A Will has to cover many unforeseen situations, which is why this Clause is important. Simultaneous Death is a term used to describe situations where your spouse or any other heir dies within a determined number of days. The number of days is entirely up to you, a suggested 30 days is usual. For example, if your spouse was to die simultaneous (at the same time) to you, or your spouse or any beneficiary was to die a few days later, or within the nominated 30 day period, this clause will take effect. Also your estate may avoid extra legal costs and administrative complications for the executor by enforcing this clause. This normally only applies to a husband or wife, a de facto partner or to children who travel with you often.