Since then, the number of people paying inheritance tax each year had more than doubled.
Suggesting that the problem will only get more pronounced, Rachael Griffin, of the wealth manager Quilter, said Britain was facing a “demographic time bomb”.
She said: "We will see the death rate increase over a considerable period as the baby boomer generation ages and ultimately passes on.
Experts have warned it will be families not the deceased who are impacted most from the inheritance tax threshold freeze
"We recently saw a surge in inheritance tax receipts as a result of an increased death rate from Covid, so this would give an indication of what is likely to come."
A Government spokesman said: "The vast majority of estates do not pay inheritance tax – more than 93 per cent of estates are forecast to have zero IHT liability in the coming years and the tax raises more than £7billion a year to help fund public services millions of us rely on daily.
"Estates of surviving spouses and civil partners can pass on up to £1million without an IHT liability – significantly more than the value of the average UK home of £286,000."