Hazard Ins reserve - 500
RE Tax Reserve - 400
Aggregate adjustment - (100)
Your initial Escrow deposit should be 800
Applying a credit to the principal balance is not compliant with the escrow accounting rules.
Rembrandt will do the escrow account analysis as required. It's not very user friendly: you basically have to do manual calculations and it is a royal PITA but it will provide the initial escrow analysis statement and HUD correctly. We switched to ARTA due to its easier use.
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The opinions expressed are mine and they are not to be taken as legal advice.