Building Society Fixed Rate ISA Guide: Terms, Rates & Transfers

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UK Fixed Cash ISA Guide · September 2026

Building Society Fixed Rate ISA Guide: Terms, Rates & Transfers

A building society fixed rate ISA gives you a guaranteed tax-free savings rate for a set term, usually from one to five years. The trade-off is access: most fixed Cash ISAs restrict withdrawals, charge an interest penalty for early closure, or require you to close the whole account rather than take out a small amount.

Current building-society examples checked in September 2026 range from around 4.00% to 5.15% tax-free AER. The longest term does not automatically pay the highest rate, so compare the rate, fixed end date, early-access charge, funding window, ISA-transfer rules and maturity instructions together.

See September 2026 Rates ISA Transfer Rules Early Access Penalties
Rate warning: fixed ISA issues can disappear from sale quickly even though existing customers keep the rate they fixed. The figures below were checked against current provider pages on 22 September 2026. Re-open the individual Summary Box immediately before applying or transferring an ISA.

Independent guide. Building-society.org is not a building society, ISA manager, tax adviser, HM Revenue & Customs or the Financial Services Compensation Scheme.

Fixed Rate Cash ISA: Quick Answers

What is fixed? The interest rate is guaranteed for the stated term or until the stated maturity date.
Tax treatment Qualifying interest earned inside the Cash ISA is tax-free under ISA rules.
2026/27 ISA allowance The overall adult ISA subscription limit is £20,000 for the tax year ending 5 April 2027.
Can you transfer an old ISA? Yes where the receiving product accepts transfers. Use the formal ISA transfer process rather than withdrawing the money yourself.
Cash ISA transfer time Government guidance says a Cash ISA-to-Cash ISA transfer should normally take no more than 15 working days.
Can you withdraw early? Often only by paying an interest charge, and some products require complete closure rather than a partial withdrawal.
Can you keep adding money? Usually only during a limited funding window. Some products accept no further deposits after opening.
FSCS protection Eligible deposits are currently protected up to £120,000 per eligible person, per authorised firm.
Fast answer: a fixed rate ISA can suit money you want to keep tax-free and can leave largely untouched until a known future date. It is generally a poor home for emergency cash.

Building Society Fixed Rate ISA Rates: September 2026 Examples

These selected products show why you need to compare individual issues rather than assuming every one-, three- or five-year ISA pays a similar rate. They are a dated market snapshot, not a ranking of every available UK Cash ISA.

West Brom · 3 years 5.15% Tax-free p.a./AER fixed

3 Year Fixed Rate ISA

  • Fixed until 30 September 2029.
  • Open from £1.
  • Current-year ISA subscriptions plus accepted transfers.
  • Early access currently costs 240 days’ interest.
  • Rate page dated 16 September 2026.
Skipton · 5 years 4.76% Tax-free p.a./AER fixed

5 Year Fixed Rate Cash ISA

  • Open from £1.
  • ISA transfers accepted.
  • No normal partial withdrawals.
  • Early closure currently costs 365 days’ interest.
  • Funding deadline applies to the current issue.
Nationwide · 5 years 4.70% AER/tax-free fixed

5 Year Fixed Rate Cash ISA

  • Minimum opening amount: £1.
  • Must be funded during application.
  • No top-ups after opening.
  • Early access requires full closure.
  • Current 5-year charge: 300 days’ interest.
Skipton · 18 months 4.64% Tax-free p.a./AER fixed

18 Month Fixed Rate Cash ISA

  • Open from £1.
  • Shorter commitment than a 2- or 3-year ISA.
  • No normal withdrawals.
  • Early closure currently costs 90 days’ interest.
Leeds · 5 years 4.60% Tax-free p.a./AER fixed

5 Year Fixed Rate Cash ISA

  • Minimum opening amount: £100.
  • Branch, online and post opening currently offered.
  • Early withdrawals allowed under current terms.
  • Current penalty: 365 days’ interest.
Nationwide · 3 years 4.65% AER/tax-free fixed

3 Year Fixed Rate Cash ISA

  • Rate fixed for the term.
  • Minimum £1.
  • ISA transfer or Nationwide funding route.
  • Full closure for early access.
  • Current charge: 180 days’ interest.
Leeds · 1–3 years 4.50% Tax-free p.a./AER fixed

