Idaho Code § 27-410
The endowed care funds authorized herein and all sums paid therein or contributed thereto are, and each thereof are, hereby expressly permitted and shall be deemed to be for charitable purposes. Such endowed care shall be deemed to be provisioned for the discharge of the duty due from the person or persons contributing thereto to the persons interred and to be interred in the cemetery, and likewise a provision for the benefit and protection of the public by preserving and keeping cemeteries from becoming places of disrepair, reproach and desolation in the communities in which they are situated. The trust funds authorized herein, the income therefrom, and the moneys received under any contract providing for care of a burial space, and deposited in the trust fund shall be exempt from taxation. No payment, gift, grant, bequest or other contribution for such general endowed care shall be deemed to be invalid by reason of any indefiniteness or uncertainty of the persons designated as beneficiaries in the instruments creating such trust, nor shall said fund or any contribution thereto be deemed to be invalid as violating any law against perpetuities or the suspension of the power of alienation of title to property.
Idaho Code § 27-410