What an annuity actually does
Turn a lump sum into income.
At its core, an annuity is a contract where you give an insurer money and they pay you back over time — often for life. The appeal is a guaranteed paycheck you can't outlive. The tradeoff is you give up access to the lump sum and you pay for the guarantee.
Watch for: surrender charges. Most annuities lock your money up for years and charge you to get out early. Know the surrender schedule before you sign.
The main types, plainly
Immediate, deferred, fixed, indexed, variable.
Immediate starts paying you now. Deferred pays later. Fixed guarantees a rate. Indexed ties returns to a market index with a cap. Variable invests in sub-accounts (more risk, more fees). Simpler is usually cheaper.
Watch for: fees. Variable and indexed annuities can stack multiple fees that quietly eat your returns. Ask for the total annual cost in dollars.
Do you actually need one?
The honest test.
An annuity makes sense when you've maxed other tax-advantaged accounts, you're worried about outliving your money, and you value a guaranteed floor over growth. If you want growth and flexibility, an annuity is usually the wrong tool — you're paying for a guarantee you don't need.
Watch for: 'tax-deferred growth' used as the main selling point. You already have tax deferral in an IRA or 401(k). An annuity's real value is the lifetime income guarantee — weigh whether you need that.