✅ Checklist: Reporting Cash Registers to the Tax Office (from 2025)

1. 📦 Identify Your Cash Register System

• [ ] Manufacturer and model name

• [ ] Serial number of the cash register

• [ ] Type of system (e.g., PC-based register, mobile device, scale with cash register function)

2. 🔐 Technical Security Device (TSE)

• [ ] Type of TSE (integrated, external, cloud-based)

• [ ] Serial number or unique identifier of the TSE

• [ ] TSE provider or manufacturer

3. 🗓️ Date Information

• [ ] Date of initial operation

• [ ] Date of deactivation (if applicable)

4. 📍 Assign to Business Location

• [ ] Address of the business location where the register is used

• [ ] Business ID number (if available)

5. 🧾 Submit via “Mein ELSTER”

• [ ] Access to “Mein ELSTER” portal is set up

• [ ] Cash register reported using the “Register Cash System” form

• [ ] Confirmation of successful submission saved

🏠 Welcome to KDLS24 – Your Pilot for Clarity and Security

Experience. Structure. Serenity. KDLS24 supports small and medium-sized enterprises with commercial expertise and digital foresight – step by step.

I’m Udo Sonntag, founder and architect of KDLS24. After decades of projects and responsibility, I now choose a calmer pace – not out of retreat, but out of maturity. KDLS stands for “Kaufmännische Dienstleistungen Sonntag” – and today also for: clear thinking, lasting solutions.

🔍 How KDLS24 Thinks and Works

Step by step – it’s more than a motto. KDLS24 stands for a calm, clear, and effective approach to complex topics. It’s not speed that matters, but orientation, experience, and reliability.

Here are four contributions that illustrate this approach:

🧾 1. Clarity in Everyday Office Life

How structured workflows and office management free up your mind – for what truly matters.

🔐 2. Data Security for SMEs – Piloting Instead of Tech Show

Why small businesses are especially vulnerable – and how KDLS24 provides guidance.

🧠 3. Sharing Experience – Vocational Training with Perspective

From exam preparation to software development: knowledge that makes a difference.

🧭 4. Step by Step – Why Speed Isn’t Everything

A personal reflection on KDLS24’s transformation and the power of slowing down.

📘 Commercial Bookkeeping Assistance – Structured and Legally Compliant

KDLS24 offers commercial bookkeeping assistance in accordance with § 6 Nos. 3 and 4 of the German Tax Consultancy Act (StBerG) – practical, discreet, and compliant with legal standards. Services are provided exclusively to existing clients and strictly within the permitted scope of activity.