Despite being eligible for the Under-19s, he represented the Golden Lions U21 for the majority of the 2013 season, starting in thirteen matches during the 2013 Under-21 Provincial Championship, scoring 17 points.

[1] First-choice fly-half Marnitz Boshoff left the field ten minutes into the second half with a fractured arm,[2] which led to Van der Walt's introduction.

[3] In November 2017, Scottish Pro14 side Edinburgh announced that Van der Walt joined them on a two-and-a-half-year contract.

[4] In January 2021, Van der Walt signed an undisclosed-length contract extension with Edinburgh, saying the capital club were "building a really strong side.

[9] Jaco van der Walt’s grandfather was a detective in the Dutch police force before emigrating to South Africa.