Option A
Repayment
A repayment mortgage includes both interest and capital repayment, so the loan should be cleared by the end of the term if payments are made.
Interest only vs repayment mortgage: which is better?
Updated June 2026 8 min read
Quick verdict
A repayment mortgage is the safer default for most homeowners because the debt reduces over time. Interest only can suit some investors or high-income borrowers with a credible repayment plan, but it is risky without a clear way to repay the capital.
Option B
Interest only
An interest-only mortgage pays only the interest each month, so the original loan still needs repaying at the end of the term.
Side-by-side comparison
Repayment mortgages pay down the debt each month. Interest-only mortgages reduce the monthly payment but leave the full loan outstanding at the end, so they need a separate repayment strategy.
Monthly payment
Repayment
Higher
Interest only
LowerBetter
Debt reduces
Repayment
YesBetter
Interest only
No
Own debt-free at end
Repayment
Yes if paid as agreedBetter
Interest only
Only if capital is repaid separately
Repayment plan needed
Repayment
No separate planBetter
Interest only
Yes
Approval
Repayment
More commonBetter
Interest only
Stricter
Best for
Repayment
Most homeowners
Interest only
Specific plans or investors
| Compare | Repayment | Interest only |
|---|---|---|
| Monthly payment | Higher | LowerBetter |
| Debt reduces | YesBetter | No |
| Own debt-free at end | Yes if paid as agreedBetter | Only if capital is repaid separately |
| Repayment plan needed | No separate planBetter | Yes |
| Approval | More commonBetter | Stricter |
| Best for | Most homeowners | Specific plans or investors |
Pros and cons
Repayment pros and cons
Pros
- ✓Debt reduces each month
- ✓Lower end-of-term risk
- ✓Works for most homeowners
- ✓Builds equity through payments
Cons
- -Higher monthly payment
- -Less monthly cash flow
- -Early years mostly pay interest
- -Can reduce borrowing headroom
Interest only pros and cons
Pros
- ✓Lower monthly payment
- ✓Cash-flow flexibility
- ✓Can suit buy-to-let investors
- ✓Can work with a disciplined repayment plan
Cons
- -Capital remains outstanding
- -Repayment plan may fail
- -Harder to qualify
- -Can create serious retirement risk
Cost examples
Standard homeowner
For a main home, repayment is usually the safer route because the debt falls automatically.
- Likely fit
- Repayment
Buy-to-let investor
Some investors use interest only for cash flow and plan to sell or refinance later.
- Likely fit
- Interest only
No repayment plan
Interest only without a credible capital repayment strategy is high risk.
- Decision
- Avoid
When to choose Repayment
- ›You are buying your main home
- ›You want the debt cleared by the end
- ›You do not have a separate repayment vehicle
- ›You want lower long-term risk
- ›You can afford the higher monthly payment
When to choose Interest only
- ›You are a buy-to-let investor
- ›You have a credible repayment plan
- ›You have a large deposit
- ›You understand the end-of-term risk
- ›You need cash-flow flexibility and can manage it responsibly
FAQs
Can I switch from interest only to repayment?
Many lenders allow this, but affordability checks and product terms may apply. Switching earlier gives more time to reduce the debt.
What happens if I cannot repay an interest-only mortgage?
You may need to sell, remortgage or agree another solution with the lender. Without a repayment plan, keeping the home can become difficult.
Is interest only cheaper overall?
The monthly payment is lower, but total interest can be higher because the capital does not reduce during the term.
Can first-time buyers get interest only?
It is usually difficult because lenders often require a larger deposit, strong income and evidence of a credible repayment strategy.
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