National Income Accounting Class 12: Concepts, Methods and Numericals

What National Income Accounting is about

Weightage: This chapter is part of Unit 1, National Income and Related Aggregates (Part A Introductory Macroeconomics), which carries 10 of the 80 theory marks together with Introduction.Source: CBSE Economics (030) syllabus 2026-27, Unit 1 National Income and Related Aggregates

In real board papers: asked in 2 of the 2 board papers we hold (2026 to 2026), on average 10 marks per paper. See the questions

Key concepts

Final and intermediate goods; consumption and capital goods

NCERT section 2.1

A final good is one that will not pass through any further stage of production in the year: it is bought for final consumption or for investment. An intermediate good is used up as an input by another producer in the same year (raw materials, power, fuel). Whether a good is final depends on its use, not its nature: flour bought by a household is final; flour bought by a bakery is intermediate.

Final goods are consumption goods (bought by consumers to satisfy wants) or capital goods (durable goods used in production over many years, such as machines and buildings). Consumer durables such as cars and refrigerators are consumption goods even though they last long.

Only final goods are counted in national income; counting intermediate goods as well would be double counting.

Worked example

Classify as final or intermediate: (i) a tractor bought by a farmer; (ii) milk bought by a sweet shop; (iii) milk bought by a family; (iv) electricity used by a factory. [2 marks]

Try it first, then show the solutionSolution

1. (i) Final (capital good, investment).
2. (ii) Intermediate (input for sweets).
3. (iii) Final (consumption).
4. (iv) Intermediate (input).

Answer: (i) final; (ii) intermediate; (iii) final; (iv) intermediate.

Stocks and flows; investment and depreciation

NCERT section 2.1

A stock is measured at a point of time (capital, wealth, money supply). A flow is measured over a period (income, output, investment, consumption, depreciation). National income is a flow.

Gross investment is the addition to the stock of capital during the year (new machines, buildings, and the change in inventories). Depreciation (consumption of fixed capital) is the fall in the value of capital from normal wear and tear and expected obsolescence. Net investment = gross investment − depreciation, the net addition to the capital stock.

Worked example

Suppose a firm has machines worth ₹50 lakh on 1st April, buys new machines worth ₹12 lakh in the year, and depreciation is ₹5 lakh. Find gross and net investment and the closing capital stock. Which are stocks? [3 marks]

Try it first, then show the solutionSolution

1. Gross investment = ₹12 lakh (flow). Net investment = 12 − 5 = ₹7 lakh (flow).
2. Closing capital = 50 + 7 = ₹57 lakh (stock).

Answer: Gross ₹12 lakh, net ₹7 lakh; capital of ₹50 lakh and ₹57 lakh are stocks.

Circular flow of income (two-sector model)

NCERT section 2.2

Assume only households and firms, no saving, no government and no foreign trade. Households supply factor services (land, labour, capital, entrepreneurship) to firms and receive factor payments (rent, wages, interest, profit). They spend all of this income buying the goods and services firms produce, so it returns to firms as sales revenue. There is no leakage.

The flow can be measured at three points: as expenditure on final goods (point A), as the value of final goods produced (point B) and as factor payments (point C). So:

Value of output = expenditure = income.

The upper loop is the goods market (goods one way, payments the other); the lower loop is the factor market (factor services one way, factor payments the other).

Worked example

Suppose in a two-sector economy firms pay ₹5,000 crore to households as wages, rent, interest and profit. What will be the households' expenditure on goods and the value of output, and why? [3 marks]

Try it first, then show the solutionSolution

1. Households spend all their income (no saving, no taxes, no imports).
2. So expenditure = ₹5,000 crore, which returns to firms as revenue.
3. Value of output = expenditure = income = ₹5,000 crore.

Answer: ₹5,000 crore each; the circular flow has no leakage.

Product (value added) method

NCERT section 2.2.1

Value added = value of output − intermediate consumption. Value of output = sales + change in stock. Adding value added (GVA) of all firms gives GDP at market price; subtracting depreciation gives net value added.

This avoids double counting: each firm is credited only with what it adds. Equivalently, count only the value of final goods.

