Sigma Calculator — 543+ Free Calculator Tools
Grow a lump sum during deferral, then see the level annual payout and monthly equivalent at annuitization.
Using the Deferred Fixed Annuity Calculator takes under a minute: you enter four numbers and it shows both what your lump sum will grow into and the guaranteed income that growth can buy. Start with the lump sum premium — the single amount you hand to the insurer today, whether it comes from savings, a bonus, or a rollover. Next, enter the guaranteed annual interest rate from the annuity contract; this is the fixed rate the insurer credits during deferral, not a market projection. Then enter the deferral period in years — how long the money compounds before payouts begin — and the payout period in years, the length of time you want guaranteed income to last. Hit calculate and the tool reports the value at annuitization (your lump sum grown with compound interest), the equivalent level annual payout, the monthly equivalent, the total paid out over the payout period, and the growth earned during deferral. Because the rate is guaranteed, every figure is contractual rather than estimated, which is precisely the appeal of the product.
Three checks keep the results meaningful. First, use the contract's guaranteed rate, not the higher "current" or teaser rate insurers sometimes advertise for year one — illustrations built on non-guaranteed rates can flatter the outcome. Second, make the deferral and payout periods reflect real plans: deferring from age 55 to 70 is fifteen years, and a payout period should be weighed against life expectancy, not picked arbitrarily. Third, compare the total paid out with the original premium to see the full picture — in our default example, $100,000 becomes $261,413.44 of total payouts, but spread over thirty years, so always think in both nominal and inflation-adjusted terms. A smart use of the calculator is sensitivity testing: nudge the rate from 4% to 5% or stretch deferral from ten to fifteen years and watch the annual payout move. That single comparison often convinces savers that starting five years earlier matters more than chasing an extra half-point of yield.
A deferred fixed annuity is an insurance contract with two distinct lives. During the deferral period (also called the accumulation phase), your lump sum — the accumulation value — grows at a guaranteed fixed interest rate, with taxes deferred until you withdraw. Nothing is paid out; the money simply compounds. Then comes annuitization: the accumulated value is converted into a stream of guaranteed payments over the payout phase, which can last a fixed number of years or, in life-contingent contracts, for as long as you live. The "fixed" in the name means both the crediting rate and the payout amounts are contractually set — they do not rise or fall with markets, which distinguishes these contracts from variable and indexed annuities.
The magic ingredient most savers underestimate is time. Because growth compounds, each extra year of deferral does double duty: it lengthens the compounding runway and shortens the remaining payout window the insurer must fund, both of which push the annual payout higher. A 45-year-old deferring to 65 gets twenty years of compounding; waiting until 70 adds five more years of growth on an already-large base. Insurers can offer these guarantees because they pool thousands of contract holders and invest conservatively, keeping a spread between what their bond portfolios earn and what they credit — the difference funds their costs, profit, and the guaranteed rate promise. For the buyer, the product is essentially longevity insurance: a private pension that cannot be outlived (in life-contingent versions) or that delivers a known income bridge (in period-certain versions).
Deferred fixed annuities occupy a specific niche in retirement planning. They suit savers who have maxed out 401(k)s and IRAs and want more tax-deferred growth, pre-retirees who want to lock in a future income floor, and conservative investors who would rather accept a modest guaranteed rate than ride market volatility near retirement. They are not for everyone: the money is illiquid during the surrender-charge period, fixed payouts lose purchasing power to inflation, and fees or riders can drag the effective return below the headline rate. Used deliberately — as the safe-income layer beneath market-based investments — a deferred fixed annuity turns an uncertain retirement horizon into a contract with numbers you can plan around.
The calculation has two stages. First, compound the premium through deferral:
FV = P × (1 + r)^t
where P is the lump sum, r the annual rate, and t the deferral years. Second, convert that future value into a level annual payout over n payout years — the standard annuity-immediate formula:
Annual payout = FV × r ÷ (1 − (1 + r)^−n)
The monthly equivalent is simply the annual payout divided by twelve, and the total paid out is the annual payout times n.
Worked example 1. A $100,000 premium at a guaranteed 5%, deferred 10 years, then paid over 20 years. Stage one: FV = $100,000 × 1.05^10 = $100,000 × 1.6288946 = $162,889.46. Stage two: annual payout = $162,889.46 × 0.05 ÷ (1 − 1.05^−20). Since 1.05^−20 = 0.3768895, the divisor is 0.6231105, giving $8,144.47 ÷ 0.6231105 = $13,070.67 per year. Monthly: $13,070.67 ÷ 12 = $1,089.22. Total paid out: $13,070.67 × 20 = $261,413.40. Growth during deferral was $62,889.46; the remaining $98,523.94 of total payouts represents interest credited during the payout phase.
Worked example 2. A $50,000 premium at 4%, deferred 15 years, paid over 25 years. Stage one: FV = $50,000 × 1.04^15 = $50,000 × 1.8009435 = $90,047.18. Stage two: 1.04^−25 = 0.3751168, so the payout factor is 0.04 ÷ 0.6248832 = 0.0640116, giving $90,047.18 × 0.0640116 = $5,763.96 per year. Monthly: $480.33. Total paid: $5,763.96 × 25 = $144,099.00. Notice the leverage of deferral here: fifteen years of compounding turned $50,000 into $90,047.18 before a single payout was made, and the long 25-year payout window still delivers nearly triple the original premium in total.
