State GST (SGST)

State GST (SGST) is the levy imposed by a state or Union Territory legislature on the intra-state supply of goods and services under India's dual Goods and Services Tax architecture, which took effect on 1 July 2017. Its constitutional foundation lies in the Constitution (One Hundred and First Amendment) Act, 2016, which inserted Article 246A empowering both Parliament and state legislatures to make laws on GST, and Article 279A creating the GST Council. Each state enacted its own State Goods and Services Tax Act—for instance, the Maharashtra Goods and Services Tax Act, 2017 or the Karnataka Goods and Services Tax Act, 2017—modelled on a common template approved by the GST Council. For the seven Union Territories without a legislature, the parallel levy is the Union Territory GST (UTGST) under the UTGST Act, 2017, while UTs with legislatures (Delhi, Puducherry, Jammu and Kashmir) enact their own SGST laws.

The procedural mechanics of SGST flow from the principle that an intra-state supply attracts two concurrent levies. When a supplier and the place of supply lie within the same state, the transaction is taxed under both the Central GST (CGST) and SGST, with the total GST rate split equally between the two. A good carrying an 18 percent GST rate, for example, is charged at 9 percent CGST and 9 percent SGST. The supplier collects the combined tax on a single invoice, deposits it through the GST Network (GSTN) portal, and the SGST portion accrues to the destination state's consolidated fund. Returns are filed through forms GSTR-1 (outward supplies) and GSTR-3B (summary and payment), with the system bifurcating the tax automatically into its CGST and SGST heads.

A defining feature is the input tax credit (ITC) mechanism, which governs how SGST interacts with the other levies. Under Sections 49, 49A and 49B of the CGST and SGST Acts, credit of SGST paid on inputs may be used to discharge SGST and, thereafter, Integrated GST (IGST) liability, but it cannot be cross-utilised against CGST. This firewall preserves the fiscal autonomy of the states by ensuring that revenue collected as SGST is not diverted to fund central liabilities. The classification of a supply as intra-state versus inter-state is determined by the place-of-supply rules in Chapter V of the IGST Act, 2017; an error in this determination—taxing an inter-state supply as intra-state or vice versa—is rectified under Section 77 of the CGST Act and Section 19 of the IGST Act, which permit refund of the wrongly paid tax without interest.

In practice, SGST is administered jointly by state commercial tax or GST departments and the Central Board of Indirect Taxes and Customs (CBIC), with taxpayers divided between central and state administrative control under a cross-empowerment scheme agreed by the GST Council. Maharashtra, with its large industrial base around Mumbai and Pune, consistently records among the highest SGST collections, while the GST Council—chaired by the Union Finance Minister and including every state's finance minister—meets to revise rates, as it did across more than fifty sittings between 2017 and 2024. The compensation arrangement under the GST (Compensation to States) Act, 2017 guaranteed states a 14 percent annual revenue growth for five years to 30 June 2022, funded by a compensation cess, after which several states sought an extension during deliberations in New Delhi.

SGST must be distinguished from the levies it sits beside. CGST is its central mirror image on the same intra-state transaction; IGST applies instead to inter-state supplies and imports, is collected by the Centre, and is later apportioned to the destination state, effectively substituting for SGST in cross-border movements. SGST replaced a thicket of pre-2017 state levies—state VAT, entry tax, luxury tax, entertainment tax and the central sales tax administered by states—consolidating them into one destination-based tax. Unlike the erstwhile origin-based central sales tax, GST including SGST follows the destination principle, so revenue accrues to the state where consumption occurs rather than where production happens.

Controversy has centred on fiscal federalism and revenue adequacy. The end of guaranteed compensation in 2022 left consumption-deficit and manufacturing states arguing they bear structural revenue shortfalls, since destination-based SGST favours populous consuming states over producing states such as Tamil Nadu and Gujarat. Disputes over GST Council voting weights—where the Centre holds one-third and states collectively two-thirds, with a three-fourths majority required—reached the Supreme Court, which in Union of India v. Mohit Minerals (2022) held that GST Council recommendations are persuasive, not binding, reaffirming concurrent state taxing power under Article 246A. Petroleum products, alcohol for human consumption, and electricity remain outside GST, leaving states a residual independent tax base.

For the working practitioner—whether a UPSC aspirant preparing GS Paper III, a state finance department official, or a policy analyst—SGST is the fiscal instrument through which Indian states retain meaningful taxing autonomy within a unified national market. Mastery of its interaction with CGST and IGST, the input tax credit firewall, and the destination principle is essential to understanding centre-state fiscal relations, the recurring debates of the GST Council, and the broader bargain that reconciled cooperative federalism with the constitutional consolidation of indirect taxation in 2017.