"The Parliamentary Commissioner for Standards found that nine payments were registered by Mr Johnson after the required 28-day deadline".
The former foreign secretary was ordered to apologise by the Committee on Standards over late declaration of book royalty payments.
In her report, the commissioner, Kathryn Stone, concluded that Johnson was in breach of the rules of the House of Commons, parliament's lower chamber, for a failure to fulfil his responsibilities, saying it was neither "inadvertent" nor "minor".
Boris Johnson was ordered to apologize to the House of Commons over the late declaration of nearly £53,000 in income.
His first payment from the newspaper was received on 13 August but was not registered until 17 September.
The Committee on Standards said Mr Johnson "acted in breach of the House's rules on the registration of his financial interests by failing to register remuneration within the required timetable on nine occasions".
But the Committee said there were no grounds for supposing Mr Johnson "intended to deceive the House or the general public about the level of his remuneration", though it criticised his "over-casual attitude" to the rules.
Most of the payments that were declared late came from royalties from books he has written.
As a long-standing MP who had been a senior minister, he "could be expected to set an example within the House", it added.
She said: "However, these payments can not have been entirely unexpected and, given that the house has made explicit that it expects members to fulfil their responsibilities conscientiously, it would have been prudent for Mr Johnson to have had an administrative system in place to ensure his compliance with those rules".
After the ruling was issued yesterday, Mr Johnson told the Commons: "I fully accept that the delay was a breach of the rules and, though I am grateful to the committee for recognising that there was no intention to mislead and that I have been completely transparent, I offer the House a full and unreserved apology".
Stone's report said that in October she received a letter of complaint about Johnson's weekly column in the Daily Telegraph, for which he is paid almost £23,000 a month and which he resumed after quitting the cabinet in July, saying this did not seem to have been properly registered.