The complete income-tax saving guide (Income-tax Act, 2025) — every legal way to pay less

References are to the Income-tax Act, 2025 (with the old 1961-Act number in brackets), for FY 2025-26 (AY 2026-27). This is a map — click any link for the full worked guide.

Key takeaway

Saving tax legally is not about one clever trick — it's a sequence. First you pick the regime that suits you, then you stack the exemptions and deductions you actually qualify for, then you plan the one-off events (a property sale, a bonus, a retirement payout) so they're taxed the least. Done properly, a salaried person can pay nil tax up to ₹12.75 lakh, and higher earners can cut their bill by lakhs a year. Work through the eight steps below in order.

Step 1 — Choose the right regime (the single biggest decision)

The new regime (Section 202, old 115BAC) is now the default. It has lower slab rates and a large rebate — nil tax up to ₹12 lakh (₹12.75 lakh for the salaried after the ₹75,000 standard deduction) — but it removes most exemptions and deductions (HRA, LTA, 80C, home-loan interest, your own NPS). The old regime keeps all of those but has higher rates and a smaller ₹5 lakh rebate.

The rule of thumb: if you have a big HRA + 80C + home-loan interest stack (often ₹4–5 lakh of deductions), the old regime usually still wins. If you have few deductions, the new regime is simpler and lower. You can switch every year if you have only salary income — see old vs new regime and switching rules. Just above ₹12 lakh, marginal relief softens the jump.

Step 2 — Bank every salary exemption

Before deductions, several parts of your salary are exempt outright:

• Standard deduction — ₹75,000 (new) / ₹50,000 (old), automatic — details.
• House Rent Allowance (HRA) — exempt to the least of actual HRA, rent minus 10% of salary, or 50%/40% of salary — HRA guide. No HRA? Claim Section 134 (80GG).
• Leave Travel Allowance (LTA) — domestic travel, twice in a 4-year block — LTA guide.
• Retirement receipts — gratuity (₹20 lakh), leave encashment (₹25 lakh), commuted pension and VRS (₹5 lakh).
• Allowances — children education, hostel, uniform and duty allowances — special allowances.

On the new regime, most of these go, but a specific set survives — the ₹75,000 standard deduction, employer NPS, the duty allowances and all retirement exemptions. Restructuring CTC around employer NPS (14%) is the single biggest lever left in the new regime.

Step 3 — Stack the deductions (Chapter VIA — old regime)

These reduce your taxable income in the old regime. Max them in this order:

• Section 123 (80C) — ₹1.5 lakh: PPF, EPF, ELSS, life insurance, home-loan principal, children's tuition — 80C guide.
• NPS — extra ₹50,000 under 80CCD(1B), plus employer NPS (works in both regimes).
• Health insurance — ₹25,000/₹50,000 under Section 126 (80D) for family + parents.
• Education-loan interest — no cap for 8 years — Section 129 (80E).
• Donations — 50%/100% under Section 135 (80G); rent without HRA under 80GG.
• Disability & illness — fixed deductions under Sections 127/128 (80DD/80DDB/80U).
• Savings interest — ₹10,000/₹50,000 under Section 153 (80TTA/80TTB).

Maxing 80C (₹1.5L) + 80CCD(1B) (₹50k) + 80D (₹50k) alone shelters ₹2.5 lakh of income — worth ~₹78,000 in the 30% slab.

Step 4 — Use your home loan fully

A home loan is one of the largest reliefs available:

• Interest up to ₹2 lakh on a self-occupied house — Section 22 (24b).
• Full interest on a let-out property (loss set-off capped at ₹2 lakh/year).
• Principal under 80C, plus a possible extra ₹1.5 lakh under Section 131 (80EEA) for affordable homes.
• Pre-construction interest claimed in 5 instalments, and a joint loan to double the family benefit.
• Landlords also get the flat 30% standard deduction on rent.

Step 5 — Plan capital gains around the exemptions

A property or investment sale is where the biggest single savings sit — the tax can often be brought to zero:

• Reinvest in a house — Section 86 (54F) / Section 82 (54).
• Capital-gains bonds — up to ₹50 lakh under Section 85 (54EC).
• Farm land into farm land — Section 83 (54B); property into a startup (54GB).
• Equity — the first ₹1.25 lakh of LTCG is tax-free every year; harvest it annually.
• Know the rates and set-off rules — see the capital-gains reckoner, STCG vs LTCG and loss set-off.

Step 6 — Route income through tax-free channels

Some income is simply exempt under Section 10:

• PPF, EPF & Sukanya (EEE), agricultural income, gifts from relatives and on marriage/inheritance.
• Life-insurance maturity, a partner's profit share, Sovereign Gold Bonds at maturity and tax-efficient SWP income.

