Tax Information
Tax Form websites
IRS website
State of Pennsylvania Tax Site
Estimated Tax Forms and Information
Some useful forms to consult for estimated taxes. Note the form number and the instructions that go with it to figure out what you need to use.
| Form Number | Description |
| 990-W | Estimated Tax on Unrelated Business Taxable Income for Tax-Exempt Organizations |
| 1040-ES | Estimated Tax for Individuals |
| 1040-ES (NR) | U.S. Estimated Tax for Nonresident Alien Individuals |
| 1041-ES | Estimate Income Tax for Estates and Trusts |
| 1041-T | Allocation of Estimated Tax Payments to Beneficiaries |
| 1120-W | Estimated Tax for Corporations |
| 2210 | Underpayment of Estimated Tax by Individuals, Estates and Trusts |
| 2210-F | Underpayment of Estimated Tax by Farmers and Fishermen |
| 2220 | Underpayment of Estimated Tax by Corporations |
| 4466 | Corporation Application for Quick Refund of Overpayment of Estimate Tax |
| 8816 | Special Loss Discount Account and Special Estimated Tax Payments for Insurance Companies |
| 8842 | Election to Use Different Annualization Periods for Corporation Estimated Tax |
| 505 | Tax Withholding and Estimated Tax |
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