IRS Form Quick-Read Index

Reference

Forms

• 1040 U.S. Individual Income Tax ReturnPurpose: The main personal income-tax return. Income, deductions, credits, total tax, and balance due / refund. Schedules 1-3 cover other income, additional credits, and other taxes.
• Schedule C (1040) Profit or Loss From BusinessPurpose: Sole proprietor or single-member LLC reports business income and expenses. The result flows to Form 1040 Schedule 1 and to Schedule SE.
• Schedule SE (1040) Self-Employment TaxPurpose: Computes Social Security and Medicare tax on self-employment net earnings. 92.35% adjustment, SS wage-base cap, Additional Medicare 0.9% above the threshold, deductible half.
• Schedule E (1040) Supplemental Income and LossPurpose: Rental real estate, royalties, partnerships, S-corporations, estates, trusts, REMICs. Each category has its own part on the form.
• Form 4562 Depreciation and AmortizationPurpose: Section 179, bonus depreciation, MACRS, listed-property depreciation. Required when claiming depreciation in the placed-in-service year or for listed property.
• Form 941 Employer's Quarterly Federal Tax ReturnPurpose: Employer reports federal income tax withheld and employee + employer FICA each quarter. Filed by the last day of the month after each quarter.
• Form W-9 Request for Taxpayer Identification Number and CertificationPurpose: U.S. payee gives a TIN to the payer so the payer can issue a 1099. No filing required; the payee returns it to the requester.
• Form 1099-NEC Nonemployee CompensationPurpose: Payer reports $600+ paid to a non-employee for services. Replaces the 1099-MISC box 7 path retired in 2020. Due Jan 31 to recipient and IRS.
• Form 1099-K Payment Card and Third Party Network TransactionsPurpose: Third-party settlement organization (Venmo / PayPal / Stripe / Square) reports gross payments. The reporting threshold has shifted multiple times; verify the current-year threshold with the IRS.

Related tools

• State Sales Tax Nexus Quick-Read
• Self-Employment Tax (Schedule SE)
• Quarterly Estimated Tax