Supporting documents are submitted with Form I-140G through the official portal, following the instructions USCIS provides after the application and fee. Rather than assembling a speculative financial file, list what already exists, such as ownership records, sale agreements and statements, and note which items depend on a transaction that has not closed yet.
Track which papers a pending sale controls
A signed contract, an escrow date, or a lender approval can decide whether a document is available in a given month. Mark each item as held, expected, or uncertain, and keep the uncertain ones visible when discussing timing. If USCIS later asks for something further, an organised set of records shortens the response.
Requesting every conceivable statement in advance costs money and produces material that may never be relevant. Build the list around events rather than around document types. For each item, record who holds it, what has to happen before it can be produced, and roughly how long that takes: a solicitor's completion statement follows a sale, a company valuation follows a year end, a lender's confirmation follows an application.
Written that way, the list shows at a glance which months are constrained and by what. It also prevents the common waste of instructing valuations and translations for material that the instructions may never call for, which costs money now and produces documents that may be out of date by the time they are wanted.