It is a valued list of everything you were holding at your fiscal year end, filed with your Revenue District Office on the BIR's prescribed schedules. Merchandise, raw materials, work in process, finished goods and supplies are listed separately.For a calendar-year business the deadline is normally 30 January, covering the 31 December position, but the date follows your fiscal year and your RDO is the authority on it. A separate list is also required when you start a business, stop one, or change what it does.The most common reason a list is returned is format rather than arithmetic: the prescribed schedules are specific. It also has to reconcile to your books.