In a special order situation, any fixed cost associated with the order would be irrelevant.

Fixed Cost

A cost that remains constant, in total, regardless of changes in the level of activity within the relevant range. If a fixed cost is expressed on a per unit basis, it varies inversely with the level of activity.

Special Order

A one-time customer order, often at a negotiated price, that is outside the company's standard range of products or services.

Irrelevant

Pertains to information or factors that do not influence or impact a decision-making process.