Wealthfront vs Betterment vs Robinhood Gold: The Best Brokerage Cash Account for Idle Money

Cash sitting in a checking account earning nothing is a quiet tax you pay for convenience. Brokerage cash sweeps fix that by parking idle money above 3% while keeping it a same-day move away from your investments. The three most-used options are separated by about a tenth of a percentage point on headline APY, so the real decision comes down to fees, coverage, and how much cash you actually need to protect.

The headline rates are closer than they look

Wealthfront Cash Account pays a 3.55% base APY as of September 18, 2026, uncapped, meaning the rate applies to your whole balance rather than a first slice. New clients also get a 0.65% boost for three months on up to $150,000. Betterment Cash Reserve sits just under at a 3.50% base as of September 21, 2026, but it adds a 0.75% new-customer boost on up to $1M through February 15, 2027 that lifts a new account to 4.25%. Robinhood Gold Cash Sweep tops the list at 3.6% APY on eligible brokerage cash, with one condition: you have to be a Robinhood Gold subscriber at $5 a month.

On a $10,000 balance, the spread between the highest and lowest base rate here (3.60% versus 3.50%) is about $10 a year before any fee. That is small enough that the tiebreakers, coverage and cost, matter more than the rate itself for most savers.

The subscription math on Robinhood Gold

Robinhood's 3.60% is the highest number in the table, but Gold costs $5 a month, or $60 a year. Its edge over Wealthfront's 3.55% is 0.05 of a percentage point. To earn an extra $60 from that 0.05-point gap, you need roughly $120,000 sitting in cash (0.05% of $120,000 is $60). Below that balance, the subscription eats the rate advantage and you would net more at Wealthfront.

The math flips if you already pay for Gold. If you keep it for margin, bigger instant deposits, or the deposit match, the 3.60% sweep is effectively a free upgrade on cash you were holding anyway. In that case Robinhood is the highest rate with no marginal cost.

FDIC coverage and access

All three route your cash to partner banks, which is how a brokerage account extends FDIC protection past the standard $250,000 per-bank limit. Wealthfront advertises up to $8M in FDIC insurance eligibility through program banks, tied for the highest figure of the three, and a real differentiator if you park a large balance or run a business account. Betterment offers up to $8M for joint accounts and $4M for individual accounts, which clears the $250,000 threshold comfortably for most households. Robinhood's cash sweep runs through program banks as well, though its headline pitch centers on the 3.60% rate rather than a coverage ceiling.

Access matters too. Wealthfront highlights instant withdrawals, so the cash is not stranded for days when you actually need it. All three keep the money liquid rather than locking it up the way a CD would.

Bottom line

For most people, Wealthfront is the default winner: 3.55% uncapped, up to $8M in FDIC coverage, instant withdrawals, and no subscription to buy. If you are opening a new account and want the highest rate today, Betterment's 0.75% boost pushes a new balance to 4.25% through February 15, 2027, which beats everyone while it lasts. Robinhood Gold's 3.60% only wins on rate if you already pay for Gold, or if you hold north of $120,000 in cash where the $60 fee finally pays for itself.

FAQ

Which account has the highest APY?
Robinhood Gold Cash Sweep at 3.60% as of September 2026, but it requires a $5-a-month Gold subscription. Wealthfront's 3.55% base is the highest rate with no subscription attached.

Is cash in a brokerage sweep FDIC insured?
Yes. These accounts move your balance to partner banks, extending FDIC protection well beyond $250,000. Wealthfront states up to $8M in coverage, and Betterment up to $8M for joint accounts ($4M individual).

How much do I need for Robinhood Gold to be worth it?
About $120,000 in cash. That is the balance where the 0.05-point rate edge over Wealthfront covers the $60 annual Gold fee. Below it, Wealthfront nets more, unless you already pay for Gold for other reasons.

Does Betterment's higher rate last?
The 0.75% lift is a new-customer boost on up to $1M through February 15, 2027, so treat 4.25% as a promotional rate. After it ends, the account reverts toward the 3.50% base.

Can I get my money out quickly?
Wealthfront advertises instant withdrawals on its cash account, and all three keep cash liquid rather than locking it up like a CD.