Banking, Custody, and Treasury

Banking Relationships: How Many and Why It Matters

A private bank — a bank or bank division that serves high-net-worth and ultra-high-net-worth clients with dedicated relationship managers and bespoke lending — is often the anchor of a family's banking structure. But most families who have built real organizational infrastructure around their wealth do not rely on a single institution. Concentrating everything at one bank creates operational risk: if that bank freezes an account during a dispute, suffers a technology outage, or changes its appetite for a certain type of client, the family feels it immediately.

Families typically maintain relationships with two to four institutions — a primary private bank, one or two commercial banks for operating accounts, and sometimes a regional or community bank for specific real estate or business lines. Each relationship serves a distinct purpose rather than duplicating the others. The goal is resilience and access, not complexity for its own sake.

Bank relationships also carry soft value. A relationship manager who understands a family's full picture can move faster on time-sensitive transactions, flag products worth considering, and connect the family to lending officers when credit is needed. Families often find that maintaining a meaningful deposit or credit relationship — rather than a token one — determines the quality of service they receive.

Custody vs. Brokerage: Not the Same Thing

A custodian is the institution that holds securities on behalf of an investor. It does not manage those securities or make investment decisions — it simply keeps them safe, processes corporate actions like dividends and splits, and produces account statements. A brokerage account is the account through which securities are bought and sold; it may or may not be held at the same firm acting as custodian.

For family offices, separating custody from investment management is a foundational control. When the firm that manages money is different from the firm that holds it, there is an independent third party verifying what is actually owned. This is one reason separately managed accounts — investment accounts where the family retains direct ownership of the underlying securities — are common in family office structures. The custodian's statement is an independent check on the manager's reporting.

Families with assets spread across public markets, private funds, real estate, and direct investments often work with a primary custodian for liquid securities and maintain separate arrangements for assets that cannot be held in a standard brokerage account. Private fund interests, for instance, are typically tracked through the fund administrator, not a custodian. This complexity is precisely why consolidated reporting matters — it pulls all of these sources into a single view of net worth.

Private Banking Services Beyond the Deposit Account

Private banks typically offer families a suite of services that goes well beyond checking accounts. Understanding the terminology helps families evaluate what they actually need versus what is being sold to them.

• Line of credit: A revolving credit facility — think of it as a pre-approved borrowing limit the family can draw on and repay repeatedly. Families commonly use lines of credit to cover capital calls on private fund investments, bridge real estate transactions, or manage cash flow timing without selling assets.
• Securities-backed lending: A loan secured by a portfolio of marketable securities, sometimes called a pledge loan or SBLOC. The lender uses the portfolio as collateral. Because the collateral is liquid and the lender can monitor it in real time, these facilities often carry lower interest rates than unsecured credit. They also carry real risk: if the portfolio value drops sharply, the lender may require additional collateral or repayment on short notice.
• Real estate lending: Private banks frequently offer mortgage and bridge loan products tailored to high-value properties — a primary residence, a ranch, or a commercial building held personally or in an entity. The underwriting often looks at total family liquidity rather than a traditional income-based debt-to-income ratio.

Families and their advisors — qualified attorneys and CPAs are essential here, particularly for any borrowing strategy with tax implications — evaluate credit not only on cost but on terms: what triggers a margin call, what covenants apply, and how the lender behaves in a downturn. The full picture of borrowing fits within a broader liquidity and risk framework that the family office maintains.

Account Titling Across Legal Entities

A family office typically operates through a web of legal entities — holding companies, trusts, LLCs, limited partnerships, and sometimes a dedicated management company. Each entity needs its own bank and custody accounts, and those accounts must be titled precisely in the entity's legal name. Sloppy titling — an account opened in a personal name when it should belong to a trust — can undermine the legal integrity of the entity and create estate, tax, and liability problems.

Account titling also determines who has legal authority to transact. Banks require corporate resolutions, operating agreements, or trust documents establishing who can open accounts, sign checks, and authorize wire transfers. Keeping these documents current — and updating the bank promptly when signatories change — is an operational discipline that family offices build into their governance calendar.

Families with family limited partnerships or family LLCs often discover that some banks are not equipped to open accounts for complex entity structures efficiently. Choosing banking partners with experience serving family offices, rather than standard retail or business banking channels, typically reduces friction.

Wire Controls and Fraud Prevention

Wire fraud is one of the most direct financial threats a family office faces. Wire fraud — the interception or spoofing of payment instructions to redirect funds to a fraudulent account — costs families real money and is rarely recoverable once the wire clears. Social engineering, where a bad actor impersonates a trusted contact to manipulate an employee into authorizing a transfer, is the most common delivery mechanism.

Family offices commonly address this through layered controls. An approval matrix — a documented policy that specifies who must approve transactions at various dollar thresholds — is a starting point. A wire for a recurring vendor might require one approver; a large or unusual wire might require two, including a senior principal. Dual control, where no single person can both initiate and approve a wire, is a widely adopted safeguard.

Verbal confirmation of wire instructions through a pre-established phone number — not a number provided in the email requesting the wire — is a simple but effective check. The cybersecurity posture of the office underpins all of this: strong email security, multi-factor authentication on financial platforms, and staff training on phishing reduce the odds that fraudulent instructions reach anyone with the authority to act on them. These wire controls connect directly to the broader bill pay and financial controls framework the family office maintains.

Treasury Policy: Preventing Both Fraud and Idle Cash

Treasury management — the active oversight of a family's cash positions across all entities and accounts — is often underbuilt in early-stage family offices. Cash that sits uninvested in a low-yield checking account is a quiet cost. Cash that runs too low in an operating account creates a scramble when payroll, capital calls, and property taxes land in the same week.

A written treasury policy gives the office clear rules. It typically defines a target cash reserve for each operating account, a sweep threshold that triggers a transfer of excess cash into a higher-yielding instrument, and a minimum liquidity buffer the family always maintains regardless of investment opportunities. The cash management page covers the investment side of idle cash in detail — money market funds, Treasury bills, and short-duration instruments that keep cash working without locking it up.

The treasury policy also addresses which accounts fund which obligations. A three-generation family with two operating businesses, a private foundation, and several trusts might have a dozen or more bank accounts. The policy maps cash flows: which account pays household operating expenses, which holds reserves for a real estate entity's capital expenditures, which receives distributions from private fund investments. Without that map, cash management becomes reactive rather than deliberate.

The family office's treasury function is not glamorous, but it is foundational. Investment returns mean little if the family cannot move money safely, cannot access liquidity when needed, and cannot account for where every dollar sits at any moment.

Putting the Banking and Treasury Structure Together

Banking, custody, and treasury are not standalone topics — they form the operational plumbing of the family office as an institution. A founder who sold her logistics company and is building a family office for the first time will typically start by establishing a primary banking relationship, selecting a custodian for her liquid portfolio, and drafting a simple treasury policy before anything more complex is layered on. The sophistication of the structure grows with the complexity of the assets and the number of entities involved.

Qualified attorneys are needed to properly structure and title accounts across entities. CPAs are essential for understanding the tax implications of borrowing against assets, holding cash in various entity structures, and sweeping funds between accounts. The banking and treasury layer is one place where legal, tax, and operational disciplines intersect — and where getting the details right from the beginning saves significant work later.