Start with the purpose, not the amount
A younger child can practise with a small weekly amount. An older child may receive more each month when it also covers clothing, transport or leisure. Make clear what parents still pay for.
Fixed amount, chores or both?
A fixed amount teaches planning. Extra chores can provide a way to earn more, while ordinary family responsibilities do not always need payment.
Allow safe consequences
If the money is spent early, avoid automatically topping it up. Talk about the choice and the next opportunity. Small mistakes now can become valuable learning.