Moving to a flat-rate single tier state pension will take the risk out of advising people on whether it pays to save for retirement, MPs heard.
The coalition's state pension reforms mean from April 2017 everyone who achieves a 35 year National Insurance record will receive £144 per week in retirement.
One of the main aims of the reforms is to make it fairer and simpler for women to get a full state pension. A credit system for caring will apply, meaning looking after children or elderly people will not result in NI record gaps.
Steve Webb's policy was broadly welcomed but analysis of projections found some people will lose out in the longer term due to the interaction with means-tested benefits.
Baroness Hollis told the work and pensions select committee hearing, the first in a series which will probe the latest Pensions Bill, that the policy would make it easier to give advice to women on whether it pays to save for retirement.
She said: "Without this reform it would be almost impossible to advise people, particularly women on auto-enrolment opt-out. It does take the risk out of the advice, and I hope therefor the risk for women."
However, she admitted there was an element of "Russian roulette" to advice in this area due to how means-tested benefits operate with savings.
Concerns around whether it will pay for lower earners to save for retirement have plagued auto-enrolment since its inception.
MPs also heard concerns about a specific cohort of women who will still "fall through the gaps".
Pension consultant Ros Altmann and Baroness Hollis told the committee until the new reforms came into force some women - who retire before the state pension ages are equalised - would be worse off.
Institute of Fiscal Studies economist Paul Johnson told MPs some people would lose out in the long run.
"In the long run it is not giving more to lower earners. It is giving less to low earners, to women than if the current system remains in place. They will get lower state pension income in 2060 than they would have done."
Hollis added: "There are different winners and losers notionally the further down the line you go. What is key is to ensure there is sufficient coverage for credits, particularly for carers. We need to smooth out the volatility of women's caring lives.
"It makes it safe to save, we should not see this in isolation in terms of what is happening with auto-enrolment. Put the two together and even the notional losers on the state pension reform can protect themselves adequately should they choose to do."
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