What is this page best for comparing?

It is best for comparing how annual contribution, starting balance, retirement age, and return assumptions may change long-term account size.

Does the page enforce real Roth IRA contribution limits?

No. The current implementation does not validate IRS annual caps or income eligibility and simply calculates from what you enter.

Is the tax-savings figure a real tax deduction amount?

No. The current page estimates tax savings as total earnings times tax rate, which is closer to a display value for tax-free growth.

Are annual contributions added at the beginning or end of the year?

The current implementation adds each annual contribution before that year's growth, so it behaves more like a beginning-of-year contribution model.

Roth IRA Calculator - Full Guide

What This Calculator Does

This page is best for a long-term account-planning question. If you keep contributing to a Roth IRA, how large might the account become by retirement, how much of that total comes from your own contributions, and how much of the value comes from tax-free growth? Many users care about that mix, not only about the final balance alone.

The current Roth IRA page uses annual contribution, current age, retirement age, current balance, expected return, and tax rate to estimate total contributions, total earnings, display tax savings, and final balance. It is best for long-term planning and scenario comparison rather than for formal tax analysis.

When to Use It

You want a rough estimate of long-term Roth IRA growth.
You want to compare contributing more, starting earlier, or extending the time horizon.
You want a more visible way to think about the value of tax-free growth.
You need an account-size planning tool rather than a tax engine.

Inputs Explained

Annual Contribution

This is the amount you plan to add each year. The current page does not check legal contribution limits or eligibility rules, so you still need to apply real-world judgment.

Current Age and Retirement Age

These inputs determine how many years remain for contributions and growth before retirement. Time is one of the strongest drivers in the model because compounding is highly sensitive to horizon length.

Current Balance and Expected Return

Current balance is the asset base already in the account. Expected return is the long-term growth assumption and one of the most influential inputs in the entire model.

Tax Rate

Tax rate does not change the growth path of the account itself. It only affects the page's display-style tax-savings estimate so you can visualize the rough value of tax-free growth.

How the Calculation Works

The current implementation first calculates the number of years until retirement and then simulates growth year by year. In each year, the page adds the annual contribution first and then applies one year of growth to the combined balance.

At the end it reports.

total contributions = starting balance plus all annual contributions
total earnings = final balance minus total contributions
display tax savings = total earnings x tax rate
final balance = projected retirement account size

That means the model behaves more like a beginning-of-year contribution case with annual compounding, not like a monthly-contribution or full market-path simulation.

Example

Suppose you are 30, plan to retire at 65, have a current balance of 0, contribute 6000 per year, assume 7% return, and use a 22% tax rate. The page compounds the balance year by year, then shows total contributions, total earnings, display tax savings, and final balance.

The most useful part of the example is that it shows how starting earlier and contributing consistently can change the long-term outcome far more than many people expect.

How to Understand the Result

Final Balance

This is the headline output and answers the question, "If I stay on this path, how large might the account be by retirement?"

Total Contributions and Total Earnings

These help separate what came from your own deposits and what came from long-term growth.

Display Tax Savings

This is the easiest result to misuse. It is best read as a visualization of potential tax-free-growth value, not as a literal tax deduction amount.

Common Mistakes

Treating the entered annual contribution as if it is always legally allowed in real life.
Reading display tax savings as a real filing deduction.
Forgetting that the model assumes beginning-of-year contributions and annual growth.
Using one return assumption as if it captures the full uncertainty of long-term investing.

The current page does not validate real IRS contribution caps, catch-up rules, or income eligibility.
Tax savings are a display estimate, and the model uses a simplified beginning-of-year contribution plus annual-growth structure.

Roth IRA Calculator Guide

Full Guide