The aggregate deficit of pension schemes in the Pension Protection Fund (PPF) 7800 index has increased to £196.4 billion from £117.5 billion in just one month.
Figures from the PPF show that the deficit of the 6,533 defined benefit (DB) schemes in the index increased by almost £80 billion from the end of August 2011 to the end of September 2011.
The position has worsened from the same period in 2010, when a deficit of £40.2 billion was recorded.
The PPF update also found the funding ratio fell from 89.2% to 83.1%, lower than the 95.9% recorded in September 2010.
At the end of September, there were 5,345 schemes in deficit and 1,188 schemes in surplus.
The aggregate deficit of all pension schemes in deficit at the end of September 2011 is estimated to have increased to £220.9 billion from £154.0 billion at the end of August 2011. This compares to £95.7 billion as recorded at the end of September 2010.
Read more on defined benefit pension scheme deficits