When you turn a use case off in Settings → Use Cases (Wedding, Realtor, Rental, and so on), ExpenseBot keeps everything by default — your tags, your tagged expenses, and any past reports all stay. They're your history, so we don't touch them.
If that use case added tags you never actually used (no expense is tagged with them), we'll offer to tidy those out of your tag list so your dropdown stays clean. You'll see a quick Remove / Keep prompt:
- Remove clears only the unused tags — and there's an Undo if you change your mind.
- Tags that are on real expenses are never removed. Your data and reports are safe.
- Keep leaves everything exactly as it is.
So you can't lose any tagged data this way. The only thing that can be removed is an empty, never-used tag — and only if you choose to.