This paper gives a brief summary of the structure of inheritance tax before looking at the debates there have been about the tax in recent years.Jump to full report >>
Inheritance tax (IHT) is levied on the value of a person’s estate at the time of their death. The tax is charged at 40% above the tax-free threshold, which is £325,000 for 2017/18. In 2015/16 the tax raised £4.7 billion; receipts are forecast to be £5.0 billion in 2017/18. It is estimated that the tax was paid on 23,000 estates in 2014/15, equivalent to around 4% of all deaths. 
When calculating the taxable value of a person’s estate, transfers made out of someone’s estate within seven years of their death are included. There are some gifts which one can make in the last seven years of one’s life which do not attract tax. In addition certain gifts are exempt from tax irrespective of their size, and irrespective of whether they are made during one’s life, or made under the terms of one’s will.
From the late 1990s there was a steady growth in the receipts from IHT and the numbers of estates liable to pay it, strongly linked with the growth in house prices. By the middle years of the decade commentators were predicting that very many more families would have to make provision to pay for the tax in future, though even at this point, at the peak of the UK housing market, tax was paid on around 6% of all estates at death. In 2007 the Labour Government responded to these concerns by introducing a new transferable allowance for spouses and civil partners. The cost of the new relief was considerable – about £1 billion in 2008/09 – though less than the Conservative Opposition’s proposal for a new £1m tax-free threshold – which, at the time, was estimated to cost £3.1 billion. By comparison, total receipts from the tax in 2007/08 were £3.8 billion.
Subsequently receipts from this tax dropped quite sharply, with the onset of the recession and the associated slump in house prices. In addition public debate about the tax system moved on, with relatively little attention being paid to IHT.
In its agreement published after the election, the Conservative-Liberal Democrat Coalition Government made a number of tax proposals including a ‘substantial’ increase in the income tax personal allowance from April 2011. The agreement went on to state that the new Government would “further increase the personal allowance to £10,000, making real terms steps each year towards meeting this as a longer-term policy objective”, and that it would “prioritise this over other tax cuts, including cuts to Inheritance Tax.” The new Government’s first Budget in June 2010 did not contain any proposals for reforming IHT, and over the five year Parliament the tax was left largely unchanged. In its 2011 Budget the Government announced that the tax-free threshold would be frozen at £325,000 until April 2015, and in the 2013 Budget it confirmed that the threshold would remain frozen at this level until April 2018.
Over this period annual receipts slowly grew, with the recovery in the economy and growth in house prices, which in turn lead to more interest in the tax and debate as to its possible reform. In its manifesto for the 2015 General Election the Conservative Party stated that in government, “we will take the family home out of tax for all but the richest by increasing the effective Inheritance Tax threshold for married couples and civil partners to £1 million, with a new transferable main residence allowance of £175,000 per person.” In the Conservative Government’s first Budget on 8 July, the then Chancellor George Osborne announced that from April 2017 an additional nil-rate band would apply on transfers on death of a main residence to a direct descendant. In this context a direct descendant is “a child (including a step-child, adopted child or foster child) of the deceased and their lineal descendants.” Initially the band would be set at £100,000. The ‘main residence nil-rate band’ would be subject to a taper, for any estate with a net value of more than £2m; the band would be withdrawn by £1 for every £2 the estate exceeded this threshold. If someone downsized or ceased to own a home before they died, the additional nil-rate band could still be claimed on assets of an equivalent value, if passed on death to direct descendants. This provision applies if someone has downsized or ceased to own a home on or after 8 July 2015.
In his Budget Mr Osborne also announced that the existing nil-rate band will be frozen at £325,000 at least until 2020/21, while the main residence nil-rate band would rise by £25,000 each year, to reach £175,000 in 2020/21. As with the existing nil-rate band, any unused fraction of the main residence nil-rate band may be transferred to a surviving spouse or civil partner. The Budget report noted that, given this, “the effective inheritance tax threshold will rise to £1m in 2020/21.”
Provision to introduce the new nil-rate main residence allowance from April 2017, and to increase it over 2017/18 to 2020/21, was made by ss9-10 of the Finance (No.2) Act 2015. The annual Exchequer cost of the new main residence nil-rate band is forecast to rise from £265m in 2017/18 to £725m by 2021/22. No other major reforms have been made to IHT since then.
 HMRC, Statistics: Numbers of taxpayers and registered traders, April 2017. ONS, Deaths registered by area of usual residence, UK, 2017 (figure for calendar 2014). For details of the percentage share in earlier years see, HMRC, Inheritance Tax Statistics 2013/14, July 2016 p7 (Figure 2).
 HM Government, The Coalition: our programme for government, 20 May 2010 p30. See also, Income tax : increases in the personal allowance (2010-15), Commons Briefing Paper 6569, 17 June 2015.
 Budget 2011, HC 836 March 2011 para 2.58
 Budget 2013, HC 1033 March 2013 para 2.76
 For details see, HM Revenue & Customs, Inheritance tax: main residence nil-rate band and the existing nil-rate band: tax information & impact note, 8 July 2015
 Provision with regard to the new nil-rate band where someone has downsized their home was included in Finance Act 2016 (specifically section 93 & schedule 15).