A large purchase is obvious, while dozens of small charges disappear into transaction history. The easiest way to spot them is by category and repetition.
Delivery and service fees
Several small fees each week can become a meaningful monthly total. Compare delivery with pickup or combined orders.
Unused subscriptions
A subscription looks small until you multiply it by twelve months. Review recurring charges every few months.
Filler purchases
People often add items only to reach free shipping or a promotion. Paying the delivery fee can sometimes cost less than buying something unnecessary.
On-the-go drinks and snacks
The point is not to ban coffee. If a purchase happens daily, it deserves its own budget line.
Small banking fees
Transfer, maintenance, ATM and conversion fees may look insignificant individually. Review the rates attached to your routine transactions.
Bottom line
Keep the solution simple: start with the most likely cause, change one factor at a time, and observe the result. That makes it much easier to identify what actually works in your situation.