The monthly interest calculation is run by the Treasury & Investments team using balances as at the end of working day four of the month-end processing period. No further deposit movements should be processed after this date.
This varies monthly as interest rates move. The reduced rate of interest is 75% of the higher rate.
Monthly UDA rates are available on the Finance Division web page [1].
Interest is credited to all relevant departmental accounts each month by the end of working day five of the GL month-end closure (subject to any overdrawn accounts issues - see Overdrawn Accounts). It appears as a credit against the transaction code NBAA and will be available to spend or reinvest.