Note: You must complete a separate Form 3911 for each refund for which you are requesting information. Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax.Check the box below that indicates your reason for filing Form 843. Tax. Abatement or refund of tax other than income, estate, or gift tax. I overpaid my business tax. How do I request a refund? Fill out the Business Tax Refund Request form when you need to get money back from the City for an overpayment. We issue Notice CP12 when we correct one or more mistakes on your tax return, and: The overpayment is different from the one you expected. This notice provides taxpayers with information on the extensions of time to file returns and remit tax and the waivers from penalty and interest. Non Tax filers can request an IRS Verification of Non-filing of their 2022 tax return status, free of charge, from the IRS in one of two ways: Online; By Paper.