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 Contribution Amounts (2022):  TSP allows $20,500 annual contributions while IRAs only allow $6,000.  Furthermore, TSP allows an additional ‘catch-up’ contribution of $6,500 starting the year you