H&R Block is the world's largest income tax filing company. It offers income tax return filing services for salaried individuals via three distinct methods - Free Online self e-filing, assisted tax e-filing and In-person tax e-filing. It also develops and markets DIY income tax preparation software; and provides DIY tax services, including preparation of federal and state income tax returns, review of tax returns by a tax professional, access to tax tips, advice and tax-related news, use of calculators for tax planning, and error checking and electronic filing. In addition, the company develops and offers applications for mobile devices, which offer tax return preparation solutions and related services and products to clients. Further, it provides refund transfers, H&R Block Emerald Advance lines of credit, H&R Block Emerald Prepaid MasterCard, Peace of Mind Extended Service Plan, Tax Identity Shield, refund advance loans, and an Instant Cash Back refund option.