How Much of Your Portfolio Belongs in an Annuity?

"How much should I put in an annuity?" is usually asked as a percentage question, and that's the wrong shape for it. An annuity is not an asset class you weight — it's a paycheck you size. The right amount depends on the bills your other income doesn't cover, not on what someone else with the same portfolio did. This guide walks through the income-gap method — the way planners actually size guaranteed income — and the guardrails that keep the answer from going wrong in either direction. The worksheet below runs the whole method live.

Start With the Job, Not the Percentage

An income annuity has one job: turning savings into payments that arrive for life, no matter what markets do. That job has a natural size — the gap between what you must spend and what already arrives guaranteed. Buy less than the gap and part of your rent rides on market returns; buy much more and you've traded away liquidity you didn't need to. So the question isn't "what percent?" It's "how big is my gap, and what does filling it cost?" The percentage falls out at the end.

The Income-Gap Method, Step by Step

1. Total your essential monthly expenses. Housing, food, utilities, insurance, healthcare, transportation — the bills that arrive whether or not the market cooperates. Leave out travel and wants; those flex.
2. Total your guaranteed monthly income. Social Security at the age you actually plan to claim, plus any pension. Weighing a pension buyout? Settle that first — our pension lump sum vs annuity guide covers it — it changes this line directly.
3. Subtract. Essentials minus guaranteed income is your gap. Zero or negative means your floor is already built — an annuity is a preference, not a need.
4. Price the gap. Use the annuity payout comparison tool and live SPIA income estimates to see what premium produces your gap amount at your age — pricing moves with rates, so use live numbers.
5. Sanity-check the result as a percentage. Premium ÷ portfolio is your allocation. Now — and only now — is the percentage useful, as a stress test against the guardrails below rather than a target.

Why Percentage Rules Fail

Picture two retirees with identical portfolios. One has a pension that, with Social Security, covers every essential bill; her gap is zero, and the right allocation is probably nothing. The other has Social Security alone and a mortgage that runs another decade; his gap is real, and a meaningful allocation may be exactly right. Any percentage rule gives those two the same answer. The income-gap method gives them different answers because they have different problems — which is the point. Try the "floor covered" and "big gap" presets above to watch the same portfolio produce opposite conclusions.

The Guardrails

The gap sets the target; these constraints set the ceiling.

• Liquidity first. Keep an emergency reserve and known big-ticket expenses entirely outside. Deferred contracts carry surrender charges for early exits — our early withdrawal penalty guide covers the cost — and annuitized money generally can't leave at all.
• Mind the age-59½ line. Earnings withdrawn before 59½ generally face a 10% IRS additional tax on top of ordinary income tax. Money you might need before then doesn't belong in the contract.
• Keep growth assets for inflation. A level payment buys less every year; the portfolio outside the annuity defends your purchasing power over a multi-decade retirement.
• Match the payout to legacy goals. Life-only payouts leave nothing at death; refund and period-certain options from the payout options menu protect heirs at the cost of a smaller check. Money earmarked for children may belong outside entirely.
• Ladder instead of lump. Splitting the purchase across years avoids locking everything at one day's pricing — and the timing question has its own tradeoffs worth reading first.

Buying a MYGA? That's a Different Question

Everything above sizes an income annuity. A multi-year guaranteed annuity is an accumulation product — a fixed-rate contract competing with CDs and bonds, not with your paycheck. Sizing one is a fixed-income allocation decision: it draws from the bond side of your portfolio, and the practical limit is how much you can commit for the full term without touching it. For that decision, compare current MYGA rates against what you'd earn elsewhere — our MYGA vs CD comparison and annuity vs bond breakdown cover the tradeoffs.

Quick Signals: Smaller or Larger

That last row deserves a full read: delaying Social Security permanently raises your guaranteed income, and a bridge annuity can fund the delay — sometimes shrinking the lifetime gap enough to change how much annuity you need.

Pressure-Test the Number Before You Commit

Treat the premium as a hypothesis. Quote it across carriers rather than accepting the first proposal — our guide to comparing annuity quotes shows what to line up — and weigh the honest downsides in our annuity pros and cons breakdown. If an agent has handed you a specific proposal, an independent annuity second opinion can check the product and the sizing before anything is signed.

The right amount makes your essential expenses boring — covered by income that shows up regardless — while leaving the rest of your money free to grow, flex, and pass on. Work the gap, respect the guardrails, and the percentage takes care of itself.