Bond Index Remark : 1. Government Bond Indices are calculated from government Loan Bond (LB) only. 2. The base date of sub group 4 's index is 12 March 1999. The base date of other indices is 4 January 1999. 3. The net total return indices are calculated by applying the withholding tax rates to accrued interest and coupon payments on all coupon bonds. The tax rates may change from time to time due to changes to the withholding tax rate applicable in Thailand. The current and historical withholding tax rate is 15%. 4. The base date of the net total return indices is 20 August 2019. 5. ThaiBMA Bond Index represent Government Bond Index, SOE (G) Bond Index and SOE (NG) Bond Index. 6. For the manual of ThaiBMA bond Index , please click here. Remark : The Investment Grade Corporate Bond Index has been obsoleted since 31 December 2021. ThaiBMA recommends to use the Mark-to-Market Corporate Bond Index instead.