Having substantial wealth does not eliminate the need to think carefully about cash. An individual or family can own valuable real estate, hold a sizable investment portfolio, and still need a plan for an upcoming tax payment or major purchase.

The right cash balance is not necessarily a percentage of net worth. It should reflect what the money needs to do, when it will be needed, and how the rest of the financial picture is structured.

For high-net-worth individuals and families, cash is more than an emergency fund. It is part of the financial plan—and it should have a defined purpose.

Start With Obligations, Not a Percentage

A useful starting point is to separate liquidity needs into three categories.

• Spending and income needs. How much of your regular spending must come from investments after accounting for reliable income? An individual or family whose income covers expenses has a different reserve requirement from someone funding a lifestyle through portfolio withdrawals.
• Known obligations. Upcoming taxes, tuition, renovations, property purchases, planned gifts, and private-investment commitments should be considered separately. Money already committed to a specific expense should not also be counted as available investment capital.
• Flexibility and unexpected needs. A contingency reserve can provide room for changes in circumstances. Additional cash held for investment opportunities should have a clear purpose and a plan for deployment—not simply remain uninvested indefinitely.

The distinction matters. Cash reserved for an April tax payment is not necessarily evidence that a portfolio is too conservative. It may simply be money that already has a destination.

What That Might Look Like in Dollars

Consider a hypothetical investor who needs $120,000 annually from investments after accounting for other income. The investor also has a separate $250,000 tax obligation and a $100,000 renovation planned.

An illustrative reserve might include:

• $180,000 for portfolio withdrawals: Eighteen months of the expected spending gap.
• $350,000 for known obligations: The tax payment and renovation.
• $70,000 for contingencies: An additional cushion for unexpected needs.

That produces a $600,000 liquidity target.

The eighteen-month horizon and contingency amount are examples, not universal recommendations. The appropriate amounts depend on income stability, spending flexibility, investment risk, and other available resources.

This is also a total liquidity target—not an additional $600,000 on top of cash already held in checking, savings, or investment accounts.

The important point is that the number comes from actual needs rather than an arbitrary allocation.

“Cash” Does Not Mean Everything Belongs in Checking

Once the reserve is established, the next question is where each portion belongs.

For bank deposits, review both the interest rate and insurance coverage. Standard FDIC coverage is $250,000 per depositor, per insured bank, per ownership category. Opening several accounts does not necessarily create additional coverage.

Money market funds can serve as a place to hold short-term reserves, but they are investments—not bank deposits. They are not FDIC-insured, and loss is possible. Their income can also change with short-term interest rates.

Treasury bills can be selected with maturities that align with known obligations. Their interest is subject to federal income tax but exempt from state and local income taxes.

A short-term bond fund should not automatically be treated as cash. Like other mutual funds, it can lose value; the ability to sell shares does not guarantee the amount available when you sell.

The decision should consider access, maturity, risk, expenses, and after-tax income—not just the highest advertised yield.

A Credit Line Is Not the Same as a Cash Reserve

Borrowing against a portfolio may help bridge a temporary funding need without an immediate investment sale. But a securities-backed line of credit introduces interest expense and collateral risk. A market decline can lead to demands for additional collateral or repayment, and the lender may sell investments if those requirements are not met. These loans also generally cannot be used to purchase securities.

For that reason, borrowing is better evaluated as a financing decision with a repayment plan—not assumed to be an interchangeable substitute for cash.

Ask: What repays the loan? What happens if the portfolio falls? Would the arrangement still make sense if interest costs increased?

Give Excess Cash a Decision Date

Once a tax payment is made or a renovation is completed, revisit the reserve. Money that once had a specific job should not remain earmarked for an expense that no longer exists.

Likewise, cash held for an investment opportunity deserves periodic review. What would cause you to invest it? Has the original reason for holding it changed?

The goal is not to minimize cash at all costs. It is to hold enough to support your obligations and flexibility, while making a deliberate decision about the money intended for longer-term growth.

The most useful cash balance is one you can explain—in dollars, by purpose, and by time frame.

Disclosure: This article is for educational purposes and is not individualized investment, tax, or legal advice. The example is hypothetical. Investments involve risk, including possible loss of principal. Cash-management and borrowing strategies depend on individual circumstances. Bishop Capital Advisors LLC does not provide tax or legal advice.