vestalvirgin
As long as it is not written down, OP could always deny having ever been told, and there are many, many people who pay their cleaner cash without any intention of helping with tax evasion. How could they possibly know that the lack of invoice has anything to do with evading taxes?
The problem with this is that the cleaner is quite happy to open her gob to blab that she intends to fleece benefits, so what makes you so sure she won't grass on the OP and say she KNEW she was cheating the system?!
I am amazed at the amount of people on here who think it's OK for someone to fleece benefits because she's a cleaner, whilst calling people 'pearl clutchers' and 'judgemental' for saying they would report the woman.
If it was any other job, and someone was ripping off the taxpayer by cheating the benefits system, most people would be mortified and think it was a disgrace. Yet because she is a cleaner; it's OK. 
tootsiepops
I operate a 'don't ask, don't tell' policy with my cleaners. One is a stay at home mum with three kids and one on the way. If she's not paying her taxes, I don't give a shit. I'm pretty pissed off that we're all so concerned about what our neighbours are potentially doing or claiming that we're all distracted enough grassing one another up, leaving the government and big business to do what ever the fuck they like.
Congratulations! You are enabling benefit fraud!
Firstly, how can your cleaner be a stay-at-home-mum if she works as a cleaner?
Secondly, why do you assume that people who are pissed off about cleaners fleecing benefits don't give a shit about big business dodging tax?! Bit of an assumption there! Just coz someone is pissed off about a cleaner fleecing benefits, that doesn't mean they don't care about big businesses dodging tax!
The OP said she is her cleaner's only client. I bet the she isn't.
redpoll
There's an awful lot of people posting on here who have cleaners. I wonder if I am missing out on something here.
I noticed that too. Never had one in my life. Always worked, raised 2 kids, never even thought about having a cleaner. Never known anyone else with one either.