Recently, I read that the Belgium government was to pass laws in the very short interregnum between monarchs to allow for the new monarch to pay income tax. If, I understand matters correctly, this would not occur in the UK because there is no break in the monarchy because of the principle - 'The King is dead.Long live the King' concept ensures that there is no time when there is not a monarch.
Does this mean that the new monarch of Belgium has less powers than his father? I doubt it. Constitutional monarchs have to sign bills/laws passed by their equivalent of parliament or abdicate -if push comes to shove, as the saying goes.
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