Transactions tell you how much; categories tell you why
A list of amounts and dates tells you how much money moved. Categories explain what that money was for — groceries, rent, salary, a medical bill, a holiday. In YAFFA, every transaction item gets a category, and those categories become the foundation of every report, trend, and budget comparison the app produces.
Unlike rigid, preset taxonomies found in some finance apps, YAFFA's categories are entirely yours to define. You name them, you organize them, and you can reshape them as your financial life evolves — without losing any history in the process.
What categories help you do
Build a structure that matches how you think.Create categories that reflect your real life — whether that's broad buckets like “Food” and “Housing”, or more granular ones like “Work lunches” and “Mortgage”. The structure is yours to decide.
Organize with a simple parent–child hierarchy. Place related categories under a broader parent to keep your list readable without forcing a complex multi-level taxonomy. YAFFA keeps the hierarchy intentionally shallow so it stays practical for everyday use.
Speed up transaction entry with smart suggestions. As you record more transactions, YAFFA learns your habits and surfaces relevant category suggestions during entry. Combined with payee default categories, repeated manual selection becomes rare.
Keep records consistent over time. Consistent categorization is what makes spending trends and year-on-year comparisons meaningful. When the same type of purchase always maps to the same category, your reports reflect reality instead of noise.
Retire old categories without losing history. When a category no longer fits your life, mark it as inactive rather than deleting it. It disappears from your day-to-day entry interface, but every past transaction that used it stays exactly as recorded — still visible in history, still included in reports.
Reorganize safely with merge. Changed your mind about how to group things? Use the merge feature to fold one category into another. All historical transactions are reassigned in a single operation — no manual editing across hundreds of past records.
Unlock meaningful reports. Every chart and summary in the reports section groups your financial activity by category. The more deliberately you categorize, the more useful those insights become.
Categories and payees work as a pair
Categories define what your money is spent on; payees define where it goes. YAFFA connects the two: each payee can have a default category, so selecting a familiar payee during transaction entry automatically fills in the category as well. The result is that a well-maintained payee list and a well-maintained category list together make recording transactions feel almost effortless.
A structure that evolves with you
Most people refine how they think about their finances over time. YAFFA's categories are designed for that. You can rename, reorganize, merge, and deactivate as your priorities change — and because historical records are always preserved, you never have to choose between keeping the past clean and moving forward with a better structure.
Not sure where to begin? Browse three sample category systems — from a minimal one-level setup to a comprehensive household budget — with guidance on which fits your situation and how to grow from one to the next.