After you file


@los2369 wrote:

Okay, I didn't receive any installments or payments from the Buyer, they had a loan and paid in full (financed, etc).  When I called the IRS they informed me I needed this form to clear my tax liability.  Is there another form you recommend? 


Amending the tax return for 2018 to report the sale should have produced a Schedule D and a Form 8949 but if your gains were less than the exclusion amounts there is no tax liability for the sale.

Has the IRS received your 2018 amended return?  You need to contact the IRS and question their reasoning for wanting the Form 6252.

 

As stated in the Form 6252 instructions for the purpose of the form - https://www.irs.gov/pub/irs-pdf/f6252.pdf

Use Form 6252 to report income from an installment sale on the installment method. Generally, an installment sale is a disposition of property where at least one payment is received after the end of the tax year in which the disposition occurs.