Offset mortgages
An offset mortgage links your savings to your mortgage balance, so you’re charged interest only on the difference. For contractors holding cash for tax, it can cut interest substantially without locking the money away.
How offset works
Your linked savings are set against your mortgage balance, and interest is calculated only on the net figure. Hold a £300,000 mortgage with £50,000 in a linked account, and you pay interest as though you owed £250,000 — while your savings stay accessible.
You don’t earn interest on the savings; instead you avoid paying (higher) mortgage interest on the equivalent amount, which is usually the better deal after tax.
Why it suits contractors
Contractors and directors often hold significant cash — for VAT, corporation tax, or simply as a buffer between contracts. Offsetting puts that idle money to work reducing interest, without committing it as an overpayment you can’t get back.
- Tax reserves work for you while they wait to be paid.
- Liquidity kept — withdraw your savings whenever you need them.
- Interest saved is effectively a tax-free return.
| Factor | Offset | Overpayment |
|---|---|---|
| Effect on interest | Interest charged only on the net balance | Reduces interest by permanently cutting the balance |
| Access to your cash | Savings stay accessible to withdraw any time | Cash is locked into the property |
| Tax on the savings | None — no interest is earned to be taxed | Not applicable |
| Best suited to | Contractors needing liquidity for tax reserves | Those certain they won’t need the cash back |
The trade-offs
- Offset rates can be slightly higher than standard products.
- You forgo interest on the savings themselves.
- The benefit depends on holding meaningful linked savings — small balances move the needle little.
Offset, answered
Can I still access my offset savings?+
Yes — that’s the point. Unlike an overpayment, linked savings remain yours to withdraw at any time. Taking money out simply increases the balance you pay interest on again.
Is offsetting better than overpaying?+
Offsetting keeps your money accessible while still cutting interest; overpaying reduces the debt permanently but locks the cash away. For contractors who need liquidity for tax, offset is often the better fit.
Do I pay tax on the benefit?+
No. Because you’re reducing interest rather than earning it, there’s no interest income to be taxed — which makes the effective return attractive for higher-rate taxpayers.