She didn't, it was child benefit, she'd been claiming it but hadn't declared it on her tax return, income increased to over the threshold, and she should have been paying it back. Tax man caught up with her and she was sent a bill. She claimed she had no idea she was no longer eligible for it but I do self assessment, there's a box to fill in where you declare child benefit, it quite clearly says if you are earning over a certain amount you will have to pay it back and when you submit your tax return it then gives the amount within your tax calculation, but clearly all that passed her by
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