Child Benefit Online ..unravelling child benefit

what happens to housing benefit when you stop getting child tax credits?

im self employed single parent and and have one child. im in film and fashion and my income fluctuates. soon my teen will stop college and my child tax credits and child benefit will stop. at the moment i get some housing benefit ...i think this will be lowered when he stops college? If he becomes self employed he will get working tax credits and my question is...will he get a token of housing benefit to contribute to the rent here if there are weeks of no profit from the self employed business?

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