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The simplest way to think about an annuity: it's a contract where you hand an insurance company a lump sum, and they take on two guarantees — that they'll grow your money under defined terms, and that they'll pay it back to you in a structured way, including for the rest of your life if that's what you choose. No other financial product makes both of those promises simultaneously.
The mechanics behind that promise are worth understanding before you sign anything. How the money grows, what triggers income payments, what happens if you need access early, and how the tax treatment works — these details determine whether an annuity fits your situation or doesn't. What follows is a plain-language explanation of exactly how annuities work, without the sales language.
Key Takeaways
- Annuities have two phases: accumulation (growth) and distribution (income) — understanding both is non-negotiable before purchasing
- Fixed annuities guarantee a set rate; indexed annuities link credits to a market index with a floor; variable annuities invest directly in market subaccounts with no floor
- Growth inside an annuity is tax-deferred — no annual tax on interest or gains until withdrawal
- Most contracts allow 10% annual free withdrawals; full early withdrawal triggers surrender charges and a potential 10% IRS penalty before age 59½
- A SPIA converts a lump sum to immediate lifetime income — once annuitized, the decision is typically irreversible
- Annuities are the only financial product besides a pension that can guarantee income you cannot outlive
The Two Phases: Accumulation and Distribution
Every annuity operates in two sequential phases. How long each phase lasts — and whether there's a gap between them — depends on the product type.
The Accumulation Phase
During accumulation, your premium grows inside the contract under the terms you've agreed to. For a fixed annuity, that means a guaranteed interest rate. For a fixed indexed annuity, it means interest credited based on how a market index performs, subject to caps and a 0% floor. For a variable annuity, it means direct participation in investment subaccounts with no floor against loss.
The defining feature of accumulation across all annuity types: growth is tax-deferred. You pay no tax on interest or gains while the money compounds inside the contract. That deferred compounding is one of the core reasons annuities exist as a product category.
The Distribution Phase
Distribution begins when you start taking income from the contract. This happens in one of two ways.
Annuitization converts your accumulated value into a guaranteed stream of payments — monthly, quarterly, or annually — for a defined period or for life. Once annuitized on a lifetime option, you typically cannot reverse the decision or take a lump sum. The carrier assumes the longevity risk from that point forward.
Systematic withdrawals let you take money out of the contract without fully annuitizing — preserving the remaining account value for heirs or future use, but without the ironclad lifetime income guarantee that annuitization provides.
Understanding which distribution method fits your goals before you purchase is as important as understanding how the accumulation phase works.
How Each Annuity Type Works
The accumulation mechanics differ significantly by product type. Here's how each one actually functions.
Fixed Annuities and MYGAs
A fixed annuity credits a guaranteed interest rate set at contract issue. The most common structure is the Multi-Year Guaranteed Annuity — a MYGA — which locks the rate for the full term with no annual reset. A 5-year MYGA at 6.30% credits 6.30% every year for five years, regardless of market conditions.
The insurance company invests your premium in investment-grade bonds and uses the spread between their portfolio yield and your credited rate to cover costs and profit. You bear no investment risk — the carrier does. In exchange, your upside is capped at the contractually guaranteed rate.
Top fixed annuity rates in April 2026 range from 4.00% on 1-year terms to 6.30% on 5- and 7-year terms. For current rate comparisons by term, our MYGA rates page has the full carrier breakdown.
Fixed Indexed Annuities
A fixed indexed annuity credits interest based on how a market index — most commonly the S&P 500 — performs during a crediting period, typically one year. The floor is 0%: if the index drops 30%, you credit 0%, not negative. The ceiling is determined by a cap rate, participation rate, or spread that limits how much of the index gain you receive.
The insurance company funds the floor using the same bond-based structure as a fixed annuity, then uses a portion of the bond yield to purchase index options — which is what gives you participation in index gains. You are not invested in the stock market. You are earning interest that is calculated based on how the index performs.
