Hi IVA help and welcome to the forum
You are allowed to take on business credit during an IVA, so long as it is in the normal course of trading and is paid within terms. You would also need to let your suppliers know that you are subject to an IVA process.
Don't worry - there are hundreds of self-employed traders in IVAs at the moment, happily trading with their suppliers on such terms.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp