Assessment year: In simple words, it is the year that comes after the financial year. All taxpayers pay taxes in the assessment year because it is in this year that taxes are calculated on the income earned in the previous year.
Assessment year consists of the 12 months that come right after the financial year ends, and you file the income tax return for the previous year (FY).
The difference between the assessment year (AY) and the financial year (FY) is given below:
The income tax return is filed in the assessment year as the income earned in FY is evaluated and taxed in AY, so the ITR forms have AY mentioned on them. You cannot tax the income in a financial year because it is impossible to tax the income before it is earned, so taxing it in the following year is the best option.
Also, you cannot predict the income earned in the FY before it ends because there could be many scenarios, like a job change, new investments, etc. Hence, the assessment year always starts after the financial year ends.