What Is an Investment Income Calculator?
An investment income calculator is a financial planning tool that helps you estimate the passive income your portfolio can generate from dividends, interest payments, and other distributions. Unlike growth calculators that focus on total portfolio value, an income calculator models periodic income under your assumptions. It is not a forecast of money that will arrive in a brokerage account.
Our free investment income calculator goes beyond simple yield calculations by factoring in taxes, inflation, yield growth, and reinvestment options. Whether you are building a retirement income stream, planning for financial independence, or evaluating dividend-paying stocks, the output is a scenario for reviewing those assumptions.
How to Use This Investment Income Calculator
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Choose a Calculation Mode
Select one of four tabs: Income (estimate income from your portfolio), Required Portfolio (find the portfolio size needed for a target income), Required Yield (find the yield needed), or Time to Goal (find how long to reach a cumulative income target).
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Enter Your Portfolio Details
Input your portfolio value, annual yield (dividend or interest rate), and income frequency. Set the tax rate on your investment income, expected inflation rate, and how much income you plan to reinvest.
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Click Calculate
Press the Calculate button to see your projected income. The calculator displays annual and monthly net income, total tax paid, inflation-adjusted income, and visual breakdowns with charts.
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Review the Income Schedule
Scroll down to see a detailed table showing gross income, taxes, net income, real (inflation-adjusted) income, and cumulative income for each year. Toggle between annual and monthly views for all modeled months.
Four Calculation Modes Explained
Income
Model hypothetical income for each year, factoring in taxes, inflation, yield growth, and reinvestment.
Required Portfolio
Determine the portfolio size you need to achieve a specific annual income target at a given yield and tax rate.
Required Yield
Solve a first-year after-tax income target within a 0–100% initial-yield range. A numerical result does not establish that such a yield is available or sustainable.
Time to Goal
Find the first whole year reaching a cumulative after-tax income target, including reinvested amounts. Unreachable goals within 100 years return no result.
Understanding Investment Income
Investment income is the cash flow generated by your portfolio without selling any assets. The most common sources include stock dividends, bond coupon payments, REIT distributions, and interest from savings or CDs. For income-focused investors, the yield — the annual income expressed as a percentage of portfolio value — is the key metric that determines how much cash flow your investments produce.
Illustrative example: $500,000 at 4% yield, a 15% flat scenario tax rate and no reinvestment gives $20,000 gross and $17,000 after-tax income in year one. With 2% annual yield-assumption growth, ten-year cumulative after-tax income is about $186,145. The monthly $1,416.67 figure is an average; quarterly payments arrive at quarter-end in this model.
Key Factors Affecting Investment Income
Dividend Yield & Interest Rate
Use an explicit scenario yield. No fixed stock, REIT, bond or savings-account yield range is assumed. A distribution can include return of capital; a quoted yield is not the same as total return or a guarantee of future payouts.
Tax Rate on Investment Income
The calculator applies one entered rate to every payment. Actual tax depends on classification, jurisdiction and account rules. U.S. REIT distributions can include capital gains or return of capital, and some interest is tax-exempt. It does not model these distinctions or tax brackets. See IRS dividends and distributions and interest income.
Inflation Impact
Inflation erodes the purchasing power of your investment income over time. If your portfolio generates $20,000 per year and inflation averages 3%, that income will have the purchasing power of only $14,882 in 10 years. This is a fixed-inflation illustration, not an inflation forecast. The model discounts annual income at each year-end.
Reinvestment Strategy
Reinvesting a portion of your income back into the portfolio increases your future income through compounding. The reinvested portion is unavailable to spend. This calculation assumes unchanged capital value except for reinvestment; it does not simulate price gains, losses or the price adjustment when a distribution is paid.