Here’s a fun paradox for the financial advisor — while you spend your entire day planning other people’s finances, your own billing systems are some of the most challenging parts of your job. Like the therapist who is the most challenging client for other therapists, you need to seek solutions from those who may understand the intricacies of your profession. Central to the issue of why billing for financial advisors is so challenging is the task of finding compliant payment processing solutions. The retainer model is gaining popularity with financial advisors as a means of serving a new set of clientele that is not asset-laden. One of the key obstacles to this model is sourcing a payment processor that regulators are happy with.