What it is
These rules concern buyers and suppliers in chains for food, agricultural products, and goods important for market supply. A simple example: a retail chain takes goods from a producer, then pays late, cancels an order at the last moment, or charges for a service the supplier did not really receive. Those are the kinds of situations Serbia's Competition Commission, or KZK, will assess.
What is already decided
KZK's Council adopted the rules on June 29, 2026, and after publication in Serbia's Official Gazette they take effect on July 4. This is not a new tax or support measure. It is an explanation for the market: where an ordinary commercial dispute ends and where a powerful buyer is using its position against a supplier.
What buyers cannot do
The clearest bans concern money, orders, and contracts. A buyer should not pay late, cancel perishable goods too close to delivery, change a contract alone, refuse written confirmation, or push its own costs onto the supplier. For a supplier, that is the difference between a predictable sale and a situation where goods have already been produced but the risk suddenly falls back on them.
Payments and order cancellation
For perishable agricultural and food products, the key deadline is 30 days after the delivery period or invoice. For other products, the maximum is 60 days. If a perishable-goods order is cancelled less than 30 days before delivery, KZK will look beyond the contract and ask a practical question: could the supplier realistically sell those goods to someone else, or were they left with a loss?
When trader services are allowed
Some trader services are allowed if they are real and agreed in advance. That can include storage, marketing, product listing, extra display, sales data, or a promotion. But the chain has to show that the supplier genuinely requested or accepted the service, and that the price looks like real costs rather than a hidden fee for shelf access.
Commercial retaliation
A separate issue is commercial retaliation. This is when a buyer punishes a supplier for using legal rights or refusing unfair terms. In the Danas/eKapija examples, it can mean removing products from sale, cutting orders, delaying receipt of goods, or withholding marketing support. For a smaller producer, even one such decision can mean surplus stock, disrupted production, and lost money.
Why it matters
For producers and suppliers, this is protection against a strong buyer that can dictate deadlines, change prices or quantities, and push commercial risks back through the chain. For traders, it is a signal to document contracts, invoices, written confirmations, promotional services, and order changes in advance. For grocery shoppers, the issue matters indirectly: when suppliers are paid on time and know volumes ahead of time, they can plan food production and deliveries more reliably.
How this will show up in practice
After July 4, 2026, the important signals will be KZK's first cases. They will show which situations the commission treats as ordinary business disputes, which ones it sees as pressure on suppliers, and what consequences concrete violators face.