Quick take: key points
If you are a flat-rate farmer (RR),
KSeF does not impose a mandatory VAT RR flow on you.
From April 1, 2026, there is an
optional path to issue and store VAT RR invoices in KSeF
(issued by the buyer). The key point:
the farmer decides whether to grant consent and authorize a
specific buyer.
Who this article is for and one core rule
This guide is for farmers in Poland who sell agricultural products as flat-rate farmers (RR) and settle transactions with VAT RR invoices, typically issued by the buyer (an active VAT taxpayer).
One core rule: VAT RR invoices in KSeF are optional for RR farmers and depend on farmer consent and explicit buyer authorization.
KSeF in 2026: what changes for RR farmers
What KSeF is (simple version)
KSeF (National e-Invoicing System) is a government system for issuing, receiving, and storing structured invoices online. Its goal is to standardize document flow and reduce manual data entry errors.
The key change from April 1, 2026
From April 1, 2026, buyers can issue VAT RR and VAT RR CORRECTION in KSeF, but only with RR farmer consent and only after authorizing a specific buyer. Without consent, the process can continue outside KSeF as before.
Think of this as a simple on/off switch per buyer relationship: you can enable KSeF for one buyer and keep the traditional process for others.
VAT RR in KSeF: practical workflow
In the standard VAT RR model, the buyer (e.g. purchasing company, processor, trading company) issues the invoice for the RR farmer. The RR farmer does not issue a standard VAT invoice in this flow.
What must happen for VAT RR in KSeF: the RR farmer must:
- submit a declaration of RR status in KSeF,
- authorize a specific buyer to issue VAT RR invoices and corrections.
Key conclusion: without declaration and authorization, the buyer cannot issue VAT RR in KSeF.
Step by step: how an RR farmer enables VAT RR in KSeF
-
Decide if you want VAT RR in KSeF
If you sell to recurring buyers, KSeF often improves order in documents and reduces manual archiving. -
Agree invoice flow with the buyer
Example: buyer issues VAT RR in KSeF and you receive a confirmation (email/SMS) with document details. -
Submit RR declaration and authorize buyer in KSeF
Without this step, KSeF issuance is not possible. -
Review first issued documents
Validate core fields (farmer, buyer, product, quantity, price) and fix process issues immediately. -
Set correction rules before errors happen
Corrections are common in agriculture due to quantity/quality differences, supplements, deductions, or returns.
VAT RR corrections: what matters most
Corrections are a normal part of agricultural trade. They often result from differences in weight/classification, quality adjustments, deductions, or post-delivery settlements.
Consistency rule: if the original VAT RR invoice is in KSeF, the correction should also be issued in KSeF.
Practical conclusion: when enabling VAT RR in KSeF with a buyer, treat it as one complete process - invoices + corrections.
Common scenarios: what to do
| Situation | Does KSeF apply to RR farmer? | What it means in practice |
|---|---|---|
| RR farmer selling to VAT company (buyer/processor) | Optional (from 01.04.2026) | Farmer decides: consent + buyer authorization in KSeF. |
| One main buyer and regular seasonal sales | Usually worth considering | Easy to start in one relationship and standardize documents fast. |
| Many small buyers | Depends on organization | Start with 1-2 major buyers, keep small flows traditional. |
| Quantity/price error and correction needed | Yes, if original invoice was in KSeF | Issue correction in KSeF and align process with buyer early. |
What FarmPortal's KSeF module gives you
In FarmPortal -a free FMS , we are building KSeF support so RR farmers can manage everything in one place: fields, operations, stock/batches, counterparties, and sales documents.
Practical benefits
- Single document archive: VAT RR and corrections linked to buyer and season.
- Less searching: quick filtering by product, buyer, year, correction status.
- Completeness control: identify missing documents before settlement.
- Data consistency: fewer errors between farm records and invoice records.
- Audit readiness: sales and document history in one panel.
FAQ - RR farmer questions
Does an RR farmer have to use KSeF?
No. It is optional and depends on farmer consent and buyer authorization.
What is required for buyer-issued VAT RR in KSeF?
RR status declaration in KSeF and authorization of a specific buyer for VAT RR and corrections.
Can I approve invoices but not corrections?
In practice, treat invoices and corrections as one process because corrections are a normal part of agricultural settlement.
What if the original VAT RR was in KSeF?
Apply consistency: correction should also be handled in KSeF.
Glossary
- Flat-rate farmer (RR) - farmer using a special VAT settlement regime.
- VAT RR invoice - invoice issued by the buyer for products bought from RR farmer.
- VAT RR correction - correction document for VAT RR invoice.
- KSeF - National e-Invoicing System for structured invoices.
- Authorization in KSeF - permission defining who can act in specific document flows.
Summary and key takeaways
- RR farmers are not required to use VAT RR in KSeF from April 1, 2026.
- Buyer-issued VAT RR in KSeF requires farmer declaration and buyer authorization.
- When enabled, handle both invoices and corrections in one consistent process.
- Greatest time savings come from connecting invoices with farm records in one system.
About the author and publisher
Author: Adam Nycz - Agri Solutions (product and digital
integration for agriculture).
Publisher: FarmPortal (AgriSolutions) - farm management
platform covering field records, operations, weather data, production
documentation, and digital integrations.
This material is for informational purposes only and does not constitute legal or tax advice.
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