What interest rate does the NS&I Guaranteed Growth Bonds - 3 Year pay?

The NS&I Guaranteed Growth Bonds - 3 Year pays 5.10% AER, fixed for 3 years.

How much interest could I earn?

Saving £10,000 for 3 years would earn about £1,609 at 5.10% AER. This assumes the rate stays the same and interest stays in the account.

How much can I pay in?

You can deposit at least £500 and up to £1,000,000.

Can I withdraw my money?

No. Your money is locked in until the fixed term ends, so only put in what you won't need before then.

When is interest paid?

Interest is paid at the end of the term.

Who can open this account?

New and existing NS&I customers can open it. You can open it online.

Is my money protected?

Yes. NS&I is backed by HM Treasury, so every penny is guaranteed. It isn't part of the FSCS, so the £120,000 FSCS limit doesn't apply.

How does it compare with other three-year fixed rate bonds?

At 5.10% AER it ranks 6th of 48 three-year fixed rate bonds we track. The best pays 5.18% and the average is 4.68%.

Dashboard

Fixed Rate

NS&I Guaranteed Growth Bonds - 3 Year Review

One of the best-paying three-year fixed rate bonds, from NS&I. It ranks 6th of 48 three-year fixed rate bonds we track.

Rate checked Oct 2026Got this account? Leave a review

Fixed rate · 3 years

5.10%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

100% backedby HM Treasury

Min balance

£500

Max balance

£1,000,000

Access

At maturity only

Interest paid

On maturity

How It Stacks Up

Ranks 6th of 48

3-year fixed bonds we track

Among the best

This account 5.10%

UK CPI (Aug 2026): 3.10%; Pays 2.00% more
Average 3-year fixed: 4.68%; Pays 0.42% more
Best 3-year fixed: 5.18%; Pays 0.08% less

Inflation: ONS. Averages and best rates: accounts on DepositScout.

Compare fixed bonds

Pros and cons

Pro: New and existing savers
Con: Your money is locked in for 3 years

Please verify all details with the provider – see our Disclaimer

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Estimated returns with NS&I's Fixed Rate

What you could earn with NS&I's Guaranteed Growth Bonds - 3 Year.

Estimated interest

£1,000 saved

£161

At 5.1% AER

£5,000 saved

£805

At 5.1% AER

£10,000 saved

£1,609

At 5.1% AER

£1,000,000 saved

£160,936

At 5.1% AER

Estimated over the 36-month term, if the rate stays the same and interest is left in. Amounts outside the account's minimum or maximum aren't shown.

Work out the tax on your interestSee how much of this interest could be taxed.

Our Expert Opinion on NS&I Guaranteed Growth Bonds - 3 Year

Jan WatermannCo-Founder, DepositScout

NS&I's Guaranteed Growth Bonds pay 5.10% fixed over three years, which sits above the market average for fixed-rate accounts, though it is 0.25% behind the category leader at 5.35%. The rate beats CPI inflation by 2.00% (August 2026 figure of 3.1%), so you are getting real growth. The main catch is that your money is completely locked away until maturity, with no access at all. You can deposit between £500 and £1,000,000, and if you prefer monthly interest, NS&I's own Guaranteed Income Bonds offer the same 5.10% rate.

Compare Fixed Rate Bonds

2 alternatives to NS&I's Guaranteed Growth Bonds - 3 Year3 alternatives to NS&I's Guaranteed Growth Bonds - 3 Year

Same type of account, closest on rate.

Common questions about the Guaranteed Growth Bonds - 3 Year

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