Value added (₹)

Producer	Value of output	Intermediate consumption	Value added
Farmer (wheat)	2,000	0	2,000
Miller (flour)	3,200	1,500	1,700
Baker (bread)	4,500	3,200	1,300
Total			5,000

Worked example

Suppose a farmer grows wheat worth ₹2,000, sells ₹1,500 to a miller and ₹500 to households; the miller makes flour worth ₹3,200 and sells it all to a baker, who makes bread worth ₹4,500 for households. Find GDP by value added and check it by final expenditure. [3 marks]

Try it first, then show the solutionSolution

1. Value added (₹)

   Producer	Value of output	Intermediate consumption	Value added
   Farmer (wheat)	2,000	0	2,000
   Miller (flour)	3,200	1,500	1,700
   Baker (bread)	4,500	3,200	1,300
   Total			5,000

2. Check: final purchases = wheat by households ₹500 + bread ₹4,500 = ₹5,000.

Answer: GDP = ₹5,000 by both ways (not ₹9,700, which double counts).

Expenditure method

NCERT section 2.2.2

GDP at market price = expenditure on final goods and services:

$GD{P}_{MP}=C+I+G+(X-M)$

• $C$: private final consumption expenditure.
• $I$: gross domestic capital formation = gross fixed capital formation + change in stock (inventories).
• $G$: government final consumption expenditure.
• $X-M$: net exports.

Exclude spending on intermediate goods, transfer payments, purchase of second-hand goods and of financial assets (shares, bonds).

Worked example

Using the data below, calculate GDP at market price by the expenditure method. [3 marks]

Data for an economy (₹ crore)

Item	₹ crore
Compensation of employees	800
Rent	150
Interest	120
Profit	330
Mixed income of self-employed	400
Consumption of fixed capital	200
Indirect taxes	260
Subsidies	60
Net factor income from abroad	(−) 50
Private final consumption expenditure	1,450
Government final consumption expenditure	300
Gross domestic fixed capital formation	350
Change in stock	50
Exports	300
Imports	250

Try it first, then show the solutionSolution

1. GDCF = 350 + 50 = 400; net exports = 300 − 250 = 50.
2. $GD{P}_{MP}=1450+300+400+50=2200$ crore.

Answer: ₹2,200 crore.

Income method

NCERT section 2.2.3

Add the factor incomes generated within the domestic territory:

$ND{P}_{FC}=$ compensation of employees + operating surplus (rent + interest + profit) + mixed income of self-employed.

Then $GD{P}_{MP}=ND{P}_{FC}+$ depreciation $+$ net indirect taxes (indirect taxes − subsidies).

Compensation of employees includes wages and salaries in cash and kind and employers' social security contributions. Exclude transfer incomes (pensions, scholarships, gifts), capital gains, and income from sale of second-hand goods.

Worked example

Using the same data, calculate $ND{P}_{FC}$ by the income method and then $GD{P}_{MP}$; show that it equals the expenditure-method answer. [4 marks]

Try it first, then show the solutionSolution

1. Operating surplus = 150 + 120 + 330 = 600.
2. $ND{P}_{FC}=800+600+400=1800$ crore.
3. NIT = 260 − 60 = 200; $GD{P}_{MP}=1800+200+200=2200$ crore.
4. Same as the expenditure method (2,200): the methods agree.

Answer: NDPfc ₹1,800 crore; GDPmp ₹2,200 crore.

Aggregates: GDP, GNP, NDP, NNP at market price and factor cost

NCERT section 2.2.4, 2.3

Three switches connect all eight aggregates:

• Domestic → national: add net factor income from abroad (NFIA = factor income earned by residents abroad − factor income earned by non-residents in the domestic territory).
• Gross → net: subtract depreciation.
• Market price → factor cost: subtract net indirect taxes (indirect taxes − subsidies).

National income = $NN{P}_{FC}$ = $ND{P}_{FC}+NFIA$.

