FEES
Fees
Declared, not buried.
Costs are surfaced in the result panel, never hidden in a disclaimer. An annual expense ratio is charged as a small monthly drag, applied at each month-end so it compounds exactly as a real fund fee would. The headline value is always net of every fee we charge — there is no separate 'gross' number that flatters before costs.
The equation
Vⁿᵉᵗₘ = Vᵍʳᵒˢˢₘ · (1 − f)
f = (1 + fee%)^(1/12) − 1
Vⁿᵉᵗₘbalance after the fee at month m
Vᵍʳᵒˢˢₘbalance before the fee at month m
fmonthly slice of the annual expense ratio
fee%the annual fund / management fee you enter
Assumptions
- 01The annual expense ratio is converted to a compounded monthly drag, not divided flat by 12.
- 02The fee is applied at each month-end, so it compounds over the full horizon.
- 03Only fees you can see in the input are charged — no hidden spread or transaction cost is added.
- 04Taxes (income, dividend, capital-gains) are not modeled — see Known limitations.
Source series
Audit log
v3.0Jun 27 2026Removed unmodeled capital-gains tax claim; page now documents only the real expense-ratio drag.
v1.8Aug 04 2025Moved fees out of the disclaimer.