GNMA reporting rewards precision and punishes drift. A single mis-mapped loan ID early in the month can cascade into a reconciliation headache by cutoff.
The most frequent issue we see is a mismatch between the servicer's trial balance and the pool-level remittance file — usually caused by a timing difference in how prepayments are recognized.
Second most common: custodial account interest that is calculated on the wrong day-count convention, which quietly throws off P&I remittance by a few basis points that then require manual correction.
Building a mid-month reconciliation checkpoint, rather than waiting for the report deadline, gives issuers time to correct discrepancies without triggering compliance follow-up.