All eight aggregates (₹ crore)

Aggregate	How	Value
GDP at MP	Expenditure method	2,200
NDP at MP	GDPmp − depreciation	2,000
GDP at FC	GDPmp − NIT	2,000
NDP at FC	Income method	1,800
GNP at MP	GDPmp + NFIA	2,150
NNP at MP	GNPmp − depreciation	1,950
GNP at FC	GDPfc + NFIA	1,950
NNP at FC (National Income)	NDPfc + NFIA	1,750

Worked example

Using the data above, find national income ($NN{P}_{FC}$) and $GN{P}_{MP}$. [3 marks]

Try it first, then show the solutionSolution

1. $NN{P}_{FC}=ND{P}_{FC}+NFIA=1800-50=1750$ crore.
2. $GN{P}_{MP}=GD{P}_{MP}+NFIA=2200-50=2150$ crore.
3. Second route: $NN{P}_{FC}=GN{P}_{MP}-dep-NIT=2150-200-200=1750$.

Answer: National income ₹1,750 crore; GNPmp ₹2,150 crore.

Real and nominal GDP; GDP deflator

NCERT section 2.4

Nominal GDP values output at current-year prices; real GDP values it at constant (base-year) prices. A rise in real GDP means more goods and services; nominal GDP can rise from prices alone.

GDP deflator = nominal GDP ÷ real GDP (× 100 in percentage terms). It measures the change in prices of all goods and services produced, relative to the base year.

NCERT also explains the Consumer Price Index (cost of a fixed consumer basket now ÷ in base year × 100) and the Wholesale Price Index. CPI differs from the deflator because it covers only consumer goods, includes imported goods, and uses fixed weights.

Worked example

Suppose an economy produces rice and cloth. Year 1 (base): 100 units of rice at ₹10 and 50 units of cloth at ₹40. Year 2: 120 units of rice at ₹12 and 55 units of cloth at ₹50. Find nominal GDP of both years, real GDP of year 2 and the GDP deflator. [4 marks]

Try it first, then show the solutionSolution

1. Nominal GDP year 1 = 100×10 + 50×40 = ₹3,000.
2. Nominal GDP year 2 = 120×12 + 55×50 = 1,440 + 2,750 = ₹4,190.
3. Real GDP year 2 (base prices) = 120×10 + 55×40 = 1,200 + 2,200 = ₹3,400.
4. Deflator = 4,190 ÷ 3,400 × 100 = 123.24.

Answer: Nominal ₹3,000 and ₹4,190; real ₹3,400 (output up 13.33%); deflator 123.24 (prices up about 23%).

GDP and welfare

NCERT section 2.5

A higher GDP (even real GDP) may not mean greater welfare, for three reasons:

• Distribution of GDP: if the increase goes to a few, most people may be worse off.
• Non-monetary exchanges: domestic work done at home and barter in the informal sector are not counted, so GDP understates economic activity.
• Externalities: benefits or harms to others for which no payment is made. Pollution from a factory reduces welfare but is not deducted from GDP; a beautiful garden benefits neighbours without being counted.

Worked example

Suppose a country of 100 people each earned ₹20 (GDP ₹2,000). Next year 80 people earn ₹18 and 20 people earn ₹30, prices unchanged. Has GDP risen? Has welfare? [3 marks]

Try it first, then show the solutionSolution

1. New GDP = 80×18 + 20×30 = 1,440 + 600 = ₹2,040.
2. GDP rose by ₹40.
3. 80% of people are worse off (₹20 → ₹18); only 20% gained.

Answer: GDP rose but most people are worse off: distribution matters for welfare.

National Income Accounting in real life

Each concept, met in an everyday situation. Read the situation, answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Topics in this chapter

• Methods of Calculating National Income
• Real and Nominal GDP, GDP Deflator and Welfare
• Final and Intermediate Goods
• GDP, GNP, NDP and NNP at Market Price and Factor Cost

National Income Accounting: key facts

Value added

Value of output − intermediate consumption; value of output = sales + change in stock

Expenditure method

$GD{P}_{MP}=C+I+G+(X-M)$; I = gross fixed capital formation + change in stock

Income method

$ND{P}_{FC}$ = compensation of employees + operating surplus (rent + interest + profit) + mixed income

Domestic to national

National = domestic + NFIA

Gross to net

Net = gross − depreciation

Market price to factor cost

FC = MP − (indirect taxes − subsidies)

National income

$NN{P}_{FC}=ND{P}_{FC}+NFIA$

GDP deflator

Nominal GDP ÷ real GDP × 100

Net investment

Gross investment − depreciation

National Income Accounting: diagrams to practise

Practise each one on paper: draw it from the checklist, then tick off every label.

