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Keep more of your savings; don't let tax take a bite.

Keep more of your savings interest with an ISA. Lock in a fixed interest rate today.

1 Year Fixed Rate Cash ISA
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Lock in a Cash ISA rate today


Don't let tax take an unnecessary chunk of your hard-earned savings interest.

Get certainty about the tax-free interest you'll earn with a Fixed Rate Cash ISA.

Choose a fixed rate and relax in the knowledge your money is working hard and earning tax-free interest.

Lock in for 12 months with our 1 Year Fixed Rate Cash ISA. 

If you want to fix your rate for longer, explore our full range of ISAs including fixed rate options for 2, 3, or 5 years.

3.70%

Tax-free^ / AER† (Fixed)

1 Year Fixed Rate Cash ISA

  • Open with £500
  • Save up to £20,000 this tax year
  • No withdrawals allowed
  • Choose interest paid yearly or monthly
  • Pay into the account whilst it's on sale
1 Year Fixed Rate Cash ISA

Transfer your ISA to Principality

Moving your Cash ISA to us? Excellent. We can't wait to help you make the most of your tax-free savings options. Follow our simple transfer process and find out why over 500,000 savers choose Principality Building Society.

Make an ISA transfer
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Make the most of your ISA allowance

Already have a Principality ISA you haven't maxed out? Remember you can still save up to £20,000 this tax year. Make the most of your tax-free savings by using your full ISA allowance. Contact your local branch or log into your online profile to pay into your ISA.

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Why choose Principality?

  • Our branch promise

    We're on Welsh high streets to stay. We're real people who promise clear guidance, no pressure and support at every stage of your savings journey.

  • Owned by you

    We're run for our members. Decisions are made for your benefit and your voice helps shape what we do. 

  • Your savings protected

    Your eligible deposits with Principality Building Society are protected up to £120,000 under the Financial Services Compensation Scheme.

Compare all Cash ISAs

Browse our full range of Cash ISAs including all our fixed rate and variable rate options.

Browse Cash ISAs

Additional information

*Gross interest is the rate of interest before income tax is deducted at the rate set by law.
†AER stands for Annual Equivalent Rate and illustrates what the interest rate would be if interest was paid and compounded once each year.
^Tax-free means the interest you earn isn't subject to UK Income Tax and Capital Gains Tax. Tax treatment depends on your individual circumstances and could change in future.