Can I get an updated refund after filing an amendment?I eFiled my 2021 ITR using TurboTax on March 2022. I received W2 from a backwage settlement on April 2022.

It doesn't matter when you received the W-2. What matters is when you received the back wages. You report the back wages on your tax return for the year that you received the payment, even if it's back wages for an earlier year. Did you receive the back wages in 2021 or in 2022? Is the W-2 for 2021 or for 2022?

If you received the back wages in 2021 and the new W-2 is for 2021, you have to file an amended 2021 tax return. Your refund will be adjusted for the additional wages. Your refund could be higher or lower, depending on how much tax was withheld from the back wage payment.

If you received the back wages in 2022 and the new W-2 is for 2022, you do not amend your 2021 tax return. You will include the W-2 in your 2022 tax return. Hold on to the 2022 W-2 until you file your 2022 tax return. It might be difficult to get a replacement for the W-2 if you lose it.

If you received the back wages in 2022 and the new W-2 is for 2021, the employer is reporting it incorrectly. Ask them to issue a corrected 2021 W-2 showing no back wages, and a new 2022 W-2 for the back wages that were paid in 2022. Refer them to the IRS instructions for Form W-2 and IRS Publication 957 regarding the reporting of back pay. They might not issue the 2022 W-2 until January 2023. If the employer has reported the settlement incorrectly, you might want to ask the lawyer who handled the settlement for help getting the employer to correct it.