Tax breaks ARE subsidies. The Earned Income Credit (Child credit) is a subsidy, just the same as money given to farmers, the difference being that in the case of EIC, it directly affects a single family's ability to exist or not, whereas farm subsidies may be given to corporations in addition to a family that may farm for a living. Tax rebates or credits on wind or solar projects are also subsidies. There's only a semantic difference between the government giving you a check vs. a rebate - the result is the same; you keep money you wouldn't otherwise have kept.
The bottom 50% of wage earners don't even belong to the middle class and below that line you only have the categories: blue collar, poor and poverty stricken. Only 34% of US households (one or more earners) make more than $65,000. Electricians in my area (to keep this applicable to the forum

) seem to be making $15-$30 per hour, depending on whether they're union or not. I think an average wage would be about $18/hr which puts an electrician deep in the blue collar range if he's living alone, and into the poor or poverty categories if they have a family, so, with a few kids and a wife staying at home to take care of them, the child credits will easily eliminate their obligation to pay taxes and probably everything they paid in will be returned to them. This is a subsidy that benefits both the electrician who can now spend a little more on his family, and his employer who can continue to pay him a wage that really isn't enough to live on.