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Return on net assets compares net income with net fixed assets plus a defined working-capital balance. Build the denominator from an approved asset schedule and balance sheet, then reconcile two business units to the company total.
The return on net assets formula divides net income by net fixed assets plus working capital. It shows earnings relative to a defined net asset base, so the denominator policy matters as much as the percentage. For business-unit comparisons, use the same income allocations, asset classifications and balance dates throughout.
RONA = Net income / (Net fixed assets + Working capital)
Net fixed assets = Fixed-asset carrying amount after accumulated depreciation and applicable impairment
Working capital used here = Current assets - Current liabilities
Multiply the ratio by 100 to express it as a percentage. This article uses closing balances and net income after interest and income taxes. Label the result closing-balance, net-income RONA in the report so readers can reproduce it.
The SEC's guide to financial statements defines working capital as current assets minus current liabilities. That is the definition used below: cash stays in current assets, and short-term borrowings stay in current liabilities. An operating working-capital definition would exclude financing balances and could produce a different denominator.
RONA is a management ratio with differing conventions. It is not automatically interchangeable with return on assets, which uses total assets, or with return on net operating assets, which matches after-tax operating profit to an operating asset base. Write the definition above the comparison rather than assuming the acronym settles it.
Start with the approved income statement, the fixed-asset schedule and the closing balance-sheet export. Retain period, entity, business unit, account, currency and amount. The fixed-asset schedule also needs gross carrying amount, accumulated depreciation and impairment where applicable.
Map every balance-sheet account once. An account cannot be both a fixed asset and part of working capital. Keep an unmapped-account list and resolve it before calculating the ratio. For shared assets, use the allocation already approved by finance; a writer or analyst should not create a new allocation merely to make the units comparable.
The income numerator must cover the same units as the asset schedules. If corporate interest or taxes are allocated to the units, retain those allocations in the income bridge. If management reports only operating profit by unit, do not relabel it net income. Choose the operating-return measure instead.
An illustrative US manufacturer compares East and West for the fiscal year ended September 30, 2026. All balances below are USD. Net income covers the full fiscal year; asset and liability balances are at September 30. There are no impairment adjustments in this example.
| Export row | East (USD) | West (USD) | Company (USD) |
|---|---|---|---|
| Gross property, plant and equipment | 6,000,000 | 3,000,000 | 9,000,000 |
| Accumulated depreciation, deduction | 2,000,000 | 1,000,000 | 3,000,000 |
| Cash | 300,000 | 200,000 | 500,000 |
| Trade receivables | 1,200,000 | 600,000 | 1,800,000 |
| Inventory | 1,400,000 | 700,000 | 2,100,000 |
| Prepaid expenses | 100,000 | 100,000 | 200,000 |
| Accounts payable | 1,100,000 | 450,000 | 1,550,000 |
| Current accrued liabilities | 500,000 | 150,000 | 650,000 |
| Short-term borrowings | 400,000 | 200,000 | 600,000 |
| Annual net income | 900,000 | 280,000 | 1,180,000 |
The company column sums the two units. There are no intercompany balances or consolidation adjustments in these illustrative rows. The following table shows every step of the calculation, with percentage results rounded to two decimal places.
| Calculation | East | West | Company |
|---|---|---|---|
| Net fixed assets: gross assets - depreciation (USD) | 4,000,000 | 2,000,000 | 6,000,000 |
| Current assets: cash + receivables + inventory + prepaids (USD) | 3,000,000 | 1,600,000 | 4,600,000 |
| Current liabilities: payables + accruals + borrowings (USD) | 2,000,000 | 800,000 | 2,800,000 |
| Working capital: current assets - current liabilities (USD) | 1,000,000 | 800,000 | 1,800,000 |
| RONA denominator: net fixed assets + working capital (USD) | 5,000,000 | 2,800,000 | 7,800,000 |
| Net income / denominator | 900,000 / 5,000,000 | 280,000 / 2,800,000 | 1,180,000 / 7,800,000 |
| Closing-balance RONA | 18.00% | 10.00% | 15.13% |
East earns more net income per dollar of the defined net asset base. The result does not establish why. Pricing, production costs, interest allocations, tax allocations and asset age can all contribute. Finance should bridge those differences before using RONA to judge an operating manager.
First reconcile each input schedule to its approved control total. The fixed-asset balances must match the ledger after depreciation and impairment. Current assets and current liabilities must match the balance-sheet classification. Net income must match the approved income report for the same scope.
Then rebuild the company result from the units:
Combined denominator = 5,000,000 + 2,800,000 = 7,800,000
Combined net income = 900,000 + 280,000 = 1,180,000
Company RONA = 1,180,000 / 7,800,000 = 15.13%, rounded
Use total income divided by the total denominator. Do not average the unit percentages. As a separate multiplication check, East's $5,000,000 times 18.00% equals $900,000, and West's $2,800,000 times 10.00% equals $280,000. Apply the company check using the unrounded ratio because the displayed percentage is rounded.
The controller owns the definitions and reconciliations. FP&A can then compare a unit with its own prior periods and with units using the same policies. Review changes in income separately from changes in net fixed assets and working capital.
An increase caused by lower inventory has a different operating explanation from an increase caused by asset depreciation. Aswath Damodaran's research on accounting return measures discusses how book values and accounting adjustments affect measured returns. An older, more depreciated asset base can make a business appear more productive without any improvement in output.
Use the return on fixed assets comparison when the question specifically concerns the fixed-asset base. Keep that narrower question separate from the working-capital and financing effects included here.
Bring an approved income export, fixed-asset schedule and balance-sheet file with finance's denominator definitions. Covirage maps the columns, and its tools compute and check the unit ratios and their company reconciliation; the external AI model explains the results with every figure traced to its rows. Create a free Covirage account, then set up your business and bring a sample of your own data.
See FP&A reporting for the broader reporting context.
No. Return on assets uses total assets as its denominator. This RONA definition uses net fixed assets plus working capital, which subtracts current liabilities from current assets. The different asset bases mean the percentages answer different questions and should carry separate labels.
Either convention can be used in management reporting if it is stated and applied consistently. Average balances usually match annual income more closely when assets change during the year. Closing balances show the return against the asset base at the reporting date.
With a positive denominator, negative RONA means the business reported a net loss. A negative denominator creates a different problem: the percentage can reverse its apparent meaning. Review the underlying balances and present the loss and asset base separately before interpreting that ratio.