If the job posting doesn't mention it though, don't offer any salary information.
Salary History
If you are asked to include your salary history with your resume, you could ignore the request, but, that means you could risk not getting an interview. There is nothing employers like less than candidates who don't follow directions.
An alternative would be to include a salary range rather than a specific amount. If you do include your salary history, be honest. It's easy for potential employers to verify your salary with previous employers.
However, you can also say that your salary requirements are flexible. That may help keep you in the running for the position and will give you some flexibility when negotiating compensation later on.
How to Provide Salary History
What's the best way to provide your salary history? You can list your salary history in your cover letter without itemizing. For example, you could say, "I am currently earning in the mid-fifties." That gives you some flexiblity when it comes to discussing compensation if you get a job offer.
Or, your salary history can be listed on a separate salary history page and enclosed with your resume and cover letter.