After ascertaining the total income, i.e., income liable to tax, the next step is to compute the tax liability for the year. Tax liability is to be computed by applying the rates prescribed in this regard. For rates of tax, refer "Tax Rate" section. Following table will help in understanding the manner of computation of the total tax liability of the taxpayer.
Computation of total income and tax liability for the year:-
Income from salary XXXXX
Section 80C to 80U provides certain deductions which can be claimed from Gross Total Income (GTI). After claiming these deductions from GTI, the income remaining is called as Total Income. In other words, GTI less Deductions (under section 80C to 80U) = Total Income (TI). Total income can also be understood as taxable income. Following table gives a better understanding of the difference between GTI and TI
The concept of marginal relief is designed to provide relaxation from levy of surcharge to a taxpayer where the total income exceeds marginally above Rs. 1 crore or Rs. 10 crore, as the case may be. Thus, while computing surcharge, in case of taxpayers (i.e. Individuals/HUF/AOP/BOI/artificial juridical person) having total income of more than Rs. 1 crore, marginal relief shall be available in such a manner that the net amount payable as income-tax and surcharge shall not exceed the total amount Source