Doubt in Yearly Income Calculation for Payslip Generation

[unreal0901]

Currently, the formula for calculating yearly income is:

yearly_income = (₹1,00,000 / num_days) × 365 ≈ ₹12,16,666.67

However, since num_days varies depending on the month, the calculated yearly income fluctuates. This seems incorrect, as the yearly income should remain constant.

If the contract is based on a monthly salary, shouldn't the yearly income be determined by the number of months .

Wouldn't it be more accurate to calculate yearly income by simply multiplying the fixed monthly salary by 12, rather than deriving it from daily income? Since the monthly income is already predefined, why introduce daily income as an intermediary step?

Additionally, is this the correct approach for tax calculation? The current method bases taxation on daily income, but shouldn't it be calculated directly using the fixed monthly salary?

Suppose i want to generate a payslip for feb, how can make the feb salary same as monthly basic salary.