The total income of the Scottish voluntary sector more than doubled over an eight-year period to the financial year 2008/09, according to figures from the Scottish Council for Voluntary Organisations.
The SCVO's Panel Survey, which is based on data drawn from a representative sample of 827 organisations in 2008/09, shows that total income was £2.1bn in 2000/01, but had reached £4.4bn by 2008/09.
There has been sustained growth in total income since the figures were first recorded in 1997/98, when it was £1.8bn.
Nearly half of the sector's total income in 2008/09 was self-generated; 42.5 per cent came from the public sector, 11 per cent from voluntary donations and 1.4 per cent from lottery grants.
The figures also show that the proportion of total income emanating from local authorities fell from 28 per cent in 2006/07 to 21 per cent in 2008/09.
In 2008/09, the sector's income exceeded its expenditure by £123m, or 2.8 per cent of total income.
On average, larger organisations - defined as those with annual incomes of more than £100,000 - reported surpluses. By contrast, smaller organisations - those with annual incomes of less than £12,500 - reported deficits.