Pull 3 months of statements for every credit card and bank account.
ContextThree months is the minimum needed because some subscriptions bill quarterly and won't appear in a single month's statement. Flag any charge that recurs in two or more of the three months from the same merchant — this pattern identifies a subscription even when you don't recognize the name. A charge labeled 'ACME DIGITAL INC' that appears consistently is a subscription even if you have no memory of signing up.

