How to Calculate Return on Investment (ROI): Step-by-Step
What Is ROI?
ROI, or return on investment, measures the gain or loss generated relative to the amount invested.
The basic question ROI attempts to answer is:
"How much did I gain compared to what I spent?"
The Basic ROI Formula
ROI = (Net Return ÷ Cost of Investment) × 100
Where:
Net Return = Total Return minus Total Costs
Cost of Investment = Total amount invested
Simple Example
You invest $10,000 and later sell the investment for $11,500. Total fees were $100.
Net Return:
$11,500 − $10,000 − $100 = $1,400
ROI:
($1,400 ÷ $10,000) × 100 = 14%
Step 1: Calculate Total Investment Cost
One of the most common mistakes is excluding costs.
Depending on the situation, total cost may include:
Purchase price
Commissions or transaction costs
Closing costs
Ongoing fees
Repairs or improvements
Operating expenses
Using consistent cost categories may help improve comparisons across different opportunities.
Step 2: Calculate Total Return
Return may come from multiple sources, including:
Price appreciation
Dividends
Interest income
Rental income
Business cash flow
Cost savings
Example Including Income
Assume a rental property generates:
$6,000 of net rental income
$9,000 of appreciation
Total cash invested: $75,000
Net Return = $15,000
ROI = ($15,000 ÷ $75,000) × 100 = 20%
This example is simplified and does not include financing, taxes, or future selling costs.
Step 3: Consider Time
ROI does not automatically account for how long an investment was held.
For example:
20% ROI over 1 year
20% ROI over 10 years
These outcomes are not equivalent.
When comparing investments with different holding periods, some investors also review annualized return measures to provide additional context.
While ROI measures the percentage gain or loss on an investment, it does not estimate how savings may grow over time through compounding. To explore how different contribution amounts, time horizons, and assumed rates of return may affect long-term investment growth, try our Free Compound Interest Calculator.
Step 4: Consider Taxes
Taxes may materially affect investment outcomes.
Depending on the investment, taxes may apply to:
Capital gains
Dividend income
Interest income
Rental income
State and local taxes
Many investors compare both pre-tax and after-tax results when evaluating opportunities.
An after-tax version of ROI may be expressed as:
After-Tax ROI = (After-Tax Net Return ÷ Total Cost) × 100
Because tax treatment varies based on individual circumstances, assumptions should be documented consistently when making comparisons.
Step 5: Understand ROI's Limitations
ROI is useful, but it does not capture every consideration.
Factors ROI may not fully reflect include:
Investment risk
Volatility
Timing of cash flows
Additional future investments
Liquidity constraints
For certain decisions, investors may also review metrics such as payback period, internal rate of return (IRR), or scenario analysis.
Common ROI Mistakes
Common errors include:
Leaving out fees and expenses
Ignoring taxes
Comparing investments with different time horizons
Using inconsistent definitions of cost and return
Treating unrealized gains as available cash
Where Compound Wealth Fits
Individuals seeking educational resources related to tax-planning topics and after-tax financial outcomes may review materials published by Compound Wealth. These resources may help readers prepare questions and organize discussions with their financial, legal, and tax professionals.
Frequently Asked Questions
What is considered a good ROI?
A "good" ROI depends on the investment type, risk level, time horizon, and available alternatives. ROI is generally most useful when comparing similar opportunities.
Should taxes be included in ROI calculations?
Many investors evaluate both pre-tax and after-tax ROI because taxes may materially affect outcomes.
Why can two investments have the same ROI but different results?
ROI does not account for factors such as risk, volatility, or how long the investment was held.
Is ROI useful for business decisions?
Many businesses use ROI to evaluate projects, equipment purchases, marketing campaigns, and other investments.
When should I use metrics besides ROI?
Additional metrics may be useful when evaluating long-term investments, uneven cash flows, financing arrangements, or projects with different time horizons.
About Compound Wealth
Tax planning often intersects with investment decisions, business ownership, retirement planning, and other financial considerations. Compound Wealth provides an integrated approach that combines tax planning, wealth management, accounting, and business transition services to help clients evaluate financial decisions from multiple perspectives as part of an ongoing planning process.
