Question:
If someone cosigned on my mortgage from an Israeli bank (that has a heter iska) do I also need a heter iska with the cosigner? If needed can this be done retroactively?
Answer:
You don’t have to sign your own heter iska, because you are just backing up the business agreement that was signed between the two parties. There is an opinion that holds that you should add that your cosigning is according to the heter iska, but most poskim don’t agree and if it was already signed you surely don’t have to do anything about it.
Best Wishes