Step 7 — Structure & split income (for families and business owners)

Higher-income families save most by spreading income to lower-slab hands and choosing the right entity:

• HUF as a second taxpayer — HUF planning; and gifting to adult family (mind clubbing).
• Family trust to split income and pass on wealth — family trust guide.
• Entity choice — proprietor vs firm/LLP vs company — choose the right entity, the 22% company rate and 15% new-manufacturing rate.
• Owner-directors — director-loan interest and renting premises to your company, done legitimately.

Step 8 — Claim your special-status benefits

• Senior citizens — extra exemptions and super-senior benefits.
• NRIs — tax-free NRE/FCNR interest, the special 20% regime, and cutting excess TDS.
• Startups & employers — the 80-IAC tax holiday and the new-employment deduction.

A worked example — a ₹20 lakh salary

Say you earn ₹20 lakh. On the new regime: standard deduction ₹75,000 + employer NPS ₹1.68 lakh (14% of a ₹12L basic) drops taxable income to ~₹17.6 lakh, with tax around ₹2 lakh. On the old regime: HRA ₹2.4 lakh + 80C ₹1.5 lakh + 80CCD(1B) ₹0.5 lakh + 80D ₹0.5 lakh + home-loan interest ₹2 lakh brings taxable income to ~₹11.6 lakh — and the tax can be lower still. The right answer depends on your rent and loan; compare both every year.

Forms required

• Form 16 / 16A (TDS), Form 26AS / AIS (reconcile), the correct ITR (1/2/3/4).
• Form 10E for arrears relief, Form 67 for foreign tax credit, Form 10-IEA to opt regimes for business income.

Common mistakes that cost people money

• Not comparing regimes. Blindly staying on the default new regime when your HRA + 80C + home-loan stack would make the old regime cheaper — thousands lost every year. Always run both.
• Missing a deduction you qualified for. Health insurance for parents (80D), education-loan interest (80E), the extra ₹50,000 NPS (80CCD(1B)) and savings interest (80TTA/80TTB) are the most-forgotten.
• Paying donations or rent in cash. Cash above the limit gets nil deduction under 80G/80GG — always use a banking channel.
• Selling property without planning the exemption. A little foresight (54/54F/54EC) can turn a large capital-gains bill into zero — but only if you reinvest within the window or park the money in a Capital Gains Account before the return due date.
• Filing late. A belated return means a late fee and, worse, the loss of carry-forward of business/capital losses — see deadlines & penalties.
• Ignoring clubbing. Gifting to a spouse or minor to "split" income simply clubs it back to you — split to adult family or use a genuine loan instead.

What changed under the Income-tax Act, 2025

The Income-tax Act, 2025 replaced the 1961 Act and renumbered every section (we show the old number in brackets throughout). The substance of most reliefs carries over, but the new regime is now the default with the ₹12 lakh rebate, the standard deduction is ₹75,000 in it, and capital-gains rates were simplified (equity LTCG 12.5% over ₹1.25 lakh, most other LTCG 12.5% without indexation) from 23 July 2024. Keep an eye on the circulars and notifications for the latest limits, and confirm current figures before you act.

Frequently asked questions

Which regime saves more tax?

It depends on your deductions. With a large HRA + 80C + home-loan-interest stack (roughly ₹4 lakh or more of deductions), the old regime usually wins; with few deductions, the new regime is lower and simpler. Compare both every year — salaried taxpayers can switch freely.

How much tax can a salaried person legally save?

On the new regime, nil tax up to ₹12.75 lakh after the standard deduction and rebate. On the old regime, stacking HRA, 80C, 80CCD(1B), 80D and home-loan interest can shelter ₹4–5 lakh of income — worth well over ₹1 lakh of tax in the 30% slab.

Can I save tax after the financial year has ended?

Mostly no — deductions relate to payments made during the year, so plan before 31 March. But at filing you can still choose the better regime, claim exemptions the employer missed (like HRA), and claim arrears relief via Form 10E.

Do I need a CA to save tax?

For a simple salary you can do it yourself with this guide. For capital gains, business income, multiple properties, NRI status or family structuring, a CA usually saves far more than the fee by catching exemptions and structuring the big events correctly.

The bottom line

Tax saving compounds when you do it in order and every year: choose the regime, bank the exemptions, stack the deductions, and plan the big events. Most people leave money on the table simply by not comparing regimes or missing a deduction they qualified for. Start at Step 1, follow the links, and if your situation is even slightly complex, have a CA build the plan — the fee is usually a fraction of what a good plan saves.