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A post-possession residential complex managed by an RWA or CHS collects monthly Common Area Maintenance charges from each unit — the exemption under Notification 12/2017-CTR Sl. No. 77 applies up to ₹7,500 per month per member, but the moment a member's CAM crosses ₹7,500 GST at 18% applies on the full amount (not just the excess) per Circular 109/28/2019-GST, and if the RWA's aggregate turnover exceeds ₹20 lakh under Section 22 registration is triggered independently — creating a mixed-tariff complex where some units are exempt, others fully taxable, and taxable supply heads (transfer charges, guest charges, late interest) run parallel to the CAM exemption test.
Maintain a per-unit CAM register with tariff, monthly CAM, and threshold flag; evaluate the ₹7,500 test at the unit level every month and classify as exempt or taxable-18%; aggregate to RWA-level turnover for the Section 22 ₹20 lakh registration test; segregate transfer charges, guest charges, late-payment interest and non-CAM services as separately taxable heads; apply Rule 42 ITC apportionment where taxable and exempt output coexist; reconcile per-unit invoice register to aggregate GSTR-1 exempt-vs-taxable split monthly.
Unit master keyed by flat/apartment number with owner, tariff category, monthly CAM amount, threshold flag (above/below ₹7,500); GST registration status of RWA (registered from month X); Notification 12/2017-CTR Sl. 77 exemption logic (per-member per-month ₹7,500 cliff, full-amount taxation above); Circular 109/28/2019-GST reference in the audit trail; Rule 42 ITC apportionment ratio calculator; separately-taxable head classifier for transfer/guest/interest charges; GSTR-1 exempt-vs-taxable HSN split for reporting.
A monthly per-unit CAM invoice register with exempt or taxable flag, GST amount computed at 18% for units above ₹7,500, transfer/guest/interest heads separately taxed; aggregate RWA-level GSTR-1 filing pack with exempt supply and taxable supply split by HSN; Rule 42 ITC apportionment worksheet with taxable-turnover-ratio and reversed ITC in GSTR-3B; audit-ready evidence of threshold-management with tariff-revision alerts before crossings; annual GSTR-9C reconciliation tying CAM register total to GSTR-1 reported turnover.
A luxury residential tower under a Bengaluru RWA opens Q1 FY 2026-27 with 400 apartments — 340 units on the standard ₹12,000/month CAM tariff and 60 penthouse units on ₹18,500/month. The RWA treasurer pulls the GSTR-1 for the first month post-tariff-revision and reads a ₹32.4 lakh 18% GST liability against a total CAM billed value of ₹58.8 lakh. The AGM had voted a ₹200/month CAM revision six months earlier, thinking a modest hike would leave individual receipts under the ₹7,500 line — the treasurer, working from CBIC Circular 109/28/2019-GST, corrects the room: the whole tower crossed the ₹7,500 line years ago, and the exempt-versus-taxable question has no ambiguity. CAM common area maintenance GST 7500 threshold India is a cliff, not a slab, and reconciliation must treat every unit as an independent threshold-management case.
Quick reference
| Item | Value |
|---|---|
| Governing notification | Notification 12/2017-Central Tax (Rate), Sl. No. 77 |
| Per-member exemption | Up to ₹7,500 per month per member — exempt |
| Above threshold | 18% GST on the full amount (not just excess) — Circular 109/28/2019-GST |
| Registration threshold | Aggregate turnover ₹20 lakh — Section 22 CGST Act |
| Post-CC transition | Schedule III Entry 5 — developer exits, RWA takes over CAM |
| Separately taxable heads | Transfer charges, guest charges, late-payment interest, non-CAM services |
| ITC apportionment | Rule 42, CGST Rules — proportional to taxable output |
| Return | GSTR-1 (exempt/taxable HSN split) + GSTR-3B + annual GSTR-9C |
| SAC code (services) | 9995 — Services provided by membership organisations |
The threshold in one paragraph
Notification 12/2017-CTR Sl. No. 77 exempts reimbursement of charges or share of contribution from a member of an unincorporated body (RWA, CHS, apartment owners’ association) up to ₹7,500 per month per member for common goods and services — housekeeping, security, lift maintenance, DG, water, common electricity, gardening, clubhouse operations. Below the ₹7,500 line, the supply is exempt. On the ₹7,500 line, the supply is exempt (the notification says “up to”). Above the line — even by ₹1 — the entire monthly CAM is taxable at 18% GST. This is not a slab where only the excess above ₹7,500 is taxed. CBIC Circular 109/28/2019-GST closed this interpretation in July 2019 and is the citation every auditor will reach for.
