---
title: "What Is an Annuity, and How Does It Work?"
description: "An annuity is a contract with an insurer that turns a lump sum into a stream of income — often guaranteed for life. The promise is not outliving your savings. The trade-offs are cost, complexity and locked-up money."
category: "Personal Finance"
category_url: https://boursel.com/category/personal-finance
author: "Priya Venkatesan"
published: 2026-06-26T20:36:00.000Z
updated: 2026-06-26T20:36:00.000Z
canonical: https://boursel.com/article/what-is-an-annuity-and-how-does-it-work
tags: ["annuities", "retirement", "income", "insurance", "personal-finance"]
---
# What Is an Annuity, and How Does It Work?

An annuity is a contract with an insurer that turns a lump sum into a stream of income — often guaranteed for life. The promise is not outliving your savings. The trade-offs are cost, complexity and locked-up money.

*This is general information, not financial advice. Annuity suitability depends on your situation — consult a fee-only fiduciary.*

For retirees who fear outliving their money, an annuity offers a tempting promise: a check that never stops. The fine print is where it gets complicated.

## The basic idea

An **annuity** is a contract with an insurance company. You hand over a lump sum (or a series of payments), and the insurer pays you income — now or later, often **for life**, [per the SEC's Investor.gov](https://www.investor.gov/introduction-investing/investing-basics/investment-products/insurance-products/annuities). The appeal is protection against **longevity risk** — outliving your savings. For someone without a pension, it can layer guaranteed income on top of Social Security.

## When income starts: immediate vs. deferred

**Immediate annuities** (often **SPIAs** — single-premium immediate annuities) start paying within about a month of your deposit; they're the simplest, most transparent type. **Deferred annuities** are bought years ahead, growing tax-deferred during an **accumulation phase** before you turn on income (a step called **annuitization**).

## How it grows: fixed, variable, indexed

- **Fixed:** a guaranteed rate and a set payment — predictable, but vulnerable to inflation, [FINRA notes](https://www.finra.org/investors/learn-to-invest/types-investments/annuities).
- **Variable:** payments depend on investment subaccounts — more upside, full downside, and **heavy fees** (a mortality-and-expense charge around 1.25%/yr, plus fund and rider costs, often totaling 2–3%+ a year).
- **Indexed (FIA):** returns track a market index like the S&P 500 with a **floor** (won't go below zero) and a **cap** (you get only part of a big up year).

## Why people buy them

Guaranteed lifetime income to supplement Social Security; tax-deferred growth with no contribution limits; longevity protection (the insurer bears the risk you live long); and optional **riders** (e.g. a guaranteed lifetime withdrawal benefit) that add income guarantees — at extra cost.

## The serious drawbacks

- **Fees.** Variable and indexed annuities are expensive; layered charges erode returns versus low-cost index funds.
- **Surrender charges.** Deferred annuities typically **lock your money for 7–10 years**, with early-withdrawal penalties starting around 7–9%.
- **Complexity and hard selling.** They're among the most aggressively commissioned products; ask exactly how a seller is paid.
- **Inflation.** A fixed payment loses purchasing power; most contracts have no cost-of-living adjustment.
- **Liquidity.** Once annuitized, the income stream generally can't be reversed.
- **Solvency.** Annuities are **not FDIC-insured** — they're backed by the insurer, with **state guaranty associations** as a backstop (a floor of $250,000 in present value per person under the NAIC model act; some states set $300,000–$500,000). Check your state's limit.

## Taxes

Money grows **tax-deferred**; withdrawals of gains are taxed as **ordinary income** (not the lower capital-gains rate), and taking money before age 59½ adds a **10% IRS penalty**. Note: putting a deferred annuity *inside* an IRA adds no tax benefit — the account is already tax-deferred.

## Is the guarantee worth the cost?

That's the central debate. Many fee-only advisers argue most people with a long horizon do better with low-cost index funds than with a fee-laden annuity. The counterpoint: no fund guarantees a monthly check for life. For someone with modest savings, no pension and real anxiety about longevity, a simple **immediate fixed annuity (SPIA)** can buy genuine peace of mind at relatively low cost.

The right question isn't whether annuities are "good" or "bad," but whether the guarantee is worth its price **in your situation** — weighing your other guaranteed income, assets, health and risk tolerance. Because the products are complex and often commission-driven, a **fee-only fiduciary** planner (one who doesn't earn product commissions) can model the trade-offs without a conflict of interest. This is an explainer, not a recommendation.

## Sources

- [Annuities — Investor.gov](https://www.investor.gov/introduction-investing/investing-basics/investment-products/insurance-products/annuities)
- [Annuities — investor education](https://www.finra.org/investors/learn-to-invest/types-investments/annuities)