There are several types of IRAs: Source – Wikipedia

• Traditional IRA – contributions are often tax-deductible (often simplified as “money is deposited before tax” or “contributions are made with pre-tax assets”), all transactions and earnings within the IRA have no tax impact, and withdrawals at retirement are taxed as income (except for those portions of the withdrawal corresponding to contributions that were not deducted). Depending upon the nature of the contribution, a traditional IRA may be a “deductible IRA” or a “non-deductible IRA”. Traditional IRAs were introduced with the Employee Retirement Income Security Act of 1974 (ERISA) and made popular with the Economic Recovery Tax Act of 1981.
• Roth IRA – contributions are made with after-tax assets, all transactions within the IRA have no tax impact, and withdrawals of contributed funds are tax-free. Named for Senator William V. Roth, Jr., the Roth IRA was introduced as part of the Taxpayer Relief Act of 1997.
  • myRA – a 2014 Obama administration initiative based on the Roth IRA
• SEP IRA – a provision that allows an employer (typically a small business or self-employed individual) to make retirement plan contributions into a Traditional IRA established in the employee’s name, instead of to a pension fund in the company’s name.
• SIMPLE IRA – a Savings Incentive Match Plan for Employees that requires employer matching contributions to the plan whenever an employee makes a contribution. The plan is similar to a 401(k) plan, but with lower contribution limits and simpler (and thus less costly) administration. Although it is termed an IRA, it is treated separately.
• Rollover IRA – no real difference in tax treatment from a traditional IRA, but the funds come from a qualified plan or 403(b) account and are “rolled over” into the rollover IRA instead of contributed as cash. No other assets are commingled with these rollover amounts.
• Conduit IRA – Tool to transfer qualified investments from one account to another. In order to retain certain special tax treatments, funds may not be commingled with other types of assets, including other IRAs.

The last two types, Rollover IRAs and Conduit IRAs, are viewed by some as obsolete under current tax law (their functions have been subsumed by the Traditional IRA), but this tax law is set to expire unless extended. However, some individuals still maintain these arrangements in order to keep track of the source of these assets. One key reason is that some qualified plans will accept rollovers from IRAs only if they are conduit/rollover IRAs.

A self-directed IRA is the considered the same by the tax code, but refers to IRAs where the custodian allows the investor wider flexibility in choosing investments, typically including alternative investments. Some examples of these alternative investments are: real estate, private mortgages, private company stock, oil and gas limited partnerships, precious metals, horses, and intellectual property. While the Internal Revenue Code (IRC) has placed a few restrictions on what can be invested in, the IRA custodian may impose additional restrictions on what assets they will custody. Self-directed IRA custodians, or IRA custodians who specialize in alternative investments, are better equipped to handle transactions involving alternative investments.

Some IRA custodians and some investment funds specialize in socially responsible investing, sometimes using public environmental, social and corporate governance ratings.

Starting with the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA), many of the restrictions of what type of funds could be rolled into an IRA and what type of plans IRA funds could be rolled into were significantly relaxed. Additional legislation since 2001 has further relaxed restrictions. Essentially, most retirement plans can be rolled into an IRA after meeting certain criteria, and most retirement plans can accept funds from an IRA. An example of an exception is a non-governmental 457 plan which cannot be rolled into anything but another non-governmental 457 plan.

The tax treatment of the above types of IRAs (except for Roth IRAs) are very similar, particularly for rules regarding distributions. SEP IRAs and SIMPLE IRAs also have additional rules similar to those for qualified plans governing how contributions can and must be made and what employees are qualified to participate.