IG 5% Interest Offer: Earn 5.00% AER on Uninvested Cash (June 2026)

Q: How much cash earns the 5% rate?

IG pays the boosted 5.00% AER on uninvested GBP cash up to GBP 75,000. Balances above that earn IG's standard variable rate, and cash over GBP 300,000 in a new Share Dealing Account earns nothing.

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IG is paying new clients a boosted 5.00% AER variable on uninvested cash through June 2026. Open a Share Dealing Account during the month, apply promo code JUNINTER375, and invest at least £2,000 by 30 June, and IG pays the boosted rate on balances up to £75,000 for a full 12 months. Here is how the offer works and who it suits.

JUNE 2026 OFFER

5.00% AER

Boosted variable interest on uninvested GBP cash, on balances up to £75,000, paid for 12 months.

Account

Share Dealing Account (GIA)

Who

New IG clients

Min investment

£2,000 by 30 June 2026

Max balance

£75,000

Boost period

12 months (to 30 June 2027)

Interest paid

Monthly

Promo code

JUNINTER375

How the IG 5% interest offer works

The offer rewards new clients who fund a Share Dealing Account during June 2026. Once you apply code JUNINTER375 and meet the funding requirement, IG pays 5.00% AER variable on the cash sitting uninvested in your account, up to a £75,000 balance. IG credits the interest monthly, so it compounds across the 12-month boost period that runs to 30 June 2027.

The rate is variable, which means IG can change it during the boost period. The 5.00% headline applies to the first £75,000 of uninvested cash. Balances above the boosted tier earn IG's standard variable rate, and IG pays no interest on cash over £300,000 in a new Share Dealing Account.

What you need to qualify

Open a new IG Share Dealing Account (GIA) during June 2026. The boosted rate is not available on a new ISA or SIPP.
Apply promo code JUNINTER375 when you open the account.
Make a net investment of at least £2,000 by 22:00 on 30 June 2026.
Keep an average invested value of at least £2,000 across the full 12-month boost period.

Miss the average-invested condition and you drop to IG's standard rate. The boost is designed for investors who plan to stay invested, not for parking cash and pulling it straight back out.

Is 5% AER actually good?

For a brokerage paying interest on uninvested cash, 5.00% is a strong headline rate. It sits above the standard rates most UK investment platforms pay on idle cash, and it beats many easy-access savings accounts. Two things keep it honest: the rate is variable, and it only runs for 12 months before reverting. If you hold a large cash buffer inside a brokerage between trades, the boost is worth claiming. If you intend to be fully invested, the cash interest matters less than the platform and dealing costs.

For the wider market, see our ranking of the best high-yield savings accounts in the UK, and IG's other live deals on our IG UK offers page.

Frequently Asked Questions

What is the promo code for IG's 5% interest offer?

The code is JUNINTER375. Apply it when you open a new IG Share Dealing Account during June 2026 to qualify for the boosted 5.00% AER rate.

How much cash earns the 5% rate?

IG pays the boosted 5.00% AER on uninvested GBP cash up to £75,000. Balances above that earn IG's standard variable rate, and cash over £300,000 in a new Share Dealing Account earns nothing.

Can I get the 5% rate in an ISA or SIPP?

No. For new customers the boosted rate applies to the Share Dealing Account (GIA) only. A new ISA or SIPP is not eligible for this June offer.

How long does the boosted rate last?

The boost runs for 12 months, from 1 July 2026 to 30 June 2027. IG credits the interest monthly and the rate is variable throughout.

What is the deadline?

You must open the account, apply code JUNINTER375, and make a net investment of at least £2,000 by 22:00 on 30 June 2026.

DisclaimerTrading involves significant risk and may not be suitable for all investors. The value of investments can go down as well as up, and you may lose some or all of your initial investment. Past performance is not indicative of future results. The 5.00% AER rate is variable and applies for a limited period subject to IG's terms and conditions. This article is information, not investment advice. Do your own research. We may earn a commission from some of the brokers mentioned if you open an account through our links, at no extra cost to you.