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Should you stay with Moneybox after a savings bonus ends?

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UKPublished 6 October 2026 · Written by BuyMeWhiskey Editorial Team · How we check facts

Do not decide solely because an introductory bonus has ended. Compare the ongoing interest rate, access rules, withdrawal limits, fees, tax wrapper and FSCS protection against alternatives, then judge the account on its terms after the bonus rather than its launch rate.

Next question: How can you tell if a cash ISA provider is safe? →

Check the current Moneybox account terms and FSCS protection before deciding whether to stay or transfer.

Check FSCS deposit protection

Run your own numbers: Compound interest and savings calculator.

Treat a bonus as a temporary feature

An introductory savings bonus can make an account look better at first and much less attractive later. The lasting question is what rate and conditions apply after the bonus period. That is the number to compare with other accounts.

Moneybox currently advertises Cash ISA products with variable rates and temporary bonus elements. The company also says the interest rate can change. Because those features can change, do not build a long-term decision around a promotional rate that is designed to expire.

Compare the post-bonus account

Write down five things: the ongoing rate, whether the rate is variable, how quickly you can withdraw, whether there are withdrawal limits or conditions, and whether there are fees. Then compare those features with other eligible accounts.

A slightly lower rate can still be reasonable if it buys you easier access. A higher rate may be less useful if you repeatedly need the money and the account restricts withdrawals or imposes notice periods.

Check how your cash is protected

From 1 December 2025 the FSCS deposit protection limit has been £120,000 per eligible person, per authorised firm. That limit applies to eligible deposits with UK-authorised banks, building societies and credit unions. Money held with different brands can still share a banking licence, so check the underlying authorised firm rather than assuming each brand gets a separate allowance.

Moneybox says its Cash ISA and Open Access Cash ISA use a panel of third-party banks and that eligible deposits are protected up to the FSCS limit at each authorised bank. That structure is different from simply holding an investment fund, where FSCS rules are different.

Remember the ISA tax wrapper

For the 2026/27 tax year, the overall ISA subscription limit is £20,000. The government has confirmed that from 6 April 2027 the annual Cash ISA limit will be £12,000 for people under 65, while the overall ISA limit remains £20,000. Existing Cash ISA balances are not turned into taxable money by that change.

If you are comparing a Cash ISA with an ordinary savings account, compare the after-tax result, not just the advertised interest rate. A cash ISA shelters interest within the ISA rules, which can matter more to a higher-rate taxpayer or someone with substantial savings.

Access matters more than a headline rate

An easy-access account is useful for emergency savings. A notice or fixed-term account can pay differently because you give up some access. Before transferring, check whether you can withdraw without losing interest or breaching a condition, and whether a transfer-out process itself takes time.

For an ISA transfer, use the provider's formal ISA transfer route. Do not withdraw ISA money into your current account simply because moving it that way feels faster. GOV.UK explains that transfers are designed to move the ISA tax wrapper from one provider to another.

When staying can make sense

The post-bonus rate remains competitive.
You value the app or access features.
The withdrawal conditions suit your needs.
The account is covered by the protection you need.
You would lose a meaningful benefit by moving, such as a fixed rate or a useful product feature.

Do not stay simply because moving feels like effort. Savings rates change, and a five-minute comparison can expose a large difference on a sizeable balance.

When a transfer may make sense

A transfer is worth considering when the ongoing rate is materially below comparable accounts, the access terms no longer suit you, or you have a clear reason to consolidate elsewhere. Check whether the alternative is authorised and protected before moving.

A simple annual review

Put the bonus-end date in your calendar. On that date, check the actual rate you are earning, the conditions, and two or three alternatives. That turns an easy-to-forget promotional feature into a routine savings review.

Illustrative one-year interest comparison on £20,000

Worked example

Illustrative rate comparison: suppose £20,000 is held for a year. At an illustrative 4.00% rate, the simple one-year interest comparison is £20,000 × 4% = £800. At an illustrative 3.25% rate, it is £20,000 × 3.25% = £650.

Difference: £800 − £650 = £150.
The £20,000 principal is the same in both cases.

These rates are illustrative, not current Moneybox rates. Real savings products can compound, change rates and impose conditions, so the comparison should be rerun using the rates and rules available when you actually make the decision.

Because this is an ISA, the comparison should also distinguish the tax wrapper from the underlying savings product. A transfer can preserve the ISA wrapper when completed through the correct transfer process, whereas withdrawing first can create a different tax situation.

What happens when a Moneybox savings bonus ends?#

The temporary bonus no longer contributes to the rate once its stated period or conditions end. The account may remain open with a different ongoing rate. Check the live product terms and compare that post-bonus rate with alternatives before deciding whether to stay.

Is Moneybox Cash ISA money FSCS protected?#

Moneybox says its Cash ISA funds are deposited with a panel of third-party banks and eligible deposits are protected by FSCS up to the applicable limit at each authorised bank. FSCS says the deposit limit is £120,000 per eligible person per authorised firm.

Should I move my savings when the bonus ends?#

Not automatically. Compare the post-bonus rate, access rules, fees, tax treatment and protection. A move makes more sense when the difference is material and the alternative account still fits how you use the money. Check the provider details and permissions before transferring money.

Does the £20,000 ISA allowance still apply in 2026/27?#

Yes. The overall ISA subscription limit for 2026/27 is £20,000. The government has also confirmed that the Cash ISA limit for people under 65 falls to £12,000 from 6 April 2027, while the overall ISA limit remains £20,000.

Should I withdraw a Cash ISA before transferring it?#

Normally no. Use the formal ISA transfer process. Withdrawing the money yourself can change how the transfer interacts with your ISA allowance and removes the straightforward provider-to-provider transfer of the tax wrapper. Check both the firm and the banking partners shown in its protection information.

Is a higher savings rate always better?#

No. Access, withdrawal conditions, fees, tax treatment and protection can matter as much as the rate. A slightly lower rate can be preferable for an emergency fund if it gives immediate access, while a notice account may suit money you know you will not need soon.

How much cash is protected by FSCS in 2026?#

The FSCS deposit protection limit is £120,000 per eligible person, per authorised firm for qualifying deposits. Accounts with different trading brands can share an underlying banking licence, so the limit may apply to the combined balance with that authorised firm.

Keep reading

Next question →How can you tell if a cash ISA provider is safe?

Sources

Figures were checked against these sources before publication. If a rule changes, we update the page and show the new date.

General information, not personal financial advice. Rules depend on your circumstances; check the official source or speak to a regulated adviser before acting.