Form 1040 – U.S. Individual Income Tax Return
The main federal income tax form for individuals, reporting income, deductions, credits, and taxes owed.
Schedule C (Form 1040) – Profit or Loss From Business
Used by sole proprietors to report business income and expenses, calculating net profit or loss.
Form 941 – Employer’s Quarterly Federal Tax Return
Employers file quarterly to report payroll taxes withheld, including income tax, Social Security, and Medicare.
Form W-4 – Employee’s Withholding Certificate
Employees complete this to determine how much tax an employer should withhold from their paychecks.
Form W-9 – Request for Taxpayer Identification Number (TIN)
Provided by contractors, freelancers, or vendors to businesses, supplying their TIN for 1099 reporting.
Form SS-4 – Application for Employer Identification Number (EIN)
Used by businesses to obtain a federal EIN, required for opening bank accounts, hiring employees, and filing taxes.
Form 1120-S – U.S. Income Tax Return for S Corporations
Filed by S-corps to report income, losses, and credits, with tax liability passed through to shareholders.
Form 1099-MISC – Miscellaneous Information
Reports payments such as rent, prizes, awards, or contractor income made outside regular employment.
Publication 334 – Tax Guide for Small Business
An IRS guide explaining income, expenses, deductions, and filing requirements for sole proprietors and small businesses.
Form 2290 – Heavy Highway Vehicle Use Tax Return
Required for owners of heavy trucks (55,000+ pounds) to pay the annual federal highway use tax.
Form 720 – Quarterly Federal Excise Tax Return
Filed by businesses to report and pay federal excise taxes on goods and services like fuel, air travel, and certain environmental items.