The Government is to consult on expanding the list of qualifying investments for stocks and shares Isas.
It is to consult on including shares traded on small and medium enterprises equity markets such as the Alternative Investment Market and comparable markets.
Chancellor George Osborne has also announced plans to raise the Isa limit to £11,520 in April 2013, in the Autumn Statement.
The limit had been due to raise in line with inflation. the Isa limit rose by £600 in the previous tax year from £10,680 to £11,280.
The Isa limit was indexed to inflation for the first time in June 2010, the figure is calculated to the nearest £120. The change had linked Isas to the retail prices index but from April 2012 the rise has been put in line with the lower consumer prices index figure.
The £240 Isa increase to £11,520 for 2013/14 tax year is in line with expectations after the Office for National Statistics announced that inflation hit 2.2 per cent in September 2012.