H&R Block 3935 Mission Ave, Oceanside, CA92058 This is the local branch of the national H&R Block tax service and accounting consulting business. It is one of the…More locations that are opened throughout the year during basic business hours. The store will open for extended hours during the income tax time period each year (Jan – April 15.) Agents will assist in preparing all tax forms for federal, state and local taxes for individuals. It also will assist small businesses that have an accounting department or person designated to do all accounting. H&R guarantees its work and if there are any errors, penalties or additional money wanted by the government, it will pay the difference. It also offers cash advances if a client is going to receive a refund.