We received a new appraisal after filing Form 706-NA. Is there a formal supplemental-return path, or do we just mail an explanation?
The estate filed Form 706-NA on time, but a later appraisal changed the value of one major U.S. asset. We do not want to ignore the updated number, but we also do not want to send the IRS an unstructured letter if the form instructions already provide a cleaner correction method.
The procedural question matters most here. If the right answer is a supplemental Form 706-NA with the original return attached and an explanation of what changed, we want to build exactly that file instead of improvising a correction that the IRS may not process well.
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