GST On EV Charging: HSN/SAC Codes And Invoicing Rules CPOs Get Wrong

GST on EV charging is one of the few compliance areas where the headline number and the number that actually belongs on your invoice are not the same thing. Most charge point operators (CPOs) know that electric vehicles and EV chargers carry a concessional 5% GST rate — that’s been true since August 2019. Fewer know that the service of charging a vehicle’s battery — the actual revenue line CPOs bill for — has been classified separately by tax authorities and taxed at 18%. Get that distinction wrong in your HSN/SAC configuration and you’re either under-collecting GST you legally owe, or filing returns your billing software can’t defend in an audit.

This is written for two segments that hit this problem from different sides: CPOs and eMSPs issuing tax invoices directly for charging sessions, and fuel retailers/oil & gas operators billing EV charging alongside petrol and diesel sales at the same forecourt — where two entirely different tax regimes now sit on one till. Both need their billing software to apply the correct code automatically, not leave it to whoever configured the price list.

GST On EV Charging In India: The Rates That Actually Apply

There are three separate GST treatments layered into a single EV charging transaction, and conflating them is the single biggest source of invoicing errors on CPO billing platforms.

EVs And EV Chargers: The 5% Rate

At its 36th meeting on 27 July 2019, the GST Council cut GST on electric vehicles from 12% to 5%, and on chargers or charging stations for EVs from 18% to 5%, effective 1 August 2019 — a move the government announced through the Press Information Bureau. This 5% rate applies to the hardware — the AC/DC charging unit itself, classified under HSN 8504 (specifically 85044030, static converters/battery chargers for electrically operated vehicles) — and to the vehicle. It does not, by itself, tell you what to charge GST at when you invoice a driver or fleet for a charging session.

Electricity As A Commodity: Exempt, Not A Blanket Cover

Electrical energy, classified under HSN 2716, has been exempt from GST since Notification No. 2/2017-Central Tax (Rate) — this is why your electricity bill from the DISCOM carries no GST line. It’s also why some billing teams assume EV charging revenue should be exempt too, on the theory that “we’re just reselling electricity.” That assumption is where most of the invoicing mistakes in this article start.

The Charging Service Itself: Why Rulings Say 18%, Not 5%

In 2018, the Ministry of Power clarified that operating a charging station is a delicensed service activity under the Electricity Act, 2003 — a CPO isn’t transmitting, distributing or trading electricity, so no distribution licence is required. Tax authorities have since built on that “service” framing for GST purposes, but landed on a different rate than most CPOs expect. In In re Chamundeshwari Electricity Supply Corporation Ltd (Order No. KAR ADRG 24/2023, dated 13 July 2023), the Karnataka Authority for Advance Ruling held that the entire value of an EV battery-charging transaction — the energy plus the service of delivering it — is a composite supply of service classifiable under SAC 998714 (“maintenance and repair services of transport machinery and equipment”), taxable at 18%, with input tax credit available on the CPO’s own inputs. That’s the rate most billing engines miss when they inherit the “EVs are 5% GST” headline and apply it uniformly to session revenue.

The Correct HSN And SAC Codes For CPO Tax Invoices

A single CPO invoice can legitimately touch four different codes depending on what’s actually being sold. Here’s the reference table most billing configurations are missing.

Why You (Usually) Can’t Split Electricity From The Service Charge

The instinctive workaround — bill the electricity units at the exempt HSN 2716 rate and the “service fee” separately at 18% — is exactly what the Karnataka AAR rejected. The ruling treats the energy delivered and the service of delivering it (through owned or leased charging infrastructure, with monitoring, access control and billing layered on) as one composite supply, taxed at the rate of its predominant element: the service. Bifurcating the invoice to shrink the taxable base is the pattern most likely to draw a notice, not a fix for one.

Common Invoicing Mistakes That Trigger GST Notices

Three patterns account for most of the GST exposure we see in CPO and forecourt billing setups.

Per-Session Vs. Per-kWh Billing: Same Tax Answer, Different Trap

Switching from a flat per-session fee to per-kWh metering doesn’t change what’s being classified — it’s still a charging service under SAC 998714 at 18% either way. The trap is assuming a pricing-model change is also a tax-treatment change: teams sometimes re-tag per-kWh line items as an “electricity sale,” precisely because it’s billed by the unit, and apply HSN 2716’s exemption to it. Classification follows the nature of the supply, not the billing unit.

Mixed Fuel + Charging Invoices At Forecourts

Petrol and diesel sit outside the GST net entirely — they’re taxed through state VAT and central excise duty, a completely separate regime. EV charging is a GST-taxable service. A fuel retailer running both from one forecourt cannot legally fold a charging session and a fuel fill-up into one consolidated tax invoice; the two need separate invoice sequences, or at minimum clearly separated line items with distinct tax treatments, from the same point of sale. This is one of the most common gaps we see when a forecourt EV energy hub bolts a charging POS onto an existing fuel-billing system that was never built to run two tax regimes side by side.

State-Wise CGST/SGST Vs. IGST Slip-Ups Across Multi-Site Networks

A CPO operating charging sites across multiple states needs GST registration and invoicing configured per state — each site typically bills CGST+SGST for in-state supply — not a single home-state GSTIN applied network-wide. Networks that scaled fast on one billing configuration often discover this only when a state tax department cross-checks GSTIN-to-site mapping during a routine audit, well after the exposure has compounded across hundreds of invoices.

How A CPO Billing Engine Should Auto-Apply The Right Tax Treatment

None of this is a one-time setup task — it’s a configuration layer your billing software should carry automatically as you add sites, states and revenue types.

Map Tax Treatment To Revenue Stream, Not Just Site

Session fees, energy charges, idle/overstay fees, subscription revenue and hardware sales each need their own item-master entry with the correct HSN/SAC pre-assigned — not a single tax rate applied at the site or invoice level. A unified payment and billing platform should let a CPO define this mapping once per revenue type and have it apply consistently across every site and every driver-facing payment method, so the correct code doesn’t depend on which ops person configured that site’s price list.

Separate Forecourt Fuel Ledgers From Charging Ledgers

For oil & gas operators, the fix is structural: charging revenue and fuel revenue need separate ledgers, separate invoice sequences and separate tax logic feeding into the same forecourt POS, even if the driver experience feels like one transaction. Retrofitting this after a network has scaled costs far more in reconciliation time than designing for it when a fuel retailer adds EV charging to its first pilot sites.

Keep An Audit Trail That Survives A GST Notice

Every charging invoice should carry GSTIN validation, the correct place-of-supply state, and — for any CPO that has crossed ₹5 crore in aggregate turnover — a valid e-invoice IRN, mandatory for GST-taxable supplies since 1 August 2023. Billing and tax configuration like this is typically one module inside a broader EV charging management software stack rather than a bolt-on spreadsheet, precisely because it needs to stay in sync with session data, site metadata and driver records that already live in the same system.

Sources: Press Information Bureau — GST Rate Cut On EVs & Chargers | Press Information Bureau — Charging Stations For Electric Vehicles | Business Standard — Karnataka AAR On EV Battery Charging GST | CBIC — GST Goods & Services Rates