Most jurisdictions will bear some liability to tax on death. This can be a specific problem for the administrators of estates, usually close friends, who must ensure every known asset and liability is accounted for before making legacies and signing off the tax bill. A major problem comes with the personal liability attributed to the administrators, which means that should anything 'slip through the net' which is later discovered, there may be increased liability to tax. In practical terms, this could mean a surprise bill for several thousand which has already been distributed in legacies and for which the administrator must personally account. Providing for these outcomes in a will is one of the best ways of avoiding this hassle and stress, and it can also be the best way to ensure all assets and liabilities are uncovered. By drafting an effective will, you can be sure your loved ones don't face financial hardship after you're gone.
In the absence of a will providing specifically for the administration of a deceased's estate, it is up to the laws of intestacy to determine what happens to the entirety of our worldly possessions. Unfortunately, this doesn't usually correspond with the way we'd like things to turn out. For example, in a number of jurisdictions there are automatic provisions for spouses and kids, meaning you can disinherit, even with a will. There is also usually a default order of preference of who gets what and how much they get, which doesn't necessarily match your favourite relatives, or correspond to actual family set ups. In fact, cohabiters might run into problems getting anything, including the house in which they live without proper testamentary provisions in their favour.
As you can see there are a number of obvious benefits to drafting a will during your lifetime. Sadly, many thousands of people die each year without making these provisions, and it really is a real headache for their friends and relatives who are left with the burden of a fair settlement. Intestacy causes hostility and stress, which can be readily avoided by just simply making a written will. If you haven't made a will, it is probably a good idea to make a appointment as soon as is convenient with a legal adviser to do so, to ensure your family are provided for as you would intend and to promote a favourable distribution of your estate on death.