Annuity Payout Calculator
If you have a lump sum and want to convert it into a steady stream of income over a fixed number of years, this calculator finds exactly how much you can withdraw each year — sized precisely so the balance reaches zero right at the end of your chosen payout period, not before and not with money left over.
How the Annuity Payout Calculator Works
Enter your starting balance, an assumed annual rate of return, and how many years you want the payout to last, and the calculator computes the fixed annual payment that would exactly deplete that balance to zero by the end of the specified period, accounting for continued growth on the remaining balance throughout the payout years. It also shows the monthly equivalent, total payout over the full period, and total interest earned along the way.
This Is a “Spend It Down” Model, Not a “Live Off the Interest” Strategy
This is worth understanding clearly, since it’s a fundamentally different approach than some other common retirement income strategies. This calculator specifically finds a payout designed to exhaust the entire balance by a chosen end date — every dollar, principal and growth combined, is meant to be paid out and none is meant to remain afterward. This is genuinely different from a strategy aimed at withdrawing only the growth while preserving the original principal indefinitely, which would produce a smaller, more conservative payment but leave the underlying balance intact for a longer, potentially indefinite period, or for eventual inheritance. Neither approach is inherently correct — they serve different goals, and this calculator specifically addresses the first: converting a lump sum into income over a defined, finite period.
Why the Assumed Return Rate Matters So Much to the Result
Because this calculator accounts for continued growth on the remaining balance throughout the payout period, the assumed annual return rate directly affects how large a payment the same starting balance can support — a higher assumed return allows a larger annual payout for the identical balance and time period, since more of the total payout is being funded by ongoing growth rather than depleting principal alone. This makes the return assumption one of the most consequential inputs in this calculator: an overly optimistic return assumption could lead to actual real-world underperformance relative to the calculated payout, potentially depleting the balance faster than planned if actual returns fall short of what was assumed throughout the payout period.
Why This Doesn’t Model Real Market Volatility
This calculator assumes a single, constant rate of return applied evenly across every year of the payout period — real investment returns, by contrast, vary year to year, sometimes significantly, even when averaging out to a similar long-term figure. A sequence of poor early returns during the payout period (sometimes called “sequence of returns risk”) can meaningfully affect how long a balance actually lasts compared to this calculator’s smooth, constant-rate projection, even if the average return over the full period ends up matching the assumed rate. This is a genuine limitation of any constant-rate payout calculation, not specific to this tool — real financial planning around variable investment returns during a payout phase typically involves more sophisticated modeling than a single fixed-rate assumption can capture.
Where This Calculation Actually Applies
This kind of period-certain payout calculation is directly relevant to structured settlement payouts, certain pension buyout decisions, converting a lump-sum retirement account into scheduled withdrawals over a planned retirement length, or any situation involving a known lump sum that needs to become a fixed income stream for a specific number of years rather than an open-ended or growth-only withdrawal strategy.
Building Toward a Lump Sum in the First Place
This calculator starts from an already-established lump sum. If you’re still in the accumulation phase, working toward building that balance in the first place, the Retirement Calculator handles that earlier growth phase, projecting how contributions and compound growth build toward a target balance you’d then bring to this calculator for the payout phase.
General Annuity Growth: Contributing Rather Than Withdrawing
It’s worth distinguishing this payout-focused calculator from the general Annuity Calculator on this site, which addresses the opposite direction — calculating the future value of a series of regular contributions growing over time, rather than converting an existing lump sum into a fixed withdrawal schedule. Use that calculator if you’re contributing regularly toward a future goal; use this one if you already have the lump sum and need to structure its payout.
Required Minimum Distributions: A Different, Mandatory Payout Structure
If your lump sum sits in a Traditional retirement account subject to Required Minimum Distributions, the IRS-mandated withdrawal schedule follows different rules than the fixed, self-chosen payout period this calculator computes — RMD amounts are recalculated annually based on a specific IRS table rather than being set as one fixed payment for a chosen number of years. The RMD Calculator handles that separate, legally mandated calculation.
Comparing Against a Level, Growth-Preserving Withdrawal Strategy
If you’re weighing this depletion-based approach against a strategy aimed at preserving principal while living off investment growth alone, the Interest Calculator can help model that alternative approach — projecting how much interest a balance generates without withdrawing principal, a genuinely different structure than this calculator’s finite payout period.
Frequently Asked Questions
Does the balance run out completely at the end of the payout period?
Yes — this calculator specifically finds the payment amount that reduces the balance to exactly zero at the end of your chosen period, assuming the assumed rate of return holds throughout. It’s designed to fully deplete the balance, not preserve any remaining principal.
Why does the assumed return rate matter so much to the calculated payout?
Because the calculation accounts for continued growth on the remaining balance throughout the payout period. A higher assumed return allows a larger annual payment for the same starting balance and time period, since more of the total payout is funded by ongoing growth rather than principal alone.
What happens if actual investment returns are lower than assumed?
The balance could be depleted faster than planned, potentially running out before the intended end of the payout period, since the calculated payment assumes the specified return rate holds consistently throughout — which real, variable market returns don’t guarantee.
What is the difference between this calculator and the Annuity Calculator?
This calculator converts an existing lump sum into a fixed payout over a chosen period, depleting the balance to zero. The Annuity Calculator instead calculates the future value of regular contributions growing over time — the accumulation phase rather than the payout phase.
Is this the same as an RMD calculation?
No — RMDs are a legally mandated withdrawal amount recalculated annually based on a specific IRS table, distinct from this calculator’s fixed, self-chosen payout designed to deplete a balance over a period you select yourself.