1, 2 and 3 Year Fixed Rate Cash ISAs

  • Current rate is 4.50% across all three terms checked.
  • Minimum £100.
  • Penalty rises with term length.
  • 90, 180 or 270 days’ interest respectively.
Coventry · fixed maturity 4.00%–4.20% Tax-free p.a./AER fixed

Fixed Rate ISA Issues 339–341

  • Current maturities run to December 2027, 2028 and 2029.
  • Open from £1.
  • Current- and previous-year transfers accepted.
  • No partial withdrawal after cancellation period.
  • Full closure charges apply.
Longer does not automatically mean better: West Brom’s current three-year ISA is showing a higher AER than several five-year products. A saver should therefore compare today’s actual issues rather than choosing a five-year term on the assumption that it must pay more.

How a Building Society Fixed Rate Cash ISA Works

A fixed Cash ISA combines two separate features. The ISA wrapper makes qualifying interest tax-free, while the fixed-term product guarantees the stated interest rate for the agreed period.

You choose a fixed term Common periods include one year, 18 months, two years, three years and five years.
The AER is guaranteed The provider does not normally change the rate during the fixed term.
Funding is restricted Many fixed ISAs accept subscriptions or transfers only during a short initial funding window.
Access is restricted You may have to close the ISA or pay a substantial interest charge to access money before maturity.
Interest stays tax-free Qualifying interest earned inside the ISA does not use your Personal Savings Allowance.
Maturity needs attention The provider will move or reinvest the balance according to its maturity process if you give no instruction.

1 Year, 2 Year, 3 Year or 5 Year Fixed ISA?

Match the fixed term to the date when you may actually need the money. The difference between two AERs can be much less important than being forced to break a fixed ISA early.

1 year Shorter commitment

Useful if you want rate certainty without committing for several years. It also gives you an earlier chance to compare the market again.

18 months Middle option

Less common but useful when a one-year term ends too soon and two years feels too long.

2 years Moderate lock-in

Gives two-year certainty while avoiding the longer rate and access commitment of a three- or five-year ISA.

3 years Longer certainty

Can be attractive when the current AER is strong, but early-access charges can be significantly larger than on a one-year product.

5 years Longest common term

Best suited to money you are confident you will not need. Compare the rate with shorter terms instead of assuming five years pays more.

Do not put emergency savings into a fixed ISA simply for the tax benefit. If you may need the money unexpectedly, compare easy-access or limited-access Cash ISAs first.

Current Building Society Fixed ISA Examples

5.15% example West Brom 3 Year Fixed Rate ISA

West Brom’s product page published on 16 September 2026 shows 5.15% tax-free p.a./AER fixed until 30 September 2029. The account opens from £1 and accepts ISA transfers, while early access currently results in 240 days’ loss of interest.

After opening this link:

  1. Confirm the 5.15% rate and make sure a newer issue has not replaced it.
  2. Read the fixed maturity date rather than assuming the term runs exactly three years from today.
  3. Check the 240-day early-access charge.
  4. Review the ISA transfer section if moving existing tax-free savings.
  5. Read the Specific Terms and Conditions before applying.

1–5 years Skipton Building Society Fixed Rate Cash ISAs

Skipton currently displays one-year, 18-month, two-year, three-year and five-year fixed Cash ISAs. Rates checked range from 4.00% to 4.76% tax-free AER, with early-closure penalties increasing as the term lengthens.

After opening this link:

  1. Compare all available terms rather than automatically choosing the longest.
  2. Check the final paying-in date for the issue you want.
  3. Open the Summary Box to see the early-closure interest penalty.
  4. Check whether interest is paid annually or monthly.
  5. Use Skipton’s ISA transfer route if moving an existing ISA.

1–5 years Nationwide Fixed Rate Cash ISA

Nationwide’s current range pays 4.50% to 4.70% AER/tax-free fixed across one-, two-, three- and five-year terms. A key restriction is that Nationwide currently requires the account to be funded during the application and does not allow top-ups afterwards.

After opening this link:

  1. Compare the current rates for all four terms.
  2. Decide whether you are funding with an ISA transfer or from a Nationwide account.
  3. Check Nationwide’s rule if you want to use both funding methods.
  4. Read the early-access charge for your term.
  5. Remember that early access requires the whole ISA to be closed under the current product rules.

