Your capital is at risk. The value of your investments can go down as well as up. You may get back less than you invest.
IG Invest Offer Summary
Deadline: 30/06/2026. Complete your sign-up before this date.
About IG Invest
Commission-free UK stock trading with interest on cash balances. Trusted by 2M+ investors worldwide. No custody, trading, or inactivity fees.
Scrimpr Pro Tip
The boost only applies to uninvested CASH up to £20,000, not to the value of your investments. The standard rate (3.75% AER) still applies above £20,000 and on cash in other IG accounts. To stay eligible each month, your Average Invested Value in the Boosted Account must be £2,000+ — market drops don't disqualify you (clause 8), but selling down does. The boost runs for 12 months from your first investment until 30 June 2027. You can ONLY pick one IG promotion — the Cashback Offer (JUNECASH500) or Transfer Offer (TRANSFER5000) cannot be stacked with this. Pick this one only if you genuinely want to hold significant uninvested cash with IG; otherwise the Cashback Offer usually pays more.
How To Get This Deal
Step 1 — Open an IG Share Dealing Account
Must be new to IG (no prior account of any kind). UK resident, 18+. Apply promo code JUNEINTEREST5 when signing up between 1-30 June 2026. Pick GIA, ISA or SIPP - this becomes your Boosted Account.
Step 2 — Invest at least £2,000 in June
Make Net Investments of £2,000+ in the Boosted Account by 22:00 on 30 June 2026. Asset transfers from other providers don't count.
Step 3 — Maintain £2,000+ average invested
Each calendar month from 1 July 2026 to 30 June 2027, your Average Invested Value must be £2,000+ to qualify for that month's boosted rate. Market drops don't disqualify you; voluntary sales do.
Step 4 — Hold uninvested cash to earn 5%
Any uninvested cash balance up to £20,000 in the Boosted Account earns 5.00% AER variable. Cash above £20k or in other IG accounts earns the standard 3.75% AER.
Step 5 — Interest credited monthly
Boosted interest is paid monthly into your Boosted Account. After 30 June 2027 the rate reverts to standard 3.75% AER.
Costs & Fees to Know
| Cost | Amount | Avoidable? | How to Avoid |
|---|---|---|---|
| Stamp duty | 0.5% on UK stocks | no | unavoidable |
| Currency fee | 0.7% on non-UK stocks | yes | stick to UK stocks only |
Important Information
- This offer is for new customers only.
- You must be at least 18 years old.
- Your capital is at risk. The value of your investments can go down as well as up. You may receive back less than you invest.
- New IG customers only (no prior IG account of any kind)
- UK resident, 18+
- Must apply promo code JUNEINTEREST5 when opening a Share Dealing Account (GIA, ISA or SIPP) between 1-30 June 2026
- Net Investment of at least £2,000 in the Boosted Account by 22:00 on 30 June 2026 (asset transfers in don't count)
- Boosted Account is whichever Eligible Account your first investment is made in
- Boost Period runs 12 months from first investment until 22:00 on 30 June 2027
- Boosted rate is 5.00% AER variable on uninvested cash up to £20,000 in the Boosted Account only
- Average Invested Value of £2,000+ required in each calendar month of the Boost Period to qualify for that month's boosted rate
- Market value drops don't disqualify you; voluntary sales or withdrawals that drop your average below £2,000 do
- Cash balances above £20,000 in the Boosted Account, and any cash in other Eligible Accounts, earn 3.75% AER (Standard Rate) up to the £100,000 cross-account interest cap
- Interest credited monthly
- Boosted rate is variable - IG can change it at any time
- Cannot combine with any other concurrent IG promotion (e.g. JUNECASH500 cashback or TRANSFER5000 transfer offer)
The Bottom Line
Useful if you want to park a meaningful cash balance with IG alongside investing. The boost is 1.25% above the 3.75% standard rate, capped at £20,000 of uninvested cash for 12 months — so the most you can earn from the boost itself is around £250 over the year. You need to invest £2,000+ in June AND maintain a £2,000+ average invested value each month to keep the boost. Note: you can only use ONE concurrent IG promotion — picking this means you can't also take the £50–£500 Cashback Offer or the up-to-£5,000 Transfer Offer. Best for people who'd genuinely hold £10k+ uninvested cash at IG for the year.
Frequently Asked Questions
The boost is 1.25% above IG's standard 3.75% AER, applied to up to £20,000 of uninvested cash. The maximum extra interest from the boost alone over the 12 months is around £250 (1.25% x £20,000). You also earn the standard 3.75% on top, which would bring total interest on a full £20k balance to roughly £1,000 over the year - but that depends on holding the cash balance throughout.
No. IG explicitly prohibits stacking concurrent promotions. You apply one promo code per account, so you pick one: JUNEINTEREST5 (this 5% boost), JUNECASH500 (£50-£500 cashback), or TRANSFER5000 (transfer cashback up to £5,000).
Per clause 8, a drop caused purely by market movements doesn't disqualify you - provided your Net Investment during June was £2,000+. But if you sell or withdraw and your Average Invested Value falls below £2,000 in a given month, you lose the boost for that month (you'd get the 3.75% standard rate instead). You can qualify again in later months if you top up.
No - the boost applies only to UNINVESTED cash sitting in your account. Invested money (shares, ETFs etc.) isn't affected by this offer.
Cash above £20,000 in your Boosted Account earns the standard 3.75% AER. Cash in other IG accounts also earns 3.75%. There's an overall £100,000 cap on cash that earns any interest across all your IG accounts.
No - it's a variable rate. IG reserves the right to change it at any point and without prior notice (clause 11). The standard rate of 3.75% is also variable.
You will be directed to IG Invest's website. T&Cs apply. Your capital is at risk.
This page is for information purposes only and does not constitute financial advice. Offers are subject to availability and may be withdrawn at any time. Always verify current terms directly with IG Invest. The value of your investments can go down as well as up.