The work may include donor-record collection, translations and professional review of the gift and source history. These are separate from invested capital, government filings and project administration charges.
Budget for all contributors’ evidence
Request a quote that reflects the number of donors and countries involved. Obtain qualified advice on any tax or reporting consequences without assuming that an immigration gift letter resolves them. If the donor also pays fees, preserve the source and payment records for those amounts.
Clarify which expenses are refundable under the relevant agreement and which government or professional charges are not. Budget for evidencing two financial histories rather than one, since the donor's file is frequently the larger of the two. That can include archived bank statements, official copies of tax filings, corporate or property records where the donor's wealth arose that way, certified translations, and professional assistance in another jurisdiction.
Some of those carry charges, and institutions holding older records may bill for retrieval. Allow also for the possibility that a second donor becomes necessary if one person's records prove incomplete, which effectively repeats the exercise. None of this is investment; it is preparation, and it should be scoped before it is commissioned.
Where the gift attracts tax or reporting obligations for the donor, obtain advice on that separately, since it is a question for a tax adviser rather than an immigration one.