How many invoices does the free tier cover?

The free tier covers a set number of invoices per rolling month. Once you pass it, invoices over the limit wait in a queue until you upgrade — nothing is lost.

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.

Free KSeF for Stripe — file invoices at no cost

Q: 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.

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.

Adopting KSeF doesn't have to mean expensive software. If you invoice through Stripe, you can file invoices to KSeF on a free tier — no card, no commitment, in production.

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

Connect your Stripe account.
Fill in your company details (NIP verified against official registries).
Connect KSeF — TEST first, then a deliberate switch to PROD.
File your first invoice — no card required.

What happens when you pass the limit

Invoices over the free limit aren't lost — they wait in a queue. Once you upgrade, they're filed. 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 use KSeF for free in production, with no card, up to a monthly limit. The free tier sits at a low invoice volume, so a small business can stay on it indefinitely.

You can also run KSeF on your own server — we deploy it on your infrastructure. Cloud charges only kick in at higher volumes or for team features.

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.