How is a hiskamet yerusha different from a mutual will?

A mutual will under Section 29 of the Inheritance Law is still a will — each testator generally retains the right to revoke their portion unless the will contains an express no-revocation clause. A hiskamet yerusha is stronger: it is a contract and irrevocable by one party alone.

Well-advised couples who want a binding, mutual estate plan use a hiskamet yerusha rather than relying on a mutual will, which can be unilaterally undone without the other party's knowledge.

For more detail, see Inheritance Agreements in Israel (Hiskamet Yerusha): A Complete Guide for Couples and Foreign Nationals.