You have probably seen the claim that Indian households quietly lose 10–20% of their income every year to bad financial habits. It is a good line. I have not been able to find a reliable source for it, and I would not quote it to a client.
What I can do is take one realistic household, go through its money the way I would go through a client's file, and put a rupee figure on each leak that can honestly be measured. Then add them up and see what the percentage actually is — for this family, not for India.
Everything below is a hypothetical example. The family, its numbers and the assumptions are illustrative, and your own result could be very different.
# The household
- Spouse A: salary ₹15 lakh a year.
- Spouse B: salary ₹10 lakh a year.
- Combined salary income: ₹25 lakh.
- A self-occupied flat with a home loan; interest of ₹2 lakh a year.
- Mutual fund investments of ₹12 lakh, all in regular plans, bought through a distributor years ago.
- About ₹5 lakh sitting in a savings account beyond what they need as a ready buffer.
- In January 2027, A sold some listed equity shares held for less than a year, with a short-term gain of ₹3 lakh.
- B occasionally carries a credit card balance.
The year in question is Tax Year 2026-27 (FY 2026-27 — the return you file in 2027, earlier called AY 2027-28). Tax slabs used are the current ones: new regime 0–4 lakh nil, then 5% steps to 30% above ₹24 lakh, with the rebate up to ₹12 lakh of taxable income; old regime 0–2.5 lakh nil, 5%, 20% and 30%; 4% cess.
# Leak 1: The wrong tax regime — ₹27,300
A has a home loan, pays life insurance premiums and puts money into NPS, and has always believed that "with a home loan, old regime is better". So A opts for the old regime.
Here is what A's salary tax looks like both ways:
| Old regime | New regime | |
|---|---|---|
| Gross salary | ₹15,00,000 | ₹15,00,000 |
| Standard deduction | ₹50,000 | ₹75,000 |
| Section 80C (life insurance, PPF, principal) | ₹1,50,000 | — |
| Section 80D (self and family health cover) | ₹25,000 | — |
| Home loan interest, self-occupied | ₹2,00,000 | — |
| Additional NPS deduction | ₹50,000 | — |
| Taxable salary | ₹10,25,000 | ₹14,25,000 |
| Tax before cess | ₹1,20,000 | ₹93,750 |
| Tax with 4% cess | ₹1,24,800 | ₹97,500 |
The new regime is cheaper by ₹27,300, even with all those deductions. For A's salary, the old regime only starts to win once deductions beyond the standard deduction reach roughly ₹5.44 lakh. A has ₹4.25 lakh.
B's position is simpler: taxable salary of ₹9,25,000 under the new regime, fully covered by the rebate, so tax is nil. B is already in the default regime and has nothing to fix.
In salaried returns this is a leak I come across regularly — not a regime chosen wrongly after analysis, but a regime chosen once, years ago, and never recomputed. Our old vs new regime decision guide walks through the break-even logic.
# Leak 2: Regular-plan cost on mutual funds — ₹9,000 a year
Every mutual fund scheme has a direct plan and a regular plan. The regular plan's expense ratio includes the distributor's commission; the direct plan's doesn't. The gap varies by scheme and fund house, and you can see the actual figures in each scheme's disclosures.
Assumption: a gap of 0.75% a year across the family's ₹12 lakh.
- Annual cost: 0.75% × ₹12,00,000 = ₹9,000.
That looks small. It compounds. If the same ₹12 lakh were left for 15 years growing at an assumed 11% a year in the direct plan and 10.25% in the regular plan, the direct-plan version would reach about ₹57,41,507 and the regular-plan version about ₹51,86,331 — a difference of about ₹5,55,177, with no extra investment on either side. The assumptions are illustrative; the direction is not.
Two cautions before anyone switches. Moving from regular to direct means selling units, which can trigger capital gains tax and exit loads. And if your distributor gives you advice you actually use, that has a value too. The point is to know what you are paying, not to assume the answer. Our mutual fund taxation guide covers the tax side of a switch.
# Leak 3: Idle money in the savings account — ₹14,770 a year
Families keep money in savings accounts because it feels safe and reachable. Some of that is sensible — an emergency buffer should be reachable. The leak is the amount beyond the buffer that just sits.
Assumptions: ₹5 lakh of surplus balance; savings account at 2.5%; a sweep-in FD or a liquid fund option at 6.0%. Both rates are illustrative, not current offers.
- Pre-tax gap: 3.5% × ₹5,00,000 = ₹17,500.
- Interest from both is taxed at slab rate. A's marginal rate under the new regime is 15% plus cess, or 15.6%.
- Post-tax gap: ₹17,500 × (1 − 0.156) = ₹14,770.
This money is not lost overnight. It is lost a few hundred rupees a week, which is why nobody notices. The emergency fund guide helps decide how much should stay in the savings account and how much should not.
# Leak 4: Interest for missed advance tax — ₹3,120
A's January capital gain of ₹3 lakh is short-term gain on listed equity, taxed at 20%. With 4% cess, that is ₹62,400 of tax. A's employer deducts TDS on salary only, so none of this is covered.
