Net national income (NNI) is the income earned by a country's residents in a period after deducting the cost of the buildings, machinery, roads and other fixed assets worn out in producing it. It is calculated as gross national income (GNI) minus consumption of fixed capital, the national accounts term for depreciation. NNI comes closer than gross measures to what an economy could consume without running down its stock of productive capital, which is why economists often prefer it as a guide to sustainable income.
The measure is defined in the United Nations System of National Accounts (SNA), in the 2008 SNA and the 2025 SNA. It sits at the end of a chain that starts with gross domestic product (GDP), moves to GNI by adding net income from abroad, and then to NNI by subtracting depreciation. Older textbooks call NNI at factor cost simply "national income"; India's statistics office still uses per capita NNI as its headline measure of per capita income.
NNI in plain terms
A taxi driver takes home 50,000 rupees a month from fares. But each month the car loses some value through wear: tyres, engine and body all age, and one day the car must be replaced. If that wear is worth 10,000 rupees a month, the driver's true earnings are closer to 40,000. Spending all 50,000 every month would leave nothing to buy the next car.
GNI is like the 50,000; NNI is like the 40,000. It tells a country how much it can spend while still keeping its machines, buildings and roads in working order.
Formula and example
The standard calculation is:
Because GNI is itself GDP plus net primary income from abroad, the full chain is:
- is gross domestic product at market prices, which can be measured as expenditure-based GDP, income-based GDP or output-based GDP.
- is net primary income from abroad: wages, interest, dividends and profits received from non-residents minus those paid to them, including interest on external debt.
- is consumption of fixed capital: the decline in value of fixed assets through normal wear, ageing and foreseeable obsolescence, valued at current replacement cost.
Suppose a country has GDP of 900 billion and net primary income from abroad of 20 billion, so GNI is 920 billion. If its stock of buildings, machinery, vehicles and software loses 120 billion of value during the year, NNI is 920 − 120 = 800 billion. If the same country invested only 100 billion in new fixed assets that year, its capital stock actually shrank, a warning sign that gross figures would hide.
How NNI differs from GNI and GDP
Gross measures are published faster and revised less, so headlines use them. Net measures are conceptually better for judging welfare, because depreciation is a cost of production, not income anyone can spend. The difference matters most when:
- The capital stock is shifting towards short-lived assets. Computers and software wear out in a few years rather than decades, so economies investing heavily in them have a growing gap between GNI and NNI.
- Investment is weak, as often happens in a recession. If gross fixed capital formation (GFCF) falls below depreciation, net investment turns negative even while gross investment looks positive.
- Natural resources are being used up. Under the 2008 SNA, extracting oil or minerals is recorded as a fall in assets, not a cost, so it does not reduce NNI. The OECD's guidance on the 2025 SNA says the new standard records depletion of natural resources as a cost of production, which lowers net domestic product, net national income and net saving for resource-exporting countries.
The World Bank publishes a related indicator, adjusted net national income, which deducts both depreciation and estimates of natural-resource depletion from GNI. Net saving, the part of NNI not consumed, is what adds to a nation's net worth over time.
Measurement challenges
Depreciation is never observed directly. Statistics offices estimate it with the perpetual inventory method: they add up past investment by type of asset, assume a service life and a pattern of decline for each, and revalue the result at today's prices. Small changes in assumed service lives can shift the estimate noticeably, so NNI is less precise than GNI.
Because depreciation is valued at replacement cost, inflation in the price of machinery or buildings raises measured depreciation even if nothing physical has changed. This differs from business accounting, where depreciation is usually based on historical cost under accounting standards. For that reason the national accounts figure for an industry rarely matches the depreciation in its companies' financial statements, and the two should not be compared directly.
Comparisons across countries also need care. Converting NNI with market exchange rates ignores differences in purchasing power, so economists often use purchasing power parity (PPP) rates instead.
How Pakistan reports it
The Pakistan Bureau of Statistics (PBS) headlines gross measures: GDP, GNI and per capita GNI, on a 2015-16 base year, with per capita income for FY2024-25 shown as about Rs489,661 (about US$1,753) in the tables released with the provisional 2025-26 estimates. Its regular tables do not highlight NNI, so Pakistan's "per capita income" is a gross figure, while India's equivalent is a net figure. Readers comparing the two countries should keep that difference in mind, along with other differences between the two countries' statistical practices, such as how home remittances are treated.
The same gross-versus-net question arises in sector accounts: the flow of funds accounts record net lending or borrowing after gross investment, and the gross value added (GVA) of each industry is reported before depreciation.