Saving Tax on a Home Loan: Interest and Principal Rules for Bangalore Buyers

Borrowing for a flat can lower an income tax bill through two separate routes, one tied to the interest and the other to the principal. Each has a ceiling, each has conditions, and neither is available unless the borrower is in the right tax regime. The sections below explain both for a Bangalore buyer, using the numbering of the current law and a worked example.

Which Tax Regime Applies?

Individuals are placed in the new regime unless they opt out. It has lower slab rates, but for a home the owner lives in, it permits neither an interest deduction nor a principal deduction. Only the old regime gives both.

The old regime charges higher rates, so whether it pays off depends on every deduction a person can claim together. For people in higher brackets, the loan by itself rarely supplies enough deductions to justify the switch. The choice should be reviewed every year, because the interest share of each EMI shrinks as the loan ages.

New Section Numbers, Same Limits

The law changed on 1 April 2026, when the new Income-tax Act, 2025 took over and began calling April through March a "tax year". Home loan relief survives, but its section numbers are different:

• Interest where the owner occupies the flat: section 22 (earlier 24(b)), capped at Rs. 2,00,000 per year
• Interest where the flat is let: also section 22, with all of it set against the rent
• Principal repaid: section 123 (earlier 80C), capped at Rs. 1,50,000 per year and shared with other eligible items
• Transfer costs, meaning duty and the registration fee: section 123 again, within the same Rs. 1,50,000 and only in the year the money goes out

Every taxpayer has separate limits. Salaried borrowers tell the employer, who then adjusts the tax deducted monthly, and the final claim goes into the return.

Interest on an Owner-Occupied Flat

What a borrower pays as interest to buy or build a home is subtracted while house property income is worked out. If the owner lives there, the subtraction stops at Rs. 2,00,000 per year. Two such homes at most are accepted, and the single ceiling is shared between them.

The higher ceiling needs three conditions:

1. The money was borrowed to purchase or construct the home itself.
2. The purchase or construction is complete inside five years counted from the end of the loan's financial year.
3. The lender provides a certificate stating the interest due for the year.

Miss the five-year window and the ceiling falls to Rs. 30,000 per year. Borrowing for repairs or renovation is also held to Rs. 30,000. Interest counts as it accrues, so the lender's certificate supplies the number to claim.

Interest Paid Before the Flat Is Ready

Someone who buys a flat that is still being built may service the loan over two or three years, without living there. Interest in that stretch cannot be claimed at once. The sum is accumulated until 31 March preceding the year the building is completed.

That total comes back as five equal instalments of deduction, the first in the completion year. Rs. 6,00,000 of interest before completion would mean Rs. 1,20,000 each year over five years. For an owner-occupied flat, an instalment plus that year's own interest must stay under Rs. 2,00,000, and section 22 now says so expressly, after the Finance Act, 2026.

Interest on a Rented Flat

Renting the flat out changes the arithmetic. Begin with the rent, remove municipal tax paid, and allow 30% of the rest as a standard deduction. After that comes the entire year's interest, with no fixed cap.

Early in the loan the result is usually a loss. Under the old regime up to Rs. 2,00,000 of that loss can be offset against salary or other income the same year. The leftover is carried forward eight years and can meet only house property income.

The Principal Deduction

The principal element of each EMI qualifies under section 123, formerly 80C, within Rs. 1,50,000 a year. Provident fund, life insurance premiums, children's school tuition and tax-saving funds use the same room. An employee whose provident fund already absorbs most of the room has little left for principal.

Several conditions apply:

• Eligible lenders are banks, housing finance companies and certain other institutions, so money borrowed from relatives is ruled out
• The property must be a residence, with the claim starting after construction ends
• Repayments on borrowing for repairs, renovation or extensions are left out
• The owner keeps the flat for five years after the financial year in which possession was taken

A sale within that period undoes the benefit. Every rupee of principal deducted earlier is taxed as the seller's income in the sale year.

What Stamp Duty Adds

Transfer costs, namely duty and registration charges, also draw on the Rs. 1,50,000 ceiling, in the payment year alone. Any unclaimed balance lapses.

In Bangalore the duty by itself often overshoots the ceiling. Karnataka levies 5.6% inclusive of cess and surcharge on homes costing more than Rs. 45 Lakhs, with registration at 2% on top. An old-regime buyer may therefore use up the whole limit in the registration year, ahead of any principal.

Numbers in Practice

As an illustration, a Rs. 75 Lakhs loan at 8.5% interest, running 20 years, finances a flat the owner occupies. The monthly instalment is roughly Rs. 65,087. In the first twelve instalments interest is roughly Rs. 6.32 Lakhs, and principal is Rs. 1.49 Lakhs.

Under the old regime only Rs. 2,00,000 of the interest counts, plus the principal if nothing else uses up section 123. So Rs. 3.49 Lakhs is deductible out of Rs. 7.81 Lakhs paid. Cess included, the saving is close to Rs. 1,08,900 in the 30% slab and near Rs. 72,600 in the 20% slab.

The remaining Rs. 4.32 Lakhs of interest earns no relief because it exceeds the limit. The savings exist only if the old regime yields the lower total tax; in the new regime they are nil.

When Two Owners Share a Loan

A joint owner who signed the loan and contributes towards the instalment claims separately. Under the old regime a pair of such owners can together deduct, at most, Rs. 4,00,000 as interest and Rs. 3,00,000 as principal, each in proportion to ownership share and actual payment.

In the example, spouses sharing ownership equally carry Rs. 3.16 Lakhs of interest apiece. A deduction of Rs. 2,00,000 each means the household claims Rs. 4,00,000 out of the Rs. 6.32 Lakhs paid. The shares belong in the sale deed ahead of registration.

Reliefs That Have Lapsed

First-time buyers once had two extra interest reliefs, sections 80EE and 80EEA, which turned on the loan's sanction date. The later one reached loans sanctioned until 31 March 2022 for homes whose stamp value did not exceed Rs. 45 Lakhs. A fresh loan falls outside both, so planning rests on the two main deductions.

Papers Worth Filing Together

Keep these ready for any query from the employer or the tax department, starting in year one:

• The lender's annual certificate showing how EMIs divide between interest and principal
• Loan agreement and sanction letter
• The registered deed of sale, along with receipts for duty and fee
• A possession letter or occupancy certificate, to fix the completion year
• A statement of pre-possession interest, showing the five instalments

Use our EMI calculator to see the instalment and upfront costs at any price. For HSR Layout or Devanahalli, as for anywhere else, the budget should rest on the EMI alone, with tax relief as a bonus.