Allocate shared costs across grants

What You Will End Up With

You will end up with two things: a worksheet that splits each shared cost across the grants that benefit from it, in proportion to the benefit each receives, and a written allocation plan that a reviewer can follow to rebuild your numbers.

You need both because a cost that benefits more than one grant cannot simply be charged in full to one award. Doing so misstates what each project really cost, and undocumented allocation invites expense rejection and double-charging. With a documented split you can show your working when a funder asks.

Before You Start

Pull together the following before you calculate anything.

• The list of shared costs. These are expenses that benefit several funded projects and cannot be wholly attributed to one. Typical examples are rent, shared staff, shared equipment and IT support.
• The evidence for possible bases. Timesheets for staff, square footage for premises, and usage logs for equipment and vehicles are the usual sources. If the data does not exist yet, start collecting it now.
• Each funder's terms on methods. If you are unsure which method a funder will accept, ask its contact in writing before you settle on one.

Also decide who in your leadership will approve the method, before you allocate any cost.

Steps

1. Separate direct costs from shared costs. A cost incurred for one award only is charged to that award directly, and needs no allocation. What remains are costs that benefit more than one grant. Keep these apart from indirect costs, a frequent point of confusion. A shared cost is still a direct cost, and you justify it individually with an explicit allocation key. Indirect costs usually follow a fixed rate.

2. Choose one primary base for each category. A base is the measure you use to divide a cost in proportion to benefit. Match it to the cost:

   • Staff time: documented percentage of effort, ideally from timesheets, which are the most precise and defensible option if you have a reliable time-tracking system.
   • Premises and rent: floor space.
   • Equipment and vehicles: usage logs such as machine hours, sample counts or compute time. Reviewers regard these as strong support.
   • Support services such as IT and leadership: number of people or headcount.
   • Residual overhead: budget share. It is simple and commonly accepted, but it rarely reflects actual resource use, so treat it as a fallback.

   Most organizations end up combining methods, but each cost category gets one primary driver.

3. Test the base before you use it. Ask four questions. Is there a logical link between the base and the cost? Will you apply it consistently to every grant, funder and cost center that benefits? Could a reviewer reconstruct your calculation from your documents? Was it chosen for genuine benefit? A method picked because it recovers more on one award is not acceptable, even if the arithmetic is correct. Some regulations allow any reasonable, documented basis where proportions cannot readily be determined, so check your funder's terms before you rely on that.

4. Calculate the split. Divide the cost by the base for each grant. These worked figures come from different guides, so the currencies differ:

   • By space: a monthly space cost of $3,000 for two labs of 1,600 and 1,200 square feet splits roughly 57 percent and 43 percent, not evenly.
   • By budget: if Program A is 60 percent of the consolidated budget and Program B is 40 percent, shared charges follow that 60/40 split.
   • By effort: an employee who spends 40 percent of time on one award and 60 percent on another has the cost follow that 40/60 split.
   • By people: two projects each have £7,500 in direct staffing and share £2,000 a year in running costs equally, so each project's full cost rises to £8,500.

   For three or more grants, lay it out in a table. This one is an illustration. It reuses an occupancy split of 80, 15 and 5 percent that a guide gave for classrooms, administrative offices and computer storage, here applied to three grants. Your shares must add up to 100 percent. Replace the bracketed items with your own figures.

5. Record it and check it monthly. Keep a worksheet with the expense, the base and the result for each grant. Every month, confirm that the allocations sum to the total shared cost, that no cost is charged 100 percent to two funds, and that the rates match the keys in your policy.

6. Write the allocation plan and set a review. For each category of shared cost, record what it is, who benefits, which base you use, and how the base is calculated and updated. Have leadership approve it and apply it consistently all year. Review it annually. Do not change a base mid-year unless operations change materially, because a mid-year change is an audit red flag.

Common Mistakes

Defaulting to an even split. An even split with no calculation is a common audit failure, because nothing links it to actual benefit.

Treating shared costs as indirect costs. Shared costs stay direct and need their own keys and justification.

Changing the method mid-year, or never updating a base. A base that is not updated after the facts change fails review.

Picking a base to maximize recovery on one grant. Without a real benefit relationship the choice is unacceptable, whatever the arithmetic says.

Charging one cost in full to two grants. A monthly consistency check catches it.