what is the best isa rate
The best ISA rates in March 2026 are around 4.6–4.7% AER for easy-access cash ISAs, and just over 4.2% AER for the best fixed-rate ISAs, depending on term and provider.
What “best ISA rate” means right now
- Many of the top cash ISA rates in early 2026 sit above 4.0% AER, with the market-leading easy-access deals close to 4.6–4.7%.
- Some comparison and advice sites list easy-access cash ISAs up to about 4.60% AER, and fixed-rate ISAs (1–5 years) typically peak just above 4.2% AER.
- Rankings move frequently as banks tweak pricing, so “best” can change week to week.
Typical top rates by ISA type
| ISA type | Indicative top AER (March 2026) | Notes |
|---|---|---|
| Easy‑access cash ISA | Up to about 4.6–4.7% AER | [5][7]Usually variable rate, some include introductory bonuses for the first year. | [7]
| 1‑year fixed cash ISA | Around 4.2% AER | [3][9][5]Rate is fixed; access often restricted or penalised. | [3][9]
| 2–3 year fixed cash ISA | Roughly 4.1% AER | [9][3][5]Slightly lower than 1‑year fixes but locks the rate for longer. | [3][5]
| 5‑year fixed cash ISA | Just over 4.2% AER at best | [5]Suited to money you are confident you won’t need for years. | [5]
How to decide which “best” ISA is right for you
- If you need flexibility: A high‑paying easy‑access ISA around the 4.5–4.7% AER mark is usually the most practical choice.
- If you can lock money away: 1–3 year fixed ISAs around 4.1–4.2% AER can give certainty, but check withdrawal penalties carefully.
- If you already use your Personal Savings Allowance: A good ISA rate is extra valuable because all interest is tax‑free within the ISA allowance.
A simple rule of thumb: for short‑term savings and an emergency fund, prioritise easy access with a top‑tier rate; for medium‑term goals, consider a competitive fixed‑rate ISA if you won’t need the cash.
Quick check before you switch
Use a major comparison site or consumer‑advice site on the day you apply, filter for “cash ISA” and “best rate today”, and check:
- The AER and whether any part is a short‑term bonus.
- Access rules (penalties for withdrawals on fixed ISAs).
- Minimum deposit and whether they accept ISA transfers‑in if you’re moving an old ISA.
TL;DR: As of March 2026, a “best” easy‑access cash ISA pays roughly 4.6–4.7% AER, and a leading 1‑year fixed ISA about 4.2% AER; always re‑check comparison tables the day you apply because rates change fast.
Information gathered from public forums or data available on the internet and portrayed here.