Compare SPAXX, FDLXX, and other money market funds with our free Money Market Fund Calculator.
Enter your investment amount, annual yield, and expense ratio to estimate net returns, monthly income, and annual earnings side by side.
Find out how different money market funds may affect your cash returns using your own figures.
Money Market Fund Comparison Calculator
Compare the potential income from SPAXX, FDLXX, and other money market funds using your own investment amount, yield, and expense ratio. Estimate annual and monthly income after fund expenses, then compare the results side by side.
Use your own figures from current fund documents. This calculator does not retrieve live yields or recommend a particular fund.
Compare Money Market Fund Income
Enter the same investment amount for each fund. Enter yield before expenses, then enter the annual expense ratio. If your yield is already net of expenses, enter 0% for the expense ratio to avoid subtracting it twice.
| Fund | Annual yield (%) | Expense ratio (%) | Net estimated yield (%) |
|---|---|---|---|
| SPAXX | 3.58% | ||
| FDLXX | 3.58% | ||
| 3.75% |
The starting figures are illustrative examples, not current fund yields or verified expense ratios. Replace them with figures from each fund’s latest official documents.
| Fund | Net yield | Annual income | Monthly equivalent | Period income |
|---|
Estimates assume the entered yield and expense ratio remain unchanged throughout the comparison period.
How to Use the Money Market Fund Calculator
This calculator helps you compare hypothetical income from money market funds using a consistent set of assumptions. Follow these steps:
- Enter the amount you plan to invest.
- Enter the annual yield for each fund.
- Enter each fund’s annual expense ratio.
- Set the period you want to compare.
- Review estimated net yields and income side by side.
The calculator updates when you change an input. It uses the same investment amount for all funds so you can compare the results on an equal basis.
What Is a Money Market Fund?
A money market mutual fund is an investment fund that seeks to provide income while maintaining liquidity and a stable share price, depending on the fund’s structure and investment objective. These funds commonly hold short-term debt and money market instruments.
Money market mutual funds are investments, not bank deposit accounts. They are not FDIC-insured, and it is possible to lose money. Review each fund’s prospectus and current information before investing.
SPAXX vs. FDLXX: What Should You Compare?
SPAXX and FDLXX are Fidelity money market mutual funds. Their yields, expenses, holdings, and tax characteristics may differ. The figures you enter should come from the same measurement date whenever possible.
Compare yields measured over the same period. A quoted yield is not a guarantee of future income.
Check whether the yield you use is already net of fund expenses before entering an expense ratio.
Review the fund’s holdings and tax information. Tax treatment can depend on your state and circumstances.
How Is Estimated Income Calculated?
For this calculator, net estimated yield equals the entered annual yield minus the entered annual expense ratio. Estimated annual income equals your investment amount multiplied by that net yield.
Monthly income is shown as an annual estimate divided by 12. It is not a prediction of the amount or timing of actual monthly distributions. Period income assumes a constant net yield and does not model reinvestment or compounding.
Important Limitations
- Yields can change over time.
- Actual distributions may differ from these estimates.
- The calculation does not include taxes or account fees.
- It does not model compounding or reinvested distributions.
- A higher estimated yield does not mean a fund is suitable for every investor.
Frequently Asked Questions
Is this a live SPAXX or FDLXX yield calculator?
No. You enter the yields and expense ratios yourself. This keeps the comparison transparent and lets you use figures from the latest fund documents.
Should I subtract the expense ratio from the quoted yield?
Only if the yield you entered is before expenses. Many published fund yields already reflect fund expenses. Check the definition of the yield before entering it. If it is already net of expenses, enter 0% for expenses to avoid subtracting them twice.
Does the calculator include taxes?
No. It compares estimated income before personal taxes. Tax treatment can depend on the fund’s income sources, your state, and your individual circumstances.
Does a money market fund have a guaranteed return?
No. Yields can change, and money market mutual funds are not bank deposits or FDIC-insured accounts. Review the fund’s risks and official disclosures.
Can I compare another money market fund?
Yes. Use the third row to enter another fund’s name, yield, and expense ratio. You can use the same row for any fund for which you have comparable figures.