Fiscal space is defined by the balance between government revenue (i.e. tax), denoted by T and government expenditure, denoted by G, through time. For instance, if G < T, then there is a fiscal surplus, but if G > T, then there is a fiscal deficit. A sustained or perpetual deficit through time results in build-up of annual deficits, leading to an unsustainable high debt. With a high level of debt, the government cannot borrow on the international market, and its ability to finance future deficits, i.e. the fiscal space is limited.