14 Differences between TSP & IRA TSP vs. IRA: Both are retirement accounts, both offer a Roth and a Traditional option, yet there are many important differences. Here are 14 differences 1. Contribution Amounts (2024):  TSP allows $23,000 annual contributions while IRAs only allow $7,000.  Furthermore, TSP allows an additional ‘catch-up’ contribution of $7,500 starting