Variable Annuity Calculator

The variable annuity calculator projects how a deferred variable annuity could accumulate before withdrawals begin. A variable annuity is different from a fixed annuity because the account value depends on investment options selected inside the contract, commonly called subaccounts. This calculator lets you enter a starting balance, current age, withdrawal age, contribution amount, payment frequency, payment timing, expected return, compounding frequency, annual contribution growth, and a tax rate for a simplified taxable-account comparison.

Informational, not financial advice. The calculator is a scenario engine, not a guarantee, prospectus, or suitability recommendation. Variable annuities can be complex insurance and securities products, so contract fees, surrender periods, rider costs, tax treatment, and investment risk should be reviewed before making a decision.

What the calculation does

The calculator measures the accumulation period as withdrawal age minus current age. It then multiplies that number of years by the selected contribution frequency. Monthly payments from age 30 to age 65 create 420 contribution periods. The stated annual return is converted into a periodic return based on the chosen compounding frequency. For example, a 12% return compounded yearly and applied to monthly contributions becomes an effective monthly growth rate of about 0.9489%.

The calculator then simulates each payment period. For every period, it determines the contribution amount for that year. If annual contribution growth is zero, the payment stays level. If growth is positive or negative, the payment changes by year, not by month. With annuity due timing, the contribution is added before that period’s growth. With ordinary annuity timing, the balance grows first and the contribution is added afterward.

This page connects naturally with the annuity calculator, the present value calculator, and the future value calculator. To isolate a single lump sum without contributions, use future value. To compare today’s value of future cash flows, use present value.

Formula and period-by-period method

The calculator converts the annual return into the periodic rate used for each contribution interval:

$r_p = \left(1 + \frac{\text{expected return}}{\text{compoundings per year}}\right)^{\frac{\text{compoundings per year}}{\text{payments per year}}} - 1$

For each period, the contribution is based on the year index:

$\text{payment for period} = C \times (1+\text{annual contribution growth})^{\text{year index}}$

For annuity due timing, the balance update is:

$\text{balance after period} = (\text{balance before period} + \text{payment}) \times (1+r_p)$

For ordinary annuity timing, the balance update is:

$\text{balance after period} = \text{balance before period} \times (1+r_p) + \text{payment}$

After all periods, total return and the taxable comparison are:

$\text{total return} = \text{ending balance} - \text{starting balance} - \text{total contributions}$

$\text{taxable comparison} = \text{ending balance} - \max(0,\text{total return}) \times \text{tax rate}$

Checking the primary result

The default inputs are $10,000 starting balance, current age 30, withdrawal age 65, $100 monthly contribution, ordinary timing, 12% expected annual return, yearly compounding, 0% annual contribution growth, and a 24% tax rate for the comparison.

The accumulation period is:

$65 - 30 = 35 \text{ years}$

Monthly contributions create:

$35 \times 12 = 420 \text{ contributions}$

With yearly compounding converted to monthly contribution intervals, the periodic return is about 0.9488793%. The calculator loops through 420 periods, compounds the balance, and adds each $100 contribution after growth because ordinary timing is selected. Total contributions are:

$420 \times \$100 = \$42{,}000$

The final balance before tax is $1,073,899.35. Subtracting the $10,000 starting balance and $42,000 of contributions leaves a total return of $1,021,899.35. The simplified taxable-account comparison subtracts 24% of that gain, producing $828,643.50.

When to use it

Use this calculator when you want to understand how sensitive a variable annuity accumulation scenario is to return, timing, and contributions. It is useful for comparing monthly versus yearly contributions, ordinary versus due timing, and level versus growing contributions. It can also show why high assumed returns dominate long projections: most of the default ending balance comes from investment return, not from direct contributions.

It is less useful for evaluating a specific contract unless you adjust inputs to reflect that contract’s economics. A variable annuity prospectus may list mortality and expense charges, subaccount expense ratios, administrative fees, rider costs, surrender charge schedules, and optional guarantees. Those costs should reduce the expected return or be modeled separately. The calculator also does not show income-phase annuitization, lifetime withdrawal benefits, death benefits, or required tax reporting.

Caveats for interpretation

The expected return is not guaranteed. Because variable annuity subaccounts invest in securities, the actual sequence of returns can differ sharply from a smooth compound rate. A strong average return with large early losses may produce a different practical outcome than the same average return earned steadily. Contribution growth is also simplified: payments change once per year based on the year index, so it does not capture midyear raises or irregular deposits.

The tax comparison is deliberately simplified. Variable annuity withdrawals are often taxed differently from taxable brokerage gains, and early withdrawals can involve penalties. Use this result to learn the mechanics, then compare it with official contract materials and tax guidance.

Sources

• SEC Investor.gov, Variable Annuities — investor guidance on variable annuity features, risks, fees, and tax considerations.
• SEC Investor.gov, Annuities — general annuity overview.
• CFI, Annuity — finance explanation of annuity payments and timing.