Both Mercury and Relay integrate cleanly with common bookkeeping software because both platforms are built specifically for modern, digital-first businesses. Mercury targets venture-backed startups needing complex treasury management, while Relay focuses heavily on cash flow visibility for small businesses. Before you can evaluate software integrations, you must formally establish your LLC. A service like ZenBusiness handles this formation paperwork, ensuring your entity is legally prepared to open an account with either fintech provider.

Integrating your business checking account with your accounting software reduces data entry errors and automates reconciliation. While legacy traditional banks often rely on clunky manual exports, modern financial technology platforms like Mercury and Relay prioritize seamless API connections. These fintechs, commonly known as nonbanks, connect directly to tools like QuickBooks and Xero, saving founders hours of administrative work each month.

Choosing between Mercury and Relay comes down to understanding which type of business each platform was built to serve. However, before you can connect a bank feed to your ledger, you must have a legally established business entity. Operating out of a personal account to track business expenses is a severe operational error that threatens both your liability and your tax compliance.

The requirement for financial separation Opening a dedicated business checking account is a fundamental legal requirement for protecting your personal assets. The U.S. Small Business Administration warns that failing to separate means you risk forfeiting the legal protections that entity structures offer. The corporate veil that protects your personal savings from business debts requires strict financial boundaries. The SBA states clearly that to keep personal funds and business funds completely separate you must have two different bank accounts.

This separation is just as critical for accurate tax reporting. The Internal Revenue Service expects a clean paper trail for all your business activity. IRS Publication 583 advises that one of the first things you should do when you start a business is open a business checking account. The IRS dictates that you should keep your business account separate from your personal checking account from the very beginning.

To open an account, a bank must verify that your business exists. What a bank actually asks for varies by bank. Bank of America requires the business name and address, the state of formation, the EIN or SSN, and the date the business was established. It also requires personal details for everyone on the application, including the Social Security Number and date of birth for anyone with at least 25 percent or more ownership.

Handling this formation paperwork is often a bottleneck for eager founders. ZenBusiness manages the state entity filings and secures the Employer Identification Number from the IRS. By completing the formation steps correctly, it ensures you have the exact documents a banker will demand. Customers who form their entity with the platform also receive a free accounting consultation. You can view the ZenBusiness accounting features to set up your bookkeeping structure simultaneously with your new bank account.

Deposit insurance and fintech risks When evaluating fintech platforms like Mercury and Relay, you must understand their specific regulatory structure. Neither company is a bank. They provide a software interface and partner with traditional, chartered banks to hold your deposits.

The FDIC provides deposit insurance that protects depositors when a traditional bank fails. The deposit accounts of a corporation, partnership, or unincorporated association are insured for up to $250,000. This is an aggregate limit per institution. All accounts held by the same entity at one insured bank are combined. This means separate accounts for different divisions or purposes do not get separate coverage.

Because Mercury and Relay are not banks, they carry a different risk profile. The FDIC explicitly states that nonbank companies themselves are never FDIC-insured. Funds you send to a nonbank company are not eligible for FDIC insurance until the company deposits them in an FDIC-insured bank and after other conditions are met.

More importantly, FDIC deposit insurance does not protect against the insolvency or bankruptcy of a nonbank company. If the fintech platform itself fails, recovery runs through an insolvency or bankruptcy proceeding. The FDIC warns this process may take some time, which could temporarily freeze your business operations. You must weigh the superior software integrations of a fintech against the structural risk of trusting a nonbank entity.

Comparing Mercury and Relay Both Mercury and Relay offer digital-first banking with strong software connectivity, but their pricing tiers reflect their different target audiences. These prices are verified as of October 6, 2026.

Mercury Mercury is built for startups, emphasizing API access and treasury management tools that appeal to venture-backed companies. The base checking account costs $0 per month. The Plus tier costs $29.90 per month, and the Pro tier is $299 per month.

Relay Relay is designed for small businesses that need deep cash flow visibility and team spending limits. The Starter tier costs $0 per month. The Grow tier is $30 per month, and the Scale tier is $90 per month. Relay allows founders to open multiple checking accounts to segregate funds and issue dedicated physical or virtual debit cards to employees.

Other options for software integration If neither Mercury nor Relay fits your needs, several other modern platforms prioritize clean integrations with bookkeeping software. We list these providers alphabetically for comparison.

American Express Business Checking American Express provides a digital checking account with no monthly fee and no minimum balance requirement. It earns 1.00 percent APY on balances up to $500,000.

Axos Bank Axos Bank offers a Basic Business Checking account that costs $0 per month, with no minimum balance and no maintenance fee. Its Business Interest Checking account costs $10 per month, which is waived with a $5,000 minimum average daily balance, and takes a $100 opening deposit.

Bank of America Bank of America is a traditional institution offering massive physical reach. The Business Advantage Fundamentals Banking account costs $0 or $16 per month. Fundamentals has no monthly fee for the first 12 months, after which the fee is waived by a $5,000 combined average monthly balance, $500 in new net qualified debit card purchases, or Preferred Rewards for Business membership. The Business Advantage Relationship Banking account costs $0 or $29.95 per month.

Bluevine Bluevine focuses on yield for active businesses. The Standard tier costs $0 per month. The Plus tier is $30 per month, and the Premier tier is $95 per month. The Plus and Premier fees are waivable. Bluevine yields 1.3 percent APY on Standard subject to a monthly activity goal, 1.75 percent on Plus, and 3.0 percent on Premier.

Chase Chase offers comprehensive traditional banking services. Business Complete Banking costs $15 per month. Performance Business Checking is $40 per month, and Platinum Business Checking is $95 per month. Each fee is waivable based on stated balance or activity conditions.

Novo Novo is a digital platform tailored for independent contractors and lean small businesses. Novo charges a $0 per month fee, with no monthly fee to maintain the account. The platform emphasizes deep integrations with popular invoicing tools.

U.S. Bank U.S. Bank offers traditional checking with varied fee waiver paths. Business Essentials costs $0 per month. Gold costs $20 or $0 per month. Platinum is $30 or $0 per month, and Premium is $34 per month. The Gold fee is waived by a merchant account, a $10,000 average collected balance, or larger combined balances. The Platinum fee is waived by a merchant account or a $25,000 average collected balance.

Sources

This article provides general information and is not legal, tax or accounting advice. Requirements vary and change over time.