How the home loan cost calculator works
The sticker price of a home is only the start. By the time you take possession you also owe stamp duty (5–9% of property value depending on the state), registration (~1%), GST if the property is under-construction (1% affordable / 5% non-affordable), and then twenty years of EMI payments—most of which are interest. This calculator turns all of that into a single “total lifetime outgo” figure and then nets out the tax savings you actually get from Sections 24(b) and 80C, leaving you with a true net cost of ownership.
The four cost buckets
- Down payment — property value minus loan amount. Indian banks typically lend 75–90% LTV (lower for the most expensive properties), so a ₹1 crore home generally needs ₹15–25 lakh of own funds.
- EMI payments over the loan tenure — principal plus interest, computed using the standard EMI formula. Over 20 years at 8.5%, total interest typically equals the principal itself.
- Stamp duty + registration — one-time on registration of the sale deed. Varies hugely by state; many states give a 1–2% rebate when the property is registered in a woman’s name.
- GST on under-construction property — 1% (affordable, ≤₹45L & carpet ≤60sqm metro) or 5% (non-affordable), charged on 2/3 of the gross price (the other 1/3 is deemed land value, exempt). Ready-to-move-in property carries no GST.
Stamp duty — the state-by-state lottery
India has no central stamp duty rate. Every state revenue department sets its own. Highlights:
- Lowest — Jharkhand 4%, Gujarat 4.9% (3.5% for women).
- Median — Maharashtra 6% (5% women), Karnataka 5.6%, Delhi 6% (4% women), Rajasthan 5%.
- Highest — Puducherry 9%, Assam 8.25%, Kerala 8%, Andhra Pradesh / Telangana / MP 7.5%.
On a ₹1 crore property the difference between Gujarat woman buyer (₹3.5 lakh) and Puducherry single buyer (₹9 lakh) is ₹5.5 lakh— material when budgeting closing costs.
Registration charge
Most states charge a flat 1% of property value for registration of the sale deed. Some exceptions:
- Telangana — 0.5%
- Maharashtra — 1% capped at ₹30,000 (a meaningful saving on high-value properties)
- Kerala / Odisha / Chhattisgarh — 2–4%
GST on under-construction
Notification 1/2018-CT(R) and amendments fix two GST rates on residential under-construction property:
- 1% (no input tax credit) — affordable housing: carpet area ≤60sqm in metros (Mumbai, Delhi NCR, Kolkata, Chennai, Hyderabad, Bengaluru) or ≤90sqm in non-metros, AND value ≤₹45 lakh.
- 5% (no input tax credit) — non-affordable residential.
- 0% — ready-to-move-in property (transaction is sale of completed immovable property, outside GST).
Both rates apply on 2/3 of the gross consideration (the other 1/3 is deemed land value and exempt). On a ₹1 crore non-affordable UC flat the GST liability is roughly ₹3.33 lakh.
Tax benefits under Sections 24(b) and 80C (old regime)
Two parts of the home-loan EMI qualify for income tax deductions under the old regime:
- Section 24(b) — interest paid on a home loan, capped at ₹2 lakh per year for a self-occupied property. Let- out property has no cap, but the loss from house property usable against other income is capped at ₹2 lakh (balance carried forward eight years).
- Section 80C — principal repayment, up to the combined ₹1.5 lakh 80C cap (shared with PPF, ELSS, EPF, life insurance premium, tuition fees, etc.).
- Stamp duty — the stamp duty paid in the year of purchase is also eligible under Section 80C up to the same ₹1.5 lakh combined cap. (We don’t separately model this; if your 80C is otherwise fully utilised, the stamp duty saving is marginal.)
For a joint loan with two co-owners (both names on the loan agreement and the sale deed), each co-owner can independently claim the full ₹2 lakh 24(b) and ₹1.5 lakh 80C—effectively doubling the household’s deduction limits. The joint-loan toggle on the form models this.
Critical caveat: the new tax regime (default since FY 2023-24) forfeits Section 24(b) entirely on self-occupied property and removes 80C deductions. If you’re on the new regime, the tax-savings block is informational only—your actual saving is zero. Use our income tax calculator to decide which regime is better for you given the home-loan deductions.
LTV and own-funds requirements
RBI rules cap home-loan Loan-to-Value (LTV) at:
- 90% for loans up to ₹30 lakh
- 80% for ₹30–75 lakh
- 75% for above ₹75 lakh
Stamp duty and registration cannot be financed by the home loan— these come out of own funds, on top of the down payment. Budget at least 20–30% of property value as cash on hand for a typical ₹1 crore purchase.
Worked example — ₹1 crore property in Maharashtra
Property ₹1 crore, loan ₹80 lakh at 8.5% for 20 years, woman buyer, ready-to-move:
- Down payment: ₹20 lakh
- Stamp duty (5% woman rate): ₹5 lakh
- Registration (capped at ₹30,000): ₹0.30 lakh
- Acquisition cost: ₹1.05 crore
- Monthly EMI (₹80L @ 8.5% 20yr): ₹69,426
- Total EMI payments over 20 yr: ₹1.67 crore
- Total lifetime outgo: ₹1.92 crore
- Annual Section 24(b) saving (30% bracket, capped): ₹60,000
- Annual Section 80C saving (capped, shared): ₹45,000
- Lifetime tax savings: ₹21 lakh
- Net cost of ownership: ₹1.71 crore
Frequently asked questions
- Can I claim stamp duty separately under 80C?
- Yes, in the year of purchase, but it shares the ₹1.5 lakh combined cap with PPF / EPF / ELSS. If you’re already maxing 80C elsewhere, the stamp duty deduction is a wash.
- Why does my actual tax saving differ from the calculator?
- The calculator uses a straight-line annual interest estimate (total interest / tenure). In reality, year-1 interest is much higher than year-20 interest, so the 24(b) cap binds in early years and not later. The lifetime total is approximately right; year-by-year varies.
- Is the LTV from RBI a hard cap?
- Yes, for scheduled commercial banks. NBFCs may stretch slightly above. Some banks bundle stamp duty and registration into a secondary unsecured loan—this is technically distinct from the home loan.
- How accurate is this calculator?
- EMI math is verified against published SBI / HDFC / ICICI tables (within ₹1). Stamp duty rates are the latest published by each state IGR portal as of 2026-04-17. Cross-checked against Magicbricks / 99acres calculators for 13+ scenarios.
Sources
- State revenue department / IGR portals (each state)
- CBIC GST notification 1/2018-CT(R) on UC residential property
- Section 24, 80C of Income Tax Act 1961 (Finance Act 2024 amendments)
- RBI Master Directions on housing finance LTV norms
Disclaimer. Stamp duty rates change frequently in state budgets. Always verify the current rate on your state’s IGR (Inspector General of Registration) portal before transacting. Tax benefits depend on your residency status and choice of regime each year—consult a Chartered Accountant for filing decisions.