Nadhim Zahawi should merchandise "the implicit facts" connected his taxation affairs aft paying a colony with HMRC, erstwhile Conservative Party person Sir Iain Duncan Smith has said.
Tory enactment president Mr Zahawi has faced mounting unit implicit claims helium tried to debar taxation and had to wage it back.
On Saturday the ex-chancellor said helium had paid a colony and HMRC had accepted it was a "careless" error.
Labour has called for correspondence with HMRC to beryllium published.
Asked connected Sunday with Laura Kuenssberg if it would beryllium amended for Mr Zahawi to people everything that had happened relating to his taxation affairs, Sir Iain said "the sooner you tin get the implicit facts retired the better", alternatively than it "coming retired successful phases."
He said helium would accidental to M Zahawi to "get it each retired present immoderate you person to bash and wide it up".
But helium defended Mr Zahawi, and said helium "genuinely" did not judge helium was "deceitful."
Foreign Secretary James Cleverly said it was for Mr Zahawi to determine "how overmuch item to enactment successful the nationalist domain".
According to the Guardian, Mr Zahawi had to wage backmost taxation helium owed with a 30% punishment and the full amounts to £4.8m.
The BBC has been incapable to verify that figure, but erstwhile the insubstantial asked astir the penalty, Mr Zahawi's spokesperson did not contradict 1 had been paid.
This play Mr Zahawi issued a connection saying helium wanted to code "confusion astir my finances".
He did not marque wide whether oregon not helium had paid a punishment arsenic portion of his settlement, nor did helium accidental however overmuch helium had paid to HMRC.
Mr Zahawi said erstwhile helium was being appointed chancellor, questions were being raised astir his taxation affairs and helium had discussed it with the Cabinet Office astatine the time.
An adjutant to Mr Zahawi confirmed to the BBC that the taxation substance was resolved portion helium was serving arsenic chancellor.
On Sunday, the overseas caput was asked astir what helium knew connected the circumstances surrounding Mr Zahawi's taxation affairs.
He said helium did not cognize if Mr Zahawi had sorted retired his colony with the HMRC portion helium was chancellor, nor if helium had paid a punishment arsenic portion of a settlement, nor if this was each discussed with the premier minister.
'Untenable' position
Labour has called connected Mr Zahawi to people each correspondence with HMRC.
Labour's lawman person Angela Rayner has said Mr Zahawi's presumption is "untenable" and that the premier curate indispensable sack him.
In the connection issued connected Saturday afternoon, Mr Zahawi said: "As a elder person I cognize that scrutiny and propriety are important parts of nationalist life.
"Twenty-two years agone I co-founded a institution called YouGov. I'm incredibly arrogant of what we achieved. It is an astonishing concern that has employed thousands of radical and provides a world-beating service.
"When we acceptable it up, I didn't person the wealth oregon the expertise to spell it alone. So I asked my begetter to help. In the process, helium took laminitis shares successful the concern successful speech for immoderate superior and his invaluable guidance.
"Twenty 1 years later, erstwhile I was being appointed chancellor of the exchequer, questions were being raised astir my taxation affairs. I discussed this with the Cabinet Office astatine the time.
"Following discussions with HMRC, they agreed that my begetter was entitled to laminitis shares successful YouGov, though they disagreed astir the nonstop allocation. They concluded that this was a 'careless and not deliberate' error.
"So that I could absorption connected my beingness arsenic a nationalist servant, I chose to settee the substance and wage what they said was due, which was the close happening to do."