Best Business Checking for Law Firms
2026: IOLTA Trust Accounts
Operating account plus IOLTA trust account. State-bar-approved banks, ABA Model Rule 1.15 compliance, three-way reconciliation, and the structural separation that protects the bar license.
The two-account structure every law firm needs
Every law firm in the US must, at minimum, maintain two distinct bank accounts: the operating account (where the firm's earned fees, accounts payable, payroll, and rent flow) and the IOLTA trust account (where client funds held in trust are kept until earned). The two pools must be physically separate at the bank level, not merely accounted for separately. This is the core requirement of ABA Model Rule of Professional Conduct 1.15, adopted in some form by every US state.
The IOLTA program (Interest on Lawyer Trust Accounts) is the mechanism every state has adopted to pool short-term client funds into interest-bearing accounts, with the interest payable to a state bar foundation that funds civil legal aid for low-income clients. The lawyer is the fiduciary; the funds belong to clients; the interest skips the firm and goes to the foundation. Established in Florida in 1981 and adopted nationally over the following decade, IOLTA is now mandatory in every US state with a roughly uniform structure (some states allow opt-out for newly admitted lawyers; most do not).
The bank-account decision for a law firm is therefore two decisions. The operating account can be at any bank or fintech that meets the firm's operational needs. The IOLTA must be at a bank that has enrolled in the firm's state IOLTA program and that has set up the interest-remittance infrastructure with the state foundation. State bar lists of IOLTA-eligible banks are usually published on the bar's website.
IOLTA-eligible banks: the practical universe
The IOLTA-eligible bank list varies by state and is curated by the state's IOLTA program (typically a non-profit affiliated with the state bar). Three patterns are universal:
- National banks are always on the list. Chase, Bank of America, Wells Fargo, US Bank, PNC, Citi, Truist, and similar are enrolled in every state's IOLTA program. The lawyer or firm administrator opens an IOLTA at any local branch.
- Regional and community banks are usually on the list. Most regional banks (M&T, Fifth Third, KeyBank, Huntington, etc.) and many community banks enrol in their home state's IOLTA program. A few smaller community banks do not, and the state bar list will reflect this.
- Fintechs are generally NOT on the list. Mercury, BlueVine, Relay, Brex, Novo, Bluevine, Lili, and similar fintech business accounts have not enrolled in state IOLTA programs as of 2026. The state bar's eligibility requirement typically requires a direct bank-to-foundation interest-remittance arrangement, which fintechs (which route through partner banks) have not structured. This is the single biggest constraint on a law firm choosing a fintech for primary banking: the IOLTA must be elsewhere.
A common pattern: the firm runs its operating account at Chase, BofA, or a fintech (Relay is popular with mid-size firms because of QuickBooks integration), and runs the IOLTA at the same Chase or BofA. Some firms run the operating account at a fintech for the QBO/Xero integration and the IOLTA separately at a local bank that the firm has an existing relationship with.
What goes in the IOLTA and what does not
Funds belonging to clients (not the firm) go in the IOLTA. Examples:
- Unearned retainers (the client paid a $5,000 retainer, no work has been billed against it yet)
- Settlement proceeds received on behalf of a client, awaiting distribution
- Filing fees advanced by the client before the case is filed
- Estate or trust corpus held temporarily before distribution
- Funds received from a third party on behalf of a client (insurance proceeds, opposing party settlement)
Funds belonging to the firm do NOT go in the IOLTA. Examples:
- Earned fees (when work is billed and the retainer is drawn, the earned portion moves from IOLTA to operating)
- Firm operating capital, payroll, rent, vendor payments
- Flat-fee payments that are considered earned at receipt (jurisdiction-dependent; many states require even flat-fee payments to start in IOLTA and move out as earned)
- Firm general counsel reserves, partner distributions, profit pool
The firm-funds question that trips up most lawyers: bank service charges on the IOLTA. The firm cannot pay bank fees out of IOLTA principal (that would be commingling). The fix is either to ask the bank to bill IOLTA fees to a linked operating account (which most IOLTA-program banks do automatically) or to deposit a small amount of firm money in the IOLTA explicitly to cover service charges, which is permitted under Model Rule 1.15(b). Verify your state's specific rule.
Trust accounting software and the bank feed
For any firm beyond a single solo lawyer with a few clients, trust accounting software is essential. The category leaders for small firms are Clio, MyCase, PracticePanther, and LeanLaw (which is the QuickBooks-integrated trust accounting layer). All four:
- Maintain a per-client ledger of trust balances inside the pooled IOLTA
- Connect to the bank feed via Plaid or direct bank API to reconcile to the actual IOLTA balance
- Produce the three-way reconciliation report (bank balance = client ledger total = trust general ledger)
- Flag attempted overdrafts of individual client sub-balances (you cannot disburse $5,000 to client A if client A only has $3,000 in trust, even if the IOLTA as a whole has $50,000)
- Generate the audit-ready trust history that the state bar may request
The bank-feed quality matters here. Chase, BofA, Wells Fargo, US Bank, PNC, and the other national banks are well-supported by every trust accounting platform via Plaid or direct feed. Smaller community banks sometimes have lower feed quality, requiring manual transaction entry. Verify the bank feed is supported by the trust accounting software the firm uses before opening the IOLTA.
