As Melanie says corporation tax is the liability of the company and as such is not your debt. However, it is not unusual for directors of small companies to incur substantial personal debts when the company was incorporated or hit financial trouble.
If this is the case an IVA may still be a suitable option for you but it would be necessary to check the solvency and viability of the company. If the company is to continue to trade your IVA payments would be predicated on the salary and dividends that you are paid by the company. If the company is to fail then you would need to provide evidence of earnings or projected profits from self employment to propose a viable IVA.
Finally if there are no personal debts, it may be possible to propose a Company Voluntary Arrangement[CVA]to allow the company to trade on and pay it's debts. You should certainly speak to an insolvency practioner for advice.
