POS system with TSE: what the KassenSichV requires

What is a TSE?

The technical security system (TSE) signs every transaction in the till so that it cannot be changed unnoticed later. It has been mandatory since 2020 (§ 146a AO, Kassensicherungsverordnung) and must be certified by the Federal Office for Information Security (BSI).

TWT Kasse uses a certified cloud TSE from fiskaly: no USB stick and no memory card, the signature comes over the internet connection.

The duty to issue receipts

A receipt must be issued for every sale, on paper or electronically (§ 146a (2) AO). Among other things it carries the transaction number, the time and the signature of the TSE.

TWT Kasse issues the receipt digitally by QR code or prints it from the browser, with every item, the VAT per rate, the payment and the signature of the TSE.

Registering the till with the tax office

Since 2025 electronic tills must be reported to the tax office over ELSTER (§ 146a (4) AO). Tills acquired before 1 July 2025 had to be reported by 31 July 2025; new tills and decommissioned ones within one month.

TWT Kasse builds this notification from the data of your tills and premises, has it checked by ELSTER, and you submit it straight from TWT Kasse.

Cash audits and DSFinV-K

The tax office may inspect the till without notice. For that the till data must be exportable in the uniform DSFinV-K format; TWT Kasse creates this export at the press of a button.

What else TWT Kasse does

• Sell, take payment, issue receipts, close the day and keep the cash book.
• On smartphone, tablet and in the browser.
• Cash, card payment through your own terminal, and partial payment.
• Users and permissions for your team.
• A price per till and personal help with the setup.