📚 PASS Investment Adviser (Level 1) Difficulty: Beginner ℹ️ Info   ~5 min read
📌 Chapter 9.4 — Pricing of Bond

Imagine you are a credit analyst at a Mumbai-based brokerage firm, tasked with evaluating a G-Sec purchase for a client’s portfolio. You pull up the current quote for a 7.26% 2033 Government of India bond on the Negotiated Dealing System-Order Matching (NDS-OM) platform. The screen displays a specific price, but your financial model requires the total cash outflow your client must settle by T+1.

You realize that simply multiplying the face value by the quoted price is insufficient, as the purchase is occurring exactly midway between two semi-annual coupon payment dates.

In the Indian debt market, bonds are quoted using a ‘clean price’ to standardize valuation across different securities regardless of when the last coupon was paid. This convention removes the ’noise’ of accrued interest, allowing analysts to compare the yield-to-maturity (YTM) of different bonds on a like-for-like basis. If the price included accrued interest, an older bond trading just before a coupon payment would appear artificially expensive compared to a newly issued bond, making comparative analysis nearly impossible for market participants.

However, the ‘dirty price’—or the full invoice price—is what actually changes hands during settlement. This is the sum of the clean price and the accrued interest for the number of days elapsed since the last coupon payment. In India, bond conventions typically use the 30/360 or Actual/365 day-count basis depending on the specific security type, such as corporate bonds versus government securities.

Forgetting to account for this difference can lead to a significant miscalculation of the initial investment outlay, potentially leading to a cash flow shortfall in the client’s settlement account.

Consider an analyst reviewing a corporate bond with a face value of ₹1,000,000 trading at a clean price of ₹980. If 45 days have passed since the last coupon payment in a 360-day year, the seller is entitled to the interest earned during that period. The buyer must pay the clean price plus the accrued interest, which is calculated as the coupon rate multiplied by the time fraction.

Failing to differentiate between these two figures in your valuation model will result in an inaccurate Internal Rate of Return (IRR) for your client’s portfolio. Mastery of these conventions is not merely a theoretical requirement for your exam; it is a fundamental operational necessity for anyone executing trades in the Indian debt capital market.1

Nuance

⚠️ Nuance
Candidates often erroneously believe that the clean price is the amount that must be transferred to the clearing corporation during settlement. In reality, the clean price is strictly a valuation tool used for quoting and yield comparisons. A professional analyst must always mentally reconcile the difference between the ‘market quote’ (clean) and the ‘settlement obligation’ (dirty) to avoid liquidity errors in trade execution.

Check Your Understanding

Practice Question 1

An analyst is evaluating a G-Sec listed on NDS-OM. The bond is quoted at ₹102.50. If the bond is purchased 60 days after the last coupon payment, what is the primary purpose of this clean price quote?

Practice Question 2

Which of the following statements correctly identifies the relationship between clean price, dirty price, and accrued interest?

This is a companion read for Section 9.4 — Pricing of Bond from PASS Investment Adviser (Level 1) by Akhilesh Gururani, available on Amazon Kindle.

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  1. The day-count convention determines how interest accrues; the 30/360 method assumes twelve 30-day months, while Actual/365 counts the exact number of days elapsed. Selecting the correct convention is vital for accurate interest calculation in debt instruments. ↩︎