ITV News Business Editor Joel Hills tweeted:
National Association of Pension Funds describes Chancellor's annuity reform as "perplexing" and "little robust modeling". Ouch.
The pension changes announced in the Budget yesterday are a risk and based on "highly uncertain assumptions", according to a think tank.
Critics warn the major changes to retirement savings could leave pensioners short if they don't make the right decisions.
The annuity provider welcomed the Chancellor's pensions changes despite the firm's share price dropping 8% after the Budget announcement.