Need a list of Sponsor's documents for U.S. Tourist visa

[immihelp]

Hi,

I am working in the U.S on H1 B visa for Infosys Technologies Ltd. I would
like to know what all documents are required from my side if I am planning
to sponsor my parent's tourist visa.

Please also mention what all documents are mandatory in terms of IRS tax
returns, W2 forms etc.

Please reply on an urgent basis as I have to apply for my parent's visa
asap since they have already paid the visa application fees earlier in
this year.

Thanks in advance

[immihelp]

Read https://www.immihelp.com/usa-visitors-visa-sponsor-documents/

[immihelp]

Thanks for the information.

Can you tell me whether both the documents i.e. IRS tax returns as well as the W2s, are mandatory?

[immihelp]

Not mandatory but recommended.