Even if your gross income is below the threshold that ordinarily requires you to file an income tax return, the IRS is encouraging you to do so in order to receive your Economic Impact Payments (EIPs). Fortunately, there is a simplified return option in lieu of a 2020 return so you may receive EIP 3; only a few lines need to be completed. You can file on paper; write “Rev. Proc. 2021-24” at the top of the first page of the return. If you e-file, show $1 of adjusted gross income (even if it really is zero). Other details for the simplified return option may be found in Rev. Proc. 2021-24 at https://www.irs.gov/pub/irs-drop/rp-21-24.pdf.
Debt secured by a principal residence or second home to the extent of the excess of fair market value over acquisition debt. An interest deduction is generally allowed for home equity debt up to $100,000 ($50,000 if married filing separately).