Yes it will, as you will need to complete a new income and expenditure form, and your disposable income could change, leaving you with less money for your iva contributions each moth.
I would speak to your IP about possible implications of changing your job role, and whether or not your iva will still be viable.
Started IVA 27th Feb 2012 - Due to complete 27th Jan 2018 !!
Full & Final submitted and accepted 30th March 2015, paid 10th April 2015 - 3 yrs 1 month into IVA
Completion Certificate received- 30th April 2015!!