Almost everyone has asked this at least once. The frustrating part is that your spending can feel "normal" day to day and still look very different when totaled at month-end.
Step one: collect all transactions in one place
Pull 30 days of card, bank, wallet, and cash spending if possible. Include transfers and automatic renewals. The goal is to remove blind spots. If any account is missing, your conclusions will be incomplete.
Step two: categorize without overthinking
Use broad categories first: housing, food, transport, debt, subscriptions, shopping, and savings. Perfect categorization is less important than consistency. You can add detail in month two once patterns are visible.
Step three: investigate the top three categories
Most change comes from your largest variable categories, not tiny isolated cuts. For many people that is food away from home, transport, and online shopping. Identify one specific behavior change for each.
Example: from confusion to a simple plan
Lena thought shopping was her biggest issue. The data showed otherwise: delivery fees and late-night food spending were the real leak. She set a weekly delivery cap and planned two easy meals in advance. Tracking in Budget Nerd made the pattern visible fast and reduced decision fatigue.
Takeaway
You answer "where did my money go" by tracking every transaction once, then focusing on the categories that matter most.