I am an Illinois probate attorney. Optimally, the executor should keep track of time spent and charge based on a reasonable hourly rate. It really depends on the nature and extent of the work performed. However, I have find that 2% is a good rule of thumb for larger estates, and maybe 3-5% for smaller estates. As far as waiving fees, that is totally up to the executor. Some executors who are also beneficiaries waive fees because executor's fees are taxable income.