Corrective and special-purpose taxes

Detail

1. Why "corrective" taxes exist

• Most taxes exist to raise revenue. A corrective tax exists mainly to change behaviour. Revenue is a side benefit.
• Externality: a cost or benefit that falls on people outside a market deal. Neither the buyer nor the seller pays for it.

• Negative externality: a cost pushed onto others. Examples are smoke, river pollution and traffic jams.

• Private cost vs social cost:

• Private cost: what the producer pays, such as wages, raw material and power.
• Social cost = private cost + external cost (the damage done to others).

• When the external cost is not charged, the good looks cheaper than it really is. So too much of it is produced.

• NCERT link (Class 12, National Income Accounting): a refinery pollutes a river and harms fishermen downstream. The refinery does not pay for the harm, and GDP does not subtract it. This is an unpriced externality, and a Pigouvian tax tries to fix exactly this.

2. Pigouvian tax

• Pigouvian tax: a tax on an activity that creates a negative externality. It is named after A.C. Pigou, who described it in The Economics of Welfare (1920).
• The ideal rate: tax per unit = marginal external cost (MEC). MEC is the extra damage caused by one more unit.
• Formula: Private cost + Pigouvian tax = Social cost, where the tax = MEC.

• The firm now "feels" the damage it causes, so it cuts output to the level that is best for society.

• Worked example:

• A steel unit's private cost is ₹100 per tonne. Its smoke causes ₹20 per tonne of health damage (the MEC).
• The government puts a tax of ₹20 per tonne on it.

• The firm's cost becomes ₹120, which equals the social cost. Some buyers now buy less steel or switch to cleaner steel, so pollution falls.

• Double dividend (two gains from one tax):

• Dividend 1: less pollution.

• Dividend 2: new revenue. It can be used to cut other, more distorting taxes, such as taxes on labour income that discourage work.

• Practical problem: MEC is hard to measure. Governments usually guess a rate and then adjust it.

3. Carbon tax

• Carbon tax: a Pigouvian tax on the carbon content of fuels or on emissions of CO₂. The more carbon a fuel has, the higher the tax.
• Explicit carbon tax: a tax that is openly called a carbon tax and levied per tonne of CO₂. Examples are Sweden and Canada.
• Implicit carbon tax: a tax that is not called a carbon tax but still raises the price of fossil fuels. India's high excise on petrol and diesel works as one.
• India's coal cess (timeline):
• 2010: the Clean Energy Cess began at ₹50/tonne on coal.
• 2016: it had risen to ₹400/tonne.
• 2017: when GST came in, it was subsumed (merged) into the GST compensation cess. Coal paid 5% GST + ₹400/tonne compensation cess [2].

• 2025: the 56th GST Council recommended removing the compensation cess on coal and raising GST on coal from 5% to 18% [2].

• Why the 2025 change mattered [2]:

• Lower overall tax on final users: the GST rate went up, but the fixed ₹400/tonne cess went away. For most coal, the total tax burden fell.
• Fixes the inverted duty structure: this is when inputs are taxed more than the output, so tax credits pile up unused. Coal producers paid 18% GST on services and machines but charged only 5% on coal. At 18%, they can now use those credits, which frees up their cash.

• Level playing field: the flat per-tonne cess hurt low-grade domestic coal more than imported coal. Removing it helps Indian coal compete and cuts needless imports.

• Exam angle: coal lost its separate "green" cess in 2025. Some carbon pricing remains through excise on fuels and through carbon markets.

• Covered elsewhere: carbon tax vs cap-and-trade (a system where the government caps total emissions and firms trade permits), India's Carbon Credit Trading Scheme and the EU's CBAM are in the Environment and Sustainable Development and International Trade Policy notes.

4. Sin tax

• Sin tax: a higher tax on harmful or demerit goods, such as tobacco, alcohol and sugary drinks. It aims to make people choose healthier options.

• Demerit good: a good that harms the user, and often others too, more than the user realises.

• India's structure:

• 40% GST rate (the special "sin/luxury" slab) on tobacco and aerated drinks.
• Tobacco also carries central excise.

• Pan masala carries the HSNS cess.

• WHO benchmark:

• WHO recommends that tax make up at least 75% of the retail price of tobacco. Under the MPOWER package, "R" = Raise taxes on tobacco. This is linked to WHO FCTC Article 6 (price and tax measures) [3].
• Global position (2024): only 1.2 billion people live in countries where tobacco taxes are above 75% of the retail price [3].
• Tax share of a cigarette pack's price (2024): 43.5% in low-income countries and 67.3% in high-income countries [3].

• Between 2014 and 2024, cigarettes became less affordable in only 46 countries [3]. WHO says taxes must be raised "significantly and periodically" so that they keep pace with rising incomes [3].

• Worked example (why the tax share matters):

• A pack sells for ₹100. The WHO benchmark says at least ₹75 of that should be tax.
• If the tax is only ₹50, the pack is "cheap" by WHO standards, and incomes rising over time make it even more affordable.

5. Windfall tax

• Windfall tax: a special, often one-time tax on unusually large profits caused by an outside shock rather than by the firm's own effort. An oil-price spike is the classic case.

• The logic: the firm did nothing extra to earn this profit, so taxing it hurts incentives less.

• India – SAED:

• A Special Additional Excise Duty (SAED) was levied on domestic crude oil and on exports of petrol, diesel and ATF (aviation turbine fuel).
• It began in July 2022, after oil prices jumped during the Russia–Ukraine war, and was abolished in December 2024.

• The rate was reset every fortnight in line with global prices.

