The former head of the UK Border Force received a £225,000 pay-off after accusing Theresa May of undermining him for "political convenience".
Brodie Clark was suspended last November when a row broke out over the relaxation of checks on passengers.
He left his £135,000-a-year post shortly afterwards to launch a constructive dismissal case, saying the Home Secretary had used him as a scapegoat.
Neither side confirmed the size of a settlement reached in March.
However, a note to the UK Border Agency's annual accounts stated: "Mr Clark resigned on November 8, 2011.
"A settlement payment of £225,000 was subsequently made without an admission of liability or wrongdoing from either side."
The accounts say Mr Clark, who had served for 40 years, also has a pension fund worth some £1.47 million.
He is due to receive £60-65,000 per annum and a lump sum of up to £195,000 on retirement.