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All FAQs regarding registering cash registers with the tax office – using our Meldefluss app

Q1: What do I need to upload or register my cash register data with the tax office myself?

To register a cash register with the tax office, you upload an Elster import file (you can do this here)
→ Click on Login at the top and log in.
→ Or create a user account if you don't have one yet.
More information here.

Q2: How can I register my cash register automatically or manually with the Meldefluss app?

The cash register must usually be registered within 30 daysof commissioning, but we recommend doing so immediately after commissioning.
To do this quickly, select the ‘Reports’ tab in the Meldefluss app and follow the steps to register the cash register – see also the video in the main area of the app, which shows all the steps for creating an Elster account and uploading the import file.
‘1-click reporting’ – If you do not have an Elster account, you can use the convenient ‘1-click reporting’ option in Meldefluss (see Meldefluss → Plans) to register the cash register, even without an Elster account. More information here.

Q3: Where can I find my TSE serial number and other information my tax advisor needs?

You can find this in the OpenFiskal app → Cash registers → click on the cash register to copy the TSE SN, BSI certification ID, commissioning date of the TSE, and eAS SN.

Q4: Why is my cash register not automatically displayed in the OpenFiskal app or Meldefluss app?

If no purchase or test purchase has been made on the POS device (e.g. iPad or Android tablet), then no cash register will usually be recognised and displayed in the OpenFiskal ‘Cash registers’ section or in the Meldefluss app. Make at least one sale or test sale and the cash register should then appear in the list.

Important: If a cash register was in operation in the past but is now deactivated, click on the ‘Search cash registers’ button at the top right and the deactivated cash register should appear there. The function searches past POS orders from the last 14 days for the cash register IDs and then lists those that are not yet on the list.

Q4: The cash register is visible in OpenFiskal and fiscalised. What is the next necessary step?

Once the cash register is fiscalised (green), report it to the tax office (mandatory). Generally, there is a 30-day deadline to report the cash register, but we recommend doing so immediately after the first ‘reportable event’ such as fiscalisation or commissioning to avoid any problems with the tax office.
We recommend using our separate reporting flow app for this. With the manual basic report, the reporting flow app creates an XML import for ELSTER that you or your tax advisor can upload manually to Elster. See the video directly in the app, which explains the steps. Alternatively, the app also offers an automatic and fee-based direct report to Elster, which greatly simplifies the process for you. More information here.

Q5: I have new hardware (e.g. an iPad instead of an Android tablet). Do I have to deregister the old cash register?

Yes. If you are replacing an old device and the new hardware is assigned a new cash register ID, you should properly deregister the old cash register.
De-fiscalisation and deregistration: First, the old cash register should be de-fiscalised in the OpenFiskal app and then deregistered with Elster if it was registered there.
Backup of old data: Ensure that all audit exports from the old cash register (e.g. DSFinV-K) have been downloaded and archived.
Deregistration via Meldefluss: The old devices can be easily deregistered via the Meldefluss app by specifying the decommissioning date.

Updated on: 02/12/2025

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