- Short answer
- If only the TSE fails, German tax guidance won't object to further sales, but receipts must flag the failure; log it and fix it without undue delay.
- Shopify POS
- No Shopify help page we read on September 30, 2026 says what POS prints while the TSE is down.
- Fiskaly's guidance
- For its integrators: never block the register, and never sign a transaction after the fact.
- Replaced TSE
- The BMF FAQ sets no duty to report the swap; updating the TSE details in ELSTER is optional.
Can you keep selling when the TSE fails or is unreachable?
The symptom is a TSE that stops signing sales: the device broke, or the cloud TSE can't be reached. Where the failure concerns only the TSE, No. 1.14.3 of the AEAO on §146a says the tax office won't object (nicht beanstandet) if you keep using the register until the cause is removed.
Germany's finance ministry (BMF) puts a failed TSE and an unreachable one, such as a cloud solution, in one FAQ question and answers that in a Störung, a disruption, you may switch to a second TSE. The AEAO on §146a doesn't mention an unreachable TSE; we read an unreachable cloud TSE as a failure of the TSE alone.
Which failure you have decides the receipt rule
| What failed | Receipts | Recording |
|---|---|---|
| The TSE only (on our reading, also a cloud TSE you can't reach) | Still required; the failure must show, and date and time come from the register | Keep using the register until the cause is fixed |
| The whole recording system | The receipt duty lapses | Paper records are permissible while it is down |
| The printer or e-receipt transmission unit | The receipt duty lapses | The register must still be used |
AEAO on §146a, Nos. 1.14 and 2.7; AEAO on §146, No. 2.1.6; read September 30, 2026.
What must the receipt and your records show?
- The failure, on the receipt. If the register can run without a working TSE, the failure must be visible on any receipt, through the missing transaction number or another unambiguous mark.
- Date and time, from the register. You still owe a receipt when the TSE can't supply every value; date and time then come from the recording system.
- The downtime and its cause, in your records. Log when the TSE was down and why; the recording system may do this automatically.
No. 1.14.4 of the AEAO sets the pace: remove the cause without undue delay (unverzüglich) and make sure the §146a requirements are met again as fast as possible (schnellstmöglich).
What do Shopify and Fiskaly say about a TSE outage?
Shopify's help page for the TSE (KassenSichV) app says its cloud TSE is provided by Fiskaly, a third-party compliance service provider. When a retail location has TSE support activated, the TSE information is printed on customer receipts.
None of the Shopify help pages we read on September 30, 2026 — the TSE app page, the POS country requirements and the offline-selling pages — describes what POS prints, or whether it blocks, while the TSE or Fiskaly can't be reached, or whether the app can switch to a second TSE. Ask Shopify Support what your receipts will show.
Fiskaly has a support article, last updated October 2, 2023, for developers integrating its SIGN DE cloud TSE. It says the register must not be blocked over connection problems; instead of the signature, the receipt should carry an error message giving the reason, such as „TSE ausgefallen“ (TSE failed); and signing the transaction later is not permitted. That is Fiskaly's standard for its integrators, not a description of Shopify's app.
The country requirements page names offline limits for France and Spain; for Germany it only says retailers must comply with KassenSichV. Compare the offline limits Shopify names per country.
Offline mode is a general POS feature: cash and manual payments without an internet connection, no returns, exchanges or voids, and Bluetooth receipt printers that print while connected to the POS device. Those pages don't mention the TSE. See what Shopify POS offline mode can and can't do.
Does a replaced TSE need a new ELSTER notice?
You don't have to report a TSE swap: the BMF FAQ, as of April 29, 2026, says there is no duty to report a change of TSE. Keep the purchase and replacement documents as part of your Verfahrensdokumentation (process documentation).
Updating is voluntary: for a smoother cash-register inspection or tax audit, you may send the changed TSE details — serial number, BSI certification ID, date put into service and TSE type — through Mein ELSTER or the ERIC interface. One notice can't carry both the old and the new TSE details for the same recording system. See how to enter the TSE serial in the ELSTER notice.
No. 1.6 of the AEAO ties each recording system, or group of systems, to exactly one TSE bei störungsfreier Verwendung, during trouble-free use. Whether Shopify's app can switch to a second TSE in a disruption, as the BMF FAQ allows, is the gap above.
The mandatory notice runs from the register, not the TSE: §146a(4) AO gives one month after you acquire a recording system or take it out of service, and the AEAO counts a destroyed or lost system as taken out of service. Who files it: where the notification goes and by when.
This article was written entirely by AI under human editorial direction. The editor sets the topic and structure, runs multi-stage validation on facts, links, and interactive elements, and verifies the output is useful from a business perspective. All claims are checked against official Shopify sources. Details may change — always confirm critical data at shopify.com.
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