Annuity Calculator
Project annuity accumulation from starting principal, regular additions, contribution timing, growth rate, and time horizon
Calculate with Annuity Calculator
Results
Accumulation Schedule
| Year | Addition | Return | Ending balance |
|---|---|---|---|
| 1 | $10,000.00 | $1,850.33 | $31,850.33 |
| 2 | $10,000.00 | $2,581.24 | $44,431.57 |
| 3 | $10,000.00 | $3,357.22 | $57,788.79 |
| 4 | $10,000.00 | $4,181.06 | $71,969.86 |
| 5 | $10,000.00 | $5,055.72 | $87,025.58 |
| 6 | $10,000.00 | $5,984.33 | $103,009.90 |
| 7 | $10,000.00 | $6,970.20 | $119,980.11 |
| 8 | $10,000.00 | $8,016.89 | $137,996.99 |
| 9 | $10,000.00 | $9,128.13 | $157,125.13 |
| 10 | $10,000.00 | $10,307.91 | $177,433.04 |
Assumptions
Use Annuity Calculator for retirement-income and benefit planning when you need a clear estimate, transparent inputs, and a result you can review before taking the next step.
Worked example
When To Use Annuity Calculator
- Start with a representative scenario in Annuity Calculator so rates, dates, balances, or other key assumptions match the question you are comparing.
- Review whether the estimate matches the planning scenario before you use it for a budget, plan, or discussion.
Sample Input And Output Checks
- Start with inputs that match the real scenario, not only a rounded placeholder.
- Review age, contribution rate, return assumption, inflation, tax treatment, and withdrawal timing before trusting the output.
- Treat projections as planning ranges; market returns, law changes, health costs, and benefit eligibility can materially change the result.
About This Tool
Our comprehensive annuity calculator helps you project the accumulation phase of an annuity, showing how regular deposits grow over time with compound interest. This tool is designed for the growth phase where you're building your annuity balance through starting principal and regular additions (annual or monthly). Unlike payout calculators that show income distribution, this accumulation calculator demonstrates how your contributions compound to build retirement savings. Input your starting principal, regular contribution amounts, growth rate, and time horizon to see detailed projections of your annuity's future value. The calculator provides year-by-year breakdowns showing contributions, investment returns, and ending balances, plus visual charts illustrating how your principal, additions, and earned interest combine to grow your retirement nest egg. For comprehensive retirement planning that includes annuities alongside other accounts, use our Retirement Calculator.
Understanding Annuity Due vs Ordinary Annuity
The timing of your contributions significantly impacts accumulation—this calculator lets you choose between annuity due (contributions at period beginning) and ordinary annuity (contributions at period end). Annuity due means you deposit money at the start of each period (month or year), allowing that contribution to earn interest for the entire period. Ordinary annuity deposits occur at period end, earning no interest during that first period. For example, with $10,000 annual contributions at 6% growth over 10 years: annuity due (beginning) accumulates to $140,487, while ordinary annuity (end) reaches only $132,516—an $7,971 difference. The earlier timing of annuity due contributions provides an extra compounding period each year, equivalent to earning one additional period of interest on every contribution. Most retirement accounts like 401(k)s and IRAs function as ordinary annuities since contributions are typically made from paychecks throughout the year and invested shortly after. However, if you make lump-sum contributions at year start (like maxing out your IRA in January rather than December), you're effectively using annuity due timing and will see higher growth. The calculator defaults to annuity due (beginning) to show the maximum potential accumulation, but you can switch to ordinary annuity (end) for more conservative projections or to match your actual contribution timing.
Using the Accumulation Schedule and Visualization
The calculator provides detailed accumulation schedules in both annual and monthly views, showing exactly how your annuity grows period by period. The annual schedule displays each year's additions (contributions made that year), return (interest earned), and ending balance, making it easy to track progress toward retirement goals. For example, starting with $20,000 principal and adding $10,000 annually at 6% growth, year 1 shows $10,000 addition, $1,800 return, and $31,800 ending balance. By year 10, the ending balance reaches $175,533—comprising your $20,000 starting principal, $100,000 in contributions, and $55,533 in compound interest. The monthly schedule provides even more granular detail, useful for understanding how monthly contributions compound throughout each year. The pie chart visualizes the composition of your final balance, showing what percentage comes from starting principal (typically 10-15% for long accumulation periods), additions (50-60%), and investment returns (30-40%). The stacked bar chart displays year-by-year growth, with each bar divided into three colored sections representing principal, cumulative additions, and cumulative returns. This visualization makes it immediately clear how compound interest accelerates growth—early years show mostly principal and additions with small return sections, while later years show returns becoming an increasingly large portion of total balance as compound interest works its magic.
Integrating Annuities into Your Retirement Strategy
Annuities can be one component of a retirement income plan alongside Social Security, pensions, cash reserves, and investment portfolios. Use this accumulation calculator to project a deferred annuity balance from user-entered contribution and growth assumptions, then compare that balance with payout estimates, fees, surrender charges, insurer terms, and tax treatment before relying on it. For claiming-age context, use our Social Security Calculator. For income distribution scenarios, use our Annuity Payout Calculator. This page shows accumulation only and does not quote insurer guarantees or recommend an annuity allocation.