6.5 GST, Home Loan & Total Transaction Cost Math

6.4 GST, Home Loan & Total Transaction Cost Math

Quick Summary: Stamp duty and registration are only part of what a buyer pays. Depending on whether the flat is under construction or ready, GST may add 1% or 5% — or nothing at all. On top of that sits the home loan, whose size is capped by RBI's loan-to-value norms and whose monthly cost follows a fixed EMI formula. An agent who can build up the total cash requirement in front of a client, honestly and quickly, prevents most late-stage deal collapses.

---

1. GST on Real Estate: The Single Most Important Distinction

Everything about GST on a residential sale turns on one question: has the completion certificate or occupancy certificate been issued?

• Under construction (no CC/OC yet): the transaction is treated as a supply of construction service. GST applies.
• Ready property (CC/OC issued, or after first occupation): under Schedule III of the GST Act, the sale of a building is treated as neither a supply of goods nor a supply of services. No GST applies at all.

This is why a ready-to-move flat and an under-construction flat at the same headline price are not the same price. It is also the single most common question an agent is asked, and the one most often answered wrongly.

Current Residential Rates

The rates below have applied since 1 April 2019 and are levied without input tax credit to the developer:

Commercial under-construction units are taxed differently and with input tax credit available. That rate was revised in the September 2025 GST rationalisation, so confirm the current commercial rate on cbic.gov.in before quoting it to a client rather than repeating a figure from memory.

The Deemed One-Third Land Deduction

GST cannot be levied on land. Because it is impractical to separate the land component of every flat, the law applies a deemed deduction of one-third of the total amount charged towards the value of land. The headline rate is applied to the remaining two-thirds:

$\text{GST Payable} = \text{Agreement Value} \times \frac{2}{3} \times \text{Headline Rate}$

Which is why 5% behaves like about 3.33%, and 1% behaves like about 0.67%, of the full agreement value.

The Affordable Housing Test — Both Limbs Must Pass

A unit qualifies for the 1% rate only if it satisfies both conditions:

1. Carpet area does not exceed 60 square metres in a metropolitan area, or 90 square metres in a non-metropolitan area; and
2. Consideration does not exceed ₹45 lakh.

The Mumbai Metropolitan Region counts as metropolitan. Note that the area test uses RERA carpet area as defined in Section 2(k) — the same figure you learned to compute in Section 6.3, not built-up or super built-up area. A 58 sq. m. flat in Thane priced at ₹52 lakh fails the second limb and is taxed at 5%, not 1%.

---

2. Home Loan Fundamentals for Agents

RBI Loan-to-Value Ceilings

The loan-to-value (LTV) ratio is the proportion of the property value a lender may finance. RBI prescribes ceilings for individual housing loans:

These are ceilings, not entitlements. A lender may sanction less based on income, credit history or the property's own valuation — and lenders underwrite against their own valuation, which can be lower than the agreement value.

The EMI Formula

The Equated Monthly Instalment on a reducing-balance loan is:

$\text{EMI} = \frac{P \times r \times (1+r)^{n}}{(1+r)^{n} - 1}$

Where $P$ is the principal, $n$ is the tenure in months, and $r$ is the monthly interest rate:

$r = \frac{\text{Annual Rate (\%)}}{12 \times 100}$

The practical intuition worth carrying: extending tenure lowers the EMI but sharply raises total interest paid, while a higher down payment lowers both. An agent who can show a client both levers is far more useful than one who only quotes the sticker price.

---

3. Worked Example: Building Up the Real Cash Requirement

Scenario: A client is buying an under-construction flat in Pune with an agreement value of ₹80,00,000. The RERA carpet area is 82 sq. m. The buyer is male. The ready reckoner value is below the agreement value. The bank offers 8.5% per annum over 20 years.

Step 1 — GST. Carpet area of 82 sq. m. is within the 90 sq. m. non-metro limit, but the ₹80 lakh consideration exceeds the ₹45 lakh cap. The affordable test fails, so the rate is 5%: $\text{GST} = 80{,}00{,}000 \times \tfrac{2}{3} \times 5\% = \text{INR } 2{,}66{,}667$

Step 2 — Stamp duty. Pune is a 7% jurisdiction for a male buyer (5% base + 1% metro cess + 1% LBT): $\text{Stamp Duty} = 80{,}00{,}000 \times 7\% = \text{INR } 5{,}60{,}000$

Step 3 — Registration fee. 1% capped at ₹30,000: $\min(80{,}00{,}000 \times 1\%,\ 30{,}000) = \text{INR } 30{,}000$

Step 4 — TDS under Section 194-IA. Consideration exceeds ₹50 lakh, so the buyer deducts 1% and remits it via Form 26QB. This is not an extra cost — it comes out of the seller's money — but the buyer must budget the cash flow: $\text{TDS} = 80{,}00{,}000 \times 1\% = \text{INR } 80{,}000$

Step 5 — Loan and down payment. At ₹80 lakh the LTV ceiling is 75%: $\text{Maximum Loan} = 80{,}00{,}000 \times 75\% = \text{INR } 60{,}00{,}000$ $\text{Down Payment} = 80{,}00{,}000 - 60{,}00{,}000 = \text{INR } 20{,}00{,}000$

Step 6 — Total own funds required. Stamp duty, registration and GST are not funded by the lender: $20{,}00{,}000 + 5{,}60{,}000 + 30{,}000 + 2{,}66{,}667 = \text{INR } 28{,}56{,}667$

The client who arrived believing they needed ₹20 lakh in fact needs roughly ₹28.6 lakh — about 43% more. Surfacing this at the first meeting rather than at the registration counter is exactly the kind of guidance Section 10(d) and Rule 17 expect from an agent.

Step 7 — The EMI. With $P = 60{,}00{,}000$, annual rate 8.5% so $r = 0.085/12 \approx 0.0070833$, and $n = 240$ months, the EMI works out to approximately ₹52,070 per month. Over 240 months that is roughly ₹1.25 crore repaid against ₹60 lakh borrowed.

---

4. Comparing Under-Construction and Ready Property

On identical headline prices, the ready flat costs about ₹2.67 lakh less in tax — but the under-construction flat carries construction risk, a staged payment plan, and the possibility of delay interest under Section 18. An agent's job is to lay out both sides of that trade, not to steer the client toward whichever one pays a higher commission.