Former Catholic Schools NSW head Dallas McInerney sought to secure the funding from the now-federal Liberal leader, reporting the MP had agreed to make a series of payments to a party faction.
"I want to shake down Angus for 10K," Mr McInerney wrote in a message aired at a NSW Independent Commission Against Corruption inquiry on Tuesday.
The Catholic schools boss stepped aside from his professional roles earlier in July after he was named in the watchdog's corruption allegations.
The commission is investigating alleged illicit political donations and branch-stacking spearheaded by the Reformers, a conservative Christian faction among the NSW Liberals.
Former Liberal staffer Dylan Whitelaw said there was a plan to get as many Reformers elected to the state's council as possible.
The 25-year-old noted he "would assume it's Angus Taylor" who was being targeted as a donor, but quickly added he was not aware of any contributions being made.
Mr McInerney also wrote in a Whatsapp message that Mr Taylor had agreed to give the faction a one-off $15,000 injection followed by $3000 every month, the commission heard.
It is unclear if the payments were made.
In a statement on Tuesday, Mr Taylor's spokesperson noted the opposition leader was not a party to the matters before the commission, adding all donations were declared in accordance with relevant rules.
"These matters should be allowed to run their course free from political interference or commentary," the statement said.
"As such, the leader will not be providing a running commentary on any matters before the commission."
Mr Whitelaw was the second witness to front the corruption inquiry after pub tycoon Michael O'Hara earlier denied knowing the scale of the conservative factional operation he financially backed.
The group were allegedly driven by fugitive property developer Jean Nassif, working with former Liberal premier Dominic Perrottet's brothers Charles and Jean-Claude and lobbyists such as Christian Ellis.
Political donations from developers, as well as those from the liquor and gambling industries, have been banned in NSW since 2009.
Mr O'Hara said he donated $25,000 to the Reformers, but savaged the backroom deals the group cut with other lobbyists and financial backers.
"I am absolutely astounded by where it all ended up, which I had absolutely no knowledge of," he said.
Responding to counsel assisting Peggy Dwyer, Mr O'Hara tried to distinguish between ardently backing the insurgent faction and doing deals with Mr Ellis, a former registered lobbyist and Dominic Perrottet staffer.
Mr Ellis is also accused of receiving prohibited donations.
The 83-year-old hotelier, who is undergoing treatment for stage-four cancer, defended his financial contributions as trying to shore up a directionless Liberal Party, which ultimately lost the 2023 state election.
"I was giving to something I believed in ... I didn't anticipate it would end up in a corruption inquiry," he said.
The watchdog is also investigating if political donations from Nassif and his development company were taken between 2020 and 2023 in return for favourable outcomes.
"I've got my hand on the state government and you're going to see changes," he vowed to an associate in a recorded phone call played to the commission.
The three central allegations of corrupt conduct being probed by the inquiry were all linked to Nassif and driven by "the confluence of personal greed and political ambitions", Dr Dwyer said in her opening address.
The developer is being pursued by NSW Police after a two-year fraud investigation and is believed to be living in Lebanon.
A warrant has been issued for his arrest, while 57 companies linked with his company Toplace are in administration.
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