The return on invested capital formula
Return on invested capital is NOPAT divided by invested capital, times one hundred: ROIC = NOPAT ÷ invested capital × 100. NOPAT is net operating profit after tax — the profit the business earns from running itself, as if it had no debt at all. Invested capital is shareholders' equity plus interest-bearing debt — all the money tied up in the business, from owners and lenders alike. The answer is a percentage: 15.00% means each $100 of invested capital earns $15.00 a year. Try the numbers on the return on invested capital calculator and it does the division for you.
Step 1: find the EBIT and the tax rate
Start with the income statement. EBIT is earnings before interest and tax — the profit from running the business, before the lenders and the taxman take their share. Here is the worked example: EBIT of $160,000 and a tax rate of 25%. Use the same year for both numbers, and use the tax rate the business actually pays, not the headline rate in the press.
Step 2: work out the NOPAT
Multiply the EBIT by one minus the tax rate. Here is the worked example: $160,000 × (1 − 25%) = $120,000 of NOPAT. The arithmetic is $160,000 × 0.75 = $120,000. NOPAT is the profit the business earns from running itself, as if it had no debt at all — interest is left out of it on purpose, because the interest belongs to the lenders, not to the business.
Step 3: add up the invested capital
Start with the balance sheet. Invested capital is shareholders' equity plus interest-bearing debt. Here is the worked example: $500,000 of equity plus $300,000 of debt is $800,000 of invested capital. The split matters: $300,000 of the $800,000 of capital is funded by borrowing — 37.5% debt, 62.5% equity. Only interest-bearing debt counts — trade creditors and unpaid bills are not invested capital.
Step 4: divide and read the answer
Divide the NOPAT by the invested capital and multiply by one hundred. Here is the worked example: $120,000 ÷ $800,000 × 100 = 15.00%. The arithmetic is $120,000 ÷ $800,000 = 0.15, so each $100 of invested capital earns $15.00 a year. The answer is a percentage, not a dollar amount — write it as 15.00%, not $15.00.
Three worked examples
Example one — the headline numbers. A business has $160,000 of EBIT at a 25% tax rate, $500,000 of equity and $300,000 of debt. The NOPAT is $120,000, the invested capital is $800,000, and the ROIC is 15.00%. Each $100 of invested capital earns $15.00 a year.
Example two — averaging the capital. A business began the year with $750,000 of invested capital and ended it with $850,000. The average capital is ($750,000 + $850,000) ÷ 2 = $800,000. With $120,000 of NOPAT, the ROIC is $120,000 ÷ $800,000 × 100 = 15.00%.
Example three — how much NOPAT must I earn? A business has $800,000 of invested capital and wants a 20.00% ROIC. The NOPAT needed is 20.00% × $800,000 = $160,000.00 — the after-tax profit the business must earn to hit the target on the capital it already has.
One reverse to check your answer
Work the numbers backwards to check them. A business has $800,000 of invested capital and wants an 18.00% ROIC. The smallest whole-dollar NOPAT for the ROIC to reach the target is $144,000 — $144,000 ÷ $800,000 is exactly the target. A dollar less, and the ROIC falls short of the line. The return on invested capital calculator runs the reverses for you.
Why the tax rate matters: NOPAT vs EBIT
EBIT is the profit before tax; NOPAT is the profit after tax. The tax rate is the bridge between them, and it matters: two businesses with the same EBIT show different ROICs if they pay different tax rates. A business with $160,000 of EBIT at 25% keeps $120,000 of NOPAT; the same EBIT at a higher rate keeps less. That is why ROIC uses NOPAT, not EBIT — the owners only keep what is left after the taxman.
What a high ROIC means
A high ROIC means the business earns a lot of after-tax profit on every dollar tied up in it. Above 15% is strong, 10% to 15% is solid, and below 10% is weak — but the bar moves by industry. Software and services run high because they need little capital; heavy industry and retail run low because they need a lot of it. The real test is the cost of capital: a ROIC above it means the business creates value on every new dollar it invests.
What a low ROIC means
A low ROIC means the business earns little after-tax profit on the capital tied up in it. Below 10% is weak, and a ROIC below the cost of capital is worse: each new dollar earns less than it costs, so growth destroys value. A low ROIC has two causes — thin margins, or too much capital for the profit it earns — and the fix depends on which one it is.
The ROIC vs return on equity difference
Return on equity uses net income divided by equity only — after interest, after tax, owners' money only — while ROIC uses NOPAT divided by ALL invested capital — before interest, after tax. A business can show a high return on equity from borrowing heavily while its ROIC is mediocre, and the ROIC tells you which one it is. Read the guide to return on equity and try the return on equity calculator for the shareholder side.
The ROIC vs return on capital employed difference
Return on capital employed uses EBIT divided by capital employed — before tax — while ROIC uses NOPAT divided by invested capital — after tax. ROIC is the after-tax view, closer to what the owners actually keep. The two move together when the tax rate is steady, but they part when it changes. Read the guide to return on capital employed and try the return on capital employed calculator for the before-tax view.
What to do when the ROIC is low
Two levers lift the ROIC. Margins: more NOPAT per dollar of sales — raise prices, cut costs, or drop the lines that lose money. Capital efficiency: less capital per dollar of profit — pay down debt, which lowers the capital and lifts the ROIC, or sell the assets that earn nothing. Retaining profits grows equity and lowers the ROIC unless profits grow too — so keep the capital working, not sitting.
Why average capital, not ending capital
The denominator is the average of the beginning and ending capital, not the ending balance alone. The reason is timing: capital moves through the year while the balance sheet is a snapshot. A business that raises money in December shows fat capital at year end and thin capital in January. Averaging the two ends of the year smooths the timing out.