Business Tax Service Center  This is a gateway for the services and information that businesses will need to comply with the District's tax laws. Feel free to call or visit our Customer Service Center for additional assistance. The eTaxpayer Service Center (eTSC) provides secure access to your DC business tax information. As a registered eTSC customer, you may file tax returns, remit payment via credit card* or electronic funds transfer, view account balance information, and correspond with the Office of Tax and Revenue. eTaxpayer Service Center (eTSC)   Log on for Existing Users 2011 Electronic Funds Transfer (EFT) Payment Guide* New User Registration  Tour the eTSC Online Filing Services   Combined Business Tax Registration Application (FR-500) Interest Calculator IRS Employer Identification Number (EIN) Application Uniform Commercial Code Filings Filing Information   Baseball-Related Fees and Taxes Collection Division Common Errors Electronic W-2 Filing Estimated Tax Penalty Forms/Publications IRS Tax Center for Small Businesses  Sales Tax Holiday Special Events Street Vendors Taxpayer Appeal Rights Taxicab and Limousine Information Form * A small fee is charged for credit card payments; however, electronic filers are not required to pay by credit card. Other payment options include electronic funds transfer (EFT) or payment by check.