To review a full year in the app:

1. Open Reports
2. Set the period filter to Year and pick the year you want to inspect
3. The Overview shows the headline figures; switch to the P&L, Cash Flow, Clients, or Forecast view for more detail
4. Turn on the comparison filter to see the year next to a previous year

Tip: The include open invoices filter controls whether unpaid invoices count toward the totals.