Once you prepare your initial ARM Disclosures they are good for 1 year, unless your program changes.
Paragraph 19(b)(2).
5. Revisions. A creditor must revise the disclosures required under this section once a year as soon as reasonably possible after the new index value becomes available. Revisions to the disclosures also are required when the loan program changes.
Your closing documents will reflect the current index, margin and rate.
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The opinions expressed are mine and they are not to be taken as legal advice.