The transaction

Mortgages in plain terms

A mortgage is a loan secured against a specific building. Every feature of it follows from that one sentence.

Secured means the building is the guarantee

Because the loan is secured on the property, the lender's risk is not only about whether the borrower can pay. It is also about whether the building would cover the debt if they could not. That is why lenders care about the property's value, its construction, and sometimes its type, quite separately from the borrower's income.

Capital and interest

A repayment loan is repaid in instalments that contain two parts: interest on what is still owed, and a repayment of some of the capital. Early in a long term, most of each instalment is interest, because the outstanding balance is large. As the balance falls, the same instalment retires more capital. This is arithmetic, not a penalty.

An interest-only arrangement repays no capital during the term, so the whole sum remains owed at the end and must be repaid from somewhere else. The monthly figure is lower; the obligation is not.

Term

The term is how long the loan runs. A longer term reduces each instalment and increases the total interest paid, because the balance stays high for longer. A shorter term does the opposite. Neither is better in the abstract; they trade monthly pressure against total cost.

Loan to value

Loan to value expresses the loan as a share of the property's assessed value. A larger deposit means a lower loan to value, which reduces the lender's exposure and generally makes borrowing cheaper. The relationship is usually stepped rather than smooth, so small changes in deposit can matter more at some points than others.

Fixed and variable

A fixed arrangement holds the interest rate for a defined period, after which it reverts to something else. A variable arrangement moves with a reference rate. Fixing buys certainty for a period and usually costs something for it; the important question is not which is cheaper today but what happens at the end of the fixed period, when the loan is re-priced against whatever conditions exist then.

Affordability is tested, not assumed

Lenders assess whether payments could still be met if conditions changed, rather than only whether they can be met today. That is why the sum offered is often lower than a simple multiple of income would suggest, and why existing commitments reduce it.

The costs that sit alongside the loan — insurance, maintenance, and the recurring charges attached to some forms of ownership — are part of the real monthly figure even when they are not part of the mortgage.

A note on scope

This page explains mechanics. It does not recommend products, name lenders, quote rates or advise on individual circumstances, all of which depend on facts a page cannot know.