A plain-English guide to second and third charge loans
A second charge loan is a loan secured on a property that already has a mortgage. The existing mortgage stays in place, and the new lender takes a legal charge that ranks behind it. A third charge ranks behind both. They are also known as secured loans or homeowner loans.
How does a second charge work?
If the property is sold or repossessed, the proceeds go to the first charge holder first. Only what is left goes to the second charge holder, and then to any third charge holder. Because a later charge is more exposed if values fall, second and third charge lenders assess risk carefully and typically price and cap lending accordingly. The first-charge lender's consent is usually needed before a further charge is registered, and lenders apply their own criteria.
What is combined LTV?
Lenders look at the combined loan-to-value: all balances secured on the property, including the proposed new loan, divided by the property value. The calculator shows this building up charge by charge. Maximum combined LTV varies by lender and product.
Worked example: £400,000 property, £180,000 first charge, £40,000 new loan
- Current combined LTV: £180,000 ÷ £400,000 = 45%.
- Proposed combined LTV: £220,000 ÷ £400,000 = 55%. Equity falls from £220,000 to £180,000.
- Interest-only at 9.5% a year: £40,000 × 9.5% ÷ 12 = £316.67 a month (the rate is an assumption for illustration).
If the property is let, rent must cover both payments. With a £900 first charge payment, the combined payment is £1,216.67. At 125% ICR the rent required is £1,520.83. Rent of £1,600 gives 131.5% coverage and passes, with £79.17 a month to spare. Higher required percentages, such as 145%, would need more rent.
Second charge or remortgage?
A remortgage replaces the existing loan, which can trigger early repayment charges and a new rate on the whole balance. A second charge leaves the existing mortgage untouched but usually carries a different rate and different fees on the new amount. Which is cheaper depends on the figures involved, so compare total costs on both routes.
Common pitfalls
- Looking at the new loan's LTV alone rather than the combined figure.
- Forgetting fees such as lender, broker and valuation fees.
- For buy-to-let, testing rent against the new payment only rather than both payments together.
- Overlooking that repayment terms can be long, so total interest can be significant.
Risk note: a second or third charge is secured on your property. Your home may be repossessed if you do not keep up repayments on any loan secured on it.
What next?
Check the single-mortgage picture with the LTV calculator, test rental coverage using the buy-to-let ICR calculator, or compare monthly costs with the mortgage repayment calculator. This is general information, not advice.