£100 minimum Leeds Building Society Fixed Rate Cash ISAs

Leeds currently lists one-, two- and three-year fixed Cash ISAs at 4.50% and a five-year issue at 4.60% tax-free AER. The current annual-interest versions open from £100.

After opening this link:

  1. Filter for fixed-rate Cash ISAs.
  2. Compare the one-, two-, three- and five-year rates.
  3. Check whether you want annual interest or a monthly-income version.
  4. Read the 90-, 180-, 270- or 365-day interest charge that applies to early access.
  5. Check the latest funding and maturity dates before submitting an application.

Fixed maturity Coventry Building Society Cash ISAs

Coventry currently lists fixed ISA issues ending in December 2027, 2028 and 2029 at 4.00%, 4.10% and 4.20% tax-free AER respectively. Current- and previous-year ISA transfers are accepted.

After opening this link:

  1. Find the Fixed Rate ISA section rather than the variable Cash ISAs.
  2. Check the exact maturity date shown in the account name.
  3. Read the cancellation and early-closure rules.
  4. Check whether partial withdrawals are prohibited.
  5. Review the transfer rules before moving an existing ISA.

Fixed Rate ISA Early Withdrawal and Closure Penalties

Fixed Cash ISA rules are not identical across building societies. Some providers allow a partial withdrawal and charge lost interest on the amount withdrawn. Others permit access only by closing the entire ISA.

Provider / account
Rate
Term
Minimum
Current early-access rule
Nationwide Fixed ISA
4.50%
1 year
£1
Full closure; 60 days’ interest charge.
Leeds Fixed ISA
4.50%
2 years
£100
Withdrawal available with 180 days’ loss of interest.
West Brom Fixed ISA
5.15%
3 years
£1
Early access permitted with 240 days’ loss of interest.
Skipton Fixed ISA
4.76%
5 years
£1
Full early closure; 365 days’ interest penalty.
Nationwide Fixed ISA
4.70%
5 years
£1
Full closure; 300 days’ interest charge.
You can receive less than you originally paid in. Providers including Nationwide and Skipton warn that an early-closure charge can exceed interest already earned, particularly when an ISA is broken shortly after opening.
14-day cancellation period: several major building societies currently allow cancellation without the normal fixed-term access penalty during the initial 14-day period. Read the exact product terms because cancellation and ordinary early closure are different processes.

Fixed ISA Funding Windows: Do Not Miss the Paying-In Deadline

Unlike an easy-access Cash ISA, a fixed ISA may stop accepting deposits shortly after opening. That means you should check the final paying-in date before opening the account, especially when transferring another ISA.

Nationwide Its current fixed ISA must be funded during the application and cannot be topped up afterwards.
Skipton Current issues have a stated final paying-in date. Transfers must be available in time to meet that deadline.
Yorkshire Building Society YBS explains that its fixed ISAs generally permit additional money for at least 30 days after opening, subject to the product remaining available.
West Brom Current product terms allow additional money while the account remains on offer, subject to ISA and account limits.
Transfer timing matters: do not wait until the final funding day to start an ISA transfer. The receiving product may close to new money before the transfer can be completed.

How to Transfer an Existing ISA Into a Fixed Rate Cash ISA

An ISA transfer is different from withdrawing the money yourself. If you want existing ISA money to retain its ISA status, ask the new ISA provider to arrange the transfer.

  1. Choose a fixed ISA that accepts transfers. Check both the current AER and transfer deadline.
  2. Open the receiving ISA if the provider requires this first.
  3. Tell the new ISA manager you want to transfer an existing ISA.
  4. Complete its online or paper ISA transfer authority.
  5. Give details of the old ISA. This normally includes provider and account information.
  6. Let the providers move the money. Do not normally withdraw it to your current account yourself.
  7. Check any charge for breaking the old fixed ISA.
  8. Confirm the money reached the new fixed ISA before its funding deadline.
Transfer allowance: transferring eligible ISA money is not the same as making a fresh subscription. Previous-year ISA money can therefore be transferred without simply being added to this year’s £20,000 subscription figure, subject to ISA and provider rules.
Cash ISA transfer timescale: GOV.UK states that transfers between Cash ISAs should normally take no longer than 15 working days. Other types of ISA transfer generally have a 30-calendar-day guideline.

