According to Section 23(1)(a) of the Income Tax (I-T) Act, the annual value of your property is the amount it is expected to earn you when let-out from year-to-year. Based on four factors, the annual value of a property is arrived at.
A) Municipal value
For the purpose of charging local taxes, municipal bodies evaluate your property.
B) Actual rent received or receivable
This is the amount you receive from your tenant on an annual basis. However, your actual income would be calculated on the basis of who pays the utility bills of the rented unit.
C) Fair rent
The rent that similar properties with similar amenities in similar areas earn is the fair rental value.
D) Standard rent
Areas where the Rent Control Act is in place, a standard rate is fixed. Landlords of such property have to stick to this amount, irrespective of the market value of their properties.
Now, the annual value of your property will be the highest among these amounts—the rent received or receivable, the fair market value or the municipal valuation.
Refer: gross-annual-value-of-house-property