Directional call

A bond portfolio manager who has a view on where interest rates are headed does not have to sit still. The most direct way to act on that view is to change the portfolio's duration — how sensitive its value is to interest-rate moves.

That deliberate change, based purely on a rate forecast, is a directional call. Expect rates to rise, and prices of existing bonds will fall — so the manager shortens duration to limit the damage. Expect rates to fall, and bond prices will rise — so the manager lengthens duration to capture more of the gain.

Section 19.3.1 defines it directly: whenever a portfolio manager takes a call on future interest rates — hardening (rising) or softening (falling) — and makes duration changes to maximise portfolio return, that is a directional call. If the manager expects rates to rise, she reduces the portfolio's duration to protect it from price risk. If she expects rates to decline, she increases duration to maximise the gain from rising bond prices.

The workbook frames this as the most common of the active, interest-rate-driven strategies, sitting alongside the barbell strategy (used when the direction of the rate move is uncertain, rather than confidently forecast one way) and roll-down and convexity plays. A directional call succeeds or fails entirely on whether the rate forecast turns out to be correct — it carries no natural hedge the way a barbell does.

Illustrative figures. A bond fund manages Rs 20,00,000 with a current portfolio duration of 5 years, in a market where the RBI is widely expected to hold rates steady.

The manager forms a view that inflation data due next month will force a rate hike, and takes a directional call: sells longer-dated bonds and buys shorter-dated ones, cutting portfolio duration from 5 years to 2.5 years.

Suppose rates then rise by 1 percentage point. Using the standard duration approximation (price change ≈ −duration × rate change):

• Unchanged 5-year duration portfolio: price falls by roughly 5 × 1% = 5%, a loss of about Rs 1,00,000 on Rs 20,00,000.
• Repositioned 2.5-year duration portfolio: price falls by roughly 2.5 × 1% = 2.5%, a loss of about Rs 50,000.

The directional call saved roughly Rs 50,000 of the loss — but only because the rate forecast was correct. Had rates instead fallen, the shortened-duration portfolio would have captured only half the price gain the original 5-year portfolio would have earned.

Chapter 19, section 19.3.1 (Interest Rate Driven Strategy), introduces the directional call as the first of the duration-management tactics, immediately before the barbell/bullet strategy, floaters, maturity extension, roll down and convexity. Expect a question asking whether a manager should raise or lower duration given a stated rate forecast, and one computing the approximate price impact of a duration change.

• Rising rate expectation → reduce duration; falling rate expectation → increase duration. Reversing this pairing is the single most common error on this topic.
• A directional call is a one-way bet on rate direction — unlike the barbell strategy, which is deliberately used precisely because the direction is uncertain.
• Duration management here is about the portfolio's overall interest-rate sensitivity, not about credit quality or issuer selection — those are separate active strategies (credit analysis) covered later in the same chapter.
• A correct directional call reduces loss or increases gain; it does not guarantee a profit — the portfolio can still lose money if the forecast is right but the repositioning is too small, or if other risks (credit, liquidity) dominate.