When you sit down to file your income tax return, it may seem like you are providing an account of the government on your finances throughout the year. But the reality is that most of this data is already lying with the Income-tax Department. All thanks to forms like Form 26AS and the Annual Information Statement (AIS), your earnings, tax deposits, and significant financial transactions are all available to the department. Knowing these forms will assist you in filing your taxes correctly and prevent you from facing nasty surprises in the form of mismatch notices or delays in processing.