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Income forms cover a broad range of documents used to report, verify, and calculate earnings across nearly every financial situation — from filing your annual federal tax return to disclosing income in a family law proceeding or applying for a student loan repayment plan. This category includes IRS staples like Form 1040 (the standard individual income tax return

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About income forms

These forms are used by a wide range of people: individual taxpayers filing or correcting their returns, small business owners and self-employed workers reporting pass-through income, fiduciaries managing estates and trusts, nonresident aliens with U.S.-source income, and individuals navigating life events like bankruptcy, divorce, or Medicare adjustments. Organizations — including nonprofits and S corporations — also rely on income-related forms to stay compliant with federal and state tax obligations.

With 41 forms in this category spanning federal, state, and specialized contexts, knowing which form applies to your situation is half the battle. Tools like Instafill.ai use AI to help you fill out these forms accurately in under 30 seconds, making it easier to stay on top of deadlines and avoid costly errors — whether you're handling a straightforward 1040 or a more complex partnership return.

Forms in This Category

Form Name Pages
1. Form SSA-44, Medicare Income-Related Monthly Adjustment Amount - Life-Changing Event 8
2. Form 1040-X, Amended U.S. Individual Income Tax Return 2
3. Form 1041, U.S. Income Tax Return for Estates and Trusts 3
4. Form 1042-S, Foreign Person’s U.S. Income 7
5. Form 540, California Resident Income Tax Return 6
6. Form 568, LLC Income Return 7
7. Form FTB 3514, California Earned Income Tax Credit 4
8. Form 1040-C, U.S. Departing Alien Income Tax Return 4
9. Form 4137, Social Security and Medicare Tax on Unreported Tip Income 2
10. Form 990, Return of Organization Exempt From Income Tax 12
11. Form 8960, Net Investment Income Tax 1
12. Form 990-T, Exempt Org Business Income Tax Return 2
13. Form 945, Annual Return of Withheld Federal Income Tax 2
14. Form 1099-INT, Interest Income 7
15. Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return 4
16. Form 1120-S, U.S. Income Tax Return for an S Corporation 5
17. Form FL-150, Income and Expense Declaration 4
18. Form 1040-NR, U.S. Nonresident Alien Income Tax Return 2
19. Form 1065, U.S. Return of Partnership Income 6
20. Form 1040, U.S. Individual Income Tax Return 2
21. Form 122A-1, Chapter 7 Statement of Current Monthly Income 3
22. Arizona Form 285-I, Individual Income Tax Disclosure/Representation Authorization Form 1
23. Form SSA-8000-BK, Application for Supplemental Security Income (SSI) 24
24. Judicial Council of California Form FL-150, Income and Expense Declaration 4
25. Form 1120-S (2025), U.S. Income Tax Return for an S Corporation 5
26. Form SS-8 (Rev. December 2023), Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding 5
27. California Form 568 (2023), Limited Liability Company Return of Income 7
28. California Form 568 (2024), Limited Liability Company Return of Income 7
29. Form 1040-X (Rev. February 2024), Amended U.S. Individual Income Tax Return 2
30. Form 1120 (2025), U.S. Corporation Income Tax Return 6
31. 2023 Schedule IL-E/EIC, Illinois Exemption and Earned Income Tax Credit (Illinois Department of Revenue) 3
32. Supplemental Alternative Documentation of Income (for use when other income documentation is not available) 1
33. 2023 Form IL-1040-X, Amended Individual Income Tax Return (Illinois Department of Revenue) 2
34. Income Protection Claim Form (AIA New Zealand Limited) 5
35. Income Protection Claim Form (AIA New Zealand) 6
36. Income-Driven Repayment (IDR) Plan Request (PAYE, IBR, and ICR) — William D. Ford Federal Direct Loan (Direct Loan) Program and Federal Family Education Loan (FFEL) Programs (OMB No. 1845-0102) 10
37. Form APL-505, Taxpayer’s Earned Income Tax Credit Protest 1
38. California Schedule K-1 (541) (2025), Beneficiary’s Share of Income, Deductions, Credits, etc. 1
39. Form W-2G (Rev. January 2026), Certain Gambling Winnings 7
40. Momentum Wealth Retirement Income Option Application (WIS060E) 11
41. Form 1065, U.S. Return of Partnership Income 6
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