How do annuities work? A complete beginner's guide
An annuity is a contract with an insurance company that turns a lump sum into either tax-deferred growth or guaranteed income. Here's exactly how each type works, in plain English.
An annuity is a contract with an insurance company: you pay a premium, and in exchange the insurer provides tax-deferred growth, future income, or both (the growth is guaranteed only in a fixed-rate annuity such as a MYGA). Strip away the jargon and every annuity is a variation on that one trade — money now for a guarantee later, with tax deferral in between. This guide walks through how each type works, what the guarantees actually cost, the tax rules, who an annuity fits, who should skip it, and the mistakes that trip people up.
The two phases every annuity moves through
Every annuity has up to two phases. The accumulation phase is where money grows tax-deferred — a MYGA at a fixed rate, an indexed annuity linked to a market index with a floor, or a variable annuity invested in sub-accounts. The payout phase is where the contract pays you, either as withdrawals or as annuitization, which converts the balance into a guaranteed income stream.
An immediate annuity skips accumulation entirely and goes straight to payout — you hand over a lump sum today and checks start within a year. A deferred annuity does the reverse: it grows for years or decades before you decide whether to turn it into income.
Illustrative projection, not a prediction or a quote: $100,000 at a constant 5% for 20 years, a 24% bracket throughout, no withdrawals, fees or rate changes (a real contract's rate is guaranteed only for its term). Both lines after tax. Deferral changes when you pay tax, not whether; the net advantage here is $14,814, smaller if your bracket rises and larger if it falls.
The five product families
Annuities come in five core shapes, and each solves a different problem. Knowing which one a salesperson is showing you is the single most useful filter you can apply.
- SPIA (single-premium immediate annuity) — immediate income for life, irrevocable, with no accumulation phase. It solves longevity risk: the fear of outliving your money.
- MYGA (multi-year guaranteed annuity) — a fixed yield for a set term, like a CD with tax deferral. It replaces CDs and Treasuries in taxable accounts.
- FIA (fixed-indexed annuity) — principal-protected with limited market-linked upside delivered through caps and participation rates. It fills the "want market upside without market downside" niche.
- RILA (registered index-linked annuity) — an SEC-registered security sold by prospectus. Growth is tied to an index, and a buffer or floor limits losses but does not remove them, so principal can decline. Don't confuse it with an FIA, which has a 0% floor.
- VA (variable annuity) — sub-accounts invest in market funds, principal can decline, and optional living-benefit riders add a floor. It suits high-bracket accumulators who have already maxed every other tax-advantaged account.
Where the guarantee comes from
An annuity is not FDIC-insured. Its guarantee rests on the issuing insurer's claims-paying ability, backed by state guaranty associations as a limited safety net (coverage limits vary by state; see NOLHGA). That is why carrier financial-strength ratings matter as much as the headline rate.
A 5.6% MYGA from a B-rated carrier is dramatically worse than a 5.3% MYGA from an A+ carrier once you price in the implicit credit-risk premium. Vet the carrier first (look for AM Best A- or better and confirm the state guaranty backstop), then compare rates among the survivors.
How money comes out — and how it is taxed
The tax treatment of an annuity hinges on two things: whether it is qualified (inside an IRA or 401(k)) or non-qualified (bought with after-tax money), and whether you take withdrawals or annuitize.
- Tax-deferred growth: you owe nothing until you withdraw. In a non-qualified contract only the gain is taxable, and gains come out first — "LIFO."
- Annuitization: each payment is part return-of-principal (tax-free) and part taxable gain, divided by an "exclusion ratio."
- Before 59½: gains withdrawn early generally incur a 10% IRS penalty on top of ordinary income tax.
The SEC's investor.gov and FINRA publish neutral primers worth reading alongside any sales material, and IRS Publication 575 covers the exclusion-ratio mechanics in detail.
The accumulation-payout split at a glance
| Phase | What happens | Tax treatment |
|---|---|---|
| Accumulation | Premium grows inside the contract | Tax-deferred |
| Annuitization (optional) | Cash value converts to lifetime payments | Exclusion ratio applies (non-qualified); ordinary income (qualified) |
| Surrender / withdrawal | You take cash; contract terminates or partial withdrawal | Gain first (LIFO), ordinary income |
| Death | Beneficiary receives cash value or remaining payments | Depends on contract and payout election |
A worked example: what a MYGA actually returns
Say you put $100,000 into a 5-year MYGA crediting a guaranteed 5.0% annually, compounded. Because the growth is tax-deferred, the full balance compounds without an annual tax drag.
