Hi ACTS,
US government bonds, sometimes known as T-bills or treasury bills are generally taxed as income rather than capital gains.
The return is paid at maturity rather than regular interest payments. In the UK, these are known as deeply discounted securities, with the discount being the difference between the price at which they were issued and the price received at maturity.
On a foreign investment the income is the difference between the purchase and redemption price after each has been converted to sterling on the day the transactions took place, so includes any foreign exchange gains. Losses cannot be deducted.
Have a look at
SAIM3010 - Deeply discounted securities: introduction for more information.
Loss relief on deeply discounted securities was largely abolished on 27/03/23, as explained at SAIM3080 - please see link below.
There is an exception to this rule for government securities and there is also a special rule that relates to securities held before the above date.
SAIM3080 - Deeply discounted securities: taxation: losses Losses: listed securities held since 26 March 2003.
You are correct with your dates.
Thank you.