Invoice automation after KSeF: what to automate in 2026 and where OCR still helps

KSeF, Poland’s National e-Invoicing System, is a government platform through which companies issue and receive invoices. Each invoice in it is an XML file: a set of data in fixed fields that software can read without human involvement. KSeF works like a shared mailbox run by the Ministry of Finance, in which every invoice gets its own number.

The obligation came in two stages. Since 1 February 2026, all taxpayers have received invoices through KSeF, and companies with 2024 sales above PLN 200 million including VAT have also issued them there. From 1 April 2026, issuing invoices in KSeF became mandatory for everyone else, including VAT-exempt taxpayers.

Transitional relief applies until the end of 2026. A company may issue invoices the old way as long as their total value including VAT in a given month does not exceed PLN 10,000. Once it goes over the limit, it loses this right, starting with the invoice that crossed the threshold.

Penalties are a separate matter. Under current law, the financial penalties in Article 106ni of the VAT Act apply from 1 January 2027. The Ministry of Finance has announced a one-year postponement, but this requires a new act and does not change the obligation itself.

An invoice from a Polish supplier no longer lands as a PDF in the accounts department’s shared inbox. It appears in KSeF and has to be downloaded from there – manually in the Ministry of Finance app or automatically by the accounting system.

The moment of receipt has also changed. It is the moment KSeF assigns the invoice a number, not the day someone in the company opens it. An invoice can therefore be formally received even though nobody has seen it yet.

KSeF checks that the file matches the required format and that the issuer is authorised. It does not check the calculations or the buyer’s details. A wrong amount, an incorrect VAT rate or an invoice made out to the wrong company will pass through the system unchallenged.

The supplier still gives the invoice its own number, and KSeF adds a second, system number. You need both in your accounting system, because the KSeF number is required in JPK_VAT and, from 2027, also in split payment transfers. A split payment is a transfer in which the VAT goes to a separate account of the supplier.

Connecting your accounting system to KSeF meets the legal obligation, but on its own it does not reduce the workload. The time goes on the steps that follow: assigning the cost, collecting approvals, paying and archiving. This is where KSeF data gives you an advantage, because it no longer has to be read from an image.

The Polish VAT white list is a public register of VAT taxpayers and their bank accounts, kept by the National Revenue Administration (KAS). If you pay more than PLN 15,000 for a transaction into an account that is not on the list, there are two risks. You may lose the right to treat the expense as a tax-deductible cost, and you may become jointly liable for the supplier’s VAT. Filing a ZAW-NR notification with the tax office on time protects you from this.

Checking every account by hand across several hundred transfers a month is tedious, and it is easy to miss one. A system can do it for every payment batch and hold back only the transfers that need a decision.

From 1 January 2027, split payment transfers must quote the KSeF number instead of the invoice number. If you pay several invoices with one transfer, you use a collective identifier generated in KSeF. It is worth checking now whether your payment system and bank support these fields.

OCR is technology that reads text from a scan or photo, much as a person would copy data from a sheet of paper. Before KSeF, it was the basis of purchase invoice automation. Today it handles a smaller share of documents, but that share will not disappear.

Before you choose a tool, count the documents in the list below. With a few dozen PDFs a month, the data capture built into your accounting system or the AI Builder module in Power Automate is usually enough. A full document processing platform makes sense when you have a large number of foreign invoices or employee expenses.

KSeF has not replaced JPK. The JPK_VAT file (the Polish SAF-T VAT file) with the VAT return is still submitted separately every month or quarter. However, since 1 February 2026 it has had a new structure that links the VAT records to KSeF.

Each invoice in the sales and purchase VAT records must show its KSeF number. If an invoice does not have one, you enter one of three markers described in the Ministry of Finance table. JPK_FA files are no longer submitted for invoices issued in KSeF.

The simplest check before submitting JPK is to compare the list of purchase invoices in KSeF with the VAT register. An invoice that is in KSeF but not in your books is either a lost cost or an invoice that should never have reached you. The system can run this check every day rather than just before the JPK deadline.

When it comes to issuing invoices, automation is usually built into the sales system or ERP. It is still worth checking how the software handles unusual situations, because that is where errors happen.

A good system keeps track of the deadlines described below on its own: it stores invoices issued without a connection to KSeF and sends them once the system is working again. Also set up an alert to the accounts team for every file KSeF rejects. A rejected invoice has not been issued, and the customer may not know.

Take a hypothetical manufacturing company with 120 employees that receives 600 purchase invoices a month. Assume that 540 arrive through KSeF and 60 are foreign invoices or other documents outside the system.

As a rough estimate, assume it used to take 8 minutes to enter one invoice, describe it and send it out for approval. After automating download, account coding suggestions and approval, the accountant spends 3 minutes on a KSeF invoice and 5 minutes on a document from outside KSeF.

The calculation: before, 600 × 8 min = 4,800 min, or 80 hours a month. Now, 540 × 3 min + 60 × 5 min = 1,920 min, or 32 hours. The difference is 48 hours a month, roughly 0.3 of a full-time post.

Plug in your own figures: the number of invoices, the share of documents outside KSeF and the measured time to handle one invoice. On top of that come benefits that are harder to quantify, such as fewer overdue payments and a faster month-end close.

Start by describing your current workflow, not by choosing a tool. Answers to four questions are enough: where invoices come from, who describes them, who approves them and when they are paid. Then go through the four steps in the list below.

The most common mistake is stopping at the KSeF connection while invoices are still printed out for signature. The second is leaving all decisions about the workflow to the external accounting firm, even though approval and payments happen inside the company. The third is automatic account coding with no link to purchase orders, so the accountant still checks every invoice by hand.

It is worth planning the rollout before the end of 2026. That is when the relief for the smallest suppliers and for cash registers ends, so the share of KSeF invoices in your company will grow.