IG Interest on Uninvested Cash: Rates and How It Works
IG pays interest on the uninvested cash sitting in your Share Dealing Account. The rate is variable and set by IG, recently around 3.75% AER on GBP cash, and on top of that IG runs boosted promotional rates from time to time. It paid 7.5% AER early in 2026 and 5% AER in June, both aimed at new clients and both now ended.
How IG's interest on cash works
Any GBP cash you hold in your IG account but have not invested earns interest at IG's standard variable rate. IG sets that rate and can move it up or down in line with the market, and it credits the interest monthly, so it compounds while your cash sits idle. The rate applies on eligible balances up to £100,000, and IG pays no interest on cash above £300,000 in a new Share Dealing Account. Because the rate is variable, treat any headline figure as the rate on the day rather than a fixed promise, and check IG's current rate before you decide.
IG's boosted interest promotions
On top of the standard rate, IG runs boosted interest offers for new clients that pay well above its base rate for a set period. Early in 2026 it offered 7.5% AER on the first £10,000, and in June it ran a 5.00% AER boost on balances up to £75,000 for 12 months. Both were time-limited and have now closed. IG tends to launch a fresh version of these boosts through the year, so it is worth checking whether one is live before you fund an account. We keep the current deals on our IG UK offers page.
Is IG's cash interest any good?
For a brokerage paying interest on money you have not invested, IG's standard rate is competitive, and its boosted offers are strong when they run, often beating easy-access savings accounts for the period they last. Both come with a caveat: the rate is variable, and any boost reverts once its promotional window ends. So the interest is a useful bonus if you hold a cash buffer between trades, but it should not be the main reason you pick a broker. If you are chasing the best return on cash, compare it against our ranking of the best high-yield savings accounts in the UK. If you want a broker for investing, weigh the platform, the markets and the dealing costs first, and treat cash interest as a tie-breaker.
Frequently Asked Questions
How much interest does IG pay on uninvested cash?
IG pays a standard variable rate, recently around 3.75% AER, on uninvested GBP cash, on eligible balances up to £100,000. The rate is set by IG and changes over time, and cash above £300,000 in a new Share Dealing Account earns nothing.
Does IG run boosted interest offers?
Yes. IG periodically offers new clients a boosted rate well above its standard rate for a limited period. It ran 7.5% AER early in 2026 and 5.00% AER in June, both now closed. Check our IG UK offers page to see whether a boost is currently live.
Is 5% AER good for cash interest?
For interest on uninvested cash, 5% AER is a strong rate that beats most platforms and many easy-access savings accounts. When IG runs a boost at that level it is worth claiming if you hold a cash buffer, but remember the rate is variable and the boost only lasts for its promotional window before reverting to the standard rate.
How is IG's cash interest paid?
IG credits interest monthly into your account, so it compounds while your cash stays uninvested.
Does cash earn interest in an IG ISA or SIPP?
IG pays interest on eligible uninvested cash across its accounts, though its boosted promotions have typically been limited to a new Share Dealing Account for new customers. The standard rate applies per IG's terms, which you should check for your specific account.