Official transfer rules GOV.UK ISA Transfer Guidance

After opening this link:

  1. Read the section explaining provider-to-provider ISA transfers.
  2. Check whether you want to transfer all or only part of an ISA.
  3. Contact the provider receiving the money.
  4. Complete its ISA transfer form.
  5. Check charges or access restrictions on the ISA you are leaving.
  6. Do not withdraw the ISA yourself when you want to preserve the existing tax-free wrapper.

Building society example Yorkshire Building Society ISA Transfers

After opening this link:

  1. Choose whether the existing ISA is with YBS or another provider.
  2. If opening online, check when the transfer option becomes available.
  3. Use the transfer form for branch/post accounts where required.
  4. Check the terms of both the old and new ISA.
  5. Keep confirmation when the transfer has completed.

Cash ISA Rules Change From 6 April 2027

The current 2026/27 ISA allowance is £20,000. That remains the relevant limit until 5 April 2027.

From 6 April 2027, the UK government is reducing the annual Cash ISA subscription limit for people under 65 to £12,000 within the continuing £20,000 overall ISA limit. People aged 65 or over will retain a £20,000 Cash ISA limit.

2026/27 tax year

  • Overall ISA limit: £20,000.
  • Cash ISA can currently use up to the full £20,000 allowance.
  • Current transfer rules continue until the tax year ends.

From 6 April 2027

  • Under 65: Cash ISA subscription limit becomes £12,000.
  • Age 65+: Cash ISA limit remains £20,000.
  • Overall annual ISA limit remains £20,000.
  • New restrictions apply to transfers from non-Cash ISAs into Cash ISAs for people under 65.
Important transfer change: from 6 April 2027, people under 65 will no longer be able to transfer money from Stocks and Shares ISAs or Innovative Finance ISAs into Cash ISAs under the new rules. Transfers from Cash ISAs to non-Cash ISAs remain possible. The restriction is disapplied for those aged 65 or over.

Official September 2026 policy HMRC Cash ISA Limit Reduction

After opening this link:

  1. Check the operative date of 6 April 2027.
  2. Read the £12,000 rule for people under 65.
  3. Read the £20,000 rule for people aged 65 or over.
  4. Review the new restrictions on transfers into Cash ISAs.
  5. Remember that these future rules do not reduce the current 2026/27 £20,000 allowance.

What Happens When a Fixed Rate ISA Matures?

Your fixed rate ends at maturity. The building society will normally contact you before that date and explain your options. Do not assume the account will simply become penalty-free cash without any action.

Move to another Cash ISA You can select another ISA with the same provider if a suitable product is available.
Transfer to another provider Use the receiving provider’s ISA transfer process if you want to preserve ISA status.
Withdraw the money You can take money out after maturity, but withdrawing it outside the ISA can permanently remove that amount from the existing ISA wrapper.
Do nothing Your provider’s default maturity instruction applies. This may mean another fixed ISA or an instant-access ISA.
Examples differ: Nationwide currently says its fixed ISA balance moves into an instant-access Cash ISA at the end of the term. Skipton says its fixed ISAs normally move into a new one-year fixed Cash ISA unless you instruct it otherwise.
Read the maturity letter rather than ignoring it. The provider’s default account may not have the rate, term or access you would choose yourself.

Fixed Rate ISA vs Easy-Access Cash ISA

A fixed rate ISA may suit you if

  • You want a guaranteed tax-free rate.
  • You have a lump sum ready to deposit or transfer.
  • You know roughly when you will need the money.
  • You can keep emergency cash elsewhere.
  • You would not be worried if variable savings rates rise during the fixed term.

An easy-access ISA may suit you if

  • You may need withdrawals at short notice.
  • You want to keep adding savings throughout the tax year.
  • You do not want a large early-access charge.
  • You accept that the interest rate can go up or down.
  • Flexibility matters more than locking today’s rate.

What Fixed ISA Rates Mean in Pounds

These simple one-year illustrations show the difference between rates before considering multi-year compounding. They assume the stated fixed AER applies and the balance remains untouched.

