Share price over-stated on IHT411 (and IHT overpaid as a result)

itm2

A few weeks ago I submitted IHT411 to HMRC, and paid all IHT due on my late mother's estate. I have just become aware that I mis-quoted the share price of one the shareholdings (£4.40 when it should have been 44p), and hence over-stated the value of the shares by £1,730. So I paid about £692 too much IHT on the overall estate. Probate has since been granted and the estate has been distributed (which is when I discovered my error).

Is it possible to retrospectively correct IHT411 to reclaim the overpaid IHT?

Overall, the amount recovered from savings exceeded the amount declared for IHT by about £8k (due to interest paid and increases in stock prices).

Keep_pedalling

Yes you can using form C4

https://www.gov.uk/government/publications/inheritance-tax-corrective-account-c4