Discount rate
How CBN quotes T-bill returns. Discount rate × tenor gives you the gap between purchase price and face value — NOT your true annualised yield. Yield is always higher than discount rate.
When you think of the Central Bank of Nigeria (CBN) announcing a new Monetary Policy Rate (MPR), you might wonder how this affects your investment in Treasury Bills (T-bills). The discount rate is a crucial concept here, as it is the rate at which these T-bills are sold. Essentially, it's the price you pay to buy a T-bill today, knowing that you will get a higher amount back when it matures. For example, if the discount rate is 25%, buying a ₦1,000 T-bill means you pay less than ₦1,000 upfront, with the difference between your purchase price and the ₦1,000 face value being the interest earned over the investment period.
To put it simply, the discount rate is not the same as the annualized yield. The yield is the actual return you earn on your investment over a year. To calculate this, you multiply the discount rate by the number of days the bill runs, then divide by 365 and add one. This gives you the price you need to pay to buy the bill today. For instance, if you buy a 91-day bill with a discount rate of 25%, you'll pay less than ₦1,000, and the difference is your interest for holding the bill for 91 days.
In the Nigerian context, the discount rate is directly influenced by the CBN's MPR. When the CBN increases the MPR, it usually results in higher discount rates on T-bills. This is because investors demand higher returns to compensate for the increased risk. Say the MPR is increased to 27.50%; you might see discount rates on T-bills rise to 27.50% or more. This means the price you pay for a T-bill today will be lower, but your potential yield will be higher.
Understanding the difference between the discount rate and the annualized yield is essential for making informed investment decisions. For example, if you invest in a T-bill with a discount rate of 25% and a 91-day tenor, your annualized yield will be higher than 25%. This is because the yield takes into account the gap between the purchase price and the face value over the entire year.
Knowing how the discount rate works and how it translates to your actual returns can help you make better investment choices. It allows you to compare the attractiveness of different investment options, whether it's T-bills, stocks on the Nigerian Exchange (NGX), or other financial instruments. This understanding is crucial for maximizing your returns while managing risk effectively.