I purchased a new home.My buyer's agent paid me cashback and asked W-9 from me but didnt issue any 1099 form.Is this cashback taxable?How to handle this while filing tax?

[IndianExpat]

Cashback amount is around $20K. He asked w9 from me but didnt give any 1099MISC or 1099NEC or any form to me. Do i need to declare this while filing tax? Is this taxable income? What's the best way to handle this?

[Mike9241]

Not taxable, but it does reduce the tax basis of the home. 

[IndianExpat]

Thank you. Do I still need to put any entry declaring it and then claiming credit in TurboTax desktop software or submit any form?