Mercury vs Brex: Three Users Reverse the Paid-Plan Price Edge

Glamdring Research’s September 2026 price model puts one Brex Premium user at $12 a month against Mercury Plus’s displayed $29.90, but three Premium users at $36—above Plus. At 25 users, Brex Premium reaches $300, just above Mercury Pro’s displayed $299. The reversal is in the listed plan charge, not in the value of the features each plan provides.

Mercury is the more natural choice when an operating account, domestic payments and invoicing are the main needs. Brex deserves closer attention when employee cards, reimbursements and layered expense approvals drive the purchase. Both have free starting plans, so paying for either upgrade only makes sense when its particular controls or workflows are needed.

What five team sizes cost

The Brex pricing schedule lists Essentials at $0 per user per month, Premium at $12 per user per month and Enterprise on a custom quote. Premium therefore rises with the number of users on the plan. Essentials includes useful spending tools, so the paid-seat calculation should not be mistaken for the cost of every Brex account.

The Mercury pricing page displays its base plan at $0, Plus at $29.90 per month and Pro at $299 per month, with no per-user price shown. It also places an annual-pricing option beside those figures, while its FAQ gives $35 per month as the starting price for paid plans. Those two Plus figures are not reconciled on the page; the $29.90 amount below is a displayed comparison input, not a promise of that price on monthly billing. Reimbursing out-of-pocket expenses for more than five active users in a month also requires a paid tier.

Using the displayed Mercury amounts and multiplying Brex Premium’s $12 rate by users gives these monthly plan-charge comparisons. The figures exclude transaction fees, taxes and any negotiated terms:

1 user: Brex Premium $12; Mercury Plus $29.90; Mercury Pro $299.
3 users: Brex Premium $36; Mercury Plus $29.90; Mercury Pro $299.
10 users: Brex Premium $120; Mercury Plus $29.90; Mercury Pro $299.
25 users: Brex Premium $300; Mercury Plus $29.90; Mercury Pro $299.
50 users: Brex Premium $600; Mercury Plus $29.90; Mercury Pro $299.

At three users, the $36 Brex total also exceeds Mercury’s separate $35 starting figure. At 25, the difference between Brex Premium and the displayed Pro price is only $1, making the billing terms especially relevant. Neither crossover means that the paid tiers are interchangeable: the expense-policy depth in Brex Premium and the invoicing and accounting additions in Mercury’s paid tiers answer different needs.

Banking features and spending controls

Mercury’s base business account has no required monthly account fee or minimum balance, and domestic ACH payments, wires and checks have no Mercury fee. It also includes bill pay, invoices, employee cards with limits, receipt matching and accounting feeds. A small team focused on collecting revenue and paying domestic bills can use much of that workflow without a subscription.

Plus adds recurring invoices, invoices paid by ACH debit and unlimited 1099 filings. Its ACH-debit invoice payments carry a $1 per-transaction charge. Pro adds a relationship manager and NetSuite categorizations and removes that Plus charge for ACH-debit invoice payments. These upgrades are most directly tied to finance administration and customer billing.

Brex Essentials already includes corporate cards, bill pay, reimbursements, accounting integrations, local-currency wires and travel booking. Premium adds multiple customizable expense policies, dynamic review and approval chains, live budgets and broader multi-entity support. A team whose difficulty is routing employee spending through different rules may find those additions more relevant than Mercury Plus’s invoicing features, even when Premium has the higher listed plan charge.

Transaction costs beyond the subscription

Mercury’s published charges make international activity a separate part of the comparison. Non-USD international wires carry a 1% currency-exchange fee, and non-USD card transactions carry a 3% currency-exchange fee. Standard USD international wires are free from Mercury, while an optional $15 processing choice makes it more likely that the recipient receives the full amount after intermediary fees. A business sending many foreign-currency payments could spend more on these charges than on its plan.

Brex includes local-currency wires among its plan features, but its plan price alone does not establish the foreign-exchange cost of a particular payment. The pricing page notes that some products have associated fees without giving an itemized transaction comparison beside the seat rates. For a mostly domestic operation, plan scope may dominate the decision; for an international payer, the currencies, payment routes and applicable fees materially affect the total.

Where the cash sits

Mercury’s deposit-insurance explanation identifies Choice Financial Group and Column N.A. as its partner banks and describes conditional FDIC eligibility for checking and savings deposits through their sweep networks. Mercury itself is a fintech company, not an FDIC-insured bank. Mercury Treasury assets are not bank deposits and are not FDIC-insured; the protection described for brokerage failure is different from deposit insurance and does not remove investment risk.

The Brex business-account guide identifies Checking as an account provided by Column N.A., while Treasury and Vault are cash-management services provided by Brex Treasury LLC. Treasury invests funds in a government money market fund, and those funds are not FDIC-insured. Vault funds can become eligible for FDIC insurance at program banks, subject to conditions, but are not FDIC-insured before they arrive there. A balance held in checking therefore has a different structure from one allocated to Treasury or awaiting a Vault sweep.

Which plan earns its price

For a startup mainly receiving customer payments and making domestic transfers, Mercury’s free banking and invoicing features cover the central work; Plus is more compelling when recurring billing, ACH-debit invoicing or expanded reimbursements are needed. For a business coordinating many cardholders across policies and entities, Brex Essentials supplies a substantial free workflow, while Premium adds the approval depth that creates its per-user charge.

The practical dividing line is the work the upgrade must do. Three Premium seats reverse the initial paid-plan price comparison with Mercury Plus, yet the cheaper displayed subscription may still be the wrong purchase if it does not provide the spending controls or billing tools the team needs.