How would I report an note receivable income for the installment sale of stock back to a privately held business?

[JessSBFP]

Here are the facts:

Stock bonus plan payout to employee and employee turns around and immediately sells the stock back to the company in exchange for a note receivable.

How would the income from the note receivable be reported each year (e.g. ordinary income, return of basis, capital gain, etc.)?

[sjrcpa]

Form 6252 Installment sale.

Interest payments go on Schedule B.