Code 1 = home purchase Code 2 = Home Improvement and Code 3 = Refinancing.
If you have a multiple purpose loan then follow 1, 2 and 3. Which ever comes first is what you report. The dollar amount does not play a factor. So you're correct, a home purchase trumps both home improvement and a refinancing and home improvement trumps a refinancing.
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The opinions expressed are mine and they are not to be taken as legal advice.