You could to sell the properties before you die to reduce your IHT liability on your portfolio. You will then be required to pay Capital Gains Tax if the value of the properties have appreciated since you purchased them. CGT on the gains made on residential property in the 2019/2020 tax year is either at 18% or 28% on any gain made over £12,000 (depending on whether you’re a standard rate or higher rate taxpayer). Thereafter, the cash from the sale will still incur IHT.