Remortgaging an interest-only mortgage

You can remortgage an interest-only mortgage — to a better interest-only deal, onto repayment, or a part-and-part blend. Lenders want to see a credible plan for repaying the capital, and acceptable repayment strategies vary by lender. The earlier you act, especially as the term nears its end, the more options you keep open and the less likely you are to face a capital shortfall.

Can you remortgage an interest-only mortgage?

Answer first: yes. You can remortgage an interest-only mortgage to another interest-only deal, switch it to repayment, or move to a part-and-part blend of the two. The one extra requirement compared with a repayment remortgage is that the lender wants to see a credible plan for repaying the capital at the end of the term.

On an interest-only mortgage, your monthly payment covers only the interest, so the capital you borrowed doesn’t reduce — at the end of the term, the full original balance is still owed and must be repaid in one lump sum. That structure keeps monthly payments low, which is why it’s common in buy-to-let and among borrowers who hold cash for other purposes. But it puts the spotlight on one question at remortgage time: how will the capital be repaid? The difference between interest-only and repayment is set out in full in interest-only vs repayment.

What are your three options at remortgage?

Answer first: you can stay interest-only on a new deal, switch fully to repayment, or split the difference with part-and-part. Each balances monthly cost against how the capital gets cleared.

Stay interest-only on a better deal

If interest-only still suits you and you have a sound repayment plan, you can remortgage to a new interest-only deal — typically to escape an expiring rate or the standard variable rate. Your monthly payment stays low, but the capital question remains, so the lender will want evidence of how it’ll be repaid.

Switch to repayment

Moving onto a repayment mortgage means each payment now clears capital as well as interest, so the debt is fully repaid by the end of the term. The trade-off is a higher monthly payment — sometimes substantially higher, because you’re now clearing the whole balance over the remaining years. Many borrowers make this switch as their interest-only term nears its end and the capital question becomes pressing. You can compare the two payments directly in the repayment calculator.

Part-and-part

A part-and-part remortgage converts some of the balance to repayment while leaving the rest interest-only. It’s a middle path: your monthly payment rises less than a full switch, while you start chipping away at the capital and reduce the shortfall you’d otherwise face at the end. It can be a sensible staging post for someone who can’t yet afford full repayment but wants to start reducing the debt.

What repayment strategy will a lender accept?

Answer first: it varies a lot by lender. Acceptable plans can include savings or investments, other property or assets, or downsizing — but each lender sets its own rules on what qualifies and how much of the capital it must cover. This variation is the main reason an interest-only remortgage benefits from a whole-of-market search.

When you remortgage interest-only, the lender assesses your repayment strategy as well as your income. Some lenders are comfortable with a broad range of plans; others are restrictive about what they’ll accept and may require the plan to comfortably cover the full balance. Because the criteria differ so widely, the same borrower with the same plan can be declined by one lender and accepted by another — which is exactly why whole-of-market breadth matters here. Independent guidance on interest-only options is also available from MoneyHelper.

What if the term is ending and you have no plan?

Answer first: address it as early as you can. If an interest-only term is approaching its end without a repayment plan in place, you face a capital shortfall — but remortgaging onto a sustainable arrangement (repayment, part-and-part, or a new interest-only deal with a credible plan) is usually far better than letting the term simply run out.

The worst outcome is reaching the end of the term with the full capital due and no way to repay it. Acting early keeps your options open: the more time before the term ends, the more lenders will engage and the more affordable a switch to repayment is, because the balance is spread over more remaining years. Leaving it late narrows the field and raises the monthly cost of any switch. If you’re in this position, start with the remortgage hub and get advice well ahead of the deadline.

Where offset can help interest-only borrowers

If you hold significant cash — common for company directors saving for tax — an offset mortgage can be a smart pairing. Offsetting your savings against the balance reduces the interest you’re charged while keeping the cash accessible. On an interest-only basis, that can meaningfully cut your monthly interest, and the savings themselves can form part of a future repayment plan. It’s not right for everyone, but it’s worth weighing if your cash position suits it.

What should contractors and directors know?

Answer first: the same options apply, but two things must line up — a lender that reads your income correctly, and one that accepts your repayment strategy. Both vary by lender, so placement matters twice over.

Interest-only has genuine appeal for some contractors and directors, whose income and cash flow can be lumpy and who may hold capital in the business or in investments earmarked for repayment. But it stacks two lender-specific judgements on top of each other: the affordability assessment (which must read your contract or dividend income properly) and the repayment-strategy assessment (which must accept your plan). Getting both right at once is the core of placing an interest-only contractor remortgage well — and it’s where a specialist broker adds the most value.

Why lenders look closely at interest-only

Answer first: lenders scrutinise interest-only because the capital isn’t reducing during the term — so the whole balance depends on a repayment plan actually working out. That’s why the repayment-strategy check is the defining feature of an interest-only remortgage, and why criteria are stricter than on repayment deals.

On a repayment mortgage, the debt shrinks with every payment, so the lender’s risk falls over time and there’s no lump sum to find at the end. On interest-only, the balance stays put for the whole term, and everything rests on the plan to clear it. If that plan underperforms — an investment that doesn’t grow as hoped, a property that doesn’t sell for what was expected — the borrower can be left with a shortfall. Lenders price and assess for that reality, which is why they ask for evidence of the strategy and set their own rules on what qualifies.

For you, the practical takeaway is that the quality and credibility of your repayment plan is as important as your income when remortgaging interest-only. A clear, well-evidenced plan opens more lenders and better rates; a vague one narrows your options. It’s also why acting early matters even more here than on a standard remortgage — the closer you get to the term end without a solid plan, the fewer lenders will engage. Treat the repayment strategy as something to get right deliberately, not an afterthought.

The bottom line

You can remortgage an interest-only mortgage — to a new interest-only deal, to repayment, or to part-and-part — provided you can show a credible plan for repaying the capital. Switching to repayment clears the debt by the term’s end but raises the payment; part-and-part is a measured middle path; staying interest-only keeps payments low if your plan is sound. Because both income and repayment-strategy criteria vary so widely between lenders, this is a strong case for whole-of-market advice — especially as the term nears its end. To review your options before any deadline, speak to an adviser.