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Advance payment invoice: deadline and contents
An advance payment invoice documents money that arrived before delivery. Here is the deadline, the required contents, the final-invoice rule and the KSeF marker...
Dropshipping: how it works and what you answer for
Dropshipping is a model where the supplier ships straight to the buyer. See how it works, whether it is lawful, and which duties stay with you.
The KSeF certificate: type 1 and type 2, how to get one and when you need it
Type 1 signs you in, type 2 marks offline invoices — one certificate will not do both. How to obtain one, whose data it carries, and when it is genuinely requir...
The offline24 mode in KSeF: what the “24” means and how to issue an invoice
Under offline24 you issue the invoice electronically and transmit it later. What the “24” means, why the P_1 date governs, and how many QR codes an offline invo...
A KSeF failure: identifying the mode and counting the deadline
The Ministry announces a KSeF failure — an error in your own software is not one. How to identify the mode, count the deadline and build the retry queue.
The KSeF number: what it is, what it contains and where to find it
KSeF assigns the number once it accepts the invoice, and the UPO returns it. Where to find it, how it differs from your own invoice number, and what to do when...
Order management software: flat fee or per-order commission
Order management software bills either a flat fee or a per-order commission. One piece of arithmetic separates them — work out your cost before growth multiplie...
Allegro, Empik and Erli in one panel
A second and third channel cost whatever running them costs. What has to be in order before you add another marketplace — and what stops growing once it is.
Subiekt GT and Nexo PRO in multichannel selling
Subiekt knows your warehouse and your documents but not your marketplaces. What should happen between them, and where the boundary of responsibility runs.
Corrections and returns in KSeF: why one connection is not enough
"No invoice to send" on a correction looks like a bug and is a missing setting. How a return becomes a correction, and what has to be configured for it to arriv...
Invoices for private individuals in KSeF, and buyers with no NIP
A private individual with no number, a Czech buyer with an IČO, a customer at a different VAT rate. Three everyday marketplace situations that end in a KSeF rej...
Allegro invoices in Fakturownia and wFirma — and what happens next with KSeF
How an invoice is generated automatically from an Allegro order in your accounting software, and what has to be true for it to continue to KSeF.