DELAWARE 2026

1. Click ‘Get Form’ to open the DELAWARE Underpayment of Estimated Taxes form in the editor.
2. Begin by entering your first name and last name in the designated fields at the top of the form. Ensure that you also input your taxpayer ID accurately.
3. Indicate if you are a farmer or fisherman by checking the appropriate box, and specify if you are using the annualization of income method.
4. In Part 1, calculate your required annual payment by entering 90% of your 2021 Delaware tax liability in Line A, followed by 100% or 110% of your previous year's liability in Line B. The smaller amount will be recorded in Line C.
5. Proceed to Part 2 and enter any estimated tax payments made in Line F and any withholding amounts in Line G. Add these amounts together for Line H.
6. Continue filling out subsequent sections as instructed, ensuring all calculations are accurate to avoid penalties.

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