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Your not correct under many different circumstances.First property tax is 1.1% (fairly safe) with 2% annual increase (prop 13).Next expenses include a lot more than property tax and interest. 

Definitely a question for a tax attorney/accountant, especially with the dollar amounts involved. 

Bonus depreciation will finally be phased out in the 2027 tax year This is well said

Quote from @Melanie Baldridge: In 2025 the bonus depreciation rate is 40%.This means that if you bought a property for $1M in 2025, did a cost seg study and found $300K in eligible assets that you could depreciate, you could take 40% of that $300K as bonus depreciation to offset your income in the first year.40% of $300K = $120K.You then apply that $120K to the owner’s personal tax rate to find the final amount that they can defer in year 1.If your tax rate is 37%, you can defer $66.6K.This is a big deal even at the 40% bonus depreciation rate this year.It’s a massive benefit 

So I put $1600 on a credit card for a down payment and then pay $500 a month until the full amount was paid off.

My son currently lives in the townhouse b/c he is going to school and works in the area.Since he is young and starting out in life, I would like for him to only cover the basic costs (taxes, HOA, utilities) just enough for me to break even (I believe that will put him slightly little lower than market rent rates). 

For example, in my state PA there is an inheritance tax and many TAX auction properties originate from people passing away and the heir(s) not taking control over the estate and paying those property taxes.

Here are the key numbers:Potential purchase price: Mid-$400k rangeAppraised value: Estimated at ~$500kRehabbed comparable properties (comps): ~$580-600kMonthly PITI (with 5% down, including mortgage insurance): ~$3400First-year PITI (with 2-1 buydown): ~$2900Monthly income (after taxes): ~4-5kLiving expenses (utilities, groceries, etc.): ~$1600Savings available: ~15-20% of the purchase priceCash to close: ~$34kRehab estimate: ~$34kRemaining reserves: ~$20-25kTo fully fund the rehab, I’d need to come up with an additional ~$15k in the short term, which I anticipate paying back quickly once the rental portion is generating income.

Make sure to plan for the added rental income/ordinary expenses on your tax return.