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KSeF Kit
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Free KSeF for Stripe — file invoices at no cost

Yes — KSeF Kit has a free production tier for Stripe users: you file invoices to KSeF at no cost, with no card on file, up to a monthly limit. This is real filing in production, not a trial; invoices over the limit wait in a queue. It's genuinely free KSeF software.

What "free production tier" means

This isn't a trial that runs out in a few days. It's real invoice filing to KSeF up to a monthly limit on a rolling month. A small business or sole trader with few invoices can stay on the free tier indefinitely.

How to start

  1. Connect your Stripe account.
  2. Fill in your company details (NIP verified against official registries).
  3. Connect KSeF — TEST first, then a deliberate switch to PROD.
  4. File your first invoice.

What happens when you pass the limit

Invoices over the free limit aren't lost. They wait in a queue and we file them on our own as room frees up in the limit. The limit covers a rolling month, so room comes back a little at a time and that can take several weeks. If you upgrade, we file them right away. Payment (when you actually need it) runs through Stripe Billing.

Is there free KSeF software?

Yes. KSeF Kit is free KSeF software for Stripe users: you file invoices in production, with no card, up to 6 invoices per rolling month. A small business with a low invoice volume can stay on the free tier indefinitely.

You can also run KSeF Kit on your own server: we deploy it on your infrastructure for a one-time fee.

Free, but complete

The free tier covers the full process: building FA(3), NBP currency conversion, the QR code, UPO, and corrections. See the full Stripe + KSeF integration.

Frequently asked questions

Can you file invoices to KSeF for free?

Yes. KSeF Kit has a free production tier — you can file invoices to KSeF at no cost, with no card on file, up to a monthly limit. This is real filing in production, not just a trial.

How many invoices does the free tier cover?

The free tier covers 6 accepted invoices per rolling month. Once you pass it, invoices over the limit wait in a queue. We file them as the limit frees up, or right away if you upgrade.

Is the free tier just the test environment?

No. The free tier runs against KSeF production — you file real invoices. The TEST environment is also available separately for risk-free practice.

Is there free KSeF software?

Yes. KSeF Kit is free KSeF software for Stripe users: you file invoices in production, with no card, up to a monthly limit. At a low invoice volume a small business can stay on the free tier indefinitely.