How to get a W2 from a business who is now closed?

Employers still have an obligation to send W-2's even if they close business. The IRS wants you to wait until February 15 for your W-2 arrive. If you do not receive it by then, follow the steps in the FAQ below.

https://ttlc.intuit.com/replies/3301808

the business is closed

If you cannot get a copy of your W-2, then you may be able to file your return using a “substitute W-2” but you will not be able to electronically file your return.  To do this, you would need have your final paystub from December and file using the numbers on that final paystub. 

See this TurboTax Help.

@vajrabhupen17

how can i get my W2, the employer is closed the business.

@vajrabhupen17, please follow the steps @JamesG1 stated above and you will be able to file your return, even if the business is closed.