It was a very short lived investment, as the delinquent tax payer redeemed the property after the month.

In many cases the difference is substantial, and can impact the borrowers ability to maintain both loan/contract payment and tax payment.

Although, he did mention not wanting to make two tax payments anymore (subject property is not his main residence), and that he's on a fixed income.

Also, you can ask if tax payments are normally paid on a monthly basis.

@Derek SavageThe ONLY reason I got my degree, was because I am a veteran and had the Taxpayers pay for it.

@Eric WeltyI've not heard of separate state/local treatment of this issue...Generally speaking deductions are properly allocable to the return of the taxpayer that bears the burden of risk of loss. 

Problem is no matter how you look at it, Affordable housing gets paid for one way or another by taxpayers/Government.

What’s your mortgage/innsurance/tax payments monthly?

This is an interesting topic, @Eamonn McElroy that section only talks about transferring to a personal use and not back again, i found this just now:(C)Property reacquired by the taxpayer Under regulations, property which is disposed of and then reacquired by the taxpayer shall be treated for purposes of computing the deduction allowable under subsection (a) as if such property had not been disposed ofThis is in 168: 26 subtitle A,Chapter 1,Subchapter B, part 6(i)7c here is a link to the section:https://www.law.cornell.edu/uscode/text/26/168would that apply in this case?

But to assume simplicity for the sake of the model for a single taxpayer I would recommend factoring in the 'wage and capital' factor of the QBI limitation.