Cash ISA Guide: Best Cash ISA Rates UK 2025/26 — Easy Access, Fixed and How to Choose the Right Account
With the Bank of England base rate now at 3.75% following six consecutive cuts since August 2024, the window to lock in competitive cash ISA rates is narrowing fast. Yet the best easy-access cash ISAs still pay up to 4.40% AER — comfortably above inflation at 3.0% — while fixed-rate options offer rate certainty for up to five years. For the 2025/26 tax year, every UK adult has a £20,000 ISA allowance to shelter savings from tax, but that figure is set to fall sharply from April 2027. The case for using your cash ISA allowance has rarely been stronger. Higher-rate taxpayers lose 40% of their savings interest above a £500 personal savings allowance, and additional-rate taxpayers get no allowance at all. A cash ISA means every penny of interest is yours to keep — this tax year, next year, and permanently. With the ISA deadline of 5 April 2026 approaching and a major allowance cut looming, understanding today's best cash ISA rates and how to choose between them is essential for any serious UK saver. Want to weigh up live offers before reading on? Compare 17 cash ISA rates side-by-side in our interactive comparison tool — filter by easy-access, fixed-rate or notice account, sort by AER, and check minimum-deposit thresholds at a glance.