The situation
An internationally connected family wants a £2.4m mortgage on a £4m UK home. They hold an investment portfolio and other properties, and would prefer to keep investments rather than sell immediately. Acquisition costs are budgeted separately. They ask whether an interest-only mortgage might fit their wider plans.
What makes this more involved?
A statement of net worth does not establish that assets are liquid, personally owned or acceptable to a lender. The mortgage payments and the capital repayment plan require separate analysis. Selling an asset later exposes the household to value, access and timing risks.
How I would approach it
Understand ownership and accessibility
Identify the account holder, asset types, currency, existing charges and withdrawal restrictions. Keep pension, trust and company-owned assets distinct from assets held personally.
Assess both obligations
Review recurring income for payments and evidence for the capital repayment plan. Consider repayment or part-and-part as alternatives, rather than assuming interest-only follows from wealth.
Stress the proposed exit
Explore a fall in investment value, an inconvenient sale date or delays realising property. Coordinate with the family’s regulated investment and tax advisers without promising investment returns.
What could change the plan?
What if markets fall before the mortgage ends?
The debt remains due. A lender or adviser review may require additional saving, partial repayment, a different strategy or an earlier sale.
Can projected business-sale proceeds be the repayment plan?
An uncertain future transaction needs careful scrutiny. Its timing and net proceeds cannot be treated as cash already available.
What this would establish
Reach an evidenced repayment strategy and borrowing level that remain understandable when assets or circumstances change. No lending or investment outcome is assumed.
Is net worth the same as affordability?
No. Asset wealth, income available for payments and a credible capital repayment strategy are different considerations.
Link to this answerEducational content reviewed 9 October 2026. Individual advice requires an assessment. Lender and policy criteria can change.
Further reading: MoneyHelper: repayment and interest-only mortgages. These references provide background information; they do not indicate acceptance of this example.