Estimate what a mutual fund investment may be worth after sales loads and ongoing expenses. The results separate principal, contributions, net return, and fees, then calculate the investment's after-fee annual IRR.
How to use this calculator
Enter the starting investment, recurring additions, expected return, and the fees requested by the form. Compare the projected balance with total contributions to separate investment growth from new money. A constant return is a scenario assumption, not a forecast.
Examples
Reference investment
$20,000 initially plus $1,000 monthly for five years, at 5% before a 0.5% expense ratio and a 2% sales load, ends near $90,077. Total contributed principal is $80,000 and net IRR is about 3.844%.
No fees
With the same deposits and return but no loads or expenses, the ending value rises to about $93,339.
Formula
The gross annual return minus the expense ratio is converted to an equivalent monthly rate:
i = (1 + (return − expenses))^(1/12) − 1. Each contribution is reduced by the front-end load before it enters the fund. At redemption, the deferred charge applies to the lesser of principal or fund value.
Fees, taxes, and prospectus terms
The model approximates operating expenses by subtracting one constant expense ratio from the entered gross return. It applies one flat front load to every contribution and one flat deferred charge at redemption; actual breakpoints, share classes, waivers, declining schedules, account fees, distributions, and taxes are outside the model. The SEC mutual-fund fee guide explains that actual fees appear in the prospectus fee table.