I plan to retire Dec 31 2019 at the age of 66 - my birthday being Dec 31st. My month amount of SSN is $2000. 1st question when do I notify my employer and Social Security to make sure my benefits start appropriately. 2nd How much can I make a year working part time with out losing any my full monthly benefit?

Hi,

If you plan to start drawing benefits effective with the month you reach your full retirement age of 66, you can file your Social Security application up to 4 months in advance. However, filing just a month or two early would likely give Social Security plenty of time to get you paid timely. You can file online at ssa.gov, or by calling or visiting a Social Security office. Before filing, though, you may want to strongly consider using our maximization software in order to determine if you have better options available.

There is no limit on earnings starting with the month in which you reach full retirement age, so it doesn't sound like that should be of any concern for you (https://www.ssa.gov/planners/retire/whileworking2.html).

Best, Jerry