 It is the main reason why about 5% of people in our survey don't write a will, but by far the biggest reason is people saying they just haven't gotten around to it yet. They plan to, but it's just never a priority. The second most common reason why people haven't written a will, in our survey at least, is that they believe they don't need to because they have already named beneficiaries on their most important assets, like their 401 , which requires you to name a beneficiary generally.