If the house went into the DT in 2016 and has been in it ever since, it has since then ceased to be part of either spouse’s free estate since then. The fact that they lived in it is irrelevant. There is in each death estate no qualifying relevant interest for RNRB.
The transfer into the DT was a GROB by each spouse so 50% of the house was taxable on the death of the first, utilising all or part of the husband’s NRB and reducing or eliminating TNRB. On the second death the other 50% was taxable.
A transfer which is a GROB is not the disposal of a qualifying former residential interest, so no downsizing addition: s.8H(4D). A GROB property can itself be a QRI but it is not “inherited” when the gift was to a DT rather than outright to an individual: s.8J(6).
The DT is an RPT, in fact two such: s.44(2). Each spouse will have made a CLT probably using their nil rate band and each survived it by 7 years. So these transfers did not cumulate with their respective death estates. If each had a nil cumulation before the transfers, each trust will have a full NRB and the first TYA will be in 2026.
CGT will doubtless be covered by PPRR on entry into the trust and on a future disposal by the trustees (a non-exempt period will begin 9 months after the second death, although hold-over will be available in principle on a distribution of the asset).
If the couple had done nothing it seems their combined estates would have been entirely outside IHT if the house had been “closely inherited” on the second death. So 2 RNRBs of £350k in total have been wasted. The wife’s NRB of £325k will probably be available to offset her GROB and only TNRB if the husband’s NRB exceeded the then value of the GROB on his death. There is a likelihood that on the wife’s death there will be a charge to tax as the value of her GROB at £375k plus £10k = £385k will exceed her NRB, so £60k is taxable subject to TNRB. That will be the excess if any of £325k over the value of a half share of the estate at the husband’s death. I hope that any tax payable on the first death has not been overlooked because I expect probate was skipped.
A consolation prize seems to lie in the valuation of each GROB at each death. The related property rules do not apply to DTs made by spouses. On the first death a discount of 15% should be due as the wife was then in occupation under her own trust. On her own death the value just before it should be 10% on the basis that one must assume that only the half interest is for sale but a sale nonetheless with vacant possession as no other person was then in occupation.
On the facts there may be a tax charge on either or both deaths which was totally avoidable because, on a “do nothing” basis, total headroom of £1million would have been available on the second death if the spouse exemption had applied on the first death. DTs cost money to set up, run, and end. All that is likely to have been achieved is care fees protection provided there was no deprivation of assets at set up. Avoiding probate is a mere bagatelle if IHT formalities must still be processed, and an estate containing a GROB cannot be an excepted estate.
Why do lay clients allow themselves to be railroaded into these arrangements? Presumably it is not something that was divinely vouchsafed to them on a mountain top as happened to Moses. Whoever advised on this deserves to be sued but establishing their liability may not justify further expense or hassle.
Jack Harper