Invoicing in Poland, KSeF and the UPO, the ryczałt and the JPK files — written out step by step.
Invoicing in a foreign language is completely legal for B2B transactions in Poland, provided the VAT amount is shown in PLN. From 1 April 2026 most sole proprietorships must issue structured invoices via KSeF using the FA(3) schema.
A B2B developer in Poland must manage KSeF invoicing, ZUS and ryczałt tax by the 20th, and JPK_V7M by the 25th of each month. For monthly invoices exceeding PLN 10,000 gross, KSeF has been mandatory since 1 April 2026. Learn how to calculate your 12% flat-rate tax and health contributions.
Sending an invoice to KSeF is only the first step of your monthly routine. The invoice must be correctly recorded in your VAT registers with its KSeF number, and then reported in JPK_V7M, ryczałt tax and ZUS. Follow this practical guide for a sole trader to see how the systems interact.
A B2B developer in Poland needs more than just simple invoicing software. The right tool must handle structured KSeF invoices, convert foreign currencies at NBP rates, and file JPK_V7 directly to receive an UPO. Compare your options before the new tax penalties under Article 106ni take effect on 1 January 2027.
Following the data breach detected on September 28, 2026, store owners must rotate all external Fakturownia API tokens. Temporary IP restrictions are not enough to secure your integrations. Learn how to replace your keys in WooCommerce and Shoper without causing any store downtime.
Choosing the right tax structure in Poland for 2027 requires comparing ryczałt, linear tax, and the tax scale before the 22 February 2027 deadline (20 February is a Saturday). For a B2B contractor earning over PLN 15,000 monthly with low expenses, the 12% lump-sum tax yields the highest net income. However, high operational costs or qualifying for the 5% IP Box relief can make the 19% linear tax a more profitable alternative.
Under the draft state budget, standard social security contributions for a Polish sole trader will exceed 2,000 PLN per month in 2027 for the first time, excluding the health contribution. Your choice of bookkeeping setup determines how many hours you spend on admin and the level of tax risk you carry. We compare six different administrative options for your business.
The transition exemptions in the Polish VAT Act expire on 31 December 2026, ending the PLN 10,000 monthly limit and simplified invoices from cash registers. From 1 January 2027, VAT-registered taxpayers must include the KSeF number in bank transfer references. The proposed deferral of penalties does not suspend these obligations.
The monthly minimum wage in Poland will rise to PLN 4,950 gross on 1 January 2027. This change directly increases the preferential ZUS base and the minimum health contribution for sole proprietorships. Learn how to update your standing transfers and avoid payment arrears.
A KSeF response consists of three layers: the HTTP status, the exceptionCode, and the invoice status. Understanding these layers helps determine whether a message requires technical XML validation fixes or accounting action.
Comparing an accounting office retainer with self-accounting software requires looking at hidden fees, annual tax returns, and the value of your time. Calculate your break-even hourly rate to choose the most cost-effective option.
The right e-invoicing tool must align with your operational processes. For inventory, payroll, or full statutory accounting, traditional ERP systems or comprehensive platforms are recommended. Biurko is designed specifically for direct KSeF integration, multi-entity management, and automated workflows.
The mandatory split payment mechanism applies to B2B invoices exceeding PLN 15,000 gross that contain at least one item from Annex 15 of the VAT Act. Failure to comply triggers a 30% VAT penalty, income tax cost disallowance, and personal fiscal-penal liability. Learn how to handle MPP transfers and KSeF requirements.
Switching your invoicing tool mid-year does not require starting your numbering sequence from one. Polish regulations only demand chronological sequence and uniqueness. Sales history issued through KSeF can be pulled automatically into your new software at no extra cost.
Self-billing in KSeF requires a valid contract, an agreed approval procedure, and a technical permission granted in the system. Without the system permission, KSeF will reject the invoice. Discover how to structure the workflow to protect your right to deduct input VAT.
An email when we publish a new article — and nothing else.
We use only essential cookies. Visit statistics are kept on our server, with nothing saved on your device. Website Policy
