What is Form 12B and how to use it effectively? If you are someone who has changed jobs in-between a year, you need to know about Form 12B so you don’t have to witness the double-tax shock witnessed by almost all who are unaware of this casualty. There is a straightforward solution to prevent this. Make sure you request Form 12B when you leave your prior employer. If they are unable to do so or in case they refuse to give it to you, you can download it from the official income tax website. You can complete filling out the form by taking the information from your payslip. Additionally, you can give this Form 12B to the new employer when you’re at your new job. Form 12B contains all the necessary details, including your salary, the tax withheld from it, the professional tax paid on your behalf, and the PAN and TAN of your employers. Your new employer can calculate your tax deductions for the remaining months of the fiscal year using the information supplied in this form. Another vital benefit of Form 12B is that your existing company will provide you with a combined Form 16 at the end of the year. If you don’t provide these facts, your present employer and your previous employer will each provide you a Form 16, and you will need to match them up. This is much easier to do than being taxed twice.