Advanced Financial Management · Portfolio Management

Portfolio Revision and Investment Strategies for CA Final AFM

Updated 5 October 2026 · Fact-checked

Portfolio revision means changing your holdings as markets and goals change. Active strategies trade on forecasts; passive ones hold or track an index. Formula plans use fixed rules: constant rupee value, constant ratio, rupee cost averaging and CPPI. To solve, identify the rule, compute target amounts, then work out the buy or sell.

Understand Portfolio Revision and Investment Strategies

A portfolio does not stay at its original mix. Prices move, your goals change, and new information arrives. Portfolio revision is the process of changing the holdings to bring the portfolio back in line with your objective. It involves selling some securities, buying others, or changing the split between asset classes.

There are two broad approaches. An active strategy uses forecasts and analysis to pick securities and time the market. It trades often, so it has higher transaction costs and research costs. It only pays if the investor can beat the market after those costs. A passive strategy assumes the market is reasonably efficient. You hold a well-diversified portfolio, often an index fund or index-mirroring basket, and trade rarely. Costs are low and returns track the market.

Formula plans sit between the two. They are mechanical rules, set in advance, that tell you when to shift money between an aggressive part (equity) and a conservative part (bonds or debt). They remove emotion and forecasting. Their logic is: sell some equity when prices rise, buy when prices fall. The main plans are the constant rupee value plan (equity value is kept fixed), the constant ratio plan (the equity:debt ratio is kept fixed) and the variable ratio plan (the ratio itself changes with market levels). Formula plans need a trigger, such as a fixed percentage move, to start a revision.

Rupee cost averaging is a related idea. You invest a fixed amount at regular intervals regardless of price. You get more units when the price is low and fewer when it is high. So your average cost per unit is lower than the simple average of the prices, although it does not guarantee a profit.

Constant proportion portfolio insurance (CPPI) works in the opposite direction. You fix a floor, the minimum value you want to protect. The cushion is the portfolio value minus the floor. You put a multiple of the cushion in equity and the rest in the safe asset. When the market rises, the cushion grows and you buy more equity. When it falls, the cushion shrinks and you sell equity. So CPPI buys on rises and sells on falls. A constant ratio plan does the reverse.

Key rules to remember

Constant ratio plan target: Target equity = Total portfolio value × equity ratio; Target debt = Total portfolio value × debt ratio; Revise when the actual ratio moves beyond the trigger. Equity rises: sell equity and buy debt. Equity falls: buy equity and sell debt.
Constant rupee value plan: Target equity = fixed rupee amount; Debt = Total portfolio value − fixed equity amount; Any equity gain above the fixed amount moves to debt. Any shortfall is topped up from debt.
Rupee cost averaging: Average cost per unit = Total amount invested ÷ Total units bought; With equal amounts invested each period, this is the harmonic mean of prices, which is never above the arithmetic mean of the prices.
CPPI cushion: Cushion = Portfolio value − Floor; The floor is the value you want to protect. If a question gives a guaranteed amount at a future date, the floor is usually its present value at the risk-free rate.
CPPI equity exposure: Equity exposure = Multiplier (m) × Cushion; If this exceeds the portfolio value, a no-borrowing question caps equity at 100% of the portfolio.
CPPI safe asset: Investment in safe asset = Portfolio value − Equity exposure; Use this to check that the two parts add back to the total.
Payoff shape: Constant ratio plan: concave payoff. CPPI: convex payoff.; Constant ratio does better in oscillating, range-bound markets. CPPI does better in strongly trending markets and protects against steep falls, but does badly in whipsaw markets.

How to solve Portfolio Revision and Investment Strategies questions

Use this sequence for any numerical or theory question on portfolio revision and formula plans.

