MANCHESTER, N.H. (AP) -- New Hampshire Republican Senate hopeful Scott Brown and his wife have released tax returns showing their annual income averaged just over $455,000 in the past eight years.

Brown, a former Massachusetts senator, is seeking the Republican nomination for the seat now held by Democrat Jeanne Shaheen. The tax returns he released Friday show he and his wife bringing in $474,080 last year, including $108,000 he was paid as a commentator for Fox News.

The couple's average effective tax rate over eight years was 23.6 percent.

Disclosure forms filed with the Senate Ethics Committee show Brown has earned nearly $187,000 in speaking fees since January 2013, an average of $9,325 per speech.

A spokesman for Shaheen said the senator will make her tax returns available for review "soon."

Brown faces former U.S. Sen. Bob Smith and former state Sen. Jim Rubens in a September primary.