Allocable Cost

An allocable cost is a cost that is properly assignable to a particular government contract or final cost objective under FAR 31.201-4, because the cost is incurred specifically for the contract, benefits the contract along with other cost objectives and is distributed rationally between them, or is necessary to the overall operation of the business and fairly apportioned to the contract.

What is an Allocable Cost?

Allocability is one of the four tests a cost must pass to be allowable on a government contract (reasonableness, allocability, CAS/GAAP consistency, and no specific prohibition). FAR 31.201-4 defines a cost as allocable when it meets any of three criteria: it is incurred specifically for the contract; it benefits both the contract and other work and can be distributed to them on a rational basis; or it is necessary to the overall business and the amount assigned to the contract is determined through a process that is equitable and consistent with similar costs of other contracts.

The allocability concept addresses the fundamental challenge of cost accounting for multi-contract organizations: how to fairly distribute shared costs (facilities, management, corporate functions) across multiple contracts without over-allocating costs to any single contract. An allocation is rational if it reflects the actual relationship between the cost and the contracts, allocating facility costs based on square footage used, allocating management time based on the proportion of hours dedicated to each contract, allocating IT infrastructure costs based on the number of users on each contract.

Direct costs, costs incurred specifically and exclusively for one contract, are allocated to that contract in full. Indirect costs, costs that benefit multiple contracts, are accumulated in pools (fringe, overhead, G&A) and allocated to contracts through the pool's allocation base. The allocation base must rationally connect the pool cost to the contracts receiving the allocation: a labor-based overhead pool is allocated based on direct labor because labor drives the overhead costs; a material handling pool is allocated based on direct materials because those costs drive the handling function.

Misallocating costs, charging specific-contract costs to the wrong contract, or using an allocation base that does not rationally connect pool costs to the contracts receiving them, violates CAS and FAR Part 31 and is a DCAA audit finding.

Why Allocable Costs Matter for Government Contractors

Allocation disputes are among the most contested issues in DCAA audits and government contract cost claims. The government frequently challenges whether indirect cost allocations are rational, arguing, for example, that a contractor's overhead pool contains costs that primarily benefit commercial work but are being allocated to government contracts through a shared pool. Contractors with mixed commercial and government businesses face the greatest allocability scrutiny and must demonstrate that their allocation methodology equitably distributes costs between government and commercial work.

Example

A defense engineering firm provides IT support at three government sites and maintains its corporate office in Tysons Corner. Facility costs for the three government sites ($890,000 annually) are allocated directly to the respective contracts based on square footage used by contract staff, they are direct costs, fully allocable to specific contracts. The Tysons corporate office cost ($340,000 annually) is indirect, it supports all operations, not any single contract. The firm allocates it to the G&A pool and distributes it across all contracts using total cost input as the allocation base, a rational distribution because corporate functions support all contracts proportionally to their cost volume.

Frequently Asked Questions

Can the same cost be both allocable and unallowable?

Yes. Allocability and allowability are independent tests. Entertainment costs are often allocable to a specific contract (incurred for a client meeting directly related to contract performance) but are still unallowable under FAR 31.205-14. A cost must pass all four tests to be billable, being allocable is necessary but not sufficient. Conversely, a cost can be allowable (not prohibited by FAR 31.205) but not allocable to a specific contract (no rational connection between the cost and that contract), making it unclaimable for that contract even if it could be billed through an appropriate indirect pool.

What is the "rational basis" test for indirect cost allocation?

A rational basis means the allocation base reasonably measures the relationship between the indirect cost pool and the contracts being charged. DCAA evaluates whether the chosen base would be expected to drive the costs in the pool, if the pool is dominated by labor-intensive activities, a labor hour or labor dollar base is rational; if the pool is dominated by occupancy costs, a square footage base is rational. An allocation base that does not logically connect to the cost driver fails the rational basis test and results in questioned costs.

How does contract mix affect allocability analysis?

Contractors with a mix of cost-type and fixed-price government contracts, plus commercial work, must ensure their indirect cost pools are allocated equitably across all work types. A contractor that allocates its highest-cost overhead pools primarily to government cost-type contracts while shielding commercial work or FFP contracts from those costs creates an allocability distortion that DCAA will challenge. Similarly, using a narrow allocation base (one that excludes commercial work from the denominator) inflates the government's share of indirect costs. Equitable allocation requires the base to include all work benefiting from the pool, not just government cost-type work.

What are "direct versus indirect" cost classification disputes?

DCAA frequently disputes whether costs a contractor classified as direct (contract-specific) should have been classified as indirect (shared across contracts), and vice versa. The most common version: a contractor charges individual employees' workstations, software licenses, or administrative support directly to single large contracts, when those resources actually benefit multiple contracts. DCAA's position is that these costs should be in an indirect pool and allocated across all contracts. Contractors must document specifically why a cost benefits only one contract when making a direct charge determination, general convenience is not sufficient justification.