Why the words differ but the maths doesn't
Every amortising mortgage is governed by the same formula: a monthly payment that covers interest on the outstanding balance plus a slice of principal, calculated so the balance reaches zero at the end of the term. What differs across countries is the terminology, the standardised rate disclosure, and features like offset accounts — not the underlying arithmetic.
Key terms side by side
The table maps the most common mortgage terms across four English-speaking markets. The all-in cost disclosure — the figure designed to let borrowers compare deals including fees — has a different name in each.
| Concept | United States | United Kingdom | Australia | South Africa |
|---|---|---|---|---|
| The loan | Mortgage | Mortgage | Home loan / mortgage | Home loan / bond |
| All-in cost disclosure | APR | APRC | Comparison rate | APR (with prime reference) |
| Benchmark rate | Prime / SOFR-linked | Bank of England base rate | RBA cash rate | Prime lending rate |
| Pay to lower the rate | Points (discount points) | Arrangement/product fee | — | — |
| Savings-linked offset | Rare | Offset mortgage | Offset account | Access bond |
Features that don't translate directly
US borrowers can pay discount points — an upfront fee, each point typically 1% of the loan — to buy down the interest rate, a practice far less common elsewhere. UK and Australian borrowers more often use offset accounts, where savings balances reduce the interest charged on the mortgage without being formally repaid. In South Africa, an access bond lets a borrower withdraw previously overpaid amounts back out of the home loan.
Fixed-rate norms differ too: the 30-year fixed-rate mortgage is a US staple, whereas UK fixed periods are typically 2–5 years before reverting to a variable rate, and Australian and South African loans are predominantly variable-rate. This is why a 'fixed-rate mortgage' means something quite different depending on the country.
Comparing the true cost across markets
Because each market has its own standardised disclosure — APR in the US, APRC in the UK, comparison rate in Australia — the safest way to compare two loans within a country is to use that country's all-in figure, which bundles fees into a single rate. Comparing across countries is harder, because the benchmark rates, fee structures and tax treatments differ; the mortgage mathematics is identical, but the surrounding rules are not.
よくある質問
What is a mortgage called in South Africa?
A home loan in South Africa is commonly called a bond, usually quoted relative to the prime lending rate. An access bond lets you withdraw previous overpayments.
What's the difference between APR and APRC?
Both are all-in cost disclosures that include fees. APR is the US term; APRC (Annual Percentage Rate of Charge) is the UK equivalent. Australia uses a 'comparison rate.'
What are mortgage points?
In the US, discount points are an upfront fee — typically 1% of the loan each — paid to lower the interest rate. The practice is uncommon in the UK, Australia and South Africa.
Is a fixed-rate mortgage the same everywhere?
No. In the US a 30-year fixed is standard; UK fixed periods are usually 2–5 years before reverting to variable; Australian and South African loans are mostly variable-rate.
参考文献
- Consumer Financial Protection Bureau (US) — mortgage terms, APR and discount points. https://www.consumerfinance.gov/
- MoneyHelper / Financial Conduct Authority (UK) — APRC and mortgage basics. https://www.moneyhelper.org.uk/
- ASIC MoneySmart (Australia) — comparison rate and offset accounts. https://moneysmart.gov.au/