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Deferred Annuity Calculator

Estimate how a lump sum and monthly contributions may grow during a deferral period, then convert the balance into level monthly withdrawals.

Published

Monthly withdrawal
Monthly withdrawal for 20 years
$1,045.36
Balance when payouts start
$172,507.43
Total withdrawals
$250,886.67
Total contributed
$95,000.00
Investment growth
$155,886.67
Number of monthly withdrawals
240

$50,000.00 plus $250.00/mo for 15 years at 5% builds an estimated $172,507.43.

Money already in the annuity at the start of the deferral period.
$
Additional deposits made at the end of each month before payouts begin.
$
yr
%/yr
yr
%/yr

Results update as you type.

Deferred Annuity Calculator

A deferred annuity has a waiting period before income begins. This calculator models that sequence in two stages. First, it grows a lump sum and any monthly contributions through the deferral period. Second, it converts the balance at the payout start date into level monthly withdrawals for a fixed number of years. The result is not an insurance quote; it is a transparent time-value-of-money estimate for delayed income planning.

This page is different from the annuity payout calculator, which assumes the balance is already available and solves only for the payout. It is also different from the future value of annuity calculator, which focuses on the accumulation value of equal payments, and from the present value of annuity calculator, which discounts future payments to today. For a broader deposit-or-withdrawal view, use the annuity calculator.

How the deferred-annuity calculation works

The form asks for a lump sum today, monthly contribution, years before payouts, accumulation return, withdrawal period, and payout return. The calculator converts the deferral years to months by multiplying by 12 and rounding. It converts the annual accumulation return to a monthly rate by dividing by 12. The starting balance grows for all accumulation months, while the monthly contributions are treated as end-of-month deposits.

At the payout date, the calculator adds the grown starting balance and the future value of the monthly contribution stream. Then it converts the annual payout return to a monthly rate and solves for a level monthly withdrawal over the rounded number of payout months. The result panel shows the balance when payouts start, total withdrawals, total contributed, investment growth, and number of monthly withdrawals.

Formula

For the deferral stage, let PV be the lump sum today, PMT be the monthly contribution, r be the monthly accumulation rate, and n be the number of accumulation months. The future balance is:

balance at payout=PV(1+r)n+PMT×(1+r)n−1r\text{balance at payout} = \text{PV}(1+r)^n + \text{PMT} \times \frac{(1+r)^n - 1}{r}

If the accumulation rate is zero, the contribution portion is simply PMT times n. For the payout stage, let i be the monthly payout rate and m be the number of monthly withdrawals. The level withdrawal is:

monthly withdrawal=balance at payout×i1−(1+i)−m\text{monthly withdrawal} = \frac{\text{balance at payout} \times i}{1 - (1+i)^{-m}}

If the payout rate is zero, the withdrawal is the balance divided by m. The form does not include an annuity-due switch; withdrawals are modeled with the ordinary end-of-period formula.

Example: valuing a deferred annuity

The default inputs are a $50,000 lump sum, a $250 monthly contribution, 15 years before payouts, a 5% annual accumulation return, a 20-year withdrawal period, and a 4% annual payout return. The deferral period is rounded to 180 months. The monthly accumulation rate is 5% divided by 12, or about 0.4167%.

The starting balance grows by a factor of about 2.113703932, so the $50,000 lump sum becomes $105,685.20. The end-of-month contribution stream grows to $66,822.24. Together, the balance when payouts start is $172,507.43.

The payout period is 240 months. The monthly payout rate is 4% divided by 12, or about 0.3333%. Applying the ordinary annuity payment formula gives a monthly withdrawal of $1,045.36. Total contributed is $95,000, total withdrawals are $250,886.67, and the calculator labels the difference, $155,886.67, as investment growth.

Deferred annuity concept versus insurance product

In a math model, deferred annuity simply means income starts later. In the insurance marketplace, a deferred annuity is a contract with legal terms. It may be fixed, indexed, or variable. It may have surrender charges, market value adjustments, rider fees, guaranteed withdrawal benefits, death benefits, required annuitization rules, tax deferral, and penalties for early withdrawals. A deferred income annuity can also include life-contingent payments that depend on mortality assumptions.

This calculator does not attempt to price those features. It assumes monthly compounding, constant returns, end-of-month contributions, and fixed-period monthly withdrawals. That makes the math easy to audit, but it also means the result should be compared with actual contract illustrations only after fees, guarantees, liquidity, inflation protection, and tax treatment are understood.

Ordinary versus due considerations

The accumulation phase assumes ordinary end-of-month contributions. If you contribute at the beginning of every month, the real balance would be slightly higher because each deposit would earn one extra month of return. The payout phase also uses an ordinary end-of-month withdrawal formula. If income must arrive at the beginning of each month, a beginning-payment model would produce a slightly smaller monthly withdrawal for the same balance and term.

For a dedicated comparison of ordinary and due payout timing, use the annuity payout calculator. For a dedicated comparison of ordinary and due accumulation timing, use the future value of annuity calculator.

Tips for stronger planning

  • Model accumulation and payout rates separately. Retirement portfolios often become more conservative as income begins.
  • Try shorter and longer deferral periods. Extra time can change both contributions and compounding.
  • Include only contributions you can realistically maintain.
  • Run a zero-return or low-return scenario to see how dependent the plan is on investment growth.
  • Remember that inflation can erode a fixed monthly withdrawal over a long payout period.

Informational note

This calculator is for education and planning. It does not provide tax, investment, legal, or insurance advice. Review product disclosures, fees, guarantees, surrender terms, insurer strength, and retirement income needs before making annuity decisions.

Sources

  • CFPB Regulation Z — current through 2026-07-09; Consumer-finance rate/payment terminology; annuity payout assumptions require contract-specific disclosure.
  • Calculation scope: The equations and assumptions described above are applied only to values entered in the form. No live rates, prices, tax rules, lender terms, or accounting classifications are fetched. Results are user scenarios, not quotes or prescribed classifications.

Frequently asked questions

What does the deferred annuity calculator estimate?
It estimates two linked stages: how a lump sum and monthly deposits grow before payouts begin, and how much level monthly income the resulting balance can support during the selected withdrawal period.
How is this different from an annuity payout calculator?
An annuity payout calculator starts at the payout date with a known balance. This deferred annuity calculator starts earlier. It first builds the future balance through monthly compounding and contributions, then calculates withdrawals from that future balance.
What timing does the calculator assume for contributions?
Monthly contributions are treated as end-of-month deposits during the deferral period. The starting balance grows for the full deferral period, and each monthly contribution earns return from the month after it is made through the payout start date.
What timing does it assume for withdrawals?
The payout stage calculates level monthly withdrawals using the standard ordinary annuity payment formula. That means withdrawals are modeled as end-of-month payments. The calculator does not include a beginning-of-month payout option on this page.
Is this a deferred income annuity quote?
No. It is a planning model for accumulation and fixed-period withdrawals. A real deferred income annuity may use mortality assumptions, insurer pricing, surrender provisions, guarantees, tax rules, inflation options, and fees that are not included in this calculation.
Why are accumulation and payout rates separate?
The investment approach before income starts can differ from the approach during withdrawals. Separate rates let you model a growth-oriented deferral phase and a more conservative payout phase, while still keeping the mechanics simple and transparent.

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