Projected costs of enforcing the auto-enrolment regime were redacted from the Making Auto-enrolment Work Review but are substantial, delegates heard.
Pension experts have broadly welcomed Treasury plans to consult on allowing access to 25% of pension savings tax free before retirement but warn the new rules must be kept as simple as possible.
The annual contribution cap and pension transfer ban should be retained in NEST's initial period but it is essential they are both reviewed in 2017, David Yeandle says.
The exclusion of micro-employers from auto-enrolment was ruled out due to the number of employees that would be excluded and because of "substantial" practical issues.
The findings of the independent review into the operation of auto-enrolment will be released next week, pensions minister Steve Webb confirms.
Introducing the National Association of Pension Fund's proposal for a simple, single state pension would "really help" the auto-enrolment reforms, Adrian Boulding says.
Treasury plans to curb the annual allowance to about £40,000 rather than slash tax relief for high earners have been backed by the industry.
The independent panel of experts tasked with assessing the viability of auto-enrolment and NEST has finished a run of seminars with stakeholders.
Enabling people to work one more year after state pension age could result in a GDP increase of 1% or £13bn says Legal & General wealth policy director Adrian Boulding.
The government has announced it will undertake an independent review of auto-enrolment.