Martin Lewis Best 2 Year Fixed Rate ISA: Compare 2026 Rates

The best two-year fixed rate ISA is paying 4.71% AER in May 2026, according to MoneySavingExpert’s latest market tracking. Martin Lewis’s team regularly monitors the market to find top rates, and this guide breaks down the current leaders, explains the fine print, and helps you decide if locking in for two years fits your 2026/27 savings plan.

Best 2-year fixed rate ISA (AER): 4.71% (MoneySavingExpert) ·
Top provider example: Moneybox (4.52% AER) ·
ISA annual allowance: £20,000 ·
Typical early withdrawal penalty: 90 days’ interest

Who is offering the best 2 year fixed rate ISA?

Top 2-year fixed ISA providers for 2026

• Secure Trust Bank – 4.72% AER (top rate per MSE) (MoneySavingExpert)
• Moneybox – 4.52% AER, minimum deposit £500, 180-day penalty (MoneySavingExpert)
• Virgin Money – 4.15% AER, minimum deposit £1, 90-day penalty (MoneySavingExpert)
• Lloyds Bank – 4.65% for two years (as of MSE table) (MoneySavingExpert)
• Zopa – typically around 4.5%, check MSE for latest (MoneySavingExpert)
• Coventry Building Society – often in top 5, rate varies (MoneySavingExpert)

The pattern: smaller niche banks like Secure Trust Bank lead on rate, while big high-street names like Lloyds and Virgin offer convenience at lower returns.

How to interpret the rates

The headline AER assumes interest is compounded annually and paid at maturity. Some providers pay monthly interest, which can boost effective return if reinvested. MoneySavingExpert notes that the top easy-access cash ISAs offering monthly interest can reach 5.07%, but fixed-rate accounts trade flexibility for a guaranteed rate.

Seven providers currently offer rates above 4.5% for a two-year fix, according to Money.co.uk. The pattern is clear: smaller banks and building societies lead, while big high-street names sit around 4.15%–4.65%.

What is the highest paying ISA at the moment?

Current best rates for easy access vs fixed

As of May 2026, the highest paying ISA overall is an easy-access account offering up to 5.07% AER (paid monthly) according to MoneySavingExpert. That’s higher than the best two-year fixed rate of 4.71%. But there’s a catch: the easy-access rate is variable and could drop at any time.

The catch: easy-access rates can drop at any time, so the headline 5.07% may not last.

Impact of monthly interest on total return

Accounts that pay interest monthly allow you to compound more frequently. On a £20,000 easy-access ISA at 5.07% paid monthly, total interest after one year is roughly £1,038 – about £60 more than if interest were paid annually. MoneySavingExpert says the rates “aren’t really lower than other accounts”.

The trade-off is that fixed-rate ISAs lock in the rate for the full term, protecting against any base rate cuts.

What is the Halifax 5.5 interest rate?

Halifax Regular Saver vs ISA

Halifax’s 5.5% rate is for a Regular Saver, not an ISA. Halifax offers this fixed-rate account for one year, but it has strict monthly deposit limits (max £250–£500 per month). That means the maximum you can save is £3,000–£6,000 over 12 months, far less than the ISA allowance. The interest is also taxable unless you use your personal savings allowance.

How the 5.5% rate works

• Fixed for 12 months at 5.5% AER
• Monthly deposits of £25 to £250 (or higher per T&Cs)
• No withdrawals allowed during the term
• After one year, money moves to a lower-paying account

For comparison, putting the same monthly amount into a 2-year fixed ISA at 4.71% would earn slightly less but keep the money tax-free and accessible after two years (with penalty). The pattern: regular savers suit disciplined savers with small pots; ISAs suit lump-sum or large monthly savers.

What is Santander 2 year fixed rate ISA?

Santander 2-year fixed ISA details

Santander offers a 2-year fixed rate ISA, but as of May 2026 the exact rate isn’t published in the comparison tables from MoneySavingExpert – it’s typically around 3.5%–4.0%, well below market leaders. Check Santander’s website for current rates.

How it compares to other providers

• Santander’s rate is unlikely to be top of the market (MoneySavingExpert)
• Early withdrawal penalty: usually 90 days’ interest
• Minimum deposit: often £500–£1,000

The implication: if you’re a Santander customer, convenience might be worth a lower rate. But for best returns, compare with Secure Trust Bank or Moneybox.

Is Lloyds Bank 5.25% fixed for one year?

Lloyds Monthly Saver account

Yes – Lloyds Bank offers a 5.25% fixed-rate account, but it’s a Monthly Saver, not an ISA. Lloyds Bank describes it as a one-year bonus rate on deposits up to £400 per month. The maximum total saved is £4,800. Interest is paid at maturity and is taxable unless you have a personal savings allowance.

• 5.25% AER fixed for one year
• Monthly deposit limit: £25–£400
• No access to money until maturity
• Not an ISA – interest counts toward your personal savings allowance

For someone wanting to save a lump sum tax-free, a 2-year fixed ISA at 4.71% is more suitable: you can deposit the full £20,000 and all interest is tax-free.

Comparing the top 2-year fixed ISAs

Five providers lead the market. The pattern: smaller niche banks offer higher rates, while big banks add convenience.

The implication: Secure Trust Bank leads on rate but demands a higher minimum deposit and longer penalty period, while Lloyds offers a competitive 4.65% with just £1 minimum and a shorter 90-day penalty.

Pros and cons of a 2-year fixed ISA

Clarity: what we know vs what’s uncertain

What Martin Lewis and other experts say

“Many of the top-pick paying easy-access cash ISAs pay interest monthly (up to 5.07%), and the rates aren’t really lower than other accounts.”

Martin Lewis, from a MoneySavingExpert Facebook post (as cited by MoneySavingExpert)

“The best two-year fixed ISA rate is 4.71% AER.”

Moneyfacts Compare, an independent rate comparison service (Moneyfacts Compare)

“Savers willing to lock money away for one or two years could earn up to 4.71% in a fixed ISA.”

MoneyWeek, a UK personal finance publication (MoneyWeek)

The consensus among experts is that 2-year fixed ISAs currently offer a slightly better rate than easy access (4.71% vs 4.62% according to Moneyfacts Compare), but the key difference is certainty. MoneySavingExpert advises locking in if you won’t need the money for two years.

For a saver in the UK with £20,000 to invest, the choice between a fixed and easy-access ISA comes down to rate stability vs flexibility. The pattern: if you can afford to lock away the full allowance, the top fixed rates give you a known return. If you think rates might rise, an easy-access ISA lets you ride the wave. MoneySavingExpert says many top easy-access accounts pay monthly interest at rates not far behind fixed-term products.

För sparare som vill låsa räntan i två år är Martin Lewis bästa 2-åriga fasta ISA ett av de mest pålitliga jämförelseverken för att hitta toppräntor och säkra erbjudanden.

Frequently asked questions

For more background on savings and regular savers, see our guide on First Direct Savings Account: 7% Regular Saver vs Competitors. You might also be interested in Martin Lewis Good Morning Britain: Badenoch Clash & Break.