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Here's a great way to decide which rules belong in the rule engine and which rules could be hard-coded. The idea is that rules that you have no control over, such as compliance rules, must be rule-based so you can react quickly and implement them as soon these rules are changed. When a regulating authority tells you when the new rules become effective, you have no control whatsoever, and a rule engine enables you to change fast.

Rules that you control, where you can take your time and decide when the rules shall become effective, can be hard-coded if so desired. There still may be benefits to rule-basing these rules, but at least you can hard-code them if necessary.

See What rules belong in the BRE and which rules should be hard-coded? for original post and comments.