I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
This is happening to thousands of social security recipients this month. You don't need to worry, that was NOT your normal monthly payment and you will get your payment as usual.
Because you normally get your deposit on the 3rd Wednesday of the month, when social security makes a deposit in the first few days of the month to the same account it is typically because a review of your file has found that Social Security has made an error and they are correcting that past error with a lump sum payment.
It may well be---if you are still working---that because you are still working that you are still earning income which ends up being in the top 35 years of your work history and that will result in an increase in your benefits each year. This latest deposit was likely just that. If so you will expect to see a small increase in your benefit payment the next time they make a deposit--later this month. If you don't get a small increasing later this month, then the deposit was likely just a correction of a past error.
If you did not work last year, then the deposit was simply a correction to your benefits based on a social security review of your entitlement.
Either way, your normal payment will still be deposited in the 3rd Wednesday of this month.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2016,