Rebalancing of Portfolio

Drift in asset‑class weights occurs naturally as market prices move. If equities outperform bonds, the equity proportion may rise far above the client’s risk tolerance, exposing the portfolio to higher volatility than intended.

Rebalancing restores the original risk profile by selling overweight assets and buying underweight ones. This disciplined approach prevents the portfolio from becoming unintentionally aggressive or overly conservative.

From an exam perspective, remember that rebalancing is not about chasing performance; it is about maintaining the strategic allocation set in the investment policy statement (IPS). Questions often ask you to choose the best reason for rebalancing, and the correct answer will reference risk control or alignment with the IPS.

• Risk alignment – keeps portfolio within the client’s risk capacity.
• Strategic consistency – adheres to the IPS and target allocation.

Two common triggers are used in practice: a time‑based schedule (quarterly, semi‑annual, or annual) and a threshold‑based rule (e.g., when any asset class deviates by more than 5% from its target weight). SEBI does not prescribe a specific frequency, but the distributor must document the chosen policy in the client agreement.

Time‑based rebalancing is simple to implement and easier to audit, while threshold‑based rebalancing reacts to market moves more quickly. The exam often presents a scenario and asks which trigger is more appropriate for a high‑net‑worth client with a low risk‑tolerance – the answer is usually a tighter threshold.

Always link the chosen trigger back to the client’s risk profile and the IPS. If the IPS mentions “rebalance when drift exceeds 3%,” that exact figure will be the correct answer in a multiple‑choice question.

There are three primary methods used by PMS distributors in India:

Full Rebalancing – Adjust every asset class back to its exact target weight in one transaction cycle.

Partial Rebalancing – Only trade the asset classes that have breached the pre‑defined deviation limit, leaving others untouched.

Cash‑Flow Rebalancing – Use new cash inflows or outflows to bring the portfolio closer to target without selling existing holdings, thereby reducing transaction costs.

Step 1 – Calculate current weights: For each holding, divide its market value by the total portfolio market value.

Step 2 – Compare with target weights as defined in the IPS. Identify assets that breach the chosen deviation threshold.

Step 3 – Determine trade amounts using the rebalancing trade‑amount formula (provided below). This tells you how much to buy or sell for each deviating asset.

Step 4 – Execute trades while considering market impact, transaction costs, and tax efficiency. Record the trade details in the client’s portfolio ledger.

Step 5 – Update records and communicate the new allocation to the client, confirming that the portfolio now aligns with the IPS.

SEBI does not prescribe a mandatory rebalancing frequency, but it requires PMS distributors to act in the best interest of the client and to disclose the rebalancing policy in the agreement. The distributor must maintain records of each rebalancing decision, including the rationale and cost analysis.

Under the NISM Series XXI‑A syllabus, candidates are expected to know that any material change in the portfolio’s risk profile must be communicated to the client, and the distributor should obtain consent if the change deviates from the agreed IPS.

Exam questions may present a scenario where a client complains about excessive trading. The correct answer will reference SEBI’s “best‑interest” duty and the need to justify rebalancing frequency against cost.

One frequent error is rebalancing solely based on absolute performance, i.e., selling winners and buying losers without considering the target allocation. This practice can unintentionally increase risk.

Another mistake is ignoring tax implications. In India, selling equity holdings held for less than one year attracts short‑term capital gains tax, which can erode the benefit of rebalancing. The exam often asks which factor should be considered first – the answer is the client’s IPS, followed by tax efficiency.

Lastly, failing to document the rebalancing decision can lead to compliance breaches under SEBI regulations. Always record the trigger, calculation, and client communication.

Rebalancing can enhance risk‑adjusted returns by preventing overweight positions that increase portfolio volatility. Academic studies show that a disciplined rebalancing strategy often yields a higher Sharpe ratio compared to a buy‑and‑hold approach.

However, the benefit is not guaranteed. High transaction costs, bid‑ask spreads, and tax drag can offset the risk‑control advantage, especially for portfolios with frequent rebalancing. The exam may ask you to evaluate whether rebalancing adds value for a low‑turnover client – the correct answer will balance risk reduction against cost.

In practice, distributors use performance attribution tools to measure the net effect of rebalancing on the portfolio’s return after expenses. Understanding this helps you answer scenario‑based questions that involve cost‑benefit analysis.