Tax Practitioner Service Center Tax practitioners are an important resource for ensuring that residents and businesses comply with the District's tax laws. The Office of Tax and Revenue (OTR) has created this gateway to help tax practitioners easily find the information and services they need when serving their clients. If you need further assistance, remember to contact OTR's Tax Practitioner Hotline at (202) 727-1435. Assistance   Common Errors of Business Taxpayers Common Errors of Individual Income Taxpayers Frequently Asked Questions Taxpayer Appeal Rights Tax Law and Guidance What's New for 2009 Compliance   Audit Division Collection Division Estimated Tax Penalty   Credits   DC College Savings Plan DC Earned Income Tax Credit Real Property Tax Relief and Tax Credits Forms   Current Year Tax Forms Prior Year Tax Forms Recorder of Deeds Forms Uniform Commercial Code Forms   News and Outreach   OTR News Room Tax Practitioner Institute  Services   Business Tax Online Filing Federal/State E-File Program Individual Income Tax Online Filing IRS Tax Center for Small Businesses/Self-Employed UCC Financing Documents Online Filing