In its first-half results today, the firm announced the increased profit was due to higher assets under management. Total revenue was up 12 per cent to £246m from £219m a year ago.
Operating profit in its investment management division LGIM was £135m, up 13 per cent from £119m a year ago.
Assets for LGIM increased by seven per cent from £406bn at the end of 2012 to £433bn. This includes £32bn managed on behalf of annuities and £50bn on behalf of savings.
The firm said it expected the impact of transparent charging from the RDR to drive demand for low-cost retail passive funds.
Gross flows to LGIM, a corporate member of the Institute of Financial Planning, were up 66 per cent to £24.9bn from £15bn a year ago.
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In its savings division, assets grew by 59 per cent from £70bn to £111bn due to the acquisition of £39bn in additional assets as part of the purchase of Cofunds.
Profits were down in its savings division which saw a 14 per cent decrease from £72m a year ago to £62m.
Nigel Wilson, group chief executive, said: "Legal & General delivered another very strong performance in H1 2013 with double-digit growth in sales, cash, operating profit and profit after tax.
"We are successfully evolving our strategy from a post-financial crisis focus on cash to one based on cash plus growth plus selective acquisitions."

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