Maryland — Amended Corporation Income Tax Return
More about the Maryland Form 500X
We last updated Maryland Form 500X in August 2021 from the Maryland Comptroller of Maryland. This form is for income earned in tax year 2025, with tax returns due in April 2026. We will update this page with a new version of the form for 2027 as soon as it is made available by the Maryland government.
Other Maryland Corporate Income Tax Forms:
In addition to information about Maryland's income tax brackets, Tax-Brackets.org provides a total of 42 Maryland income tax forms, as well as many federal income tax forms. Here's a list of some of the most commonly used Maryland tax forms:
| Form Code | Form Name |
|---|---|
| Form 500E | Application for an Extension to File Corporation Income Tax Return |
| Form 500 | Maryland Corporation Income Tax Return |
| Fiduciary Booklet | Maryland Instructions for Fiduciaries |
| Form 510 | Pass-Through Entity Tax Return |
| Form EL102B | Maryland income tax payment voucher for business electronic filers |
View all 42 Maryland Income Tax Forms
Disclaimer: While we do our best to keep Form 500X up to date and complete on Tax-Brackets.org, we cannot be held liable for errors or omissions. Is this form missing or out-of-date? Please let us know so we can fix it!
Tax Form Sources:
- Maryland Comptroller of Maryland ( http://individuals.marylandtaxes.com/
) - Comptroller of Maryland Income Tax Forms ( http://forms.marylandtaxes.com/current_forms/ )