IVA monthly payments: how the figure is set
The payment is not a percentage of your debt. It is your surplus, evidenced line by line.
The assessment
Everything starts from the budget: wages, benefits, pension and other income on one side; rent or mortgage, utilities, food, transport, insurance, dependants and the rest on the other. The gap is the contribution. Understating costs to look good is self-defeating — an unaffordable IVA fails, and missed payments have real consequences. On completion of all payments, the end-of-IVA process takes over; the self-employed version of the assessment is covered separately. The assessment is step three of applying for an IVA.
When the figure changes
The annual review re-runs the assessment. Pay rises can increase the contribution; genuine cost increases can reduce it; a serious change mid-year justifies contacting your supervisor rather than waiting. Extra income like overtime and bonuses is typically shareable under your terms — windfalls and extra income explains the principle.
To see what any given payment adds up to across the term, the IVA calculator does the arithmetic without the marketing.