If an IVA is setup for you as an individual (and not on an interlocking basis with your spouse/partner) then it should not affect your partner unless they are also in an IVA or subject to bankruptcy, they are jointly liable for any debts included in your IVA and/or they jointly own property included in your IVA. It is preferable to advise your partner and allow them to consider the impact an IVA would have on them.