500 (2D): Maryland Corporation Income Tax Return (2D) (2025)
Maryland · Comptroller of Maryland · Used for tax years 2025
Maryland Form 500 is the 2025 Corporation Income Tax Return. It reports federal taxable income, Maryland adjustments and modifications, Maryland taxable income, tax, payments, credits, and any balance due or refund. It can also be used to amend a previously filed return.
Who files this form
Form 500 is Maryland’s corporation income tax return for tax year 2025. The form lists federal return types including Form 1120, Form 1120-REIT and Form 990T.
If you file federal Form 1120S, the form directs you to file Maryland Form 510 instead.
The supplied form does not give complete rules for determining which corporations must file.
What you'll need
- Attach a copy of the federal income tax return through Schedule M2.
- Have the corporation’s 9-digit Federal Employer Identification Number (FEIN), organization or incorporation date, and 6-digit business activity code available.
- If claiming a net operating loss, attach copies of the federal form for the loss year and Form 1139.
- If reporting nonresident tax paid on the corporation’s behalf by pass-through entities on line 15f, attach Maryland Schedule K-1 (510/511).
- Attach supporting schedules for other additions on line 7f and other subtractions on line 8b.
- Have records of estimated payments, any previous-year overpayment credit, extension payments, and applicable tax credits or withholding available.
- If amending, show the computation of changes in detail and attach schedules as necessary.
- For direct deposit, provide the account type, routing number, account number and name on the bank account.
How to file
Electronic filing: You must file Form 500 electronically to claim business tax credits from Form 500CR.
Paper filing: Print using blue or black ink only. Complete the officer’s signature and date fields and include all required pages of Form 500. The form identifies the preparer’s signature and PTIN as required by law.
Mail to:
Comptroller of Maryland
Revenue Administration Division
110 Carroll Street
Annapolis, Maryland 21411-0001
Make a check or money order payable to Comptroller of Maryland. In blue or black ink, include the FEIN, tax year and tax type on the payment. The form marks a place to staple the check.
Common mistakes
- Missing payment details: The form warns that omitting the FEIN, tax year or tax type from your check or money order will delay payment processing.
- Missing pages or attachments: Include all required pages of Form 500 and attach the federal return through Schedule M2.
- Filing on paper to claim Form 500CR credits: The form requires electronic filing for these credits.
- Entering an NOL carryover on line 7c: The form specifically says not to enter it there. Line 5 is for the adjusted federal NOL carryforward available from previous tax years.
- Using negative amounts in adjustment fields: Maryland adjustment and addition/subtraction modification entries must be positive. Line 9 separately directs you to enter a negative amount if its result is below zero.
- Incorrect or unclear bank details: Verify that all direct deposit account information is correct and clearly legible.
Questions people ask
What tax rate does the form use?
Line 14 directs you to multiply Maryland taxable income on line 13 by 8.25%.
Can I request direct deposit of a refund?
Yes. Check the direct deposit authorization box and complete the bank account fields. There is also a box to indicate that the refund will go to an account outside the United States.
How do I identify an amended return?
Check the “Amended Return” box. In the amendment section on page 3, check the reason or reasons for amending, explain the changes and show the computation in detail. Attach schedules or additional pages as needed.
Who completes the apportionment section?
The income apportionment section is for multistate corporations whose apportionment factor is less than 1. Otherwise, the form directs you to skip to line 13. Schedule A on page 4 computes the apportionment factor.