Publication 550 - Investment Income and Expenses This publication provides information on the tax treatment of investment income and expenses. It explains what investment income is taxable and what investment expenses are deductible. It explains when and how to show these items on your tax return. Publication 915 - Social Security and Equivalent Railroad Retirement Benefits This publication explains the federal income tax rules for social security benefits and equivalent tier 1 railroad retirement benefits. Receipt of interest on tax exempt bonds may impact the taxability of social security benefits, as described in this publication. Publication 1212, Guide to Original Issue Discount (OID) Instruments This publication helps brokers and other middlemen identify publicly offered original issue discount (OID) debt instruments they may hold as nominees for the true owners, so they can file Forms 1099-OID or Forms 1099-INT as required. It also helps owners of publicly offered OID debt instruments determine how much OID to report on their income tax returns. Tax Topic 403 - Interest Received Most interest that you either receive or is credited to an account that you can withdraw without penalty is taxable income in the year it becomes available to you. However, some interest you receive may be tax-exempt.