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Estimated tax forms are used by individuals who receive income that isn't automatically subject to withholding — such as self-employment earnings, freelance income, dividends, interest, and rental income. Unlike traditional employees who have taxes withheld from each paycheck, these taxpayers are responsible for calculating and submitting their own tax payments on a quarterly basis throughout the year. Failing to do so can result in underpayment penalties from the IRS, making these forms an essential part of staying compliant with federal tax obligations.
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About estimated tax forms
The most common form in this category is Form 1040-ES, Estimated Tax for Individuals, which includes a worksheet to help you estimate what you owe, along with payment vouchers for each quarterly due date. This form is typically used by self-employed individuals, gig workers, retirees with investment income, and anyone whose withholding doesn't fully cover their annual tax liability. Whether you're filing for the current tax year or planning ahead for 2026, understanding how to correctly calculate and submit estimated payments can save you from unexpected penalties at filing time.
Tools like Instafill.ai use AI to fill these forms in under 30 seconds, handling the data accurately and securely — a practical time-saver for anyone navigating quarterly tax obligations on their own.
Forms in This Category
| Form Name | Pages | |
|---|---|---|
| 1. | Form 1040-ES, Estimated Tax for Individuals | 12 |
| 2. | 2026 Form 1040-ES, Estimated Tax for Individuals | 15 |
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