A low-maintenance core using index funds and ETFs — how to pick them, why tracking error matters more than returns, and a three-fund portfolio that needs one review a year.
There is a specific investor for whom this article is written: someone with a demanding job, no interest in reading annual reports, and a reasonable suspicion that most financial activity is expensive noise.
That suspicion is largely correct. A portfolio of three or four funds, funded automatically and reviewed once a year, will outperform the majority of actively managed retail portfolios — not because passive investing is magic, but because it eliminates the two largest sources of underperformance: costs and behaviour.
Why Low-Maintenance Works
Costs compound in the wrong direction
A 1% annual difference in expenses consumes roughly a quarter of your final corpus over 30 years. Direct plans of broad index funds commonly carry total expense ratios in the 0.1–0.3% range. Regular plans of active funds are often several times that.
You cannot control returns. You can control what you pay, and the effect is certain rather than probabilistic.
Activity correlates with underperformance
Every rebalance, switch and tactical call creates transaction costs, capital gains tax and an opportunity to be wrong. Short-term equity gains are taxed at 20%; long-term gains above ₹1.25 lakh a year at 12.5%. A portfolio churned regularly compounds on a permanently reduced base.
You cannot be talked out of a system
The hardest part of investing is doing nothing during a drawdown. AMFI data showed the SIP stoppage ratio crossing 100% in March and April 2026 — more accounts ending than starting. A portfolio designed to require no decisions removes the moment where a bad decision gets made.
Index Fund or ETF?
Both track an index. The difference is mechanical.
| Index fund | ETF | |
|---|---|---|
| How you buy | Directly from the AMC, at day-end NAV | On the exchange, at market price |
| Demat account | Not required | Required |
| SIP | Straightforward, automated | Possible but clumsier on most platforms |
| Pricing risk | None — you get NAV | Can trade at a premium or discount to iNAV |
| Liquidity risk | AMC redemption | Depends on on-screen volumes and market makers |
| Expense ratio | Slightly higher | Usually slightly lower |
| Extra cost | None | Brokerage, STT, demat charges |
For most people: index funds. The marginally lower expense ratio of an ETF is usually offset by brokerage, bid-ask spreads and the operational friction of manual purchases. ETFs make sense for large lump sums and for investors already comfortable with exchange execution.
One ETF-specific caution: thinly traded ETFs can trade meaningfully away from their indicative NAV. Always check the on-screen spread and volume before placing a large order, and use limit orders rather than market orders.
How to Choose an Index Fund
Counterintuitively, do not choose on past returns. Two funds tracking the same index should produce nearly identical returns; where they differ, the difference is cost and execution.
1. Tracking error and tracking difference
Tracking difference is how far the fund’s return has fallen behind the index. Tracking error is the volatility of that gap. Lower is better on both. This is the single most important selection criterion for a passive fund, and it is disclosed in the factsheet.
2. Total expense ratio
Choose the direct plan. Always. The difference between direct and regular is pure distribution commission.
3. Fund size
Very small index funds can have higher tracking error and operational friction. Reasonable scale helps.
4. Which index
- Nifty 50 / Sensex — the 50 or 30 largest companies. Concentrated in a handful of sectors.
- Nifty Next 50 — companies 51 to 100. More volatile, historically higher dispersion of outcomes.
- Nifty 500 / Total Market — broadest domestic coverage, includes mid and small caps. For a single-fund core, this is the most complete option.
- Nifty Midcap 150 / Smallcap 250 — for deliberate size-factor exposure, not for the core.
A Three-Fund Portfolio
For an investor with a horizon beyond seven years:
| Sleeve | Allocation | Instrument |
|---|---|---|
| Indian equity core | 60% | Nifty 500 or total market index fund, direct plan |
| Debt | 25% | Short-duration debt fund, or PPF / EPF if already contributing |
| Gold | 10% | Gold ETF or gold fund of funds |
| International equity | 5% | Global index fund, subject to availability |
A note on international funds: several Indian AMCs have periodically suspended fresh inflows into overseas schemes because of RBI’s industry-wide overseas investment limits. Availability is not guaranteed at any given time. If closed, hold the allocation in the domestic core rather than waiting.
A note on debt: debt mutual fund units bought on or after 1 April 2023 are taxed at slab rate regardless of holding period. For those in higher slabs already contributing to EPF and PPF, those instruments often do the debt job more efficiently.
The Operating System
This is the whole maintenance requirement.
Monthly, automatic: SIP on the second working day after salary credit. No decisions.
Annually, once, on a fixed date: 1. Check allocation against targets. Rebalance only if any sleeve has drifted more than 5 percentage points. 2. Rebalance with new contributions first — redirect fresh money to the underweight sleeve before selling anything. This avoids capital gains entirely. 3. Increase the SIP amount in line with your income increment. A 10% annual step-up roughly doubles the 25-year outcome versus a flat SIP. 4. Review realised gains for the year and consider harvesting long-term gains up to the ₹1.25 lakh annual exemption. 5. Confirm nominations are current on all accounts.
Never: – Switch funds because another one did better last year – Stop the SIP during a correction – Add a fifth, sixth and seventh fund to feel diversified
That is the entire system. Roughly one hour a year.
When Active Management Earns Its Fee
This is not an argument that passive is always right.
Active management has a stronger case in less efficient segments — mid cap, small cap, and debt, where security selection and credit assessment matter more and index construction is less clean. A reasonable structure is a passive core with one active flexi-cap or mid-cap fund as a satellite.
What is hard to justify is paying active fees for a large-cap fund whose portfolio closely resembles the index it is benchmarked against.
What This Approach Deliberately Gives Up
Honesty about the trade-offs:
- No outperformance. You will get the index return minus a small tracking difference. You will never beat the market, by construction.
- Full participation in falls. Passive funds do not go to cash. A 35% index decline is a 35% fund decline.
- No tactical response to valuations or macro conditions.
For most investors, giving up these three is a good trade for near-certain cost savings and the removal of behavioural error.
Frequently Asked Questions
Is a Nifty 50 index fund enough on its own?
It is a reasonable single holding, but it is concentrated in large caps and a few sectors. A Nifty 500 or total market fund is more complete for a one-fund core.
How much does hassle-free investing actually cost?
A direct-plan broad index fund typically carries a total expense ratio in the 0.1–0.3% range. Verify the current figure in the scheme’s factsheet before investing.
Should I switch my existing active funds to index funds?
Not wholesale. Switching triggers capital gains and possible exit loads. Direct new contributions to index funds and let existing holdings run, reviewing them at your annual check.
What if the market is at an all-time high?
Markets spend a large share of their history near highs — that is what a long-term uptrend means. A system that requires you to judge market levels is not a hassle-free system.
Sources and Further Reading
- AMFI monthly industry data and scheme categorisation — amfiindia.com
- Scheme information documents and factsheets for tracking error and TER
- SEBI Investor Education portal — investor.sebi.gov.in
- RBI guidelines on overseas investment limits for mutual funds