The cost of defined benefit (DB) schemes sponsored by FTSE 100 companies could double from £7bn to £14bn per annum by 2019, according to JLT Employee Benefits.
The forecast is based on its analysis that net employer contributions for a typical DB scheme have risen from 26% to 52% during the last three-year actuarial review cycle.
Companies due to have an actuarial valuation in 2016-17 are especially at risk of facing demands for increased contributions to cover higher deficits.
JLT Employee Benefits director Charles Cowling (pictured above) said: "With actuarial valuations coming up for many FTSE 100 pension schemes, 2016 and 2017 could see a huge increase in DB pension costs for those employers that still provide final salary pensions."
Unless action is taken, financial constraints could mean more DB schemes closing to employees and even lead to the insolvency of sponsors, Cowling added.
A number of firms including HSBC, Marks & Spencer, Royal Mail Group, Standard Life and Tesco have closed their DB schemes to all employees in the last year.
United Utilities withdrew plans to close its DB scheme last year pending the results of its 2016 actuarial valuation, after which a new consultation on pensions is expected.
This is defined as incurring ongoing DB service cost of more than 5% of total payroll.
The firm's additional research showed the total deficit in FTSE 100 schemes at 31 March 2016 is estimated to be £87bn, which is broadly unchanged from the position 12 months ago.
Only 29 companies disclosed a pension surplus in their most recent annual report and accounts while 59 companies disclosed pension deficits.
Cowling said: "As has been seen recently, if a company is in a really bad shape, a large pension deficit could tip it into insolvency. We therefore expect employers to be reviewing any remaining ongoing DB pension provision and monitoring their DB pension deficits very closely."
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