Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax. Use Form 843 to claim a refund or request an abatement of certain taxes, penalties, additions to tax, interest, and fees.Sample Form 1095B: This form is mailed to you along with one of the three sample letters below. Keep this with your other tax information. If you have overpaid the Internal Revenue Service (IRS), you may be able to receive a refund. A claim for refund is a request for reimbursement of amounts previously paid. Generally, if you have paid your balance in full you will file a formal claim. Find unclaimed property tax. Department of Tax and Collections (DTAC). While the IRS 501(c)(3) determination is still pending, the City Manager wrote a letter of support requesting the IRS to expedite processing of the.