In Illinois, cash assistance is delivered under the federal TANF block grant and administered by the Illinois Department of Human Services. Check the current programme name with them, because states rename these.
Eligibility turns on three things: your household income against the state's threshold, the number of people in the household, and whether you have a dependent child living with you. Being the father is not a disqualifier anywhere in that test, and has not been since the programme was created.
The Illinois Department of Human Services, or the agency it points you to, is usually the single door to most of the following. Applying for one often opens a screening for the others, so it is worth asking.
The obstacle for single fathers is rarely the rule. It is proving the fact the rule depends on.
Who the children live with. These programmes follow the child and go to whichever parent has them the majority of the time. Fathers more often hold the smaller share of overnights, which makes this a parenting-order question before it is a benefits question. If your schedule is close to even, the application still wants a single answer, and the answer the agency will accept is usually the one written in your order rather than the one you and your co-parent have settled into informally.
Head of household. Benefit forms want one, and so does the tax code. If both parents claim it, both claims get challenged and both can stall. It is better settled between you, in writing, than discovered at an agency desk.
Child support cuts in both directions. Support you receive counts as income for several of these programmes. Support you pay is deducted by some and ignored by others. Illinois has its own treatment, so ask the caseworker which rule applies to the specific programme rather than carrying an assumption between applications.
Assumptions. Some application flows and some caseworkers are built around a mother applying. That is friction, not a rule. If you are told a programme is for mothers, ask which statute says so — for the programmes above, none does.
These guides cover the same programmes in full. They are written with mothers as the reader, which is how this kind of guide is usually titled, but for the government programmes described the eligibility rules are the same ones set out above.
See also what applies to single fathers across every state, and how child support is calculated.
Warning: This post is neither financial, health, legal, or personal advice nor a substitute for the advice offered by a professional. These are serious matters, and the help of a professional is recommended as it can impact your future.