Fewer than half (44%) of employers oppose increases in minimum automatic enrollment (AE) contributions above 8%, according to an Association of Consulting Actuaries (ACA) study.
By 2019, the government is increasing minimum contributions to a total of 8%, with a minimum of 3% to be paid by the employer.
The firm's report states it is forecasted this will increase median opt-out rates to 16% to 20%, from the current 11% to 15%.
However, the study which was conducted in July 2017 involving 466 employers with 760 schemes, also revealed 41% said they support a gradual increase in minimum AE contributions post April 2019.
It further found over 12 million employees in smaller firms are still being ruled ‘not eligible' for automatic enrolment (AE). This was based on a category of employers with 1-9 employees, in which the median band of those not eligible for AE was 41-50%.
The poll also demonstrated under half (46%) said they oppose reducing the lower ‘trigger point' for AE, which currently resides at £10,000 per annum earnings - while 44% said they support a lowering of the AE threshold - and over half (57%) think the self-employed should be brought into AE.
ACA chairman Bob Scott said: "We believe the government needs to develop a coherent ‘next steps' strategy that is ready to address the anticipated potential danger of rising opt-outs as employers - particularly small and micro-employers - and their employees react to the increase in minimum contributions in 2018 and 2019.
"The survey points to the need - part of what we see as the ‘next steps' strategy - that looks to a gradual, but essential increase of the default level of contributions into defined contribution schemes."
He added this is needed to ensure that many more people save sufficient amounts for an adequate retirement income, and a gradual increase in minimum contributions to eventually around 16% of earnings should be a target.
"Without commitment from government to ensure that sums saved into AE are meaningful, there is little prospect that as a society we will be able to address the fears of a growing gulf in retirement incomes from one generation to the next."
Other key findings
Under three quarters (72%) of employers said they support capping an individual's contributions to social care costs, and 59% support a compulsory social care insurance scheme.
Such scheme would mean working-age adults would be required to pay into a privately managed fund each month.
The survey further found 79% of those polled agreed they support a lower state pension being flexibly accessible from age 66 as the state pension age rises.
As it stands, the full state pension is £159.55 per week. This will increase by 3% in April 2018, and the state pension is set to increase to 68 between 2037 and 2039.
The same study found over three quarters (77%) of employers said they favour retaining the current pension tax relief structure, but with more help targeted on lower income earners, and 13% support moving to pensions being paid tax-free, with pension tax relief abolished.
Some 80% said legacy defined benefit (DB) scheme costs are creating inter-generationally unfair consequences, and over three quarters (79%) said they support tougher penalties for the mismanagement of schemes.
Other findings showed 90% agreed security and data cleansing needs sorting out before the pension dashboard goes ahead - which the government is aiming to make available from 2019 for savers to see all their pension savings in one place.
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