Hi alexmac and welcome to the forum
I assume you mean that HMRC are asking you to pay £6k per month not £6!
To have a tax bill of £75k, you have been making some serious profits. What has happened to all of the money, if your tax returns are up to date?
HMRC are generally a pretty supportive creditor, so long as all outstanding returns have been submitted, but if they feel that you have deliberately held money back from them they can sometimes take a moralistic stance. You will need to be able to provide a detailed summary of the events that have caused the non-payment, and demonstrate that your business is viable and can therefore support the payment of voluntary arrangement contributions.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk