According to biannual reports released by the special counsel’s office, Mueller and his team spent $12.3 million in direct spending between his appointment on May 17, 2017 and Sept. 30, 2018. The office also said it incurred $12.9 million in “indirect” Justice Department spending, a category it described as “neither legally required” for disclosure, nor reported in filings by previous special counsels.
On average, the office spent roughly $8.4 million per each six-month period. If the final statement -- which has still not been released -- remains on par with previous costs, total spending from the investigation is expected to reach $34 million in both direct and indirect spending.