On death in 2002, under the will, a NRBDT and IPDI for spouse were set up. In 2012, the TYA charge based on market value of NRBDT and initial value of IPDI was calculated. Under FA2015, you no longer include the initial value of IPDI in calculating any future TYA/exit charges. In 2017, the surviving spouse dies and the trustees wish to wind the NRDBT. Moving forward, I just wanted to check that you need to recalculate the effective IHT rate to ignore the inital value of IPDI and that you don't need to use the effective IHT rate at the TYA in 2012, which does include the initial value of the IPDI.
Thank you in advance.