IRS Official References
All calculations on this site are based on the following official IRS publications and forms. Click each link to view the source document on IRS.gov.
📖 IRS Publications
| Publication 15 (Circular E) | Employer's Tax Guide | |
| Publication 535 | Business Expenses | |
| Publication 505 | Tax Withholding and Estimated Tax | |
| Publication 587 | Business Use of Your Home | |
| Publication 15-B | Employer's Tax Guide to Fringe Benefits | |
| Publication 560 | Retirement Plans for Small Business | |
| Publication 334 | Tax Guide for Small Business |
📝 Key IRS Forms
| Form 1040 | U.S. Individual Income Tax Return | View |
| Schedule C (Form 1040) | Profit or Loss From Business | View |
| Schedule SE (Form 1040) | Self-Employment Tax | View |
| Form 1040-ES | Estimated Tax for Individuals | View |
| Form 2210 | Underpayment of Estimated Tax | View |
| Form 8829 | Expenses for Business Use of Your Home | View |
| Form 7206 | Self-Employed Health Insurance Deduction | View |
🔗 Official IRS Links
All external links go to irs.gov official website. We are not affiliated with the IRS. These links are provided for reference only.