Some firms will insist as they calculate the payment on household income, but with most, if your partner wishes to withold these details they will assume a 50/50 split of household expenses to calculate your payment.
If your partner earns significantly less than you this 50/50 assumption will not be in your favour.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014