Your Cost Allocation Method Has to Be Written Down
Ask a finance office how they split the executive director's salary across three federal awards. If the answer arrives as a story rather than a document, there is no methodology. There is a habit, and habits do not survive staff turnover or an audit.
Cost allocation is the piece of the financial foundation that most often lives in one person's head. It is also the piece an auditor asks about first, because it touches every shared dollar in the organization.
What cost allocation actually is
Some costs serve one award. A caseworker funded entirely by one grant is straightforward. Other costs serve several at once, so the rent, the phone system, the finance director, and the IT contract all keep multiple programs running. Cost allocation is how you decide what share of each of those belongs to each award.
2 CFR 200.405. A cost is allocable to a federal award or other cost objective if it is assignable to that award in accordance with the relative benefits received. Relative benefits is the whole test. Your method has to reflect who actually got the value.
That standard rules out the two shortcuts organizations reach for under pressure. You cannot charge a shared cost to whichever award has room left in its budget, and you cannot move a cost to a different award because the first one closed. Both change the charge without changing the benefit.
Choosing a base that reflects the benefit
An allocation base is the measurement you divide by. The right base moves when the benefit moves.
Personnel time is the base for people who work across programs, measured by actual hours or effort rather than a planned percentage. Square footage works for occupancy, since a program using a third of the building reasonably carries a third of the rent. Headcount or device count works for IT and communications. Total direct costs, or direct salaries and wages, work for general administrative support that scales with overall activity.
The test is whether the number tracks the benefit. Allocating rent by each program's share of revenue fails that test immediately, because a program can double its funding without occupying another square foot. That kind of base survives internally for years and then collapses the first time someone outside the organization asks why.
Personnel carries its own documentation rule. Under 2 CFR 200.430, charges for salaries and wages have to be supported by records that reflect the work actually performed, not the budget you built at application. A planned split of sixty and forty is a budget assumption. It becomes a charge only when the records show it happened.
A cost allocation plan that lives in someone's memory is a single point of failure with your reimbursements attached to it.
What written down actually means
A cost allocation plan is a short document, not a compliance binder. Most of them fit on a few pages.
What the plan has to contain
- The list of shared costs, named specifically, not a category called overhead.
- The allocation base for each one, and why that base reflects the benefit received.
- Where the base data comes from, and who pulls it.
- How often you calculate, and how often you true up estimates to actuals.
- Who approves a change to the method, and where that approval gets filed.
- The effective date, so a reviewer can match a method to a period.
State and local governments have a more formal path when central service costs are involved, since 2 CFR 200 Appendix V governs statewide and local central service cost allocation plans and Appendix VII covers their indirect cost proposals. Nonprofits usually operate with an internal plan until they pursue a negotiated rate. Either way, the document exists before the money moves, and the same document supports both your drawdowns and your rate proposal.
Where allocation goes wrong
The findings repeat across organizations because the causes are ordinary. A method built on budgeted percentages never gets trued up to actual effort, so twelve months of charges rest on an estimate nobody revisited. A shared position gets charged entirely to one award because splitting it every pay period felt like too much work. The base changes mid year when someone realizes the old one produced an inconvenient result, and no document records the switch or the reason.
Each of those creates the same problem at audit. The organization cannot show that the charge matched the benefit, so the cost gets questioned, and questioned costs come back out of your pocket. Fixing the method afterward does not recover the reimbursement.
Write the plan while things are calm, use the same method across every funder, and true up on a schedule you set rather than one an auditor sets for you. A documented allocation method is also the raw material for the next decision, which is whether to keep taking the de minimis indirect rate or go negotiate one that reflects what your organization actually costs to run.
Download the Cost Allocation Starter, a free worksheet with plain language definitions, four questions that surface your own shared costs, two worked examples, and the warning signs that your current approach will not hold up.
