What you describe is an installment sale of inherited property. The basis is the fair market value as of the date of death, while the sale price is the agreed-upon value the siblings are paying for the portion you sold. If those numbers are the same, you will have no gain or loss on the sale. If the payments don't include an interest component, you would have no interest income to report.
To test if this income is taxable, you may enter the information into TurboTax and let the program help you determine if it should be reported.
To enter an installment sale (Form 6252), use the Find/Search box in the TurboTax header and type in "installment sales." Hit Enter, then click on "jump to installment sales." You will see a screen titled "Any other property sales." Check the box titled "sales of real estate, cars or anything else for which you receive payments over two or more years." Click Continue & the interview will guide you from there.
In general, inheritances are not reported on a tax return until or unless you sell them.
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