Operating account: what makes a law firm different
On the operating side, a law firm's banking needs are similar to any professional services firm with a few wrinkles:
- Wire transfers are routine. Closing real estate, settling personal injury cases, disbursing trust funds. A bank or fintech with low wire fees materially affects monthly cost. Relay at $10 per wire is the cheapest in the fintech category; Mercury at $0 is competitive but capped at lower outbound volumes; traditional banks charge $25 to $40 per wire.
- Filing-fee disbursements are frequent. Filed court fees, filing fees for corporate formations, recording fees. These are typically reimbursed by the client. A clean transaction history that distinguishes firm expenses from reimbursable client costs is essential for accurate billing.
- Per-matter cost tracking is preferred. Practice-management platforms (Clio, MyCase) tag transactions to matters. Bank feed quality and consistent transaction descriptions matter for downstream cost allocation.
- Payroll is the largest single expense. Most firms run weekly or bi-weekly payroll. A dedicated payroll sub-account or second operating account is standard.
For firms running Clio or LeanLaw with QuickBooks Online, Relay's direct-feed QBO integration is materially better than the Plaid-via-fintech setup. For firms running on the trust software's own ledger without QBO, the bank choice is less constrained.
The recommended firm configuration
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Frequently Asked Questions
What is the best business checking account for a law firm?
Law firms need two distinct account types: an operating account (where the firm's earned fees, expenses, and payroll flow) and an IOLTA trust account (where client funds are held in trust before being earned). For the operating account, Chase Business Complete, BofA Business Advantage Fundamentals, or a Relay-style fintech all work. For the IOLTA, the firm must use a bank approved by the state bar's IOLTA program, which limits the options to traditional banks (and a handful of regional banks) that have set up the IOLTA infrastructure. Most state bars publish a list of IOLTA-eligible banks; check that list before choosing.
What is an IOLTA account?
IOLTA (Interest on Lawyer Trust Accounts) is the program established by every US state bar that requires lawyers to hold short-term, nominal client funds in a pooled interest-bearing trust account, with the interest earned remitted to a state bar foundation that funds legal aid. The mechanism comes from ABA Model Rule of Professional Conduct 1.15, adopted in some form by every state. The lawyer is the fiduciary, the client funds are the corpus, and the interest skips the lawyer and goes directly to the IOLTA program. Misuse of an IOLTA account (commingling client funds with the firm's operating funds, using IOLTA funds for firm expenses, failure to maintain accurate records) is one of the fastest ways to lose a bar license.
Can I use a fintech like Mercury or Relay for an IOLTA?
Generally no. Most state bars require IOLTA accounts to be held at banks that have explicitly enrolled in the state bar's IOLTA program and that remit interest directly to the state's IOLTA foundation. Fintechs like Mercury, BlueVine, Relay, and Brex typically have not enrolled in state IOLTA programs (the operational and regulatory overhead is meaningful and the customer demand is small relative to the fintech's overall book). Always verify with your state bar's IOLTA program before opening any account claimed as an IOLTA. The practical answer for a law firm: operating account at any bank or fintech; IOLTA at a state-bar-approved traditional or regional bank.
Can client funds be held outside an IOLTA?
Yes, if the funds are large enough or held long enough that the interest earned would meaningfully exceed the administrative cost of a separate non-pooled trust account, the lawyer must (in most states) hold the funds in a separate interest-bearing trust account naming the client as beneficiary, with the interest payable to the client (not the IOLTA program). This is sometimes called a 'non-IOLTA trust account' or a 'special-purpose trust account'. The Model Rule 1.15 cut-off (and most state implementations) is whether the funds, when invested, would generate income for the client net of administrative costs. Short-term retainers, settlement disbursements pending distribution, and similar routine balances go in the IOLTA. Long-held custodial funds (a trust corpus, a substantial settlement awaiting tax disposition, etc.) go in a non-IOLTA trust account.
Do I need separate accounts per state or per matter?
Per state, generally yes for IOLTA: lawyers admitted in multiple states must typically maintain an IOLTA in each state where they hold client funds. Per matter, generally no: the IOLTA is pooled, and the firm maintains per-client ledger records inside the IOLTA. The ABA Model Rule 1.15(a) requirement is for 'complete records' of client property, which is achieved through ledger discipline (typically in a trust accounting software like Clio, MyCase, PracticePanther, or LeanLaw integrated with the bank feed). Reconciling the bank statement to the per-client ledger monthly is the standard discipline.
What happens if I commingle IOLTA funds with operating funds?
It depends on the jurisdiction, but commingling is one of the most-prosecuted ethical violations. Sanctions range from public reprimand (minor inadvertent commingling that is corrected promptly) to suspension and disbarment (intentional commingling, repeated commingling, or use of client funds for personal or firm purposes). The substantive rule is that client funds belong to the client until earned; firm funds belong to the firm; the two pools must be physically separate at the bank level, not merely accounted for separately. Restoring commingled funds does not erase the violation. The 'borrow then repay' pattern is treated as theft until proven otherwise. A bookkeeper or office manager who has access to the operating account should not have access to the IOLTA without lawyer oversight.
What about trust account reconciliation requirements?
Most state bars require monthly three-way reconciliation of the IOLTA: the bank balance must reconcile to the client ledger total and to the trust accounting general ledger. Trust accounting software automates this if the bank feed is connected. For a firm holding more than $25K in trust at any time, a manual spreadsheet reconciliation is feasible but error-prone; software is materially safer. Some state bars require the reconciliation to be available for inspection by the bar auditor and retain it for 5 to 7 years. Check your state's specific rule.