How Accrued Interest Affects NAV and Fund Performance

What is Accrued Interest?

Accrued interest is the portion of interest earned on a fixed‑income security that has not been paid to the holder. It arises because many bonds and money market instruments pay interest at set intervals, such as semi‑annually or quarterly. Interest continues to grow between these scheduled payments. If an investor purchases or sells such a security in the secondary market, accrued interest ensures the interest earned up to the trade date is correctly recognised.

In mutual funds, especially debt and hybrid funds, accrued interest affects the valuation of underlying bonds. Fund managers note this interest, so the net asset value (NAV) shows real economic value, while trustees monitor compliance. Understanding accrued interest helps investors follow NAV movements and cash flows more clearly.

How Accrued Interest Works in Mutual Funds

Interest continues to accumulate even between scheduled payments, affecting fund valuation and transactions.

• Interest Accrual Between Payment Dates: Fixed‑income securities typically pay interest periodically. For example, a government bond may pay interest every six months. However, interest does not stop accruing between those dates. Accrued interest shows the part of a coupon that grows daily before the following scheduled payment date arrives.
• Impact on Purchases and Sales: If a mutual fund buys a bond between coupon payment dates, it must pay the seller the accrued interest along with the bond’s price. This amount is paid by the fund to cover the interest the seller has earned so far. When the next coupon arrives, your fund gets the total amount, and the interest record resets.
• Influence on NAV: Accrued interest is included in a fund’s daily valuation. NAV increases as interest accrues daily. When coupon payments are received, the accrued interest component is replaced by cash, so the NAV typically does not change due to the coupon alone. This system makes sure that investors joining or leaving the fund receive or pay the correct portion of interest earned up to that date.

Calculation of Accrued Interest

Keeping track of accrued interest provides fair accounting for both investors and fund managers.

1. Basic Formula

   Accrued interest is what you calculate with this formula:

   Accrued Interest = (Coupon Rate × Principal × Days Since Last Payment) ÷ Days in Period

   This formula calculates the interest proportionally based on the number of days since the last coupon payment. In debt funds, the principal represents the bond’s face value, and the coupon rate is the yearly interest it earns.

2. Day Count Conventions

   Different financial instruments follow different day count methods, which influence the interest accrual.

   • The Actual/Actual method counts the actual number of days in the period and the year.
   • 30/360 assumes 30‑day months and a 360‑day year.
     Mutual funds use rules written in every security’s terms for accurate interest distribution.

3. Example in Mutual Fund Context

   Suppose a bond in a mutual fund has a face value of ₹10,00,000 with a 7% yearly coupon. Interest is paid two times each year. If 90 days have passed since the last payment in 180 days, the interest that has accumulated is:

   Accrued Interest = (0.07 × 10,00,000 × 90) ÷ 180 = ₹35,000

   This ₹35,000 will show in the fund’s value until the next coupon payment arrives.

Why Accrued Interest Matters to Investors

Knowing how accrued interest works helps you understand fund performance and make decisions.

• Fair Pricing of Securities: Accrued interest makes sure that buyers compensate sellers properly when securities are transferred. Without using accrual accounting, someone could miss out on interest that has already been earned.
• Accurate Fund Valuations: When NAV calculations include accrued interest, they show the real returns of the underlying bonds. This level of accuracy is essential when evaluating performance and comparing funds.
• Better Performance Measurement: Those analysing yield and total return may find it useful to consider how accrued interest forms part of their income. Awareness of accruals helps distinguish changes in price from income earned.
• Tax Implications: In many jurisdictions, interest income and capital gains are taxed differently. However, tax treatment depends on local regulations and the mutual fund structure. Accrued interest may affect how income is classified for tax purposes when securities are sold within a fund or by the investor.