(1) The estimated annualised yield is calculated based on the investment price set by the investor (buy and sell prices), as well as the specific number of days the bond is held, to determine the annualised rate of return for the bond during the holding period. This rate of return only considers capital gains (or losses) and interest income during the holding period.

(2) The Yield to Maturity (YTM) of a bond refers to the expected annualised rate of return if the bond is held to maturity, and all interest payments are reinvested at the same rate throughout the period. YTM is a more comprehensive method of measuring bond yields as it takes into account all future interest payments and the repayment of principal at maturity, assuming that all interest can be reinvested at the same rate as the YTM.

(3) Reasons for the discrepancy between the estimated annualised yield and YTM may include:
Reinvestment assumption: YTM assumes that all interest is reinvested at the same yield, while the estimated annualised yield does not make this assumption.
Holding period: The estimated annualised yield is calculated based on the actual number of holding days, while YTM assumes the bond is held to maturity.
Treatment of principal at maturity: YTM takes into account the repayment of principal at maturity, while the estimated annualised yield typically only focuses on the difference between the buy and sell prices.
Market interest rate fluctuations: Changes in market interest rates can affect the sell price and thus impact the estimated annualised yield, but YTM is a fixed value calculated at the time of purchase based on market conditions at that time.

(1) Select the bond you want to trade in the bond list or in the search results, and then tap the Buy button on the bond details page.

(2) Enter the nominal value and the buying price you desire. You can refer to the "Indicative Ask Price". (This price is for reference only and may differ from the actual transaction price.)

(3) Tap the Buy button, enter your transaction password, and submit the order. Please wait patiently for the order to be matched. The transaction price will not exceed the order price.

Since bonds are traded over the counter and brokers are needed to match orders, transaction time and prices are influenced by various factors such as daily market liquidity and counterparty conditions. You can try to increase the buying price or decrease the selling price, or wait patiently for the right counterparty or market price.

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No, it can be held until maturity or sold in advance at any trading time.

The accrued interest on bonds has 2 parts: Firstly, the interest paid to the seller at the time of purchase. The other is the interest accumulated during the holding period with interest being earned for each holding day. 

Both parts of the interest will be paid to investors on the interest payment date. Investors can estimate whether they will receive interest on the next interest payment date based on whether the accrued interest they hold is approximately equal to for example, semi-annual interest.

Additionally if the bondholder sells the bond before the interest payment date, the buyer should pay the accrued interest to the seller.

In most cases, purchasing US Treasuries does not require paying taxes for non-U.S. residents.

However, specific tax regulations may vary depending on individual circumstances and the type of US Treasuries invested in. Therefore, it is advisable to consult with tax professionals to obtain accurate tax information.