cgt payable by reference to an event which gives rise to a charge of cat is available for credit against such cat, if on or after 6/4/88 gift tax or inheritance tax is charge on a property and the same event constitures a disposal for cgt purposes the cgt in so far as it has been paid shall be deducted from the net gift tax or inheritance tax as a credit against the same provided that the amounts deducted shall be equal to the lesser of the net gift or inheritance tax or cgt under FA 85 Section 63, FA 88 section 66 and CATCA section 104
where cat is chargable more then once in respect of the same property on the same event the net tax payable on an earlier event will be allowable as a credit tax on the later event FA 85 section 62 and CATCA s105
hope this helps you