What the CAM landscape looks like in India — safe illustrative developer brands
Post-Completion-Certificate residential complexes across India split roughly into three CAM bands. Illustrative developer brands (all publicly listed) to map the pattern without naming any Terra Insight customer:
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Below-₹7,500 band — the exempt majority. Volume mid-market residential — 900–1,500 unit complexes in Chennai, Pune, Hyderabad from Sobha, Puravankara and Brigade Enterprises typically operate CAM in the ₹4,500–₹7,200/month range depending on tower age, amenity load, and DG diesel usage. Every unit in these complexes is exempt under Sl. 77. GSTR-1 shows nil taxable CAM. GST registration may or may not be triggered depending on whether the aggregate turnover crosses ₹20 lakh (see Section 22 test below) — a 1,200-unit complex at ₹6,000/month billed to owners has ₹8.64 crore/year in exempt CAM, so it is registered but reports exempt supply.
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Around-₹7,500 band — the threshold zone. Mid-premium residential — 400–800 unit complexes at Godrej Properties or Kolte-Patil in Pune, Bengaluru, Mumbai — often sit at ₹6,800–₹7,400 today with tariff-revision pressure from rising security wages and lift AMC costs. This band is the most operationally dangerous. A ₹300/month tariff hike takes a member from full exemption to full taxation, and the RWA committee frequently underestimates the discontinuity. Reconciliation must forecast the crossing before the AGM votes the revision.
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Above-₹7,500 band — the fully-taxable premium. Luxury towers — DLF’s Camellias-tier in Gurgaon, Oberoi Realty’s Sky-tier in Mumbai, Lodha’s Altamount-tier — typically bill CAM in the ₹10,000–₹35,000/month range. Every unit is fully taxable at 18% GST on the whole amount. GSTR-1 shows the full monthly CAM run-rate as taxable outward supply under SAC 9995.
Mixed-tariff complexes cut across all three bands within the same RWA — a Prestige Estates mixed-density project might operate towers at ₹6,900/month (exempt) alongside a penthouse block at ₹14,500/month (taxable) — and reconciliation must handle both invoice lines within the same GSTR-1 filing pack for the same reporting month.
The regulatory overlay
Notification 12/2017-CTR Sl. No. 77. The exemption. Applies to services by an unincorporated body to its own members by way of reimbursement of charges or share of contribution up to ₹7,500 per month per member for sourcing goods or services from a third person for common use.
CBIC Circular 109/28/2019-GST dated 22 July 2019. The interpretation. Where CAM exceeds ₹7,500 per month per member, GST is chargeable on the entire amount and not just on the differential. This is the cliff-not-slab clarification and the citation the auditor will insist on in every GSTR-9C dispute.
CBIC Circular 130/49/2019-GST. The registration overlay. Aggregate turnover of the RWA above ₹20 lakh in a financial year triggers GST registration under Section 22 CGST — irrespective of whether every individual member’s contribution is under ₹7,500. A 1,500-unit complex billing ₹5,000/month CAM (all below threshold, all exempt supply) still has ₹9 crore/year aggregate turnover and is required to register — the CAM supply remains exempt in GSTR-1, but the RWA becomes a registered person and must file returns.
Section 22, CGST Act. The registration threshold — ₹20 lakh aggregate turnover in a financial year, ₹10 lakh in special-category states. Aggregate turnover includes exempt supply for the registration test.
