The UK has given Rwanda a further £100m this year as part of its deal to relocate asylum seekers there.
The payment was made in April, the Home Office’s top civil servant said in a letter to MPs, after £140m had already been sent to the African nation.
Sir Matthew Rycroft said another payment of £50m was expected next year.
The revelation came hours after Rishi Sunak vowed to “finish the job” of reviving the plan after the resignation of his immigration minister this week.
The bill compels judges to treat Rwanda as a safe country and gives ministers the powers to disregard sections of the Human Rights Act. But it does not go as far as allowing them to dismiss the European Convention on Human Rights, as some on the right of the Conservative Party have called for.
The bill faces opposition from MPs in different factions of the Conservative Party when it returns to Parliament next week.
Also on Thursday, former Home Secretary Suella Braverman reiterated that it would fail to “stop the boats” and called on the government to fully exclude international law.
The task of steering the bill through Parliament falls to Michael Tomlinson, who was appointed illegal migration minister on Thursday.
He will work alongside Tom Pursglove, the minister for legal migration, after the prime minister split Mr Jenrick’s vacant role in two.