• Update (2026): during a new global oil shock, the government again notified SAED / Road and Infrastructure Cess (RIC) export levies on diesel and ATF, revised each fortnight. Examples are the fortnights beginning 1 May 2026 and 1 June 2026 [4][5].

• At the same time, it cut excise duty on petrol and diesel to protect consumers and oil marketing companies from the price shock [6].

• Logic of this mix: tax the export windfall, so that fuel stays at home, and cut the domestic tax, so that pump prices stay under control.

• UK: the Energy Profits Levy (2022) on oil and gas companies' extra profits.

• Worked example:
• A refiner normally earns ₹5,000 per tonne on exports. After a price spike, it earns ₹15,000.
• A windfall levy of ₹6,000 per tonne takes part of the ₹10,000 extra gain. It leaves the normal profit untouched.

6. Tobin tax

• Tobin tax: a small tax on currency (foreign exchange) transactions, proposed by James Tobin in 1972.

• Its aim is to curb short-term speculative flows, which Tobin called "throw sand in the wheels" of fast-moving money.

• How it works: a tiny rate hurts traders who buy and sell many times a day, but hardly touches long-term investors.

• Worked example (rate assumed 0.1%):
• A speculator converts ₹1 crore into dollars and back every day. That is a tax of ₹20,000 per round trip (₹10,000 on each leg).
• Over 250 trading days, this adds up to about ₹50 lakh, which kills most thin profits.

• A long-term investor who makes one round trip a year pays only ₹20,000.

• Financial transaction tax (FTT): a wider version on trades in shares, bonds and derivatives. The EU has proposed one.

• India's FTT-like taxes:
• Securities Transaction Tax (STT, 2004): a tax on buying and selling shares and derivatives on stock exchanges.
• Commodities Transaction Tax (CTT, 2013): a tax on trades in commodity derivatives.

7. Design issues (common to all corrective taxes)

• Behaviour vs revenue: the better the tax works, the less revenue it brings.
• The cigarette tax rises → people smoke less → the tax base shrinks → revenue falls.

• So a sin tax should be judged on health outcomes, not on revenue alone.

• Pass-through: firms shift the tax to consumers through higher prices. This is tax incidence (who finally bears the tax) again.

• When demand is price-inelastic (it barely changes when the price changes), as with fuel and addictive goods, most of the tax falls on buyers.

• Regressivity: a regressive tax takes a larger share of a poor person's income than of a rich person's.

• Fuel and tobacco form a bigger share of poor households' budgets, so these taxes hit them harder.

• Remedy: return the revenue through cash transfers or subsidies to the poor.

• Evasion and smuggling: very high sin taxes create a price gap → illicit and smuggled cigarettes → loss of both revenue and health goals.

• Capital flight: if one country taxes financial transactions, trading can move to a cheaper market abroad. This is why Tobin and FTT ideas need global coordination.
• Policy uncertainty: rates reset every fortnight (as with SAED) protect revenue, but they make investment planning harder for oil firms.

Prelims Hooks

• Pigouvian tax = A.C. Pigou, The Economics of Welfare (1920). The ideal rate equals the marginal external cost, so private cost equals social cost.
• Double dividend = lower pollution + revenue that can be used to cut other, more distorting taxes.
• Explicit carbon tax: Sweden, Canada. Implicit carbon tax: India's fuel excise.
• Clean Energy Cess on coal: ₹50/t (2010) → ₹400/t (2016) → merged into the GST compensation cess (2017) → removed by the 56th GST Council in 2025, with GST on coal raised from 5% to 18% [2].
• Trap: raising GST on coal to 18% lowered the overall tax burden on consumers, because the ₹400/t cess went away [2].
• WHO: tobacco tax should be ≥75% of retail price. MPOWER "R" = Raise taxes. Linked to FCTC Article 6 [3].
• 40% GST slab: tobacco and aerated drinks. HSNS cess: pan masala.
• India's windfall tax = SAED, from July 2022 to December 2024. It was reimposed as SAED/RIC export levies on diesel and ATF in 2026 [4][5]. The UK equivalent is the Energy Profits Levy (2022).
• Tobin tax = James Tobin (1972), a tax on currency transactions. India's FTT-like taxes are STT (2004) and CTT (2013).
• Trap: a Tobin tax targets short-term speculation, not long-term FDI.

Mains Points

• Carbon pricing in India:
• India prices carbon implicitly (fuel excise, and the coal cess until 2025) rather than through an explicit carbon tax.
• Removing the coal cess in 2025 corrected an inverted duty structure and helped domestic coal [2]. But it also weakened a direct price signal against coal.

• The trade-off is between energy security and affordability on one side and climate goals on the other. Carbon markets (CCTS) and CBAM pressure now carry more of that burden.

• Sin taxes: health vs revenue:

• Revenue that falls as consumption falls is a sign of success, not failure.
• India's pack-price tax share is still below WHO's 75% benchmark [3], but very high rates feed smuggling.

• Middle path: steady, predictable increases indexed to income (WHO's "significantly and periodically" [3]), plus stronger enforcement against illicit trade.

• Windfall taxes:

• They are fair and cause little distortion when a shock is truly temporary.
• They also raise revenue and keep domestic supply stable, as with export levies on diesel and ATF in 2022 and 2026 [4][5].

• But frequent, unpredictable resets hurt investor confidence in exploration and refining. A clear, rule-based trigger and a sunset clause make them better.

• Tobin tax and FTTs:

• They can reduce volatile "hot money" and raise revenue (STT, CTT).
• They need international coordination, otherwise trading moves to cheaper markets (capital flight). This is the same logic as the OECD's global minimum tax.