Section 17(2), CGST Act read with Rule 42, CGST Rules. ITC apportionment. Where taxable and exempt output coexist, ITC on common inputs is reversed in proportion to exempt turnover.
Schedule III Entry 5, CGST Act. The handover point. Sale of building after issue of Completion Certificate is outside the scope of supply — this is the moment developer-side maintenance ends and RWA-side CAM begins. Reconciliation must date the transition per unit to avoid double-invoicing during the developer-to-RWA handover window.
A worked example — illustrative numbers
A mixed-density residential project managed by a single RWA at Q1 FY 2026-27:
Tower A — mid-market residential, 800 units at ₹6,800/month CAM. All 800 units below ₹7,500 threshold — fully exempt under Sl. 77. Monthly exempt supply: 800 × ₹6,800 = ₹54.4 lakh/month. Annualised: ₹6.528 crore exempt turnover.
Tower B — mid-premium, 300 units at ₹7,400/month CAM. Below threshold — fully exempt. Monthly exempt supply: 300 × ₹7,400 = ₹22.2 lakh/month. Annualised: ₹2.664 crore exempt turnover. This tower is the threshold-management case — a ₹150 tariff hike would flip the whole tower to fully taxable at 18%.
Tower C — luxury penthouse block, 100 units at ₹12,500/month CAM. Above threshold — full 18% GST on ₹12,500. Monthly taxable supply: 100 × ₹12,500 = ₹12.5 lakh/month. Monthly GST at 18%: ₹2.25 lakh. Annualised: ₹1.5 crore taxable turnover, ₹27 lakh output GST.
Separately taxable heads (whole RWA). Transfer charges: ₹8 lakh/year (from ~20 property transfers × ₹40,000 each). Guest charges + community-hall bookings: ₹4 lakh/year. Late-payment interest on delayed CAM: ₹6 lakh/year. Total separately-taxable non-CAM heads: ₹18 lakh/year → GST at 18% = ₹3.24 lakh.
Aggregate turnover for Section 22 test. ₹6.528 Cr + ₹2.664 Cr + ₹1.5 Cr + ₹0.18 Cr = ₹10.87 Cr — well above the ₹20 lakh registration threshold. The RWA is a registered person.
Rule 42 ITC apportionment. Taxable turnover ratio = ₹1.68 Cr / ₹10.87 Cr = 15.5%. On common inputs (housekeeping ₹80 lakh/year, security ₹1.2 Cr/year, DG diesel ₹40 lakh/year, lift AMC ₹18 lakh/year) with 18% GST on inputs totalling roughly ₹46 lakh input GST/year, only 15.5% (₹7.1 lakh) is available as ITC and 84.5% (₹38.9 lakh) must be reversed in GSTR-3B.
Monthly GSTR-1 filing pack. Exempt supply: ₹76.6 lakh (Towers A + B CAM). Taxable supply at 18%: ₹12.5 lakh CAM (Tower C) + ₹1.5 lakh non-CAM heads = ₹14 lakh. Output GST: ₹2.52 lakh. Reconciliation ties per-unit CAM invoice register to GSTR-1 aggregate lines month-on-month.
Common reconciliation breakages
Tariff hike pushes exempt tower into full taxation. The single largest error mode. AGM votes a ₹200-₹400/month CAM revision to fund a security wage hike; the RWA committee reads “we’re increasing by ₹300” as a small change; the treasurer misses that the pre-revision CAM was already at ₹7,300; the post-revision CAM at ₹7,600 flips the entire tower to 18% GST on the full amount. The GST liability shock lands one full quarter later at GSTR-9C reconciliation. Reconciliation control: alert on any unit whose forecast post-revision CAM would cross ₹7,500, before the tariff notice is issued.
Transfer charges, guest charges, late interest mixed into exempt CAM line. These heads are outside Sl. 77 exemption and taxable at 18% from the first rupee. A transfer fee of ₹35,000 collected on unit resale that gets booked as “CAM receipt from Unit 402” appears in the exempt supply line of GSTR-1 and creates a Section 122 misclassification exposure. Reconciliation control: enforce head-of-account discipline at receipt — transfer charge → GST-taxable head; late interest → GST-taxable head; CAM → exemption test at unit level.
