An offset mortgage is one of the more clever mortgage products, and one of the least understood. If you have savings sitting in the bank earning little interest, an offset mortgage can put them to work reducing your mortgage cost instead — without you actually spending them.

How it works

With an offset mortgage, your savings are linked to your mortgage but not paid off against it. Instead, the savings balance is “offset” against the mortgage balance when interest is calculated. If you owe £200,000 and hold £20,000 in linked savings, you are charged interest as though you owe £180,000. Your savings stay yours — you can access them whenever you like — but while they sit there, they cut your interest.

Why it can be powerful

Two reasons. First, mortgage interest rates are usually higher than savings rates, so reducing your mortgage interest is often worth more than the interest you would earn on the savings themselves. Second, the benefit is effectively tax-free — you are saving interest rather than earning it, so there is no tax on the gain, which can make it especially attractive for higher-rate taxpayers.

You can usually choose to either reduce your monthly payments or keep payments the same and shorten the term — paying the mortgage off sooner.

Who offset mortgages suit

They suit people who hold meaningful savings and want to keep them accessible rather than lock them into overpaying the mortgage. They are popular with the self-employed, who often hold money back for tax bills — that money can offset the mortgage in the meantime and still be there when the tax is due. And they suit higher-rate taxpayers, for whom the tax-free benefit is worth most.

If you have little in savings, an offset mortgage has less to offer, and the rates can be slightly higher than a standard deal — so the savings benefit has to outweigh that.

Is it right for you?

Whether an offset mortgage beats a conventional mortgage plus a separate savings account depends on how much you hold, your tax position and how you want to use the money. It is a genuine “it depends” — which is exactly why it is worth talking through.

We can advise on offset mortgages and will work out whether one genuinely benefits you. If you have savings and a mortgage, get in touch and we will run the numbers.