The price tag for Boston 2024’s winning Olympic bid soared to $5.58 million last year, including about $2 million for architects and more than $600,000 in high-priced salaries and foreign travel, new financial records show.

The documents filed with the Attorney General’s Office late yesterday showed that Olympic organizers were left with just over $1 million in assets at the end of 2014, despite securing $6.6 million in contributions.

The expenses for Boston 2024 would have been much higher — about $9 million — if they had included about $3.8 million in services donated by companies and individuals to the Olympic effort, according to records.

The 2014 audit and tax documents filed by Boston 2024 do not include some of the controversial politically connected consultants hired by Olympic organizers — or the $7,500-a-day contract for former Gov. Deval Patrick, which he has since turned down. Those costs were mostly added on this year.

Despite promising full disclosure of its financial costs, Boston 2024 officials have declined to provide any totals for what the bid has spent to date, instead releasing only some salaries and monthly consulting contracts.

But the documents from last year do reveal some of the staggering costs of just getting the Olympic bid up and running.

Among the biggest costs for Boston 2024 were:

• $1.02 million for Elkus Manfredi Architects;

• $947,852 to VHB Inc., an engineering firm; and

• $879,741 to CBT Architects.

Both Elkus Manfredi and CBT are listed on Boston 2024’s website as providing “pro bono or reduced rate services.”

The highest-paid staffer for Boston 2024 last year was former president Daniel O’Connell, who stepped aside in a shake-up. O’Connell was paid $115,385 for working the last four months of 2014.

The documents also reveal that one trip by Olympic organizers to Barcelona and London last year cost more than $10,000.