What Are GST Credit and Debit Adjustments? The GST return form allows businesses to make credit and debit adjustments to reflect changes in GST claims or liabilities. These adjustments are necessary when there’s a difference between the GST initially claimed or paid and the actual GST amount owed or refundable. Credit Adjustments A credit adjustment means you’re making an additional GST claim. This typically happens when you realize you’re entitled to claim more GST than you initially did. For example, if you discover that you missed claiming GST on an eligible expense, you can include this adjustment in your GST return. Debit Adjustments A debit adjustment means you need to repay some of the GST you previously claimed. This often occurs when the actual use of an asset is less than what was initially claimed. For instance, if you claimed GST on a mixed-use asset (like a Charter boat) but used it less for business purposes than expected, you’ll need to make a de bit adjustment in ...