Chapter 1 - Contributions Other types of IRA contributions such as rollover contributions and contributions under a Simplified Employee Pension (SEP) or Savings Incentive Match Plan for Employees (SIMPLE), are discussed in other chapters. Note: All IRA deposits are subject to collection (e.g., if an IRA contribution check is returned for insufficient funds, no contribution has occurred). Traditional and Roth IRAs IRA owners can contribute to a Traditional IRA, or a Roth IRA, or both. The chart on the next page illustrates the primary differences between the two IRAs. IRA Digital Reference Manual © PMC