D 400 2026

1. Click ‘Get Form’ to open the d 400 in the editor.
2. Begin by entering your Social Security Number and your spouse’s if applicable. Ensure you fill in the circles as instructed.
3. Provide your full name in capital letters, followed by your mailing address, including city, state, and zip code.
4. Indicate your filing status by filling in one circle only from the options provided (e.g., Single, Married Filing Jointly).
5. Complete the income sections by entering your Federal Adjusted Gross Income and any deductions as specified on the form.
6. If applicable, fill out the tax credits section and calculate your total tax due or refund based on the instructions provided.
7. Finally, sign and date the form. If prepared by someone else, ensure they also sign where indicated.

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