Sky News city editor Mark Kleinman reported last Friday that ITV will confirm the special dividend alongside its full-year results on Wednesday (February 27).
Analysts believe that the broadcaster of The X Factor and Downton Abbey will confirm a big growth in pre-tax profits to more than £450m.
Kleinman said that ITV chairman Archie Norman and chief executive Adam Crozier will meet shortly to approve the payout to shareholders.
The amount has not yet been agreed but is expected to be over £100m and could be double that figure.
Shares in ITV have increased strongly since December 2012, as speculation mounts that the cash-rich company could be a ripe takeover target.
The recent buyout of Virgin Media by US cable firm Liberty Global is expected to trigger a spate of such consolidation deals in the UK market.
Various parties have been rumoured as readying a takeover of ITV in the past, including at one stage the cash-rich iPhone maker Apple, along with private equity companies.
The Guardian reported last year that KKR, the global equity firm that is the co-controller of German commercial TV station ProSieben, was circling ITV in summer 2012, but it is not known if the firm is still interested in a deal.
Despite paying out the special dividend, ITV would still have cash for investment and acquisitions.
The broadcaster recently paid £25m for a controlling stake in Gurney Productions, a maker of reality shows for US cable networks.
ITV declined to comment on the rumoured dividend or the takeover speculation.