This document discusses several types of retirement accounts that can be used to save and invest for retirement including 401(k) plans, Solo 401(k) plans, SEP IRAs, traditional and Roth IRAs, health savings accounts (HSAs), Coverdell education savings accounts (ESAs), and inherited IRAs. Each type of account has different contribution limits and rules around withdrawals and required minimum distributions. Solo 401(k) plans allow individuals to make both employee and employer contributions, up to a total of $57,000 or $62,000 if over age 50. SEP IRAs are employer-sponsored plans with contribution limits of 25% of compensation or $57,000. HSAs can be used to pay