Credited interest locks in permanently at each anniversary and cannot be taken back by future market downturns. That ratchet mechanic — gains lock, losses don't apply — is the defining feature of the FIA structure.
Variable Annuities
A variable annuity invests your premium directly in mutual fund-like subaccounts. Your account value rises and falls with the performance of those underlying investments. There is no floor — in a severe market downturn, your account value can drop significantly.
Variable annuities offer optional riders that can layer guaranteed income or death benefit floors onto the variable structure, but those riders carry annual costs that reduce the net return. Variable annuities have the highest fee structures of any annuity type — typically 1.5%–3.5% annually when all layers are included.
For most clients comparing annuity options, the tradeoff between a fixed indexed annuity's floor-and-cap structure and a variable annuity's unlimited upside with full downside is the central product decision.
Immediate Annuities (SPIAs)
A single premium immediate annuity skips the accumulation phase entirely. You deposit a lump sum and income payments begin within 30 days to one year. The carrier calculates your payment based on your age, gender, premium amount, payout option selected, and current interest rates.
SPIAs are the purest expression of longevity insurance: you are converting an asset into a guaranteed income stream that cannot be outlived. The tradeoff is that the premium is typically irrevocable — you exchange the lump sum for the income stream, and the principal no longer exists as an accessible asset.
In our April 2026 survey, a 65-year-old male placing $250,000 into a 5-year period certain SPIA received up to $1,658.72 per month from the top carrier. For current payout figures, the SPIA rates page has the full breakdown by premium, term, and carrier.
| Type | How Growth Works | Floor | Upside | Best For |
|---|---|---|---|---|
| Fixed / MYGA | Guaranteed rate locked at issue | Principal guaranteed | Rate-limited | Predictable growth, CD alternative |
| Fixed Indexed | Index-linked credits with cap | 0% floor | Cap or participation rate limited | Growth potential with downside protection |
| Variable | Direct subaccount investment | None | Unlimited | Market participation, higher risk tolerance |
| SPIA | No accumulation — immediate income | N/A | N/A | Lifetime income now |
How Annuity Fees Work
Fee structures vary significantly by product type and are the primary differentiator between annuity types in terms of total cost.
Fixed annuities and MYGAs typically carry no annual fees on the base product. The carrier's profit is built into the spread between their portfolio yield and your credited rate — there is no explicit fee line item.
Fixed indexed annuities also carry no annual fee on the base product in most cases. Optional income riders add 0.95%–1.25% annually, charged against the benefit base or account value depending on the contract.
Variable annuities carry mortality and expense charges typically running 1.0%–1.5% annually, plus investment management fees on each subaccount (0.5%–2.0%), plus any rider costs. Total all-in costs on a variable annuity with income rider can reach 3.0%–3.5% annually — a meaningful drag on net returns.
All annuity types impose surrender charges for full early withdrawal — typically 7–10% in year one, stepping down to zero over the surrender period. Most contracts include a 10% annual free withdrawal provision that allows access to a portion of the contract without triggering surrender charges.
How Annuity Taxation Works
Tax treatment is one of the most important and most misunderstood aspects of how annuities work.
During accumulation, growth is tax-deferred. No annual tax on interest, index credits, or subaccount gains. The compounding effect of deferring taxes — especially for clients in the 22%–32% federal brackets — meaningfully increases effective returns versus a taxable account earning the same nominal rate.
At withdrawal, taxation depends on whether the annuity is qualified or non-qualified.
Qualified annuities are funded with pre-tax dollars — 401(k) rollovers, IRA transfers. Every dollar withdrawn is taxable as ordinary income because none of it has been taxed yet.
Non-qualified annuities are funded with after-tax dollars. On withdrawal, only the gain portion is taxable. Your original principal comes out tax-free. Annuitized payments use the exclusion ratio to split each payment between taxable gain and tax-free return of principal.
