Switching jobs during the financial year is a great career move, but it often leads to a major headache during tax filing season. Many employees who change jobs mid-year are shocked to find an unexpected tax demand when filing their returns. This happens because of a duplication of tax benefits between the two employers. Let's understand why this happens and how to prevent it.

The Double Deduction Trap

When you join a new company mid-year, the new employer calculates your TDS by assuming they are your only employer for the year. This leads to two specific errors:

1. Duplicated Standard Deduction: Both your old and new employers give you the flat ₹75,000 standard deduction. When you file your ITR, you can only claim this deduction once. The tax portal will remove the duplicated ₹75,000 deduction, instantly increasing your taxable income and tax liability.
2. Duplicated Tax Slabs: Both employers apply the lower tax brackets (e.g., 5% or 10%) to your salary. When consolidated, your combined income may push you into the 20% or 30% tax bracket, resulting in a large unpaid tax bill.

How to Prevent Year-End Tax Demands (Form 12B)

To avoid a surprise tax bill, you must declare your previous salary and TDS details to your new employer using Form 12B. This enables your new employer to consolidate your income and deduct accurate TDS for the remaining months of the financial year.