The Accountancy Model is an accounting math book in development by Tim Riley. Also being developed is the corresponding The Accountancy Model Examples. Paperback versions of these books are available at a nominal cost.

The Accountancy Model assists the Accountancy Profession to model a firm's economic events. Economic events are observed and then processed through a highly defined (and many times complicated) algorithm. The basic model begins with the identity:

Assets = Liabilities + Owners' Equity

Each of Assets, Liabilities, and Owners' Equity expand to the many accounting elements, and each of the many accounting elements further expand to the many accounts. After a specific economic event is observed (or more specifically, after a transaction occurs), the appropriate accounting model is mathematically applied. The output from the model is a journal entry recording the adjustments needed in the appropriate accounts.