Tax Devolution

Tax devolution is the foundational process of transferring a specified percentage of tax revenues collected by the Central Government to the State Governments. This mechanism corrects the structural financial imbalances in the Indian federation, where the capacity to raise revenue is heavily concentrated at the Centre, but the responsibility for public welfare expenditures lies primarily with the States. Devolution is governed by constitutional provisions and executed through the periodic recommendations of the Finance Commission.

Constitutional Architecture of Tax Devolution

The distribution, collection, and sharing of tax revenues between the Union and the States are strictly defined under Part XII of the Constitution of India.

The Divisible Pool (Article 270)

Article 270 forms the bedrock of tax devolution by establishing the “Divisible Pool.” This pool consists of all taxes and duties levied and collected by the Union Government, except for taxes mentioned in Articles 268, 269, and 269A, and specific cesses or surcharges levied under Article 271.

Evolution of the Divisible Pool via Amendments

• 80th Constitutional Amendment Act (2000): This amendment implemented the “Alternative Scheme of Devolution” recommended by the 10th Finance Commission. It fundamentally changed the system by pooling all central taxes and duties together for sharing with the states, replacing the older system where only specific taxes like Income Tax and Central Excise were shareable.
• 101st Constitutional Amendment Act (2016): This amendment introduced the Goods and Services Tax (GST) framework and added Article 269A, which dictates that Integrated GST (IGST) is levied and collected by the Centre but apportioned between the Union and States based on the recommendations of the GST Council.

Constitutional Restrictions and Exclusions

• Article 271 (Surcharges and Cesses): This article empowers Parliament to levy surcharges and cesses for exclusive Union purposes. The revenue generated from these instruments bypasses the divisible pool entirely, meaning states have zero constitutional claim over them.
• Article 274 (Presidential Assent): To safeguard state interests, any bill or amendment that varies taxes or duties in which states are financially interested, or that alters the definition of “agricultural income,” requires the prior recommendation of the President of India before introduction in Parliament.

Dual Dimensions of Devolution: Vertical vs. Horizontal

The Finance Commission utilizes a two-tier architectural framework to execute the transfer of financial resources from the Centre to the sub-national governments.

Vertical Devolution

Vertical devolution is the aggregate percentage of the net proceeds of the central divisible pool that is legally allocated to all the States collectively. The Central Government retains the remaining percentage for its own budgetary obligations.

Horizontal Devolution

Horizontal devolution is the specific mathematical formula used to distribute that collective regional share among individual states. The formula uses varying socioeconomic weights to balance the principles of equity (supporting economically weaker states) and efficiency (rewarding states with good fiscal management).

Historical Trajectory and Formulas of Tax Devolution

The parameters governing horizontal and vertical devolution have regularly shifted across different Finance Commissions to reflect the changing demographic and macroeconomic landscape of India.

Vertical Devolution Milestones

• 11th Finance Commission: Fixed the vertical devolution at 29.5%.
• 12th Finance Commission: Increased the states’ share to 30.5%.
• 13th Finance Commission: Set the vertical sharing ratio at 32%.
• 14th Finance Commission: Made a historic structural shift by increasing the vertical share from 32% to 42%, aimed at enhancing the fiscal autonomy of states and reducing tied programmatic transfers.
• 15th and 16th Finance Commissions: Adjusted the vertical share to 41%. The 1% reduction from the 14th Commission’s target was explicitly made to account for the structural reorganization of the erstwhile state of Jammu and Kashmir into the separate Union Territories of Jammu & Kashmir and Ladakh, which are funded directly by the Centre.

Comparative Analysis of Horizontal Devolution Formulas

The criteria used by the recent Finance Commissions show the shifting weights assigned to different socio-environmental metrics:

Operational Mechanics of Devolution Criteria

Income Distance

This metric measures the gap between the per capita income of a specific state and the per capita income of the top-performing state (historically Goa or Haryana). It acts as an equity metric, ensuring that states with lower resource bases receive a larger share of central revenues to help them scale up basic infrastructure.

Population Criteria and the Census Shift

The 14th Finance Commission used both 1971 population data (to reward states that controlled population growth) and 2011 data (to capture actual current demographic needs). The 15th and 16th Finance Commissions were mandated to use only the 2011 Census data. To address concerns from southern states regarding potential revenue losses due to effective family planning, the “Demographic Performance” criterion was introduced to reward states with lower Total Fertility Rates (TFR).

Forest and Ecology

This parameter measures a state’s share of dense forest cover relative to the aggregate dense forest cover across all states. It compensates states for the economic opportunities lost by maintaining ecological reserves and conserving green cover instead of clearing land for industrial exploitation.

Contribution to GDP

Introduced by the 16th Finance Commission with a 10% weight, this parameter evaluates a state’s manufacturing output and structural contribution to the national Gross Domestic Product. It balances the formula by financially rewarding highly industrialized and urbanized states that generate significant economic activity but face high migration and urban infrastructure costs.

Core Friction Points in Tax Devolution

Shrinkage of the Divisible Pool via Surcharges

While the official vertical devolution stands at 41%, states routinely argue that their actual share of total central tax collections is significantly lower. This gap occurs because the Central Government has expanded its reliance on cesses and surcharges. Since these instruments are excluded from the divisible pool under Article 271, the absolute size of the pool shared with states is compressed.

Net Proceeds vs. Gross Tax Revenue

The Finance Commission recommends the devolution percentage based on “Net Proceeds” (defined under Article 279 as gross tax revenue minus collection charges and taxes from Union Territories) rather than Gross Tax Revenue (GTR). States often contest the Central Government’s calculation of collection charges, asserting that over-reporting these administrative costs reduces the final pool available for devolution.

Advisory Nature of Recommendations

The findings and sharing formulas proposed by the Finance Commission are constitutionally advisory. While long-standing democratic convention ensures that the vertical and horizontal tax sharing percentages are accepted without modification by the Union Cabinet, the associated sector-specific and state-specific grants are occasionally modified or rejected by the executive.