I am also being asked to advise a large TPA firm who wants to jump into the LSA market. My independent research of IRS documents, before finding this page, also led me to believe that the benefit should be taxed when made available, rather than when a claim is reimbursed. However, as others have pointed out, the plethora of online providers marketing this "revolutionary benefit" universally say the employee isn't taxed under they use the money.
I can understand how, if the benefit was relatively small, the reimbursable events limited, and the benefit was use-it-or-lose-it, it would make sense that you wouldn't tax a person until they used it. For instance, if a plan only paid $50/month for physical fitness classes or gym memberships, lots of people won't use that benefit and they'll be quite angry if they are taxed for something they didn't want. However, with these LSA accounts being expanded to be used for darned near anything an employer can think of (new golf clubs or tickets to Hamilton anyone?), it makes more sense to tax when the money becomes available because there's really no reason to NOT use it.
Further, my client wants to make the LSA a funded account held in a VEBA, so in theory somebody could accumulate considerable money in that account, take it with them when they leave employment, etc. In this instance, this really does look like a deferred comp plan subject to 409A even if the employee might not ever turn in a claim for the money. That leaves to me wonder, what if somebody got $1,000/year for 10 years and never used it? They've been taxed on it .... where does the money go? Back to the employer with the individual then taking a tax credit (as you would in a more standard deferred comp plan when it loses value over time?) Can you have a beneficiary?
Many thanks to Brian Gilmore who came to the same conclusions I did, but with much greater grace and style! I'm going to advise them to tax when funded and we'll see if they are successful selling such a product!