It's unclear to me how this will work - at the moment, if I understand correctly, most defined contribution pensions are passed on free of inheritance tax to beneficiaries, but if the person who died was over 75, then any sum taken out of the pension by the beneficiary is added on to the beneficiary's income and taxed at income tax.
Will IHT be on top of this?
Assuming £1M non-pension estate and £1M nil rate band including primary residence/spousal transfer, IHT would leave 60% of the original pension pot - and then that remainder would be further taxed at up to 45% if any money is actually taken out by the beneficiary?
Whether or not you agree with inheritance tax on pensions, surely once the money is taxed (whether at income tax rates or inheritance tax rates) it should not be taxed again to be accessible to a beneficiary?
If Rachel Reeves is proposing double taxation at an effective 67% rate then it would be a major disincentive to pay into DC pensions if you even think your estate could possibly get close to the IHT nil rate threshold.