 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 401k, which requires you to name a beneficiary generally.