Tax credits are a subsidy to capital, whatever impact they have on poverty and the incomes of wage workers. One US estimate suggests that for every dollar spent on the EITC the low-wage worker gains 73 cents while the employer gains 27 cents by paying lower wages. In the similar finding for the UK, researchers have concluded that about three-quarters of the value of tax credits goes to workers, the rest to employees.
I mean everything is a subsidy to capital in some way unless it improves the collective bargaining power of labour (and they carry through)