Inheritance tax reference number

Ali71

Hello everyone.
The long dreaded day has finally come and my father has passed away. I am in the process of getting info together, informing what financial institutions I need to, utility companies etc. Losing lots of sleep over it all. I have had a quick look at the HM forms that need filling in. Not started that yet as I need final balances etc. I notice on the form for claiming the residents nil rate band (for the 175000 allowance for the parents house) a box for the inheritance tax reference number. The total of the estate with this additional claim will mean there won't be any inheritance tax to pay. So what do I do about this IHT reference number if I won't need to pay any please? I'll probably have a few more questions as I go, but this one is puzzling me and I want to get it right. Apologies if it sounds a bit stupid.
Many thanks all.  

Keep_pedalling

For many couples probate was not carried out when the first partner died, so there will be no Reference to quote, you just leave that box blank.

Ali71

Many thanks.