Calculator Inputs
Example Data Table
| Scenario | Start | Contribution | Years | Nominal Return | Compounding |
|---|---|---|---|---|---|
| Starter Plan | $5,000 | $250 monthly | 5 | 6.50% | Monthly |
| Growth Plan | $10,000 | $500 monthly | 10 | 8.00% | Monthly |
| Long Horizon | $25,000 | $1,000 monthly | 20 | 9.00% | Monthly |
Formula Used
The calculator first converts the nominal annual return into an effective annual return using EAR = (1 + r / m)m - 1, where r is the nominal rate and m is compounding periods per year.
It then applies annual fee drag as a reduction to the effective growth factor. Contributions are added at the beginning or end of each selected contribution period, and balance growth is simulated step by step across the full timeline.
Estimated after tax value is computed as Total Contributions + Gain × (1 - tax rate) whenever gains are positive. Real future value is then adjusted for inflation using Real Value = Nominal Value / (1 + i)n.
This is a planning model. Real tax treatment may differ by account type, asset mix, and jurisdiction.
How to Use This Calculator
- Enter your starting investment amount.
- Add the amount you plan to contribute each period.
- Choose years, nominal return, and compounding frequency.
- Set contribution timing, annual fees, tax rate, and inflation.
- Enter a target value if you want the calculator to estimate the required return.
- Press the calculate button to see results above the form.
- Use the CSV or PDF buttons to export your result summary and yearly table.
Frequently Asked Questions
1. What does compound rate mean in investing?
It describes how investment returns grow on both the original capital and past earnings over time. More frequent compounding usually increases final value slightly.
2. Why does the calculator show effective annual rate?
Effective annual rate converts nominal return and compounding frequency into one comparable yearly growth figure. It helps you compare options with different compounding schedules.
3. How are fees handled here?
Annual fees are treated as a drag on yearly growth. This gives a practical estimate of how management costs can reduce long term portfolio performance.
4. Does the tax estimate reflect every real situation?
No. This model applies a simple tax rate to positive gains for planning. Actual taxes may depend on timing, account type, holding period, and local rules.
5. Why include inflation?
Inflation shows the purchasing power of your future balance. A portfolio may grow in money terms while buying less in real terms.
6. What is the required nominal rate result?
It estimates the annual nominal return needed to hit your target future value after accounting for contributions, fees, taxes, timing, and compounding.
7. Can I use this for retirement planning?
Yes, it works well for rough retirement projections. For full retirement planning, also test withdrawal rates, inflation changes, and shifting contribution levels.