The government has said it is unlikely to lift a ban on transfers into and out of NEST or remove the cap on contributions, after the Work and Pensions Committee recommended it do both "as a matter of urgency".
It said there was no clear evidence to suggest the restrictions would act as a barrier to NEST achieving its goals, although it said it would "reflect further" on the issues raised by the Committee.
The Work and Pensions Committee had argued the transfer ban could be disruptive for individuals who would like to consolidate existing separate pension pots into their NEST savings, and for employers who would like to operate a single occupational pension scheme.
It added the contribution cap could cause "severe complexity" for businesses as it would mean that employers with higher-paid employees could not use NEST as their single pension scheme.
But in its response to the Committee, the government said: "If there are barriers, or perceived barriers, to employers choosing NEST, where it is appropriate for them to do so, the government needs to consider carefully what can be done to remove them.
"However, the evidence that the NEST restrictions are acting as a barrier is not unequivocal and the government is conscious that the restrictions were designed to ensure that NEST's focus remained on its target market."
The government did not address whether a ban on transfers would eliminate the possibility of using NEST as a home for small pension pot consolidation. It said it would publish the findings from its consultation on this issue this summer.
Meanwhile, the government said it may look again at the potential benefits of allowing individuals early access to pension savings - but only once auto-enrolment had been fully phased in.
It said if it could be determined that people's inability to access their pensions was a reason why they opted out of auto-enrolment, it may carry out further research into its potential benefits.
The Committee had asked the government to consider the implications of enabling individuals to withdraw pension savings to buy a first home.
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