Form 1040 is the most common tax form used by individuals to report their annual income and calculate their tax liability.

Form 1120 is used by corporations to report their annual income and expenses, and to calculate their tax liability.

Form 1065 is used by partnerships to report their annual income and expenses, and to calculate their tax liability.

Form 1041 is used by trusts to report their annual income and expenses, and to calculate their tax liability.

Schedule C is used by individuals to report income from their self-employment activities, such as operating a business or providing professional services.

Schedule D is used by individuals to report capital gains and losses from the sale or exchange of capital assets, such as stocks, bonds, and real estate.

Schedule B is used by individuals to report interest income from sources such as savings accounts, bonds, and certificates of deposit.

Schedule E is used by individuals to report dividend income from stocks and other investments.

Schedule E is used by individuals to report rental income and expenses from real estate properties.

Schedule F is used by individuals to report farm income and expenses from agricultural activities.

Form 1099-G is used to report income from unemployment benefits received from state or federal government agencies.

Form 1099-R is used to report income from pensions and annuities, including distributions from retirement accounts such as IRAs and 401(k)s.

Form SSA-1099 is used to report income from Social Security benefits received from the Social Security Administration.

Form RRB-1099 is used to report income from railroad retirement benefits received from the Railroad Retirement Board.

Form W-2G is used to report income from gambling winnings, such as winnings from slot machines, blackjack, poker, and bingo.