Question 1

What is MIRR (Modified Internal Rate of Return) and why is it superior to standard IRR?

Accepted Answer

Standard IRR inherently assumes that all interim cash flows are reinvested at the project's own IRR rate, which unrealistically overstates the profitability of high-return projects. MIRR corrects this flaw by assuming interim cash flows are reinvested at the firm's actual cost of capital or market reinvestment rate.

Question 2

How does MIRR prevent multiple internal rate of return anomalies?

Accepted Answer

Projects with non-normal cash flows (where cash flows switch between positive and negative across years) can generate multiple IRRs in standard polynomial equations. MIRR guarantees a single, unique mathematical solution by converting all outflows to a single PV and all inflows to a single FV.

Question 3

Standard IRR vs. MIRR: How do project rankings diverge in capital allocation?

Accepted Answer

Standard IRR tends to inflate the perceived yield of aggressive projects with early cash flows. MIRR compresses these rates toward the realistic reinvestment benchmark, aligning project ranking with Net Present Value (NPV) decision criteria.

Question 4

Can you provide a step-by-step worked numerical example of MIRR calculation?

Accepted Answer

Assume an initial investment of $50,000 (n = 4 years), generating inflows of $20,000/year, with a financing rate of 8% and a reinvestment rate of 10%. Step 1: PV of outflows = $50,000. Step 2: Future value of inflows at year 4: Year 1 ($20,000 × 1.10^3 = $26,620), Year 2 ($20,000 × 1.10^2 = $24,200), Year 3 ($20,000 × 1.10^1 = $22,000), Year 4 ($20,000 × 1.10^0 = $20,000). Total Terminal FV = $92,820. Step 3: Ratio = $92,820 / $50,000 = 1.8564. Step 4: MIRR = 1.8564^(1/4) - 1 = 1.1672 - 1 = 16.72% MIRR.

Question 5

What are common pitfalls when configuring financing and reinvestment rates?

Accepted Answer

Setting the reinvestment rate equal to the project's internal yield instead of the realistic corporate cost of capital re-introduces IRR bias. Always use the company's Weighted Average Cost of Capital (WACC) or current treasury/money market rate.

Question 6

Is my commercial budgeting and corporate rate data secure?

Accepted Answer

Yes. All MIRR computations execute exclusively in your local browser sandbox memory with zero server transmission, guaranteeing complete data privacy for corporate strategy.

Question 7

What is a standard benchmark spread between IRR and MIRR?

Accepted Answer

For highly profitable projects with standard IRRs above 25%, the MIRR is typically 5% to 10% lower (e.g. an 18% MIRR vs a 28% IRR), representing the true realistic geometric compounding rate.

Period	Inflow Received	Compounding Years	Terminal Value at Year 4
Year 1	+$20,000.00	3 yrs	+$26,620.00
Year 2	+$20,000.00	2 yrs	+$24,200.00
Year 3	+$20,000.00	1 yrs	+$22,000.00
Year 4	+$20,000.00	0 yrs	+$20,000.00

Evaluation Criteria	ToolboxDock (Client-Side)	Traditional Online Calculators
Financial Data Privacy	100% Local (Never leaves device RAM)	Logged on remote servers and ad networks
Calculation Latency	Instant real-time update on keystroke	Full page reloads or API round-trips
Offline Usability	Works offline once cached in browser	Fails without active server connection
Cost & Paywalls	100% free with unlimited calculations	Usage caps or financial product paywalls

Period	Inflow Received	Compounding Years	Terminal Value at Year 4
Year 1	+$20,000.00	3 yrs	+$26,620.00
Year 2	+$20,000.00	2 yrs	+$24,200.00
Year 3	+$20,000.00	1 yrs	+$22,000.00
Year 4	+$20,000.00	0 yrs	+$20,000.00

MIRR Calculator

MIRR Project Parameters

16.73%annualized MIRR

Terminal Inflow Value

Total Undiscounted Inflows

Terminal Wealth Ratio

Inflow Reinvestment Compounding Schedule

What is the MIRR Calculator?

Financial Calculation Inputs

Output & Schedule Breakdown

How to Use the MIRR Calculator

1. Enter Project Investment & Inflows

2. Configure Financing & Reinvestment Rates

3. Evaluate True Modified IRR (MIRR)

Financial Privacy & Architecture Comparison

Modified Internal Rate of Return (MIRR) Formula

Core MIRR Calculator Inputs & Terminology

Frequently Asked Questions

Explore Related Finance Tools