Elena, 50, sells a rental property and puts $200,000 into a deferred fixed annuity crediting 4.5%, planning to annuitize at 65 and take payouts for 25 years. Deferral math: FV = $200,000 × 1.045^15 = $200,000 × 1.9352824 = $387,056.48 at age 65 — nearly double her premium from compounding alone. Annuitization: with 1.045^−25 = 0.3327306, the annual payout is $387,056.48 × 0.045 ÷ 0.6672694 = $17,417.54 ÷ 0.6672694 = $26,102.87 per year, or $2,175.24 per month. Over 25 years she collects $26,102.87 × 25 = $652,571.75 — more than triple her original $200,000.
Why Elena chose this structure matters. Her 401(k) stays invested for growth; the annuity becomes the guaranteed floor covering housing costs and insurance no matter what markets do. She deliberately picked a 25-year period-certain payout (to age 90) rather than a life annuity because she wants any remaining value to pass to her children if she dies early — a trade-off worth understanding, since life-contingent payouts would be higher per year. She also confirmed the contract's free-withdrawal provision (10% annually after year one) so an emergency cannot lock her out completely. The calculator let her test the pivotal choice — annuitize at 65 versus 70 — in seconds: five more years of deferral would have pushed the monthly payout substantially higher, a quantified reward for patience she could weigh against retiring earlier.
David, 58, owns a profitable bakery and wants guaranteed income bridging the gap between selling the business at 68 and claiming maximum Social Security at 70 — but he also wants income well beyond. He places $150,000 at a guaranteed 6%, defers 10 years, and elects a 15-year payout. FV = $150,000 × 1.06^10 = $150,000 × 1.7908477 = $268,627.16 at annuitization. With 1.06^−15 = 0.4172651, the annual payout is $268,627.16 × 0.06 ÷ 0.5827349 = $16,117.63 ÷ 0.5827349 = $27,659.78 per year — $2,304.98 per month — totaling $27,659.78 × 15 = $414,896.70.
David's case shows the product's flexibility as a planning tool rather than a lifetime commitment. The 15-year period-certain payout delivers $414,896.70 against a $150,000 premium, a 2.77× multiple, funding his late-60s and 70s while Social Security maximization and business-sale proceeds cover the rest. Critically, he ran the numbers before signing: at 6% guaranteed the deal beat the 4.2% his bond ladder was yielding, and the tax deferral during the ten accumulation years — no annual tax drag on the credited interest — widened the gap further. His one compromise was inflation: $2,304.98 per month is fixed in nominal dollars, so he paired the annuity with equities earmarked for later years, letting the guaranteed stream handle the near term while growth assets handle the far term.
Annuity math connects to several neighboring tools. Our Compound Interest Calculator isolates the deferral-growth stage so you can test rates and horizons independently. The Retirement Calculator places annuity income inside your full retirement picture alongside savings and Social Security. And the Financial Calculators hub gathers every tool for comparing strategies side by side.
These questions dig into the practical details buyers ask after the basics are covered — how the product compares with bank alternatives, how inflation interacts with fixed payouts, and how the tax treatment works.
Deferred fixed annuity: insurance contract with accumulation (deferral) phase then payout phase. Formulas: FV = P(1+r)^t; annual payout = FV × r / (1 − (1+r)^−n); monthly = annual/12; total paid = annual × n. Example: $100,000 at 5%, 10-year deferral, 20-year payout → FV $162,889.46, payout $13,070.67/yr ($1,089.22/mo), total $261,413.40. Growth is tax-deferred; interest portion of payouts taxed as ordinary income via exclusion ratio. Fixed means guaranteed nominal amounts — not inflation-adjusted. Surrender charges apply to early withdrawals beyond free-withdrawal provisions. Distinct from variable/indexed annuities (market-linked) and immediate annuities (payouts begin within a year).
Cite this page: Deferred Fixed Annuity Calculator — SigmaCalculator.net. Formulas follow standard time-value-of-money mathematics; for contract specifics consult the annuity prospectus and a licensed financial professional. Tax notes are general information, not tax advice.
Both offer guaranteed rates, but they differ in taxes, term, and purpose. CD interest is taxed each year; annuity growth is tax-deferred until withdrawal. CDs are bank products with FDIC insurance and terms up to five years; annuities are insurance contracts with surrender periods but the unique ability to convert savings into guaranteed lifetime income. A CD cannot pay you a monthly check for life — annuitization can.
No — that is what 'fixed' means. Your $1,089.22 monthly payout stays $1,089.22 in nominal dollars for the entire payout period, while inflation quietly reduces what it buys. At 3% annual inflation, its purchasing power halves in about 24 years. This is why planners pair fixed annuities with growth investments: the annuity guarantees the floor, and equities or inflation-linked assets protect the ceiling. Some contracts offer cost-of-living riders that raise payouts annually, but they start lower and cost extra.
The exclusion ratio determines how much of each annuity payout is tax-free return of your own principal versus taxable interest. If you paid $100,000 and will receive $261,413.44 total, about 38% of each payment is excluded from tax and 62% is taxed as ordinary income. The ratio applies until you have recovered your full principal; afterward, payments are fully taxable. It applies to non-qualified annuities bought with after-tax dollars — qualified annuities funded from an IRA are fully taxable.