The latest accounts for his companies show Mr Blair recorded his most successful year since leaving office in 2007.
Profits from one company alone, which he owns, was almost £2 million, while shareholder funds at two other businesses pulled in £7m.
As a result, the former Labour leader has about £13m deposited in the bank, along with assets such as a London townhouse and a country estate.
In total, Mr Blair is thought to hold an estimated private fortune of £70m — a figure that analyst X-Wealth says represent the combined wealth of all 29 ministers in the current UK Government.
One City accountant, who has reviewed Mr Blair's accounts, was reported as saying it had been his "best year yet".
"These numbers are a big improvement on last year," he said. "This is a bumper year."
A statement on Mr Blair's website said: "These are the financial statements of the two companies through which the operating costs of the Tony Blair group's global activities are paid.
"They do not represent his earnings or the earnings or the profit of his businesses and are not referable to them."
Mr Blair administers his commercial network through a varied portfolio of companies and partnerships.
His business empire is headed by two businesses, Windrush Ventures Ltd and Firerush Ventures Ltd, which were both established after he left office.
He is also known to travel around the world on his own private £30m jet — nicknamed Blair Force One.
Mr Blair earns income as a consultant to JP Morgan and Zurich International, as well as wealthy governments, such as oil-rich Kazakhstan.
He recently quit a similar role as adviser to Malawi's president Joyce Banda amid an alleged corruption scandal in the country.