How the board asks National Income Accounting

The question patterns to expect, and the method that works for each.

Tricks to remember National Income Accounting

Short memory aids. Say each one aloud once, then use it on a question the same day.

• Three switches

  National = domestic + NFIA; net = gross − depreciation; FC = MP − NIT.

  Use it when: Converting any aggregate to another.

• C + I + G + (X − M)

  Consumers, investors, government, foreigners.

  Use it when: Expenditure method.

• COE + OS + MI

  Compensation, operating surplus (rent, interest, profit), mixed income.

  Use it when: Income method.

• D-N-E for welfare

  Distribution, Non-monetary exchanges, Externalities.

  Use it when: GDP and welfare.

National Income Accounting: board-level solved questions

Ordered from board level to HOTS. Cover the solution, write your own, then compare step by step.

Case-study practice (Section E style)

Read the situation, then answer every part. In the board paper this is a 4-mark question split into 1 + 1 + 2 marks.

Where the marks are

How a typical answer is split into step marks. Show every step: a right final answer alone rarely earns full marks.

Where students lose marks in National Income Accounting

The slips examiners see most often, and what to write instead.

• ✗Mistake: Adding the output of all firms

  Forgetting intermediate consumption.

  Wrong working

  GDP = 2,000 + 3,200 + 4,500 = 9,700

  Right working

  GDP = 2,000 + 1,700 + 1,300 = 5,000

  ✓Do this: Use value added or final goods only.

  Usually costs: 2-3 marks.

• ✗Mistake: Subtracting NFIA to go from domestic to national

  Sign confusion.

  ✓Do this: National = domestic + NFIA (NFIA may itself be negative).

  Usually costs: 1 mark.

• ✗Mistake: Including transfer payments or purchase of shares

  They are payments.

  ✓Do this: Only factor incomes and final expenditure on current output count.

  Usually costs: 1 mark per item.

• ✗Mistake: Using current prices for real GDP

  Not switching to base-year prices.

  ✓Do this: Real GDP = current quantities × base-year prices.

  Usually costs: 1-2 marks.

• ✗Mistake: Treating subsidies as added to market price

  Reversing NIT.

  ✓Do this: FC = MP − indirect taxes + subsidies.

  Usually costs: 1 mark.

NCERT exercise guide: National Income Accounting

What each exercise in the NCERT chapter tests, how to approach it, and a question of the same kind solved step by step. Questions here are written in our own words.

National Income Accounting: previous year questions

• Asked in 2 of the 2 board papers we hold (2026 to 2026), on average 10 marks per paper; 13 questions in all, counting OR alternatives. In 4 of 4 sample papers.

Counted from the real papers on our previous year papers page, not estimated. Average marks are over every board paper we hold, with an OR pair counted once. Chapter tags are ours.

Solved board questions from National Income Accounting

Real questions from recent papers. Try each one first, then open our step-by-step solution with marks per step.

Every National Income Accounting question, by year

Practice questions on National Income Accounting

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

1. Q1 · 1 mark · MCQBoard level

   Which of the following is a final good?
   (a) Cotton bought by a textile mill
   (b) A machine bought by a factory
   (c) Steel bought by a car maker
   (d) Electricity used by a shop

   Hint

   Capital goods are final.

   Answer

   (b)

2. Q2 · 1 mark · MCQBoard level

   Net indirect taxes equal:
   (a) indirect taxes + subsidies
   (b) indirect taxes − subsidies
   (c) direct taxes − subsidies
   (d) subsidies − indirect taxes

   Hint

   Market price minus factor cost.

   Answer

   (b)

3. Q3 · 3 marks · Short answerBoard level

   Distinguish between stock and flow with two examples each.

   Hint

   Point of time vs period.

   Answer

   Stock: measured at a point of time (capital, money supply). Flow: measured over a period (income, investment). A flow changes a stock.

4. Q4 · 4 marks · Short answerBoard level

   Explain the circular flow of income in a two-sector economy.

   Hint

   Real and money flows.

