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![Flat Price, Accrued Interest, Full Price - Bond | CFA Level 1 - AnalystPrep (2) Flat Price, Accrued Interest, Full Price - Bond | CFA Level 1 - AnalystPrep (2)](https://i0.wp.com/cdn.analystprep.com/cfa-level-1-exam/wp-content/uploads/2021/07/08091332/cfa-blog-banner-default.jpg)
fixed-income
27 Sep 2019
When investors purchase shares, they pay the quoted price. However, for bonds, there can be a difference between the quoted price and the price paid.
Full Price
When a bond is between coupon payment dates, the price has 2 components: the flat price (PVFlat) and the Accrued Interest (AI). The sum of these two is the full price (PVFull), also called invoice or dirty price.
$$ PV^{ Full } = PV^{ Flat } + \text{Accrued interest} $$
Flat Price
The flat price, on the other hand, is the full price minus the accrued interest. The flat price is generally the quoted price between bond dealers. It does not include any interest accrued between the scheduled coupon payments for the bond.
The reason for using the flat price is to avoid misleading investors since accrued interest does not change the yield-to-maturity. It is the flat price that is “pulled to par” along the life constant yield price line.
Accrued Interest
The accrued interest is the proportional share of the next coupon payment. Suppose coupon payment has “T” days between payment dates and “t” days have passed from the last payment date, then the accrued interest:
$$AI=\frac { t }{ T } \times PMT$$
Where:
t/T = fraction of the coupon period that has passed from the last payment date; and
PMT = coupon payment for the period
Day-Count Conventions
Actual/actual convention
Regarding bond day-counting, there are 2 major methods: Actual-actual and 30/360.
The first “actual” refers to theactual number of days since the last coupon date. The second one refers to the actual number ofdaysin a coupon period. This includes weekends, holidays, and leap days.
For example, let’s assume that a semi-annual payment bond pays interest on 15th June and 15th December of each year. To compute the accrued interest for settlement as of 27th July, we would consider the actual number of days between 15th June and 27th July (t = 42 days). This number would be divided by the actual number of days between 15th June and 15th December (T = 183 days) and then multiplied by the coupon payment. With a coupon rate of 5.25%, the accrued interest would be 0.60246 per 100 of par value.
$$\text{Accrued interest}=\frac { 42 }{ 183 } \times \frac { 5.25% }{ 2 } =0.60246$$
30/360 day-count convention
The 30/360 convention is often used for corporate bonds. It assumes that each month has 30 days (even though some months actually have 31 days and February has 28 or 29 days) and that a full year has 360 days.
As we did earlier, let’s assume that a semi-annual payment bond pays interest on 15th June and 15th December each year. To compute the accrued interest for settlement as of 27th July, we would take into account a total of 15 days in June and 27 days in July (t = 42 days). This number would be divided by 180 – the number of days between 15th June and 15th December, assuming every month has 30 days (T = 6 × 30), and then multiplied by the coupon payment. With a coupon rate of 5.25%, the accrued interest would be 0.6125 per 100 of par value.
$$\text{Accrued interest}=\frac { 42 }{ 180 } \times \frac { 5.25% }{ 2 } =0.6125$$
The full price of a fixed-rate bond between coupon payments given the market discount rate per period (r) can be calculated as:
$$PV^{ Full }=PV×(1+r)^{ t/T }$$
Question
Assuming a market discount rate of 4.5%, the full price of a semi-annual bond with a present value (PV) of 102 and 90 days of accrued interest is closest to:
- 101.955
- 103.135
- 104.235
Solution
The correct answer is B.
Since the bond coupons are paid semi-annually, the time (T) between coupon payments is 180 days.
PVFull = 102 × (1.0225)90/180 = 103.1411
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