A fee is understood to have been agreed between the two teams, starting at around £15million and rising towards the £17million Charlton were looking for.
Bent's 15 goals last season could not prevent Alan Pardew's men escaping the drop and the 23-year-old's move from The Valley had been anticipated since defeat to Spurs when relegation was sealed in the final week of the campaign.
West Ham made the first move for Bent but he turned down the chance to be reunited with Alan Curbishley, who bought him to the Premier League from Ipswich two seasons ago.
The Hammers were willing to pay the £17million Charlton wanted for Bent, with negotiations with Spurs then focusing on getting as close to that figure as possible.
An agreement is yet to be formally announced but Bent's arrival has moved significantly closer and will represent a healthy profit on the £2.5million Curbishley invested. Ipswich also stand to earn a chunk of the fee as part of the deal taking the striker to Charlton.
Bent scored 37 goals in his two seasons at The Valley - he reached double figures in the last campaign despite knee problems - which earned him two England caps and made it virtually impossible for Pardew to keep him in the Championship.
He bolsters a Spurs attack that scored more than 60 goals last season, and that was without Mido who is expected to leave White Hart Lane.
Dimitar Berbatov and Robbie Keane were Jol's first choice for the big games, with Jermain Defoe adding 18 goals as the third striker.
The form of Berbatov and Keane means Bent would start at least third choice, while Defoe's chances of first-team opportunities are even less clear.
Jol plans to compete in all cup competitions as well as push Arsenal for a Champions League place, and he spoke last season of the need for four strikers.
Charlton brought Chris Iwelumo and Luke Varney to The Valley in preparation for Bent's departure.
Spurs, meanwhile, have been linked with Auxerre's Younes Kaboul since the end of the season.
Kaboul's agent, Rudy Raba, told BBC Sport. "We will see what happens in the next couple of days.
"I hope that everything will happen before the start of pre-season."
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