1Identify the plan named or implied: active, passive, constant rupee value, constant ratio, variable ratio, rupee cost averaging or CPPI.
2List the starting split between equity and debt, and the parameters: ratio, fixed amount, floor, multiplier, trigger.
3Update the value of each part for the market move. Change only the asset that moved; keep the other unchanged unless told.
4Add the new values to get the new total portfolio value.
5Compute the target amounts using the plan's rule. For CPPI, find the cushion first, then multiply by m.
6Find the revision: target minus current for each asset. Equity sale equals debt purchase, so the two sides must match.
7Check that the new equity and debt add up to the portfolio value. State the action in words: sell or buy, and how much.
8Add a one-line interpretation if asked: the type of market where the plan works well, or its limitation.

Quickest way: Four-line table method

When to use it: Use this for any multi-step revision question where the market moves in two or more stages.

Draw a small table with columns: Equity, Debt, Total.
Fill the opening row. Then for each market move, write a row for 'after move' and a row for 'after revision'.
In the revision row, write the target equity first (ratio × total, or m × cushion), then debt as total minus equity.
The difference between the 'after move' equity and the 'after revision' equity is the trade. Confirm that debt changes by the same amount in the opposite direction.

Common mistakes in Portfolio Revision and Investment Strategies

Applying the CPPI multiplier to the whole portfolio instead of the cushion.
Students confuse CPPI with a constant ratio plan, where the ratio is applied to the total.
Fix: Always compute cushion = portfolio value − floor first. Equity = m × cushion. Write it as a separate line.
Selling equity when the market rises under CPPI.
Students carry over the constant ratio logic of 'sell high, buy low'.
Fix: Remember: CPPI buys on rises (cushion grows) and sells on falls (cushion shrinks). Constant ratio does the opposite.
Not updating the floor or portfolio value after each stage in a multi-stage problem.
Students reuse the opening total for the second revision.
Fix: Use the revised total after each market move. Keep the floor unchanged unless the question says it grows at a risk-free rate.
Claiming that rupee cost averaging guarantees a profit or beats the market.
It is taught as lowering the average cost, and students overstate that.
Fix: Say only that average cost per unit is below the average price when equal amounts are invested. It does not remove loss if the price falls and stays low.
Revising after every small move and ignoring the trigger or transaction costs.
Students treat the plan as continuous.
Fix: Revise only when the question's trigger is crossed. Mention that frequent revision raises costs and may erase the benefit.
Letting CPPI equity exceed the portfolio value without comment.
The formula m × cushion can give a number larger than the portfolio when the cushion is big.
Fix: If borrowing is not allowed or not mentioned, cap equity at the portfolio value and put zero in the safe asset. State the assumption.

Worked examples

Example 1

Meera has a portfolio of ₹10,00,000 split 50:50 between equity and bonds. She follows a constant ratio plan and revises whenever the ratio moves away from 50:50. Equity rises 20% while bonds are unchanged. She revises. Then equity falls 10% and bonds are unchanged, and she revises again. Find the trade at each revision.

Show the solution

Opening: equity ₹5,00,000; bonds ₹5,00,000; total ₹10,00,000.
After the 20% rise: equity = 5,00,000 × 1.20 = ₹6,00,000; bonds ₹5,00,000; total ₹11,00,000. The ratio is now about 54.5:45.5, so a revision is triggered.
Target: 50% of ₹11,00,000 = ₹5,50,000 each. Sell equity worth ₹50,000 and buy bonds worth ₹50,000. After revision: equity ₹5,50,000; bonds ₹5,50,000.
After the 10% fall: equity = 5,50,000 × 0.90 = ₹4,95,000; bonds ₹5,50,000; total ₹10,45,000.
Target: 50% of ₹10,45,000 = ₹5,22,500 each. Buy equity of 5,22,500 − 4,95,000 = ₹27,500 and sell bonds worth ₹27,500.
Check: 5,22,500 + 5,22,500 = ₹10,45,000.

Answer: First revision: sell ₹50,000 of equity and buy ₹50,000 of bonds. Second revision: buy ₹27,500 of equity by selling ₹27,500 of bonds. Final portfolio: ₹5,22,500 in each asset, total ₹10,45,000. A constant ratio plan sells on rises and buys on falls.

