Currently the surviving spouse receives the inheritance tax free, and his/her zero tax allowance doubles to £650k.
Not that I doubted you, but I've been delving deeper into this. I'd like to confirm the correctness of your statement above, at least for a couple with UK only situs assets, no children, and, importantly, both are domiciled in the UK.
WARNING: This is my understanding, and as always, may be totally wrong.
My thoughts were always the same as your conclusion, but I always had difficulty finding an exact statement when assets are passed outright. Most explanations make a general statement and are not precise as to the
entire estate. I found this on one site:
"Married couples and civil partners are allowed to pass their estate to their spouse tax-free when they die. In other words, the surviving spouse can inherit the entire estate without having to pay Inheritance Tax." [bold mine]
https://www.moneyadviceservice.org.uk/en/articles/a-guide-to-inheritance-taxWe had a previous post that gave a simple make believe scenario, so let's expand it.
Case 1. Richard and Doreen have no children. Each have made a will leaving all their 'worldly goods' to the surviving spouse.
1. A home, valued at £900,000.
2. Joint bank accounts totalling £100,000.
3. Richard's solely owned bank accounts of £500,000.
4. Richard's car worth £5,000, and assorted personal items worth £7,000.
5. Jointly owned household items total £9,000
6 Richard's (DB) pension paying £6,000/ month. Doreen will receive 50% of the pension going forward after the Richard's death. Richard's US SS benefit paying £600/month for which Doreen would receive 100% (or the pre-WEP amount if WEP was applied).
Doreen, I believe, would receive all items (1,2,3,4,5,&6) free of UK IHT. Her estate, upon her death, would also have her original £325,000 NRB plus Richard's full NRB when she dies (total £650,000). Since there are no children, RNRB will not apply.
Case 2. Same as above, Richard's will leaves everything to Doreen but with the exception of £400,000 from his solely owned bank account being left to his sister Jane.
Doreen, I believe, would receive all items (1,2,4,5,&6) free of UK IHT. She would also receive £100,000 of item 3 (solely owned bank account) free of IHT. Jane would receive £400,000 from item 3. Richard's full NRB (£325,000) would go to cover this separate bequeath (it's not to a surviving spouse). IHT would be due on £75,000 of Jane's bequeath (400,000 - 325,000) at 40%.
Since Richard's full NRB has been used for Jane's bequeath, when Doreen dies, her only available NRB would be her original £325,000. If the value of the estate were to remain the exact same as at the time of Richard's death (minus the bequeath to Jane), it would be worth £1,121,000. I believe if Doreen leaves the full amount to her sister Charlotte, IHT would be due on £796,000 at 40 %.
Again, this is how I understand it, and it may well be wrong. I'm certainly open to any corrections (please).
I'll leave the fun part (inheritance to children) for others. For them, as well as others with assets in the US or more complicated estates I'll leave the following links:
US/UK Estate and Gift Tax Convention (the estate treaty)
http://uniset.ca/misc/us-uk1980.htmland
durhamlad's previous link
https://www.gov.uk/guidance/inheritance-tax-residence-nil-rate-bandand one person's general discussion of
"The Basics of US Estate and UK Inheritance Tax"http://www.buzzacott.co.uk/insights/the-basics-of-us-estate-and-uk-inheritance-tax