Yes, you can search for nice apartments that are in the low income bracket at aptfinder.org

No the federal tax brackets would NOT be your average income tax rate on your income.

Each separate federal tax bracket amount is your marginal tax rate for that amount of your taxable income that is in that bracket amount.

Yes when you would have taxable income in the lowest tax bracket yes you would have a federal income liability when your income tax return has been completed correctly to the line on your 1040 federal income tax return that says taxable income Line ? ? ?

Then the next line says amount of income tax form 1040 line 44 $1 dollar and could be more than $1.

And the amount of your income liability would start at 1 dollar and increase from that point depending on the how much taxable income you have on the taxable income line of your 1040 income tax return.

SS contributions are not a deduction from taxable income. The tax bracket schedule is on taxable income, that is after all inclusions and exemptions/deductions.

What tax bracket would a married couple with one dependent and an annual income of $150,000 be in?