ITC over-claimed on housekeeping and security invoices. Where any unit is above ₹7,500, ITC apportionment under Rule 42 applies — but most RWAs claim full ITC on the vendor invoices in GSTR-3B and remember to reverse only at year-end. This creates interest on the over-claimed ITC from month of claim to month of reversal (Section 50) — often ₹2-4 lakh interest exposure at year-end audit. Reconciliation control: compute the taxable turnover ratio each month and reverse ITC at Rule 42 proportion in the same GSTR-3B period as claim.
Developer-to-RWA CAM handover overlap. During the Occupancy Certificate to RWA-formation window (typically 6-18 months), the developer’s temporary maintenance contract may still be running while the RWA has started collecting CAM. Double-invoicing per unit for the same month is a common breakage. Reconciliation control: date the per-unit handover in the unit master; suppress developer-side maintenance invoice from the month RWA CAM begins.
Reserve fund / sinking fund treatment. Contributions to a designated sinking fund (major repair reserve) are typically treated as capital contribution to the RWA corpus and not as consideration for a supply — hence not taxable even for members above ₹7,500 on regular CAM. But if the sinking-fund contribution is bundled into the monthly CAM invoice without segregation, the whole line may be reclassified as CAM in an audit. Reconciliation control: separate sinking-fund head in the receipt register and in the GSTR-1 line, with a distinct audit trail.
Continue reading — Real estate cluster
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How a reconciliation platform handles this
Running per-unit CAM billing across a 1,200-unit mixed-tariff residential complex is not a spreadsheet exercise for long. The unit master, the monthly threshold evaluation, the exempt-versus-taxable GSTR-1 split, the Rule 42 ITC apportionment against the housekeeping and security vendor invoices, the head-of-account discipline for transfer and guest charges, and the GSTR-9C annual tie-back all sit on top of the same per-unit receipt ledger. Purpose-built real estate reconciliation software India treats each unit as a first-class entity with tariff, threshold flag, monthly CAM invoice, and GST classification carried through to the GSTR-1 line. TransactIG carries presets for RWA/CHS accounting including the Notification 12/2017-CTR Sl. 77 exemption logic, the CBIC Circular 109/28/2019-GST cliff-not-slab enforcement, the Section 22 aggregate turnover watch, and the Rule 42 monthly ITC apportionment. Customer outcomes include match-rate improvement from 51% to 88%, with build in two-to-four weeks on AWS Mumbai (ISO 27001:2022). For the wider reconciliation software India surface — including GSTR-2B, TDS, and payment-gateway reconciliation — the RWA can consolidate onto one platform.
Content authored by practitioners with experience at Amazon India, Intuit QuickBooks, and the Tata Group. Meet the team →
- ▸ Notification 12/2017-Central Tax (Rate), Sl. No. 77 — Services by an unincorporated body or a non-profit entity registered under any law for the time being in force, to its own members by way of reimbursement of charges or share of contribution up to an amount of ₹7,500 per month per member for sourcing of goods or services from a third person for the common use of its members in a housing society or a residential complex — exempt
- ▸ CBIC Circular No. 109/28/2019-GST dated 22 July 2019 — Where the maintenance charges exceed ₹7,500 per month per member, GST is chargeable on the entire amount and not just the differential above ₹7,500
- ▸ CBIC Circular No. 130/49/2019-GST — Aggregate turnover of the RWA above ₹20 lakh in a financial year triggers GST registration liability irrespective of whether individual member contribution is under ₹7,500 per month
- ▸ CGST Act, 2017 — Section 22 — Registration threshold of aggregate turnover ₹20 lakh (₹10 lakh in special category states) applied to the RWA as a person for GST purposes
- ▸ Schedule III, CGST Act, 2017 — Entry 5 — Sale of building post completion certificate is outside the scope of supply — the point from which CAM services provided by the RWA take over from the developer