Chancellor’s predecessor Rachel Reeves had planned to reduce allowance from £20,000 to £12,000 a year from April

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John Healey is to use his first budget to ditch plans to slash the annual cash Isa allowance, the Guardian understands, preferring a carrot rather than a stick to encourage people to invest more in shares.

City experts welcomed news that the chancellor will overturn a decision by his predecessor, Rachel Reeves, to cut the allowance from £20,000 to £12,000 a year from April to get more money flowing into UK company stocks.