Withdrawals before age 59½ trigger a 10% IRS penalty on the taxable portion — the same rule that applies to early 401(k) distributions. This applies regardless of annuity type or whether the withdrawal is within the free withdrawal provision.
Expert Tip: The decision most people make too late
The annuitization decision is the one I see people rush through after spending months comparing accumulation products. Once you annuitize on a life-only option, that's permanent — the lump sum is gone and you own a monthly check. I spend as much time explaining payout options as I do explaining the product itself, because the structure you choose at income activation determines the outcome more than any accumulation feature.
—Brad Cummins, Insurance Geek Founder
Payout Options: How Annuity Income Works
When you reach the distribution phase, your payout option determines how payments are structured and what happens if you die before receiving your full value.
Life only pays the highest monthly amount but stops at death — nothing passes to heirs regardless of how long the carrier has been paying.
Life with period certain guarantees payments for the longer of your lifetime or a defined period — commonly 10 or 20 years. If you die in year three of a 20-year period certain, your beneficiary receives payments for the remaining 17 years.
Joint and survivor continues payments as long as either you or your spouse is alive. The monthly payment is lower than life-only to account for the longer expected payout period.
Period certain only pays for a defined number of years regardless of whether you are alive. Higher monthly payments than lifetime options but no longevity protection beyond the period.
The right payout option depends on your health, your spouse's situation, your other income sources, and how important legacy protection is relative to maximizing monthly income.
How Annuities Handle Death Benefits
During the accumulation phase, most annuities pay the account value or a contractually defined minimum death benefit to named beneficiaries — bypassing probate entirely. This is a meaningful estate planning advantage over bank products that become part of the estate.
After annuitization, what passes to beneficiaries depends entirely on the payout option you selected. Life-only pays nothing at death. Period certain continues payments through the guarantee period. Joint and survivor continues for the surviving spouse.
Naming beneficiaries correctly — and updating them after life changes — is as important as the product selection itself.
Pros
- Only financial product besides a pension that can guarantee income for life
- Tax-deferred growth with no annual tax drag during accumulation
- No contribution limits — useful beyond maxed 401k and IRA
- Principal protection on fixed and indexed products regardless of market conditions
- Death benefit passes directly to beneficiaries, bypassing probate
Cons
- Surrender charges limit full liquidity for 5–10 years on most products
- Withdrawals before 59½ trigger 10% IRS penalty on taxable portion
- Variable annuities can lose principal — no floor without optional riders
- Annuitization on life-only option is typically irreversible
- Fee structures on variable annuities can significantly reduce net returns
Who Annuities Work Best For
Annuities fit specific situations well and fit poorly outside of them.
The clearest fits: pre-retirees who want a guaranteed income floor that covers essential expenses regardless of what the market does, high-income earners who have maxed other tax-advantaged accounts and want additional tax-deferred accumulation, clients who are specifically concerned about outliving their assets and want longevity insurance, and anyone comparing fixed annuity rates to CD rates who has done the after-tax math correctly.
Who Annuities Are NOT For
Clients who need full liquidity within the surrender period. Clients under 59½ who may need access — the IRS penalty changes the calculation significantly. Clients whose primary goal is maximum market participation without caps. Anyone who hasn't first maximized employer 401(k) matching — that's a guaranteed return that no annuity can match.
For a comparison of the types of annuities side by side, or to see how specific products compare, the best fixed indexed annuity companies and best MYGA companies pages cover current carrier options in detail.
FAQ
About Brad Cummins
Brad Cummins is the founder of Insurance Geek and primary author of its educational content. Licensed since 2004, he brings over 21 years of experience structuring life insurance and IUL strategies for clients nationwide.
Fact checked by Ryan Wood
Ryan Wood is a licensed insurance professional and contributing advisor at Insurance Geek, serving as a fact checker and technical reviewer for life insurance and annuity content. First licensed in 2013, he brings more than 12 years of experience and holds licenses in over 40 U.S. states.
