A structure for accounting and for the financial modelling of balances.
The closing balance is calculated from the opening balance, plus or minus the net inflow or outflow for the period.
The closing balance figure in turn provides the opening balance for the next period.
Last year’s closing balance (2020) on the balance sheet = This year’s opening balance (2021)
+/- This year’s flow (in or out in 2021) = This year’s closing balance (2021) on the balance sheet
The movement of the developing balance follows a sawtooth or 'corkscrew' path.
Hence the name 'corkscrew' for this structure.