Minimum debt for an IVA: the honest answer
There is no legal minimum. There is a practical one, and it comes from arithmetic rather than regulation.
Why a practical floor exists
An IVA has professional costs, paid from within your contributions. On a small debt those fees become a large share of every pound you pay, creditors receive little, and the proposal fails on its own arithmetic — creditors holding 75% by value of the votes have to see the point of it. The IVA calculator makes this visible: set a small debt and a modest payment and watch how the totals behave.
If your debt is below it
Smaller debts usually point at different routes: a Debt Relief Order where the criteria fit, a Debt Management Plan, negotiated repayment, or a full and final settlement if a lump sum exists. Which of those fits is exactly the assessment an authorised adviser exists to make.
Related: the full criteria and where the fees actually go.