Interactive Brokers (IBKR) is one of the most widely used investment platforms among UAE expats. Low commissions, global market access, and the ability to hold multi-currency accounts make it a popular choice for people managing savings across currencies.
IBKR also pays interest on uninvested cash. But the details matter — and most UAE residents with IBKR accounts aren't earning what they think they are.
How IBKR interest works
IBKR pays interest on uninvested cash in your account, but with important conditions:
Minimum balance: IBKR only pays interest on the portion of your USD cash balance above $10,000. If you hold $9,500, you earn nothing. If you hold $15,000, you only earn on $5,000.
Rate: Currently around 4.33% on the eligible portion (USD, above the threshold). This rate tracks the Federal Reserve's target rate minus a spread that IBKR keeps as margin.
Account type matters: IBKR Pro accounts get a better rate than IBKR Lite. Pro requires a minimum of $100/quarter in commissions or $10/month fee if you don't trade enough.
Cash sweeps: Cash above certain thresholds may be swept to money market funds. The mechanics depend on your account settings.
The effective rate is usually lower than it looks
If you hold $20,000 in IBKR:
- First $10,000: 0%
- Next $10,000: ~4.33%
- Effective rate on total balance: ~2.17%
If you hold $50,000:
- First $10,000: 0%
- Next $40,000: ~4.33%
- Effective rate: ~3.46%
The larger your balance, the closer the effective rate gets to the headline rate. At $100,000+, the impact of the $10,000 floor becomes minimal. At $20,000-$30,000 — a common holding range for UAE expats who keep spare cash alongside investments — the effective rate is meaningfully lower than advertised.
The activity fee situation
If you don't trade at least $10 of commissions per month on IBKR Pro, they charge a $10 monthly fee. For people who use IBKR primarily for the cash interest (rather than active investing), this fee can eat materially into the returns.
On a $30,000 balance earning an effective 3.5%:
- Annual interest earned: ~$1,050
- Annual inactivity fees (if not trading): $120
- Net: ~$930 effective return
What Vault offers instead
Vault is a separate product — not an investment account, not a brokerage. It's specifically designed for idle savings.
| Feature | IBKR | Vault |
|---|---|---|
| Headline rate (USD) | ~4.33% | ~5.4% (variable) |
| Minimum for interest | $10,000 | None |
| Effective rate at $20K | ~2.17% | ~5.4% |
| Effective rate at $50K | ~3.46% | ~5.4% |
| Monthly activity fee | $10 if <$10 commissions | None |
| Investment account required | Yes | No |
| Purpose | Investing + idle cash | Savings only |
The headline rate comparison (~4.33% vs ~5.4%) understates the actual gap for most users. Because Vault has no minimum balance threshold and no fee structure, the effective rate is the headline rate regardless of how much you hold.
For pure savings intent — money you're not actively investing — Vault is a different product category designed specifically for that use case.
When IBKR makes sense for cash anyway
IBKR interest does make sense in some scenarios:
- You're already holding cash in IBKR while deciding where to invest it — you'll earn something while it sits there
- Your balance is large enough ($100,000+) that the floor effect is minimal
- You're actively trading and meet the commission minimum, so the inactivity fee doesn't apply
- You want everything in one account for simplicity
The argument isn't that IBKR cash interest is bad. It's that it's designed as a feature of a brokerage account, not a savings product — and the conditions reflect that.
The practical split
Many UAE expats end up with something like this:
- IBKR for investment capital — global equities, ETFs, currency holdings
- A dedicated savings product for the cash reserve, emergency fund, or money not deployed in markets
For the savings layer, the options in the UAE without conditions are limited. Vault is currently the highest-rate flexible option on that list.
Join the waitlist at vlt.money
Vault earnings are fees paid by institutional borrowers in vetted lending markets — not guaranteed returns. Rates are variable. Vault is in the process of obtaining ADGM regulatory approval.
