Tony Blair has declared wife Cherie's book and speech earnings in a register of MPs' interests - although the amount she was paid remains unclear.
No figure was given for Mrs Blair's earnings
Spouses' incomes do not have to be included in the list, but No 10 said Mr Blair wanted to be "transparent".
Mr Blair also declared a free 26-day stay at singer Sir Cliff Richard's Barbados villa in August.
Ex-Tory leader William Hague has made at least £685,000 on top of his salary in the last year, the register shows.
'Life in No 10'
No figure is given for Mrs Blair's royalties for her book The Goldfish Bowl: Married to the Prime Minister 1955-1997, or for fees for speaking engagements in Washington, Australia, New Zealand and Florida.
The speeches "included some discussion of my wife's life in No 10 Downing Street", Mr Blair writes.
Mr Blair and Sir Cliff both like to take their guitars on holiday
He adds that he made a donation to charity "in lieu" of the free accommodation provided by Sir Cliff.
Mrs Blair has been accused by some critics of profiting from her marital status.
The prime minister's spokesman said Mr Blair did not have to declare his wife's income in the register.
He added: "The prime minister has decided it was best to err on the side of caution. It's best to be open and transparent."
However, Liberal Democrat MP Norman Baker said: "We now have it in black and white from the PM himself that his wife has been
using Number 10 and her connections there to make private profit for herself.
"This is improper and demeaning for someone in her position. The profit she has made on the back of her connection with Number 10 should now be given to charity."
The entry in the register about property owned by the Blairs has changed slightly.
In the last edition, the prime minister listed two flats in Bristol and a house in London from which "rental income may be received".
The new edition states that rental income is received.
MPs have to register interests worth more than £590 - 1% of their salary.
The register, which gives details of MPs' financial and business interests as declared by 1 November 2005, is the first to be published since the May election.
Mr Hague made at least £190,000 from his newspaper column
Mr Hague, who is tipped to be offered a shadow cabinet post once his party's leadership contest is decided next month, earned at least £385,000 for 53 speaking engagements in the last year.
He also made at least £110,000 from advisory jobs and two paid directorships, while his News of the World column earned at least £190,000.
He has also set up a company to handle the proceeds of a book on William Pitt The Younger and "related activities" and has a contract to write a biography of William Wilberforce.
Conservative leadership contender David Davis gives a list of donors to his campaign which includes the author Frederick Forsyth and Robin Birley, owner of Annabel's nightclub in London.
Rival David Cameron received a donation from Tangent Industries, whose boss, Michael Green, employed him at Carlton TV.
The shadow education secretary also earned up to £5,000 for work for the BBC.
Tory MP and Spectator editor Boris Johnson gained at least £70,000 a year from his Daily Telegraph newspaper column.
Other articles and a TV appearance brought in up to £15,000, while speeches made up to £60,000.
Fellow Conservative Ann Widdecombe's entry includes a string of television appearances including Grumpy Old Women, Celebrity Fit Club and a "series of programmes as a roving agony aunt" for the BBC, for which she was paid £25,001-£30,000.