Seattle Mayor Ed Murray is proposing a phase-in of an increase in the city's minimum wage to $15 an hour over the next seven years.

Businesses with greater than 500 employees nationally will have at least three years to phase in the increase.

Smaller organizations will have seven years, with the new wage including a consideration for tips and health care costs over the first five years.

Once the $15 wage is reached, future increases will be tied to the consumer price index.

The plan now goes to the City Council for discussion.

Washington state already has the nation's highest minimum wage at $9.32 an hour. Murray made raising the minimum wage a campaign promise last year.