Hi undecided and welcome to the forum
There is no such thing as a joint IVA - what the othe poster means are mutual and interlocking IVAs which are dependent upon each other and where one "joint" payment is made to all creditors. This majority of husband and wife IVAs are put forward in this manner these days, and the creditors in both estates therefore received the sam repayment. This may not necessarily be suitable for you, but an IP would be able to look into this in greater depth and advise you accordingly.
A lump sum of £80k may be sufficient to propose a reasonable IVA based upon a full and final settlement, but again take more specific advice on this. If you are considering an IVA, make sure you appoint an IP who is experienced in proposing self-employed cases, as a lot of the larger firms do not do this type of proposal.
With regard to the capital gains tax issue, this could form a creditor in the voluntary arrangement if the property were to be sold prior to the IVA and the tax was not paid. If the property is sold after the IVA is in place, then this would be a post-IVA liability and you would be required to pay it. How much do you think the tax bill would be?
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
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp