A reckoner, or someone who maintains financial matters for a person(s).
(accounting) One who is skilled in, keeps, or adjusts, accounts; an officer in a public office, who has charge of the accounts.
(accounting) One whose profession includes organizing, maintaining and auditing the records of another. The records are usually, but not always, financial records.
“What transactions were considered and disregarded during the company's process of accounting?”
“In his accounting of the history of Sufism, Bennett adopted a distinction between northern and southern Sufism in his teachings.”
“What accounting can you give for this travesty?”
accountancy
(uncountable, Britain, New Zealand, accounting) The function of compiling and providing financial information primarily by reports referred to as financial statements. Accounting includes bookkeeping, systems design, analysis and interpretation of accounting information.
(countable, accounting) A company or organisation that performs such a function.