost invoice, not only the ones for food. Electricity, rent, cleaning chemicals, laundry, waste collection, insurance, the coffee machine lease, subscriptions. Everything your business buys on an invoice appears in one place, in the same structure, on the same day.

A restaurant that connects KSeF for the obligation gets its entire cost base as a side effect — something that previously could not be assembled without retyping two binders a month. Suddenly questions that used to be theoretical become answerable: what electricity really costs per złoty of revenue, whether cleaning chemicals are growing faster than turnover, what the venue’s full fixed cost for the month actually is.

That is why we treat KSeF not as a compliance module next to other integrations, but as the source everything else stands on. It shows in how it is built: the import runs hourly, each connection has its own lock, so a manual import and the schedule cannot collide and pull the same document twice. At night a separate pass walks the time window again and closes whatever the cursor may have missed. And a separate check catches connections that have had nothing come through them for days — because an expired token looks exactly like a quiet week with no deliveries, and that is the failure you find out about last.

Competitors treat KSeF as one accounting integration among many. For Owlly it is the foundation — and that is where the difference in how far you can rely on this data comes from.