Yes, your POS system needs a stable, permanent internet connection. With GKS 2.0, the fiscal data module (FDM) continuously transmits transaction data to the Belgian Tax Administration's cloud. An unstable network is therefore no longer just an operational inconvenience, but also a fiscal risk with potential fines of up to €5,000 per infringement. Unipage supplies GKS 2.0-certified POS systems and helps hospitality businesses configure their network correctly.
With GKS 2.0, a stable internet connection for your POS system is no longer optional but a legal requirement. The fiscal data module (FDM) continuously transmits transaction data to the Belgian Tax Administration's cloud: if the connection drops, fiscal registration stops and you risk fines of up to €5,000 per infringement. Unipage supplies GKS 2.0-certified POS systems and helps hospitality businesses set up their network correctly.
Since 1 July 2026, new hospitality businesses must immediately use GKS 2.0. Existing businesses receive a phased transition, with deadlines on 1 July 2027, 1 July 2028 or 1 January 2029, depending on when your current POS system was purchased (geregistreerdkassasysteem.be).
The difference from GKS 1.0 lies in how the fiscal data module (FDM) works. Where the FDM previously only stored a summary of your transactions locally, it now continuously transmits the full transaction data to the Belgian Tax Administration's cloud. This means your POS system must be permanently online to remain fiscally compliant, not occasionally, but throughout the entire business day.
A network that goes down on a busy Saturday evening is therefore no longer just inconvenient for your guests: it directly affects your fiscal obligations. Non-compliance risks fines of up to €5,000 per infringement.
During a brief network interruption, a POS system typically continues to function for a while, but the continuous transmission to the FDM cloud stops as long as the connection is down. How your system handles this varies by provider and the duration of the outage.
Industry estimates show that 82% of merchants experienced at least one significant outage of more than 30 minutes in the past year (estimate via Gartner 2025 Retail Technology Study, cited by orderpin.co). This is not uncommon, but it is avoidable: a stable primary connection with a 4G backup keeps the risk of interruptions low, even during your busiest moments.
For a fixed POS system and fixed payment terminal, a wired connection is usually the most stable choice, followed by strong Wi-Fi if cabling is not practical. Metal kitchens, thick walls and a separate terrace create dead zones, precisely in the places where you cannot afford to lose the connection.
Portable or mobile payment terminals, for example for table service or terrace use, need good Wi-Fi coverage in those corners, or a stable 4G connection as a backup or primary solution.
If you're running multiple devices simultaneously, such as POS, terminals and kitchen screens, Wi-Fi 6 (802.11ax) is a smart choice: it supports up to eight simultaneous MIMO streams and performs significantly better with many concurrent connections than older Wi-Fi standards (devolo.be).
Many businesses run their POS system and guest Wi-Fi on the same network, often without thinking about it. On a busy Saturday, when dozens of guests simultaneously connect their phones to stream or post, that directly consumes bandwidth from your POS system and payment terminals.
A separate network, one for your POS system and payment terminals and another for your guests, structurally prevents this problem. Furthermore, PCI DSS, the international payment security standard, requires that payment data not be on the same network as arbitrary guest devices (Worldline on PCI DSS). VLAN segmentation is the standard technical solution: POS and payment data remain protected and your checkout has uninterrupted bandwidth.
Have a professional place access points in the right locations, including the terrace and enclosed spaces.
Choose Wi-Fi 6 if you connect multiple devices simultaneously.
Set up a 4G backup for your critical devices, independent of your fixed line.
Keep your POS system and guest Wi-Fi on separate networks, preferably via VLAN.
Test your connection during your busiest moment, not on a quiet Tuesday morning.
With GKS 2.0, the fiscal data module (FDM) of your POS system continuously transmits transaction data to the Belgian Tax Administration's cloud. If the internet connection drops, that transmission stops, and with it your fiscal registration. Businesses that do not comply risk fines of up to €5,000 per infringement (geregistreerdkassasysteem.be). Industry estimates also suggest that a hospitality business can lose 15 to 25% of potential revenue during an unexpected POS outage (estimate via vivantcorp.com).
Not structurally. GKS 2.0 is built around a fiscal data module (FDM) that continuously transmits transaction data to the Belgian Tax Administration's cloud. Without an internet connection, that transmission cannot take place. Industry estimates show that 82% of merchants experienced at least one significant outage of more than 30 minutes in the past year (estimate via Gartner 2025 Retail Technology Study, cited by orderpin.co). A 4G backup alongside your fixed line is the most reliable way to reduce that risk.
A fixed payment terminal at the counter in a chip shop or snack bar works best with a wired connection or strong, stable Wi-Fi. Chip shops and snack bars often have metal kitchens and thick walls, creating dead zones precisely where you most need the connection. Offline payment transactions that are not settled in time can face a delay of 24 to 72 hours, with a risk of automatic rejection (Adyen Docs).
It depends on your venue layout. Wi-Fi is generally more stable and cheaper to run, as long as coverage is good everywhere. 4G offers more flexibility and works independently of your fixed network. Many businesses combine both: Wi-Fi as the primary connection and 4G as a backup. Wi-Fi 6 (802.11ax) is the smartest choice for venues with multiple simultaneous devices: it supports eight concurrent MIMO streams and is designed for high-density connection environments (devolo.be).
This is not recommended, for two reasons. First, busy guest traffic consumes bandwidth from your POS and payment terminals precisely when you need them most. Second, PCI DSS requires that payment data not be on the same network as arbitrary guest devices. VLAN segmentation solves both problems structurally.
During a brief interruption, a POS system typically continues to work for a while, but the fiscal transmission to the FDM cloud stops as long as the connection is down. Payment terminals settle offline transactions once the connection is restored, but transactions above a certain authorisation floor are automatically declined: offline settlement can take 24 to 72 hours (Adyen Docs). A 4G backup is the most reliable way to prevent this.
Yes. GKS 2.0 is mandatory for all hospitality businesses generating more than €25,000 in revenue from meals consumed on the premises. New businesses must use it immediately from 1 July 2026. Existing businesses receive a phased transition period, with deadlines on 1 July 2027, 1 July 2028 or 1 January 2029 (Belgian Tax Administration via geregistreerdkassasysteem.be).
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