Portfolio Review and Rebalancing

If you set a 70:30 equity-debt split and equity markets rise sharply over a year, your portfolio might quietly shift to 80:20 — not because you chose to take more risk, but because one part simply grew faster than the other.

Rebalancing means periodically adjusting your holdings back toward your original target allocation — trimming the portion that's grown too large and adding to the portion that's shrunk, restoring your intended risk level.

Question	Answer
Why it drifts	Markets move at different speeds — equity usually grows faster than debt over time, silently skewing your split
How often	Once a year is enough for most individual investors — more often adds cost without much benefit
What it costs	Selling to rebalance can trigger capital gains tax — factor this in, especially for equity held under a year

A Worked Example

You start with ₹10 lakh split 70:30 (₹7 lakh equity, ₹3 lakh debt). After a strong year, equity grows to ₹9.1 lakh while debt grows modestly to ₹3.2 lakh — a total of ₹12.3 lakh, but now split roughly 74:26.

To rebalance back to 70:30: Sell ≈₹0.49 lakh of equity and move it into debt — restoring your original 70:30 risk level, locking in some of the equity gains along the way.

Two Ways to Rebalance

Method	How It Works
Sell and shift	Redeem from the overgrown asset and invest the proceeds into the underweight one. Direct and immediate, but triggers a taxable event on whatever you sell
Rebalance with new money	Instead of selling, direct your next few SIPs or lumpsum additions entirely toward the underweight asset until the ratio corrects itself — no tax event triggered

Tip: If you're still actively investing each month, rebalancing with new money is usually the more tax-efficient route — you only need to "sell and shift" when new contributions alone aren't enough to correct the drift.

Working Out How Much New Money Is Needed

Before deciding whether new contributions alone can fix the drift, it helps to estimate the gap in rupee terms rather than guessing:

Step	What to Do
1. Find the target amount	Multiply your total portfolio value by your target % for the underweight asset (e.g. 30% of ₹12.3 lakh = ₹3.69 lakh debt target)
2. Find the current shortfall	Subtract the current holding from the target (₹3.69 lakh target − ₹3.2 lakh actual = ₹0.49 lakh shortfall)
3. Compare to upcoming contributions	If your next few months of SIPs into debt can cover ₹0.49 lakh, you may not need to sell anything at all

If monthly contributions are large relative to the drift, this "new money" approach alone can often fully correct a modest imbalance within a few months, without touching existing holdings.

Signs You're Overdue for a Review

It's been over a year: If you can't remember your last review, that alone is a signal — an annual check is the minimum cadence.
A major life event happened: A new job, marriage, a child, or nearing a goal deadline all change your ideal allocation — review sooner than the usual annual mark.
One fund dominates your portfolio: If a single holding has grown to be a disproportionate share of your total investments, that's concentration risk creeping in.
You're close to your goal: As a goal deadline approaches (retirement, a home purchase), shifting toward safer assets matters more than staying at your original allocation.

What to Check in an Annual Portfolio Review

A rebalancing check is only one part of a full review. Use the same annual sitting to also confirm:

Current allocation vs target: The core rebalancing check — how far has the equity:debt split (and sub-splits within equity) drifted from target.
Fund performance vs category peers: A fund that has consistently lagged its category average over 3+ years may be worth replacing, not just rebalanced around.
Goal timelines: Confirm each goal's time horizon hasn't shortened enough to warrant shifting that portion toward safer assets.
Insurance and emergency fund adequacy: Income changes or new dependents can mean existing cover or buffer amounts are now undersized.

Common Mistakes to Avoid

Rebalancing too frequently: Checking and adjusting every month adds transaction costs and taxes without meaningfully improving outcomes for a typical long-term investor.
Always selling instead of using new money first: Defaulting to "sell and shift" even when regular contributions could correct the drift creates unnecessary tax events.
Ignoring the tax impact of selling equity held under a year: Short-term capital gains are taxed at a higher rate, so the timing of a sale-based rebalance matters, not just the decision to do it.
Treating rebalancing as the whole review: Only checking the equity:debt split while skipping fund performance, goal timelines, and insurance adequacy misses other things that also need periodic attention.

Key Takeaway: Market movements alone can drift your portfolio away from its intended allocation. An annual review is sufficient for most individual investors — rebalancing with new money first, and selling only when needed, keeps it tax-efficient. Use the same annual check-in to review fund performance, goal timelines, and cover adequacy, not just the allocation split.

Frequently Asked Questions

How often should I actually rebalance?

Once a year is a common, low-effort approach for most individual investors. More frequent rebalancing (monthly or quarterly) tends to rack up more transaction costs and taxes without meaningfully improving results for a typical long-term investor.

Does rebalancing always mean selling equity?

No — if equity has grown to be overweight, you can redirect new SIP contributions entirely into debt for a while instead of selling anything, letting new money do the rebalancing without triggering a tax event.

Is there a threshold that triggers rebalancing, rather than a fixed schedule?

Some investors use a "threshold" approach instead of a calendar date — rebalancing only when an asset class drifts more than a set amount (say 5-10 percentage points) from its target, whichever comes first.

Does rebalancing apply within equity too, not just equity vs debt?

Yes — the same idea applies between large-cap, mid-cap, and small-cap allocations within your equity portion, since these also grow at different speeds and can drift from your intended mix over time.

How do I figure out exactly how much to sell or redirect?

Multiply your total portfolio value by the target percentage for the underweight asset to get its target rupee amount, then subtract what you currently hold in it — that difference is the shortfall to cover, either through new contributions or a sale-and-shift.

What else should I check besides the allocation split during a review?

Use the same sitting to check whether any fund has consistently lagged its category peers, whether goal timelines have shifted, and whether insurance cover or the emergency fund still matches your current income and responsibilities.