A traditional IRA is an individual retirement arrangement (IRA), established in the United States by the Employee Retirement Income Security Act of 1974 (ERISA) (Pub.L. 93–406, 88 Stat. 829, enacted September 2, 1974, codified in part at 29 U.S.C. ch. 18). Normal IRAs also existed before ERISA.
The IRA is held at a custodian institution such as a bank or brokerage, and may be invested in anything that the custodian allows (for instance, a bank may allow certificates of deposit, and a brokerage may allow stocks and mutual funds). Unlike the Roth IRA, the only criterion for being eligible to contribute to a Traditional IRA is sufficient income to make the contribution. However, the best provision of a Traditional IRA — the tax-deductibility of contributions — has strict eligibility requirements based on income, filing status, and availability of other retirement plans (mandated by the Internal Revenue Service). Transactions in the account, including interest, dividends, and capital gains, are not subject to tax while still in the account, but upon withdrawal from the account, withdrawals are subject to federal income tax (see below for details). This is in contrast to a Roth IRA, in which contributions are never tax-deductible, but qualified withdrawals are tax free. The traditional IRA also has more restrictions on withdrawals than a Roth IRA. With both types of IRA, transactions inside the account (including capital gains, dividends, and interest) incur no tax liability.