How to structure an inheritance for a spendthrift heir

Dear Liz: My financially illiterate, almost 50-year-old son will be living off his inheritance when I die. A good part of his life was spent drifting, so I have no idea if he will receive Social Security or how much. How do I structure his inheritance so that he won’t fritter it all away in a short time and then expect his dependable sibling to shoulder his burden?

Answer: A spendthrift trust can keep your son from frittering away his inheritance. These trusts limit the beneficiaries’ access to the principal — the amount you put into the trust. This limitation prevents creditors from accessing the principal as well, and he won’t be able to borrow against the trust, either.

That’s the good news. The bad news is that you have to find someone to be the trustee, and that probably shouldn’t be his sibling. Putting one sibling in charge of another’s money is a good way to ensure lifelong enmity. Look instead for a professional trustee at a bank or trust company to fill this role.

A spendthrift trust is not a do-it-yourself project. Hire a good estate-planning attorney with experience in this area. You’ll need to make a lot of decisions, such as how payments will be determined, how often they’ll be made, whether the trustee will have the power to deny payments or to give your son access to the principal if his circumstances change.