The Power of Tax-Deferred Growth Why are 401(k) plans, annuities, and IRAs so popular? Share | Related Content Rightsizing for Retirement What does your home really cost? What Is an Annuity? Annuities are versatile tools that can help you save for retirement and generate income in retirement. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.