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How do UK Gilts interest rates and repayments work?
The name of the Gilt states the redemption date, but not the original issue date. A gilt with 8.75% yield and close to its redemption date may have been issued at a time when interest rates were indeed close to 8.75%. For example in the early 1990s, the UK inflation rate was about 8%. One reason for preferring high or low coupon gilts is the trade off between capital gains and income, and the different taxation rules for each. If you buy a gilt and hold it to its maturity date, you know in advance the exact price that it will be redeemed for (i.e. £100). You may prefer to take a high level of income now, knowing you will make a capital loss in future (which might offset some other predictable capital gain for tax purposes) or you may prefer not to take income that you don't need right now, and instead get a guaranteed capital gain in future (for example, when you plan to retire from work). Also, you can use the change in the market value of gilts as a gamble or a hedge against your expectation of interest rate changes in future, with the "government guaranteed" fallback position that if your predictions are wrong, you know exactly what return you will get if you hold the gilts to maturity. The same idea applies to other bond investments - but without the government guarantee, of course.