Calculating Income Tax for Specific Months: How Do You Do It from February to March?

Hi, how do I calculate income tax for a period of months, such as from February to March or from March to February?

Income Tax Calculation Period

Many companies and government organizations calculate income tax from March to February. In February, all income tax calculations are finalized and closed, and salaries for the month of March are typically paid in April. Therefore, the salary of March 11th corresponds to the financial year 2011-2012.