Interest rates determine how much your savings grow over time. 

The interest rate you receive for the funds you deposit in your Tide Instant Saver account is equal to the published Bank of England Base Rate (gross) minus a certain percentage, determined by Tide. It’s calculated as a percentage of your balance, and the higher the interest rate, the more your savings can grow.

Thе interest rate applicable to your Tide Instant Saver account is a variable rate and can change as the market fluctuates. The interest you earn can either go up or down depending on the rate. You can find the interest rate applicable to your savings account in the relevant Summary Box.

From 11 May 2026, members on our Smart, Pro and Max plans are enjoying preferential interest rates* on Instant Saver accounts: 

• Smart – 2.50% AER (variable) on business savings up to £100,000

• Pro – 3.00% AER  (variable) on business savings up to £150,000

• Max – 3.25% AER  (variable) on business savings up to £1,000,000

Now you can earn even more interest:

When you open a main Tide Business Current Account, or just a Tide Instant Saver without already holding a main account, you get our promotional rates for the first 4 months. So, you’ll earn up to 4% variable AER on funds you put in your Tide Instant Saver, at no additional cost. After this, the interest rates of your Tide plan will apply – see the Summary box.

If your Tide Business Current Account is older than 4 months and you’re on Max, the Tide Instant Saver Boost is available for £99 + VAT per month. See everything about it in its Summary Box. 

*The variable rates shown are correct as of 11 May 2026. The interest is applied in a progressive tiered structure, meaning that each portion of the deposit earns interest at the corresponding rate for that tier – rather than applying the highest interest rate to the entire deposit, only the amount exceeding each threshold earns the higher rate.

Compound interest is interest calculated on both your original savings and any interest you've already earned.

This means your savings can grow faster over time, as each interest payment increases the amount on which future interest is calculated. The more often interest compounds, the more your savings can grow.

It depends on how your business is set up.

If you're a sole trader, any savings interest you earn is your personal income - and is subject to income tax if it exceeds certain limits.

If you're a limited company director, your savings belong to the business and any interest earned is company revenue - which may be subject to corporation tax.

Find out more in our savings interest tax guide.