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By SoloFinanceStack Team
Last reviewed: May 2026
Segment Guide

The short answer

Mercury is the best business bank for most solo consultants. Its integrations with FreshBooks, QuickBooks, and Stripe are the strongest of any free business bank — which matters when your revenue flows through invoices and your books need to close cleanly every month. Zero fees, a savings account for idle cash, and an interface that doesn't require a finance background to use.

Relay is the better choice if you want automatic tax bucketing and work with a bookkeeper who needs their own account access. Its sub-account system — up to 20 named accounts, each with a debit card — is uniquely useful for consultants managing irregular, lumpy income who want to separate taxes, reserves, and operating cash without manual transfers.

Both are free. Both are built for one-person businesses. The decision comes down to what matters most to you: integration depth (Mercury) or cash management structure (Relay).

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How consulting income changes what you need from a bank

Consulting revenue is lumpy — big invoices, followed by gaps. You need: automatic tax bucketing so quarterly estimates don't surprise you · Clean integration with FreshBooks or QuickBooks so invoices reconcile without manual work · A savings account for the operating reserve that covers slow months · The ability to pay contractors if you subcontract work

Mercury — best for most consultants

Mercury
Best overall for consultants billing through FreshBooks or Stripe
Monthly Fee $0
Minimum Balance $0
Free Wires Yes (domestic, limit/mo)
FDIC Yes (via partner banks)
QuickBooks + Xero integrations: Connect once and invoices reconcile automatically. Client payments hitting your bank appear in your accounting software without manual entry — saves 30+ minutes per week at scale. Note: FreshBooks connects via Zapier, not a native integration.
Stripe integration: If clients pay via Stripe, Mercury and Stripe connect natively. Revenue flows cleanly without manual reconciliation between platforms.
Free domestic wires: Consulting clients sometimes pay via wire. Mercury includes free domestic wires up to a monthly limit — Relay charges $10 per wire on the Pro plan.
Savings account with yield: Park your operating reserve and quarterly tax allocation in Mercury savings. Your 60-day reserve earns while it waits.
Scales with you: Mercury's team features, virtual cards, and credit products (for qualifying accounts) mean you won't outgrow it as your practice grows.
Best for: Consultants billing through FreshBooks, invoicing via Stripe, or needing occasional wire transfers — especially those with accounting software already in place
Open Mercury Account →

Relay — best for cash management and bookkeeper collaboration

Relay
Best for Profit First consultants and those with an active bookkeeper
Monthly Fee $0 (Pro: $30/mo)
Sub-accounts Up to 20
Auto transfers Yes — percentage-based
FDIC Yes (via Thread Bank)
Automatic tax bucketing: Set a rule that moves 25–30% of every deposit to a Taxes sub-account automatically. Quarterly estimates stop being a surprise. This one feature is worth the bank switch for many consultants.
Bookkeeper access: Invite your CPA or bookkeeper with their own login. They can reconcile transactions, generate reports, and close your books without emailing you for account access. Standard Mercury doesn't offer this on the free tier.
Operating reserve sub-account: Create a named Reserve account and automate a monthly transfer into it. A 60-day operating reserve is the single best financial decision a solo consultant can make — Relay makes building it automatic.
Profit First out of the box: The sub-account structure is designed for this method — Operating, Profit, Owner's Pay, Taxes, Reserve. Set it up once, run it forever.
Best for: Consultants following Profit First, working with a bookkeeper, or wanting automatic tax separation on irregular income
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Side-by-side for consultants

FeatureMercuryRelay
Monthly fee$0$0 (Pro $30/mo)
FreshBooks integration✓ Native✓ (less seamless)
QuickBooks integration✓ Native✓
Stripe integration✓ NativeLimited
Sub-accounts / tax bucketingLimited✓ Up to 20
Automatic % transfers✗✓
Bookkeeper access (free)✗✓
Free domestic wires✓ (limit/mo)✗ (Pro only, $10/wire)
Savings with yield✓✓
Credit products✓ (qualifying)✗

What consultants specifically need from banking

Quarterly tax management. Consulting income has no withholding. Every payment you receive is pre-tax. The consultants who get blindsided by a $15,000 April tax bill are the ones who didn't separate taxes from operating cash from day one. Whether you use Mercury's savings account or Relay's sub-accounts, the mechanics are the same: move 25–30% of every deposit immediately.

Invoice reconciliation. You're billing clients via FreshBooks or QuickBooks. Every payment should appear in your accounting software without manual entry. Mercury's integrations make this automatic. This matters more than almost any other banking feature for a consulting practice.

Operating reserve. A 60-day operating reserve is the difference between a slow quarter being a minor inconvenience and a financial emergency. Build it before you need it. Both Mercury and Relay offer savings accounts for this purpose.

Clean books for the CPA. At year-end, your CPA needs to see business income and expenses separated cleanly from personal finances. A dedicated business bank account that connects to accounting software makes this a 15-minute monthly close instead of a 3-day January reconstruction.

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For the full consultant financial OS

Banking is layer one. See the complete consultant financial stack — including accounting, business credit, and the right card — at the Consultant Financial Stack page →