Because the tax exceeds ₹10,000, advance tax applies. Since the gain arose after 15 December, the full amount was due by the 15 March instalment. A paid nothing until filing the return in July 2027.
- Interest for deferment under Section 425 of the Income-tax Act, 2025 (old 234C): 1% × ₹62,400 × 1 month = ₹624.
- Interest for default under Section 424 (old 234B): 1% × ₹62,400 × 4 months (April to July) = ₹2,496.
- Total: ₹3,120.
Small, but entirely avoidable — and it grows quickly if the gain is larger or the return is filed later. The 234A/B/C interest calculator and our advance tax interest guide show the full mechanics.
# Leak 5: Credit card interest — ₹6,300
B pays the minimum due on a card for three months during a tight period, with an average revolving balance of ₹60,000.
Assumption: a finance charge of 3.5% a month. Card finance charges vary and are disclosed in each card's terms; check yours.
- 3.5% × ₹60,000 × 3 months = ₹6,300, before GST on the finance charge and before the loss of the interest-free period on new purchases while a balance is outstanding. So the real cost is higher than this figure.
This is the single most expensive form of borrowing most households have access to, and it is usually unintended. The simplest fix is a standing instruction to pay the full statement balance, not the minimum due.
# What we did not put a number on
Some leaks are real but cannot honestly be expressed as an annual rupee loss for this family.
Under-insurance. If A's term cover is far short of the family's needs, or the health cover has not kept pace with hospital costs, the family may lose nothing this year — and a very large amount in one bad year. That is a risk, not a yearly cost, so it is not in the total. It is still the item I would check first. Our guide on term insurance adequacy sets out a sizing method.
Unclaimed deductions. Once A moves to the new regime, most deductions stop mattering. For this household the unclaimed-deduction leak is effectively ₹0 after fixing Leak 1. That is itself worth noticing: people spend a lot of effort chasing deductions in a regime they should have left. The one significant new-regime item for salaried people is employer contribution to NPS, and that depends on whether the employer offers it.
Unused ₹1.25 lakh equity LTCG exemption. If A also holds equity with long-term gains, the annual exemption on the first ₹1.25 lakh of such gains lapses if not used. Booking and reinvesting that much each year could save up to ₹16,250 of tax (12.5% plus cess) when the holdings are eventually sold. It is a real planning point, but the saving is deferred and depends on the family's holdings, so it is not in the total.
HUF. A Hindu Undivided Family is a separate taxpayer with its own basic exemption. If this family had genuine HUF property or income, assessing it separately could reduce the family's tax. If the idea is to move A's or B's own savings into an HUF, clubbing provisions usually cancel the benefit. Whether there is a leak here depends entirely on facts, so it is not counted. A CA should look at the facts before anyone forms or funds one.
# Adding it up
| Leak | Annual cost in this example |
|---|---|
| Wrong tax regime (Spouse A) | ₹27,300 |
| Regular-plan cost on ₹12 lakh | ₹9,000 |
| Idle savings balance (post-tax) | ₹14,770 |
| Interest for missed advance tax | ₹3,120 |
| Credit card interest (before GST) | ₹6,300 |
| Total measured leakage | ₹60,490 |
| As % of ₹25 lakh salary income | about 2.4% |
So for this household, the leaks we could measure come to about 2.4% of salary income in one year — not 10–20%.
Two honest observations about that number.
First, 2.4% of income is still ₹60,490 a year, most of it fixable in an afternoon. Over a decade, with compounding on the fund costs and idle cash, it is a meaningful sum.
Second, the items that could hurt this family most — under-insurance, an unplanned hospitalisation, a missing will — are not in the table at all. A leakage audit that only counts rupees misses the risks that do not show up until they happen.
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# Related reading
- Old vs new tax regime — the decision guide
- Advance tax interest under 234A, 234B and 234C
- Mutual fund taxation — what a switch costs
- Emergency fund — how much, and where to keep it
# References (verified 23 September 2026)
- Income Tax Department e-filing portal — Tax regimes and slab rates for individuals: https://www.incometax.gov.in/iec/foportal/help/individual-business-profession
- Axis Max Life — Income tax slabs for FY 2026-27 (Budget 2026 made no change to slabs, rebate or cess): https://www.axismaxlife.com/blog/tax-savings/income-tax-slab-2026-27
- TaxGuru — Advance tax under the Income-tax Act, 2025: liability, due dates and interest: https://taxguru.in/income-tax/advance-tax-income-tax-act-2025-liability-due-dates-interest.html
Disclaimer: This article is educational and general in nature. The household, its figures and every rate used (expense ratio gap, deposit and savings rates, card finance charges, investment returns) are hypothetical assumptions for illustration, not current market data or a prediction; your own position will differ. VittSphere ONE is not a SEBI-registered Investment Adviser or Research Analyst and not an IRDAI-registered insurance intermediary, and it does not recommend any specific fund, bank, card or policy. Confirm tax computations with a qualified Chartered Accountant before acting. Data verified 23 September 2026.
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