Fill out IRS forms
with AI.

IRS forms cover a broad range of tax reporting and compliance obligations — from filing income and business returns to estimating quarterly payments, reporting gambling winnings, and notifying the IRS of address changes. Whether you're a sole proprietor reporting business income on Schedule C, a partner in a business filing Form 1065, or a self-employed individual calculating estimated taxes with Form 1040-ES, these forms are essential tools for meeting your federal tax obligations accurately and on time. Mistakes or omissions can lead to penalties, delayed refunds, or unwanted IRS correspondence.

🏆 44,783+ forms filled
⭐ 98.2% accuracy
🔒 Enterprise-grade security
Continue with Google
OR

By continuing, you acknowledge Instafill's Privacy Policy and agree to get occasional product update and promotional emails.

Form 5405 · Filled by Instafill.ai in 6 sec

Form 5405 filled by Instafill.ai

About IRS forms

This category includes forms relevant to individuals, small business owners, S corporation shareholders, and partnerships. Some forms apply to relatively common situations — like authorizing an e-filed return with Form 8879 or updating a business address with Form 8822-B — while others address more specific circumstances, such as repaying a First-Time Homebuyer Credit or calculating uncollected payroll taxes on Form 8919. Regardless of the situation, accuracy and completeness are critical, since the IRS uses these documents to verify income, withholding, and tax liability.

For anyone who finds tax paperwork time-consuming or confusing, tools like Instafill.ai use AI to fill these forms accurately in under 30 seconds, making it easier to stay on top of deadlines without spending hours deciphering instructions.

Forms in This Category

Form Name Pages
1. Form 5405, Repayment of First-Time Homebuyer Credit 1
2. Form 8879, IRS e-file Signature Authorization 2
3. Form 107, Statement of Financial Affairs 12
4. State of Hawaii Department of Commerce and Consumer Affairs (DCCA) Contractors License Board – Application for Contractor's License (Sole Proprietor) (CT-36) with supporting forms (Experience Certificate CT-03, Contractors Financial Statement CT-02, and Chronological History of Projects/Project List) 26
5. Schedule E (Form 1120-S), Shareholder’s Stock and Debt Basis Limitations 2
6. Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship) (2017) 2
7. Department of Home Affairs — Appointment or cessation of a registered migration agent, legal practitioner or exempt person providing immigration assistance (Appointment notification form) 6
8. Australian Department of Home Affairs — Application for a Protection visa (subclass 866) (Form 866) 34
9. Form 8919, Uncollected Social Security and Medicare Tax on Wages 1
10. Form 1399 – Declaration of Service (Department of Home Affairs, Australia) 13
11. Form W-2G, Certain Gambling Winnings (Rev. January 2026) 7
12. Ohio Department of Commerce Table of Heirship (Division of Unclaimed Funds) 1
13. Form 8822-B, Change of Address or Responsible Party — Business 1
14. 2026 Form 1040-ES, Estimated Tax for Individuals 15
15. Form W-2G (Rev. January 2026), Certain Gambling Winnings 7
16. Form 8822-B (Rev. December 2019), Change of Address or Responsible Party — Business 1
17. Form 1065, U.S. Return of Partnership Income 6
Fill Out These Forms Automatically with AI
Let Instafill.ai handle the paperwork. Upload any PDF form and get it completed in seconds.
  • 🔒 Enterprise-grade security & data encryption
  • ✅ 99%+ accuracy powered by AI
  • 📄 1,000+ forms from all industries
  • ⏱ Complete forms in under 60 seconds
Try Instafill.ai Free