1; Social Security recipients must include in gross income as much as 50% of the Social Security benefits received and as little as none of the benefits received. TRUE OR FALSE? WHY 2: Taxpayers are required to pay the IRS any tax as a basis for bringing litigation in the U.S. tax court. T OR F? WHY? 3: IN 2021, Taxpayers are allowed to deduct mortgage interest on up to $1,000,000 of acquisition debt for their qualified residence and on up to $500,000 of home-equity debt. TRUE OR FALSE? WHY? 4: Taxpayers meeting certain home ownership and use requirements can permanently exclude up to $1,000,000 of realized gain on the sale of their principal residence. T OR FALSE WHY?