RI-1120C: Business Corporation Tax Return (2025)
Rhode Island · RI Division of Taxation · Used for tax years 2025
Form RI-1120C is Rhode Island’s 2025 Business Corporation Tax Return. It reports a corporation’s taxable income, Rhode Island adjustments and apportionment, credits, and payments to calculate tax due or an overpayment.
When it's due
For tax year 2025, Form RI-1120C is due on or before the 15th day of the 4th month following the close of the taxable year.
What you'll need
- Attach a complete copy of your federal return, including all pages, schedules and K-1s.
- If claiming pass-through withholding, include a completed RI-1120C Schedule D and copies of the 2025 RI K-1s issued by each pass-through entity.
- Attach schedules for any net operating loss deduction or research and development adjustments you claim.
- If claiming the Tax Incentives for Employers modification, attach Form RI-107.
- For Schedule F, attach schedules for dividends from payers liable for the specified Rhode Island taxes, interest on certain U.S. obligations, and interest on U.S. possessions' obligations or other interest exempt under Rhode Island law, as applicable.
Have your corporation's federal employer identification number, Rhode Island Secretary of State ID number, NAICS code, income and asset records, and payment information ready to complete the return.
How to file
Complete the return and applicable schedules, include the required attachments, and have an authorized officer sign and date it. The form also includes a paid preparer signature section.
Mail to:
RI Division of Taxation
One Capitol Hill
Providence, RI 02908
If you have an amount due with the return, the form directs you to use Form BUS-V.
Common mistakes
- Missing pass-through withholding attachments: The form warns that withholding claimed on page 2, line 17b will be disallowed if you do not include a completed RI-1120C Schedule D and the RI K-1s.
- Withholding totals that do not match: Schedule D, line 1v must equal the pass-through withholding claimed on page 2, line 17b.
- An incomplete federal return attachment: Include all federal return pages and schedules, including all K-1s.
- Too few decimal places: Carry the Rhode Island apportionment ratio to six decimal places.
Questions people ask
What tax rate and minimum tax appear on the form?
The form calculates Rhode Island income tax at 7% of Rhode Island adjusted taxable income. After subtracting Rhode Island credits, line 13 cannot be less than the $400 minimum tax.
Can I have an overpayment refunded or applied to the next year?
Yes. The 2025 form has a line for the amount of overpayment to credit to 2026 and a separate line for the remaining amount to be refunded.
What information is needed for a combined return?
The form has a Combined Return checkbox and asks how many companies are included in the return.
How do I calculate the Rhode Island apportionment ratio?
On Schedule H, divide line 1j, Column A (Rhode Island), by line 1j, Column B (Everywhere). Calculate the ratio to six decimal places and enter it on Schedule H, line 2 and Schedule A, line 5.