- Year 1: $100,000 × 1.05 = $105,000
- Year 2: $105,000 × 1.05 = $110,250
- Year 3: $110,250 × 1.05 ≈ $115,763
- Year 4: $115,763 × 1.05 ≈ $121,551
- Year 5: $121,551 × 1.05 ≈ $127,628
After five years you have roughly $127,628, a $27,628 gain. In a non-qualified contract, none of that gain is taxed until you withdraw it. Compare that to a taxable account paying the same 5%: if you are in a 24% bracket, the annual tax on interest drags your effective rate to about 3.8%, and the same $100,000 grows to only about $120,500 — roughly $7,100 less before tax. But once you pay 24% on the MYGA's $27,628 gain at withdrawal, you keep about $121,000, only about $500 more than the taxable account. Over five years at the same tax rate, deferral is a modest edge; it grows the longer you hold.
The cost of the guarantee
You pay for certainty in three main ways. Surrender charges penalize early exit, often starting around 7–9% and declining to zero over the surrender period. Rider fees buy add-ons like guaranteed lifetime income or an enhanced death benefit. And on variable or indexed products, caps, spreads, and mortality-and-expense (M&E) charges shave your return.
None of these is inherently bad — they are the price of the guarantee, and they must be weighed against it. The problem is opacity. A plain MYGA or SPIA may have no explicit annual fee at all, while a fully loaded variable annuity can quietly cost 2%–3% per year once you add fund fees, M&E, and riders.
| Product | Typical explicit annual fee | Main hidden cost | Liquidity |
|---|---|---|---|
| SPIA | None | Irrevocable — you give up the lump sum | Very low |
| MYGA | None | Margin built into the rate | ~10%/yr penalty-free, then surrender charge |
| FIA | 0%–1% (rider-dependent) | Caps and participation rates limit upside | ~10%/yr penalty-free, then surrender charge |
| Variable | ~1%–3% all-in | M&E + fund fees + rider fees stack | ~10%/yr penalty-free, then surrender charge |
Who an annuity is right for — and who should skip it
An annuity is a tool, not a verdict. It earns its place for some savers and is dead weight for others.
Good fit
- You want guaranteed lifetime income you cannot outlive and are willing to trade liquidity for it (SPIA or DIA).
- You have maxed out 401(k)s and IRAs and want more tax-deferred space in a high bracket (low-cost VA or MYGA).
- You hold a large cash position and want a CD-like fixed rate with tax deferral (MYGA).
- You are anxious enough about market drops that you would otherwise sit in cash and lose to inflation (FIA).
Probably skip it
- You still have unused 401(k) or IRA room — fill those first; their tax break is cleaner and usually cheaper.
- You may need the money in the next few years — surrender charges punish early exits.
- You are being sold a complex, high-fee variable annuity inside an IRA, where the deferral is redundant.
- You value simplicity and full liquidity over a guarantee.
Common mistakes to avoid
- Chasing the highest rate. A slightly higher yield from a weak carrier is not a bargain; the guarantee is only as strong as the insurer.
- Ignoring the surrender schedule. Match the term to money you genuinely will not need; locking up cash you need in year two is expensive.
- Stacking riders you do not need. Each rider adds annual cost; buy only the guarantee that solves a real problem.
- Buying tax deferral you already have. Putting a deferred annuity inside an IRA pays for a benefit the IRA already provides.
- Skipping the free-look period. Most states give you 10–30 days to cancel a new contract for a refund — full premium on fixed contracts, usually the current account value on variable ones. Use it to read the actual contract, not the brochure.
How to do it: a sane buying process
- Define the job. Income for life, principal protection, or tax-deferred growth? The answer points to one product family.
- Vet the carrier. Confirm an AM Best rating of A- or better and check the NAIC for complaint history before you look at a single rate.
- Get the all-in cost in writing. Ask for every fee, cap, spread, and surrender charge on one page.
- Compare like with like. Same term, same payout option, same riders across carriers.
- Read the contract during the free-look window. If it does not match what you were told, walk away.
