Depending on your country of residence, the exchange may be treated as a disposal of your current bond and an acquisition of the new one. This can give rise to capital gains tax, income tax, or withholding tax, even though you receive no cash. Any accrued interest paid to you may also be taxed.
Neither Eleving Group nor Mintos makes any representation about tax consequences for individual investors, and neither will gross up for any taxes applied. You should seek independent tax advice on your own position.