Trustees are subject to two important rules which do not attract frequent attention. First, a trustee must not purchase trust property and second, a trustee must not purchase a beneficiary's beneficial interest in the trust. These rules are known, respectively, as the "self-dealing" rule and the "fair-dealing" rule. This article begins with a brief introduction to those rules. The focus of this article, however, concerns the limitation period for claims based on contraventions of those rules by an express trustee. Surprisingly, this issue has not been the subject of any Australian decision until recently. The article concludes by suggesting that an action for breach of the self-dealing rule is likely to have either no statutory limitation period, or a 12-year limitation period, depending on the jurisdiction (except in Western Australia where the limitation period is likely to be six years), whereas an action for breach of the fair-dealing rule, in the absence of fraud, is likely to have a six-year limitation period (except in the Northern Territory where the limitation period is likely to be three years).