"How much do I need to invest to get $2,000 a month? $5,000? $10,000?" Whatever the number in your head is, it's one of the most common questions asked about guaranteed income — and it's a genuinely hard one to answer honestly. Not because the math is complicated, but because your real answer depends on details that are yours alone: your age, the payout style you want, whether you're protecting anyone else with it. That's why so much of what you'll find online is a vague range instead of a real number.
This page is built to do better than that. Below, you'll find the tool that actually solves it — plug in the income you want, and it works backward to tell you what it costs. No vague range, no stranger's estimate. Just your number.
Diane asked herself a version of that question before she ever touched the tool. Her number was three thousand dollars a month — enough to cover the mortgage, the utilities, and still leave room to breathe. Yours might be higher, lower, or somewhere in between. Either way, let's walk through what actually moves the price, so the number you get back means something.
Diane had the number in her head before she ever looked at a rate table: three thousand dollars a month. Enough to cover the mortgage, the utilities, and still leave a little room to breathe. What she didn't have was the other half of the equation — how much it would actually cost to buy that number, guaranteed, for the rest of her life.
That's the question this article answers. But the honest answer isn't a single dollar figure — it's a range, and the range only narrows once a few specific variables are pinned down. Let's walk through what actually moves the price, then get you your own number instead of someone else's estimate.
Quick-Reference Ranges (Read the Caveat First)
Before the table: these numbers are illustrative, not a quote. They're built from generic, hypothetical payout assumptions — not any specific carrier's current rates — because actual pricing shifts with the rate environment and varies by company. Think of this as a ballpark to orient yourself, not a number to plan around.
| Target Monthly Income | Illustrative Lump-Sum Range* |
|---|---|
| $1,000/month | ~$150,000–$190,000 |
| $2,000/month | ~$300,000–$380,000 |
| $3,000/month | ~$450,000–$570,000 |
| $5,000/month | ~$750,000–$950,000 |
*Illustrative only — based on a hypothetical single-life annuitant in their late 60s to early 70s, life-only payout option, generic market rate assumptions. Not a quote. Individual pricing varies by age, gender, payout option, and current rates.
The Four Variables That Actually Move the Price
Diane's first instinct was to treat this like a CD calculation — plug in a rate, get an answer. But a SPIA isn't priced off a single interest rate. What actually determines a SPIA's payout rate is a mix of mortality credits, carrier expenses, and the rate environment — which is exactly why the range above is wide.
Age
The later you start, the higher the payout rate — and the smaller the lump sum needed for the same monthly income. A 75-year-old and a 65-year-old buying the same $3,000/month income will need meaningfully different premiums.
Gender
Where the product uses gender-distinct pricing, women's longer average life expectancy means a somewhat larger premium is needed for the same monthly payout.
Payout Option Chosen
Life-only income costs less to buy than the same income with a cash refund or period-certain guarantee attached, because the carrier is taking on less risk. This trade-off gets its own full breakdown in SPIA payout options compared and the income-vs-legacy trade-off — worth reading before you lock in a number.
The Rate Environment
SPIA pricing moves with prevailing rates at the time of purchase, the same way bond and CD pricing does. The same target income can cost noticeably more or less depending on when you buy.
Stop estimating with a generic table — solve it for your own numbers. The tool below runs the calculation the other direction: tell it the income you want, and it works backward to the lump sum.
Single Premium Immediate Annuity guide
Estimate SPIA income—and understand what every payout choice really costs
Solve for the income a lump sum may create or the premium needed for a desired income. Compare one-life and two-life options, beneficiary guarantees, possible tax treatment, and the trade-off between maximizing income and leaving a legacy.
What you will discover
- Estimated monthly income or required premium
- Single-life and joint-life survivor choices
- What cash refund, installment refund, and 10-year certain mean
- How much each beneficiary guarantee may cost
- What could happen after an early death
- How the IRS exclusion-ratio estimate differs from insurer pricing
Check the box before starting the calculator.
What should the calculator solve?
How will the annuity be funded, and what matters most?
Understand the four payout structures before seeing the numbers
Every beneficiary guarantee uses part of the contract’s pricing capacity. That generally means less income—or more required premium—for the annuitant.
Straight life
Income continues for as long as the annuitant lives. Payments stop at death.
Life with cash refund
If all covered lives die before payments equal the premium, the remaining difference is generally paid to the beneficiary in one lump sum.
Life with installment refund
If all covered lives die before the premium has been returned, installments generally continue until the remaining premium is paid.
Life with 10-year period certain
Income lasts for life. If all covered lives die during the first 10 years, the remaining scheduled payments in that period continue to the beneficiary.
“10-year certain with life” does not mean payments stop after 10 years
If the covered annuitant or annuitants live 27 years, income continues for 27 years. The 10-year guarantee matters only if all covered lives die during the first 10 years.
Joint reduced-survivor convention used by this estimator: the full initial payment is guaranteed through the 10-year period. A 75% or 50% survivor reduction begins after the later of the first death or the end of the guaranteed period.
