Preparing a U.S. document for use in Spain involves a variety of costs that go beyond the basic apostille. You'll need to account for the official state or federal apostille fees and notary charges for any required signatures. Many documents also require sworn, certified translations into Spanish. These translations ensure legal validity and acceptance by Spanish authorities.

Other expenses include shipping and return delivery, and, if you choose professional services that handle document review, submission, and tracking for a smoother process. Miscellaneous costs, such as travel to in-person drop-off locations, rush or expedited processing, and extra copies or document preparation, can add up as well.

Underestimating total cost is one of the most common reasons people use slow mail processing when expedited is the safer option. Budget for apostille fees, notarisation, sworn translation ($80–150 per doc), and FedEx return shipping as one combined line item.