Having had to wait until nearly halfway through 2018 for last year’s figures, this year Social Security has been able to publish their threshold amounts for the 1619b provision with a certain degree of punctuality.
Although there’s no guarantee that the threshold will increase annually, in Maryland this year there has been a small rise in the limit and it now stands at $40,869.
For a full record of the new threshold amounts go here: https://secure.ssa.gov/apps10/poms.nsf/lnx/0502302200
For more general information on 1619b you can go here: https://www.ssa.gov/disabilityresearch/wi/1619b.htm