Refund-option limitation: reduced-survivor joint cash and installment refund mechanics vary by insurer and contract. The results will show “Carrier quote required” rather than inventing a precise value.
Confirm what you are exchanging for guaranteed income
A SPIA is generally an irrevocable exchange
You are generally giving up control of the lump sum in return for a contractual income stream. After the applicable free-look period:
- The premium ordinarily cannot be withdrawn.
- The income option ordinarily cannot be changed.
- Fixed payments may lose purchasing power over time.
- Beneficiary payments depend on the option selected.
SPIA planning estimates
An estimate is only the starting point
Decision Tree Insurance is an independent insurance broker. We represent our clients—not one annuity company—and compare available SPIA income offers from highly rated insurers licensed in your state. Actual insurer quotes use your exact date of birth, premium, state, and selected payout structure.
Payout percentage is not an interest rate
The annual payment as a percentage of premium includes return of premium, insurer interest, and mortality credits. It is not an investment return.
Why straight life or joint life generally pays more
It directs the greatest portion of the premium toward lifetime income instead of reserving part of the pricing for payments after death.
Explore the details
What happens if death occurs early?
Estimated federal tax treatment
Income versus legacy strategy
Cost of beneficiary guarantees
Cumulative income and purchasing power
Medically underwritten annuities
Estimator assumptions and limitations
- Level monthly income beginning approximately one month after purchase.
- Pricing mortality uses the Society of Actuaries 2012 Individual Annuity Mortality basic tables with a simplified mortality-improvement adjustment.
- The estimator first attempts a same-domain WordPress rate endpoint, then the U.S. Treasury XML feed, then saved or fixed fallback data.
- The planning range is a model band—not insurer-specific quotes.
- Actual insurers use different assets, expenses, mortality assumptions, reserves, profit targets, and business objectives.
- Single-life after-tax estimates use IRS Publication 939 Table V and, where applicable, a Table VII refund-feature adjustment. Joint-life tax estimates use Tables VI and VIA for the basic lifetime option; joint refund-feature taxation is not estimated because the IRS calculation is contract-specific.
- Carrier tax reporting and advice from a qualified tax professional control.
- Guarantees depend on the claims-paying ability of the issuing insurer.
Tax source: IRS Publication 939. Rate source: U.S. Treasury daily interest-rate feed.
A Worked Example
Diane ran her number through the estimator: $3,000 a month, starting at 68, life-only. The tool gave her a real figure — and then she toggled to a cash refund option to see her heirs protected too. The lump sum jumped. Nothing wrong happened; she just saw, in dollars, exactly what the earlier section described in concept: the guarantee she was buying for her kids had a price tag, separate from the income guarantee she was buying for herself.
That's the value of running your own numbers instead of reading a table. The table tells you the shape of the answer. The tool tells you yours.
Size the Number to What You Actually Need — Not the Whole Number
Here's where Diane's first instinct needed a second look. Her gut said "replace my whole income." But her whole income wasn't all essential — some of it was travel, gifts, the occasional splurge. Those wants don't need a guarantee behind them. Her mortgage, utilities, and groceries do.
This is the barbell at work: put the guarantee under what you can't afford to lose, and let the rest of the portfolio carry the flexibility and upside. Sizing the SPIA to your essential-expense floor — not your entire lifestyle — usually means a smaller, more affordable premium than the "replace it all" instinct suggests. How much of your essential expenses guaranteed income should cover walks through exactly how to draw that line.
What This Number Doesn't Tell You
One honest caveat: everything above is the gross premium-to-income math. It doesn't tell you what you'll actually keep after taxes. A portion of every SPIA payment is treated as a return of your own principal and isn't taxed at all — the rest is. How much of each is determined by IRS rules, not guesswork, and it changes the real cost-benefit picture. How a SPIA is taxed: the exclusion ratio explained covers exactly how that split is calculated.
Frequently Asked Questions
Is this tool just there to collect my information so you can call me all the time?
No! As with all the tools on this site, this tool is free to use and it doesn't require your contract information to get your results. If you want to take the next step and talk to one of our agents, we will be happy to help but we will not pressure you into buying something you don't want.
Is there a minimum amount to invest in a SPIA?
Minimums vary by carrier, but most SPIAs start well below the premiums shown in the table above. There's no universal floor — it comes down to the specific contract.
Does my age change how much I need to invest?
Yes, significantly. Starting later generally means a higher payout rate, which lowers the lump sum needed for the same monthly income.
What if interest rates change after I buy?
Once a SPIA is purchased, your payout rate is locked in for the life of the contract — rate changes afterward don't affect your income, up or down.
Can I fund a SPIA with money from my IRA?
Yes, and the tax treatment is different than funding one with after-tax savings. SPIA funded by an IRA vs. after-tax savings covers how that changes the picture.
Where to Go From Here
Run your own numbers with the SPIA Income Estimator, then size your target against your real essential expenses in how much guaranteed income should cover. If you want the full picture on what's driving the rate you're seeing, what determines a SPIA's payout rate is the next stop.
Questions about your specific numbers? Reach out here — or read more about Kevin's approach on his author page.