   Answer

   Households supply factor services to firms and receive factor payments; they spend all income on goods from firms, which returns as revenue. Real flows (services, goods) and money flows (payments, expenditure) move in opposite directions; with no leakages, output = expenditure = income.

5. Q5 · 3 marks · Short answerHarder board level

   Suppose $GD{P}_{FC}$ is ₹10,000 crore, depreciation ₹800 crore, indirect taxes ₹1,200 crore, subsidies ₹200 crore and NFIA ₹−300 crore. Find $NN{P}_{MP}$ and $NN{P}_{FC}$.

   Hint

   Use the three switches.

   Answer

   NNPfc = 10,000 − 800 − 300 = ₹8,900 crore. NNPmp = 8,900 + (1,200 − 200) = ₹9,900 crore. Check: GDPmp = 11,000; GNPmp = 10,700; NNPmp = 10,700 − 800 = 9,900.

6. Q6 · 3 marks · Short answerHarder board level

   Suppose compensation of employees is ₹600 crore, operating surplus ₹400 crore, mixed income ₹200 crore, depreciation ₹100 crore, net indirect taxes ₹150 crore and NFIA ₹50 crore. Find $GN{P}_{MP}$.

   Hint

   NDPfc first.

   Answer

   NDPfc = 1,200; GDPmp = 1,200 + 100 + 150 = 1,450; GNPmp = 1,500 crore.

7. Q7 · 3 marks · Short answerHarder board level

   Nominal GDP is ₹4,800 crore and real GDP ₹4,000 crore. Calculate the GDP deflator and interpret it.

   Hint

   Nominal ÷ real × 100.

   Answer

   Deflator = 120: prices of goods produced are 20% higher than in the base year.

8. Q8 · 1 mark · Assertion-reasonHOTS / competency

   Assertion (A): Real GDP is a better measure of economic growth than nominal GDP.
   Reason (R): Real GDP removes the effect of price changes by valuing output at base-year prices.
   (a) Both true and R explains A (b) Both true, R does not explain A (c) A true, R false (d) A false, R true

   Hint

   Volume vs value.

   Answer

   (a)

9. Q9 · 3 marks · Short answerHOTS / competency

   Suppose the government gives ₹10,000 crore as unemployment allowance and spends ₹10,000 crore building roads. Which adds to GDP and why?

   Hint

   Transfer vs final expenditure.

   Answer

   Road building is final expenditure on newly produced goods (capital formation): it adds to GDP. Unemployment allowance is a transfer payment with no production in return: it is excluded.

10. Q10 · 3 marks · Short answerHarder board level

    Explain how CPI differs from the GDP deflator (any three).

    Hint

    Coverage, imports, weights.

    Answer

    CPI covers only goods bought by consumers, the deflator all goods produced; CPI includes imported goods, the deflator does not; CPI uses fixed weights, the deflator's weights change with production.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1. 1.What is national income?Show answer

   Net national product at factor cost ($NN{P}_{FC}$).

2. 2.What is NFIA?Show answer

   Factor income earned by residents abroad minus factor income earned by non-residents in the domestic territory.

3. 3.What is value of output?Show answer

   Sales plus change in stock.

4. 4.What is operating surplus?Show answer

   Rent + interest + profit.

5. 5.What is the GDP deflator formula?Show answer

   Nominal GDP ÷ real GDP × 100.

6. 6.Is imputed rent of owner-occupied houses included?Show answer

   Yes.

7. 7.What are the three reasons GDP is not a perfect welfare index?Show answer

   Distribution, non-monetary exchanges and externalities.

8. 8.What is net investment?Show answer

   Gross investment minus depreciation.

Quick revision checklist

The night before the exam: can you do each of these without looking?

• ☐Can you classify goods as final or intermediate by use?
• ☐Can you separate stocks from flows?
• ☐Can you explain the two-sector circular flow?
• ☐Can you compute value added with change in stock?
• ☐Can you find GDPmp by the expenditure method?
• ☐Can you find NDPfc by the income method?
• ☐Can you convert between all eight aggregates?
• ☐Can you decide inclusion or exclusion of transfers, shares and second-hand goods?
• ☐Can you compute real GDP and the deflator?
• ☐Can you explain three limits of GDP as a welfare index?

National Income Accounting: frequently asked questions