If you have been widowed you may be entitled to an additional allowance that has not been included in these calculations. There are other factors (e.g. lifetime transfers made, business assets owned, how wills are written etc.) which may affect the potential tax payable, therefore this does not constitute individual advice. This calculator is intended for illustrative purposes only and can just provide an indication based upon the information you have provided. Tax planning is a complex area and tax treatment depends on personal circumstances.
If you're unsure in anyway, why not get in touch to speak to an inheritance tax specialist at The Private Office?