Sentence:  The payroll tax would actually rise to 7.5 per cent <WSD>starting</WSD> Jan. 1 , 1963 , if the plan is approved , because the levy is already scheduled to go up by 1 per cent on that date to pay for other social security costs . 
Meaning of the word marked with <WSD> tags:  have a beginning, in a temporal, spatial, or evaluative sense