Example 2

A fund has ₹1,00,00,000 and follows CPPI with a floor of ₹80,00,000 and a multiplier of 3. The floor stays constant. Equity falls 10% in the first period, then rises 20% in the second period. The safe asset earns nothing. Find the equity and safe asset holdings after each revision.

Show the solution

Opening: cushion = 1,00,00,000 − 80,00,000 = ₹20,00,000. Equity = 3 × 20,00,000 = ₹60,00,000. Safe asset = ₹40,00,000.
After a 10% fall: equity = 60,00,000 × 0.90 = ₹54,00,000. Safe asset ₹40,00,000. Portfolio = ₹94,00,000.
Revise: cushion = 94,00,000 − 80,00,000 = ₹14,00,000. Equity target = 3 × 14,00,000 = ₹42,00,000. Sell equity of 54,00,000 − 42,00,000 = ₹12,00,000. Safe asset becomes 40,00,000 + 12,00,000 = ₹52,00,000.
After a 20% rise: equity = 42,00,000 × 1.20 = ₹50,40,000. Safe asset ₹52,00,000. Portfolio = ₹1,02,40,000.
Revise: cushion = 1,02,40,000 − 80,00,000 = ₹22,40,000. Equity target = 3 × 22,40,000 = ₹67,20,000. Buy equity of 67,20,000 − 50,40,000 = ₹16,80,000. Safe asset becomes 52,00,000 − 16,80,000 = ₹35,20,000.
Check: 67,20,000 + 35,20,000 = ₹1,02,40,000.

Answer: After the fall: sell ₹12,00,000 of equity, leaving equity ₹42,00,000 and safe asset ₹52,00,000. After the rise: buy ₹16,80,000 of equity, leaving equity ₹67,20,000 and safe asset ₹35,20,000. CPPI sells on a fall and buys on a rise.

Exam tips

Write the plan name and its rule in one line before the working. Examiners award marks for identifying the plan.
In theory questions, compare plans on a single idea: constant ratio is concave and does well in oscillating markets, while CPPI is convex and does well in trending markets. Add the weakness of each.
For CPPI, show floor, cushion, multiplier, equity and safe asset as separate lines. Mention any cap on equity if the cushion times multiplier exceeds the portfolio.
For active vs passive, link each to market efficiency: active needs inefficiency to exploit, passive accepts efficiency. Add the cost difference.
In case-scenario MCQs, check which asset the market move applies to and whether the floor changes. Wrong options are often built from using the old portfolio value.

Practice questions from Portfolio Management

Portfolio Revision and Investment Strategies in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CMA FinalPortfolio Revision: Meaning and Need

Portfolio Revision and Investment Strategies: frequently asked questions

What is the difference between a constant ratio plan and a constant proportion portfolio insurance plan?

A constant ratio plan keeps the equity:debt ratio fixed and applies it to the total portfolio, so it sells equity when prices rise. CPPI sets equity at a multiple of the cushion above a floor, so it buys equity when prices rise. The first suits range-bound markets and the second suits trending markets.

How does rupee cost averaging work with a simple example?

You invest ₹10,000 each month. If the unit price is ₹10, ₹8 and ₹12, you buy 1,000, 1,250 and 833.33 units. Total units are 3,083.33 for ₹30,000, so the average cost is about ₹9.73, below the simple average price of ₹10. It lowers average cost but does not guarantee profit.

Is active or passive portfolio management better for CA Final answers?

Neither is always better. Active management tries to beat the market through selection and timing but has higher costs and needs the market to be inefficient. Passive management accepts market returns at low cost. State both with the cost and efficiency link, and say which fits the facts in the case.

What is the floor in CPPI if the question gives a guaranteed maturity value?

The floor is normally the present value of the guaranteed amount, discounted at the risk-free rate for the remaining time. If the question simply states a floor value, use it as given. Keep it constant unless the question says it grows.