A common benchmark is three to six months of operating expenses held in unrestricted reserves. That is a starting rule of thumb, not a legal requirement, and the right level depends on how steady your revenue is.
The more volatile or unpredictable your income, the more cushion you want. An organization living on a few large grants or one big annual event generally needs reserves toward the upper end (or beyond), while one with diverse, recurring revenue may be comfortable nearer the lower end. Reserves should be calculated only from unrestricted net assets: money with donor or grant strings attached cannot legally be spent on general operations, so it does not count as a true reserve. Many boards formally designate a portion of unrestricted funds as a "board-designated operating reserve" so the intent is clear.
The single most important step is adopting a written reserve policy by board vote. It should state your target (for example, in months of expenses), how the reserve may be tapped, who approves drawing it down, and how it gets replenished. Funders and auditors look for this policy as a sign of healthy financial governance, far more than they look at a specific dollar figure.
A simple operating-reserve calculation helps: divide your total unrestricted, available funds by your average monthly operating expenses to see how many months you could cover. This is general information, not legal or financial advice; confirm specifics with a CPA who knows nonprofits.
What to do next
- Calculate your current ratio: total unrestricted available funds divided by average monthly operating expenses equals months of reserve.
- Set a target range (often 3-6 months) based on how predictable your revenue actually is.
- Draft and adopt a board-approved reserve policy covering the target, draw-down approval, and replenishment.
- Review the policy and your reserve level with your treasurer or CPA at least once a year.
A quick note
This is general information for nonprofits, not legal, tax, or accounting advice. Rules and figures change and vary by state — verify with a qualified professional before you act.
Sources & tools
Free, primary sources
- National Council of Nonprofits — Operating Reserves for Nonprofits — Explains why each nonprofit should set its own reserve level, why reserves should be unrestricted, and the value of a board-adopted reserve policy covering when and how reserves are used and replenished.
- National Council of Nonprofits — Where Should My Nonprofit Keep Its Operating Cash? — Practical guidance on holding and managing operating cash and reserves, including FDIC/NCUA-insured accounts.
- IRS — Charities and Nonprofits: Annual Filing and Forms — Authoritative source on 990-series filing duties (including the Form 990-N e-Postcard option for small organizations with gross receipts normally $50,000 or less) and automatic loss of tax-exempt status after three consecutive years of non-filing.
Last verified 2026-06-17. Rules and figures change — verify at the source before you act.
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