Below-the-line item in public sector accounting means such an item is

In public sector (government) accounting, the main budget statement is divided by a dividing line that separates ordinary recurrent and capital revenue and expenditure, which are the items that have been formally planned for and approved in the year's budget, from special or unplanned transactions that fall outside the normal appropriation.

Items placed above the line are the regular revenue and expenditure heads that were anticipated and included when the budget was drawn up. Items placed below the line are transactions that were not part of that planned budget for the year, such as unforeseen financing transactions, supplementary items, or receipts and payments that arise outside the normal budgeted programme. Describing an item as "below-the-line" therefore signals that it was not budgeted for in the current fiscal year.

A common misconception is to treat "below-the-line" as meaning the amount fell short of what was budgeted. That is incorrect: the term is about whether an item appears in the approved budget at all, not about whether a budgeted figure was met or exceeded.

When you see "above/below the line" in a government accounting question, check whether the item was part of the original budget provision; if it was not, it belongs below the line.