XTB Cash ISA Review 2026: 4.00% AER Variable Rate Explained
XTB, one of Europe's largest listed brokers, offers a Cash ISA for UK residents. The current rate is 4.00% AER variable, which keeps XTB competitive with other standard variable Cash ISAs, although it is no longer the highest headline rate in the market.
The 6.00% AER launch promotion has ended. It applied only to eligible ISAs opened between 1 March and 30 April 2026 and is closed to new applicants. We reviewed the XTB Cash ISA as it stands now to help you decide whether it is the right fit for your savings.
What Is the XTB Cash ISA?
XTB, one of Europe's largest listed brokers, has launched a Cash ISA that allows UK residents to save up to £20,000 per tax year with all interest earned completely tax-free. The ISA is available to both new and existing XTB clients.
The current rate is 4.00% AER variable. XTB previously ran a launch promotion that paid 4.00% plus a 2.00% boost for the first 90 days, but that offer applied only to eligible ISAs opened between 1 March and 30 April 2026. It is no longer available to new applicants.
Because the rate is variable rather than fixed, XTB can change it. Check the current rate on XTB's own ISA pages before you open an account. There is no minimum or maximum amount of free funds required to earn interest, so the rate applies across your whole ISA balance.
Flexible ISA: Withdraw Without Losing Allowance
One of the standout features of the XTB Cash ISA is its flexibility. This means you can withdraw funds and replace them within the same tax year without it counting against your £20,000 annual ISA allowance.
For example, if you deposit £15,000, withdraw £5,000 for an unexpected expense, and then replace that £5,000 later in the tax year, your remaining allowance is still £5,000 rather than zero. This is a meaningful advantage for savers who want access to their funds without penalty.
Cash ISA transfers into XTB are not currently supported. XTB says this service is coming soon, so for now you cannot move an existing ISA balance across from another provider.
How Does the XTB Cash ISA Compare?
At 4.00% AER variable, XTB sits mid-table in the UK Cash ISA market. The higher headline rates on offer are conditional first-year promotions rather than ongoing rates. eToro currently leads on the headline figure at 4.87% AER variable for eligible new Moneyfarm customers, made up of a 3.87% AER standard introductory rate plus a 1 percentage point boost paid after the first 12 months, with a £500 deposit or £5,000 transfer minimum, no more than three withdrawals during the first 12 months, and a standard rate of 3.57% AER after that. Plum pays 4.40% AER in the first year including a 1.86 percentage point bonus, then 2.54% ongoing. When comparing Cash ISAs, it is worth weighing the introductory rate against the ongoing one.
XTB no longer leads on headline rate. What it offers instead is a single standard variable rate with no bonus period to track, unlike the first-year promotions from eToro and Plum. The rate is variable and XTB can change it, so check the current figure before you commit.
For a full side-by-side comparison of all providers, see our Best Cash ISAs UK 2026 ranking.
Pros and Cons
Who Is the XTB Cash ISA Best For?
The XTB Cash ISA suits savers who want a competitive variable rate without bonus expiry dates or promotional conditions to monitor. It also suits anyone looking to use their £20,000 allowance for the 2026/27 tax year, which runs to 5 April 2027.
It is also a solid option for existing XTB clients who already use the platform for trading or investing and want to keep their savings under one roof.
If you want the highest possible first-year return and are willing to meet the conditions attached, compare XTB with eToro at 4.87% AER in year one or Plum at 4.40% AER in year one. Atom Bank at 4.25% AER is a standard variable alternative that currently sits above XTB. For a full side-by-side comparison, see our Best Cash ISAs UK 2026 overview.
If you have already used your ISA allowance or want additional savings options, see our best high-yield savings accounts UK comparison.
How to Open the XTB Cash ISA
About XTB
XTB is one of Europe's largest publicly listed investment platforms, with a presence in multiple countries. In the UK, XTB Limited is authorised and regulated by the Financial Conduct Authority (FCA) under licence number FRN 522157, with offices at One Canada Square, Canary Wharf, London.
The platform offers a range of investment products including stocks, ETFs, and CFDs alongside the newly launched Cash ISA. XTB has built a reputation for competitive pricing and a well-designed trading platform (xStation).
Frequently Asked Questions
What is the XTB Cash ISA interest rate?
The current rate is 4.00% AER variable. The 6.00% AER launch promotion has ended: it applied only to eligible ISAs opened between 1 March and 30 April 2026 and is closed to new applicants. As the rate is variable, XTB can change it, so check the latest figure before opening or transferring.
Is the XTB Cash ISA flexible?
Yes. You can withdraw and replace funds within the same tax year without it counting against your annual £20,000 ISA allowance. Transfers in from other ISA providers are not supported yet.
Who is eligible for the XTB Cash ISA?
Both new and existing XTB clients can open a Cash ISA. You must be a UK resident aged 18 or over.
Is XTB regulated in the UK?
Yes. XTB Limited (UK) is authorised and regulated by the Financial Conduct Authority under licence number FRN 522157.
Can I transfer my existing ISA to XTB?
Not at the moment. XTB does not currently support Cash ISA transfers in and says this service is coming soon. Check XTB's own ISA pages for the latest position before planning a transfer.
The XTB Cash ISA pays 4.00% AER variable. Interest rates shown are correct as of 3 August 2026 and may change. Variable rates are subject to change without notice. Eligible deposits are protected by the Financial Services Compensation Scheme up to £120,000 per person, per authorised provider. Tax treatment depends on individual circumstances and may change in the future. Cash ISA transfers into XTB are not currently supported. T&Cs apply. MatchMyBroker does not offer investment products or advisory services. The content is for informational purposes only and may not be accurate or complete. Please do your own research. This content contains affiliate links. We may earn a commission if you sign up through them, at no extra cost to you.
