Mercury vs Brex vs Relay: Best Business Bank Account for Consulting Firms & Solo Consultants
As a consultant, coach, or advisor, your business bank account is where client payments land and your operational costs are paid. It's crucial for separating business from personal money and setting aside funds for taxes. Mercury, Brex Cash, and Relay are three top fintech options. They offer different benefits for managing your consulting revenue, team payments, and software subscriptions, making them ideal for anyone selling their expertise by the hour or project.
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The Quick Answer
For most solo consultants, life coaches, or new advisors, Mercury is the top pick: easy to use, no fees, and a strong API for connecting to your accounting software. Relay works best if you manage a small team of contractors or virtual assistants and need separate accounts for different client projects, taxes, or marketing budgets. Brex Cash makes sense if your consulting firm already uses Brex cards to manage software subscriptions, travel, or client entertainment expenses, offering a unified spend dashboard.
Side-by-Side Breakdown
Mercury: No monthly fees. No minimum balance. Your funds are FDIC insured up to $5M through partner banks. They offer a 'Treasury' product, allowing you to earn yield on client retainer funds or your tax savings. Its strong API is great for integrating with popular consulting tools like QuickBooks, FreshBooks, or client invoicing platforms.
Relay: No monthly fees (Relay Pro at $30/month adds more perks). You can open up to 20 separate checking accounts and get 50 debit cards per business. This is perfect for consultants who want to allocate money for specific client projects, owner's draws, contractor payments, marketing campaigns, or even a dedicated tax savings account. It offers robust team permission controls for your admin or virtual assistant.
Brex Cash: Free if you use a Brex corporate card. FDIC insured up to $6M. It can offer a high-yield on your operating cash balance. This platform is tightly integrated with Brex's expense management, which is useful if your consulting firm has significant recurring software subscriptions (e.g., CRM, project management tools), travel expenses for client visits, or large advertising spends. It doesn't offer a standalone checking account without the card product.
When to Choose Mercury
Choose Mercury if you are a solo consultant, a new life coach LLC, or an independent advisor who needs a straightforward, no-fee business account. It's ideal for easily separating personal and business finances on day one. If you want a solid API for custom integrations with your client management system or accounting software, or for automating financial reporting, Mercury fits well. You can use its 'Treasury' option to park your retained earnings, tax savings, or future investment funds (like for a new certification or marketing course). Mercury is also one of the quickest to open; many consultants get approved within 24-48 hours without needing to visit a branch.
When to Choose Relay
Relay is your go-to if you run a small consulting firm with multiple contractors, virtual assistants, or junior advisors and need granular role-based payment controls. It's excellent if you want to allocate client payments into separate accounts: for example, one account for payroll for your VAs, another for quarterly taxes, a third for marketing expenses, a fourth for owner's pay, and individual accounts for large client project budgets. Relay's multi-account structure closely mirrors the 'Profit First' methodology, making it easier for consultants to implement a disciplined financial strategy.
When to Choose Brex Cash
Consider Brex Cash if your consulting practice already uses Brex for its corporate card to manage recurring software subscriptions (e.g., Salesforce, ClickUp, HubSpot), client entertainment, or travel expenses for client meetings. It's a great choice if you want a single platform for all your spend management, client expense reimbursements, and cash flow. Plus, you can earn yield on your operating balance without needing to transfer money to a separate treasury account, and see all your card spend and bank balances on one integrated dashboard.
The Verdict
Start with Mercury unless you have a specific need that it doesn't meet. It has the cleanest interface, no hidden fees, and broad support for solo consultants and smaller firms. Upgrade to Relay if you find yourself needing to segment your client payments, expenses, and tax savings into multiple dedicated accounts, or if you need robust team payment controls for your growing consulting practice. Consider Brex Cash if your firm is heavily invested in the Brex corporate card ecosystem for its operational expenses and wants a completely unified financial management platform.
How to Get Started
Mercury: Apply at mercury.com. You'll need your EIN, business formation documents (like your LLC operating agreement), and a personal ID. Approval is typically very quick, often same-day to 48 hours.
Relay: Apply at relayfi.com. Before you open, think about how you want to structure your accounts – deciding on your sub-account categories upfront (e.g., 'Taxes', 'Owner's Pay', 'Client Project A', 'Marketing') will save you time reorganizing later.
Brex Cash: Open this through the Brex onboarding process when you apply for their corporate card. Remember, you cannot open Brex Cash as a standalone product; it requires the associated corporate card.
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FREQUENTLY ASKED QUESTIONS
Are Mercury and Relay real banks?
No. Both are financial technology companies that partner with FDIC-insured banks to hold deposits. Your deposits are FDIC insured, but Mercury and Relay themselves are not chartered banks.
Can I use Mercury or Relay for payroll?
Yes — both support ACH transfers needed for payroll. But most businesses use a dedicated payroll platform (Gusto, Rippling, ADP) and simply connect it to their Mercury or Relay account for the ACH pull.
Which account earns the most interest on cash?
Mercury Treasury earns a competitive yield on balances over $500K. For smaller balances, Brex Cash currently offers the highest yield on operating balances among the three. Rates change frequently, so compare current rates at account opening.