INDIVIDUALS

Form 1040
US Individual Income Tax Return: Annual Income tax return filed by citizens or residents of the United States.

Form 1040A
US Individual Income Tax Return: Shorter version of Form 1040 allows you to report limited types of income and to claim certain adjustments.

Form 1040-ES
Estimated Tax for Individuals: Figure and pay your estimated tax on income that is not subject to withholding.

Form 1040EZ
Income Tax Return for Single and Joint Filers with No Dependents: If you file Form 1040EZ, you cannot itemize deductions or claim any adjustments to income or tax credits (other than the earned income credit).

BUSINESSES

Form 1099-MISC
Miscellaneous Income: File this form for each person to whom you have paid various income during the year.

Form 941
Employer’s Quarterly Federal Tax Return: Employers who withhold income taxes, social security tax, or Medicare tax from employee’s paychecks or who must pay the employer’s portion of social security or Medicare tax.

Form W-4
Employee’s Withholding Allowance Certificate: Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay.

Form W-9
Use this form to provide your correct TIN to the person who is required to file an information return with the IRS to report, for example, income paid to you, real estate transactions, mortgage interest you paid, acquisition or abandonment of secured property, cancellation of debt, or contributions you made to an IRA.

Form I-9
Employers must complete this form to document verification of the identity and employment authorization of each new employee (both citizen and noncitizen) hired after November 6, 1986, to work in the United States.

Additional forms available on the IRS Website