£515 Approximate first-year interest on £10,000 at 5.15% AER.
£476 Approximate first-year interest on £10,000 at 4.76% AER.
£470 Approximate first-year interest on £10,000 at 4.70% AER.
£450 Approximate first-year interest on £10,000 at 4.50% AER.
£420 Approximate first-year interest on £10,000 at 4.20% AER.
A multi-year ISA can compound if interest remains in the account. The actual maturity value depends on the rate, exact term, interest-payment frequency and whether interest is added to the ISA or paid elsewhere.

Are Fixed Rate Cash ISAs Protected by FSCS?

Eligible Cash ISA deposits with a UK-authorised bank, building society or credit union are currently protected by the Financial Services Compensation Scheme up to £120,000 per eligible person, per authorised firm.

£120,000 standard protection The standard deposit-protection limit increased from £85,000 to £120,000 on 1 December 2025.
It is not £120,000 per ISA Eligible balances under the same authorised firm are considered together.
Joint accounts Cash ISAs themselves are individual accounts, but other eligible joint deposits may also count when assessing your overall protection position.
Temporary high balances FSCS currently provides up to £1.4 million of temporary protection for certain qualifying life-event balances for up to six months.
Maximum product balance is not the FSCS limit. A building society may allow an ISA balance far above £120,000 through transfers accumulated over multiple tax years, while the ordinary FSCS protection limit remains £120,000 per eligible person per authorised firm.

Official protection FSCS Deposit Protection Limit

After opening this link:

  1. Confirm the current £120,000 standard limit.
  2. Use the FSCS checker if you save with several brands.
  3. Check whether any brands share the same banking licence.
  4. Add together your eligible balances under that authorised firm.
  5. Check temporary-high-balance rules separately if a qualifying life event applies.

Checklist Before Opening a Fixed Rate Cash ISA

Confirm the live fixed AER.
Check the exact maturity date.
Check the minimum opening balance.
Check the maximum balance.
Check the final paying-in date.
Check whether further deposits are allowed.
Check whether ISA transfers are accepted.
Check the transfer request deadline.
Read the early-access charge.
Check partial withdrawal vs full closure rules.
Check annual vs monthly interest options.
Read the maturity default.
Keep emergency cash outside the fixed ISA.
Check your total ISA subscriptions for 2026/27.
Check FSCS exposure across the provider.
Save the Summary Box and terms.

Common Fixed Rate ISA Mistakes

Assuming five years pays the most Current product pricing can make a shorter term pay a higher rate than a longer term.
Missing the funding deadline A fixed ISA may close to additional payments while the account itself remains open for its fixed term.
Withdrawing an old ISA yourself Use the official ISA transfer process when you want the money to retain existing ISA status.
Ignoring early-access maths A 240- or 365-day interest charge can remove a meaningful part of the return and may sometimes reduce capital.
Assuming partial withdrawals are allowed Nationwide and Skipton currently require full closure for ordinary early access to the fixed products reviewed.
Using the whole emergency fund A tax-free rate is little comfort if you must break the account when an unexpected bill arrives.
Ignoring maturity instructions The default rollover account can be different from the term or access you actually want next.
Using outdated ISA rules The 2026/27 £20,000 Cash ISA position changes for under-65s from 6 April 2027.

Related Building Society Savings Guides

Nationwide Building Society Savings Rates 2026: Accounts & ISAs Yorkshire Building Society Savings Rates 2026: Accounts & ISAs Coventry Building Society Savings Rates 2026: Accounts & ISAs West Brom Building Society: Savings, Mortgages & Online Services
Compare the account structure as well as the provider. A fixed ISA, easy-access ISA, regular saver and ordinary fixed bond solve different savings problems even when their headline rates look similar.

Official Sources Used for This Fixed Rate ISA Guide

West Brom 3 Year Fixed Rate ISA West Brom Cash ISAs Skipton Fixed Rate Cash ISAs Nationwide Fixed Rate Cash ISA Leeds Building Society Cash ISAs Coventry Building Society Cash ISAs Yorkshire Building Society Cash ISAs YBS Fixed Rate Cash ISA Guide YBS ISA Transfer Guidance GOV.UK ISA Overview GOV.UK ISA Transfers HMRC 2027 Cash ISA Changes FSCS Deposit Protection

How This Guide Was Checked

West Brom September 2026 fixed ISA checked.
Skipton fixed ISA rate range checked.
Skipton early-closure charges checked.
Nationwide 1–5 year rates checked.
Nationwide funding restrictions checked.
Nationwide early-access charges checked.
Leeds 1–5 year ISA rates checked.
Leeds interest penalties checked.
Coventry current fixed issues checked.
2026/27 ISA allowance checked.
Cash ISA transfer timescale checked.
April 2027 Cash ISA reform checked.
Current £120,000 FSCS limit checked.

