Cash Reserve
Definition
A cash reserve is money set aside by a business to cover unexpected expenses, revenue shortfalls, or emergency situations. Maintaining an adequate cash reserve protects startups from cash flow disruptions and provides a buffer that prevents reactive decision-making during temporary downturns.
Overview
Cash reserves are the financial safety net that keeps a business operational when things do not go as planned. For startups, unexpected costs can include emergency engineering work, legal issues, customer refunds, or sudden increases in infrastructure costs. Revenue shortfalls from a lost enterprise deal or seasonal dip can also create cash crunches.
The appropriate reserve size depends on the business model, revenue predictability, and risk tolerance. A common guideline for startups is maintaining 3–6 months of operating expenses in reserve beyond the capital allocated for planned operations. Bootstrapped companies may need larger reserves due to the absence of investor backing as a safety net.
Cash reserves should be kept in highly liquid, low-risk accounts: savings accounts, money market funds, or short-term treasuries. The goal is preservation and accessibility, not returns. Tying reserve capital up in longer-term investments defeats the purpose of having an emergency fund that can be deployed immediately.
Example
A startup with $60K/month in operating expenses maintains a $200K cash reserve in a high-yield savings account, providing roughly 3 months of emergency runway beyond its operational budget.
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