cashflow
Cash Reserve
Cash buffer kept separate from operating cash. The shock absorber for the business.
Definition
A cash reserve is a dedicated balance held against unexpected expenses, revenue dips, or strategic opportunities. The standard benchmark for service businesses: 3-6 months of operating expenses, kept in a separate account from operating cash so it can't be casually spent. The reserve is what lets you survive a major customer loss, a slow quarter, or an unexpected investment opportunity without scrambling for emergency credit.
How much reserve is enough
Standard US small business benchmark: 3 to 6 months of operating expenses held as cash reserve, separate from operating accounts. The right number within that range depends on revenue volatility, customer concentration, and capital access. Lower end of range (3 months) acceptable when: revenue is predictable recurring (SaaS, retainers, subscriptions), customer base is diversified (no customer over 10 percent of revenue), and you have an approved line of credit as backup. Higher end of range (6 months or more) needed when: revenue is project-based and lumpy, you have customer concentration above 20 percent in one buyer, you lack credit access, or you operate in cyclical industry (construction, retail). Pre-pandemic many US service businesses ran 1 to 2 months reserves and survived; post-2020, 4 to 6 months has become the new normal.
Where to keep cash reserves in the US
Operating cash and reserve cash belong in different accounts and often different institutions. Reserve options ranked by yield as of 2026 (approximate): Treasury bills (3-month T-bills around 4 to 5 percent, fully FDIC-equivalent because backed by US government), high-yield business savings (4 to 5 percent at Mercury, Brex, Relay, Live Oak), money market funds (4 to 5 percent at Fidelity, Schwab, Vanguard for business accounts), CDs (4 to 5 percent for laddered 3 to 12 month CDs). FDIC insurance covers 250K per depositor per bank; large reserves should be split across institutions or use IntraFi Cash Service which spreads deposits across FDIC-insured banks while maintaining single relationship. Avoid keeping reserves in low-yield checking earning 0.01 percent; the foregone yield on 500K of reserves is 20K to 25K per year.
Rules for using reserves
Define written rules before you need them, because emotional decisions in stress are usually wrong. Acceptable reserve uses: covering a defined revenue gap during recession or major customer loss (3 to 6 months runway extension), funding a clearly-positive strategic opportunity (acquiring a competitor, hiring a key person, capital purchase with strong ROI), bridging known cash flow timing gaps (annual insurance premium, tax payment). Unacceptable reserve uses: covering ongoing losses that are not being addressed, funding marketing experiments without success criteria, paying owner draws to maintain personal lifestyle when business cannot afford them. Replenishment plan: when you draw down reserves, define a written schedule to rebuild (typically 6 to 18 months) tied to monthly cash flow.
Reserve building strategy for US businesses
Two paths to build reserves from zero. Path one, profit allocation: route a defined percentage of monthly profit (typically 10 to 20 percent) automatically into a reserve account on the same day each month. Mike Michalowicz's Profit First method formalizes this approach. Behavioral consistency beats trying to save 'what is left over' (which is always zero). Path two, growth funding: temporarily delay growth investments and direct surplus cash to reserves until target is hit, then resume growth. Best for businesses approaching financial fragility. Hybrid approach for most US small businesses: contribute 10 percent of monthly revenue automatically while maintaining moderate growth spend, until reaching 3 months OpEx target. Then increase to 15 to 20 percent until reaching 6 months target. Then redirect to growth or distributions.
FAQ
Should I keep reserves in dollars or split across currencies?
For US-domiciled businesses with USD-denominated expenses, keep reserves in USD. Currency diversification adds volatility without reducing risk for businesses whose expenses are USD. For US businesses with material foreign currency expenses (UK office, EU contractors), holding some reserves in the corresponding currency reduces FX risk on operations. Multi-currency business accounts at Mercury, Wise, or Brex support this without commercial bank complexity. For businesses with no foreign exposure, keep it simple - all USD.
Are cash reserves taxed?
The cash itself is not taxed; the interest earned is. US business interest income from reserves (T-bills, savings accounts, money market funds) is taxable as ordinary income to the entity. For pass-through entities, it flows to owners' personal returns. For C-Corps, taxed at corporate rates. Tax-efficient reserve placement: municipal money market funds offer federal tax exemption (state tax exemption if you buy your home state's munis) with lower yield; for high-tax-bracket owners, the after-tax yield is often comparable to taxable alternatives. Discuss with your CPA before optimizing.
What if my reserve is in an FDIC-insured bank that fails?
FDIC insurance covers up to 250K per depositor per insured bank. After the 2023 Silicon Valley Bank failure, federal regulators uninsured all deposits at SVB and Signature Bank, but this was an exceptional intervention not a permanent policy. For US businesses with reserves above 250K, three protection strategies: split deposits across multiple banks (max 250K per bank), use IntraFi Cash Service / CDARS to spread deposits across FDIC banks while maintaining one banking relationship, hold reserves in Treasury bills purchased directly through TreasuryDirect or via brokerage (Treasuries are not FDIC-insured but are backed by the US government, generally considered safer than bank deposits).
Should I use my reserve to pay down debt?
Generally no until reserves are at target. The math: paying down debt saves interest at debt rate (typically 7 to 12 percent for US small business debt). Holding reserves earns 4 to 5 percent in T-bills. Net cost of holding reserves over paying debt: 3 to 7 percent annually. This is the price of optionality - the ability to handle surprises without scrambling for emergency credit at distressed rates. For most US small businesses, that optionality is worth far more than 3 to 7 percent. Once reserves exceed 6 months OpEx, then evaluate debt paydown against alternative uses including investment yield and growth investment.
How often should I review reserve adequacy?
Quarterly. Reserve target should be re-evaluated alongside business changes: revenue growth (operating expenses grow, so dollar reserve target grows), customer concentration changes, new debt or credit lines, industry conditions, and team scale. A US service business growing from 500K to 2M revenue may need to grow reserves from 75K to 300K to maintain the same 3-month coverage. Reserve adequacy is a moving target, not a one-time achievement. Set a calendar reminder to recalculate target at quarter-end alongside monthly operating expense review.
In your business
- →Build to 3 months of operating expenses first, 6 months long-term
- →Keep it in a separate account - high-yield savings or money market - not commingled with operating cash
- →Don't dip in for non-emergencies - if you use it, replenish on a clear schedule