Editorial review: 22 September 2026. Fixed rates are guaranteed only after you successfully open the applicable product under its terms. Product availability to new applicants can change without the existing fixed rate changing.

Independent Financial Information Notice

Building-society.org is an independent informational website. It is not Nationwide Building Society, Skipton Building Society, Leeds Building Society, Coventry Building Society, West Brom Building Society, Yorkshire Building Society, HM Revenue & Customs, the Financial Conduct Authority, Prudential Regulation Authority or Financial Services Compensation Scheme.

This page provides general information rather than personalised financial or tax advice. Your most suitable ISA depends on your access needs, tax position, savings goals, existing ISAs and the rates available when you actually apply.

Verify before transferring money: check the provider’s genuine website, the current issue name, AER, maturity date, early-access charge, funding deadline and ISA transfer instructions before sending a deposit or authorising a transfer.

Building Society Fixed Rate ISA FAQs

1. What is a building society fixed rate ISA?

A building society fixed rate ISA is a Cash ISA that pays a guaranteed tax-free interest rate for a stated term or until a specified maturity date. Access is normally restricted during the fixed period and early withdrawals or closure can result in an interest charge.

2. What fixed rate Cash ISA rates are building societies paying in September 2026?

Selected building-society products checked on 22 September 2026 range from about 4.00% to 5.15% tax-free AER. Examples include West Brom’s 3 Year Fixed Rate ISA at 5.15%, Skipton’s 5 Year Fixed Rate Cash ISA at 4.76%, Nationwide’s five-year ISA at 4.70% and Leeds’ five-year ISA at 4.60%. Product availability can change quickly.

3. How much can I put into a Cash ISA in the 2026/27 tax year?

The overall adult ISA subscription allowance for 6 April 2026 to 5 April 2027 is £20,000. Under the current 2026/27 rules, that full amount can be subscribed to Cash ISAs, subject to your total subscriptions across ISAs not exceeding the overall limit.

4. Can I transfer an old ISA into a fixed rate Cash ISA?

Yes, if the receiving fixed ISA accepts transfers. Ask the receiving ISA manager to arrange the transfer. Do not normally withdraw the existing ISA money into your current account and then pay it into the new ISA, because doing so can remove the existing ISA status of that money.

5. How long should a Cash ISA transfer take?

GOV.UK states that transfers between Cash ISAs should normally take no longer than 15 working days. A fixed-rate provider can also impose a funding or transfer deadline, so begin the transfer early enough to meet the receiving product’s terms.

6. Can I withdraw from a fixed rate ISA before it matures?

Often yes, but the rules depend on the product. Some providers allow withdrawal with an interest penalty, while others require you to close the whole ISA. Nationwide’s current fixed ISA requires full closure and charges between 60 and 300 days’ interest depending on term.

7. Can an early-closure penalty reduce my original fixed ISA deposit?

It can. Some providers warn that if the interest charge is greater than the interest earned before early closure, you may receive less than you originally paid into the account. This is particularly relevant when closing soon after opening.

8. What happens to my fixed ISA when it matures?

The provider will normally give you maturity options shortly before the fixed term ends. You may be able to transfer to another ISA, withdraw money or select another product. If you do nothing, the provider’s default maturity process applies, which can mean an instant-access ISA or another fixed ISA.

9. Is the Cash ISA allowance changing in April 2027?

Yes. From 6 April 2027, the annual Cash ISA subscription limit for people under 65 will be £12,000 within the continuing £20,000 overall ISA limit. People aged 65 or over will retain a £20,000 Cash ISA limit. New restrictions will also apply to transfers from non-Cash ISAs into Cash ISAs for under-65s.

10. Are building society fixed rate ISAs protected by FSCS?

Eligible deposits with a UK-authorised bank, building society or credit union are currently protected up to £120,000 per eligible person, per authorised firm. The limit applies across eligible deposits held with the authorised firm, not separately to each fixed ISA.

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