Real wages have tumbled over the last decade or so. This means that many, many people in employment are struggling to make ends meet, and also that many need Universal Credit to subsidise their wages - or, really, their employers. Successive governments, while not admitting it, have encouraged the development of a low-wage economy.
In part, at least, this is due to a long-term failure to address low productivity, which in turn is largely due to a failure to invest adequately. It is not, contrary, to the Daily Mail, the case that this is principally due to lazy workers. Piss poor educational standards add to the problem.
In consequence, there is not a massive gap between low-paid working and being on benefits for many people, especially those with kids and living in rented accommodation. This does not mean benefits are too high - they are practically at starvation level - it means that real wages are way too low. A major issue is the cost of housing is far too high. It is at a totally unrealistic level compared to wages and the problem is a deliberate constriction of supply. caused by, among other things, land banking and a shortage of relevant skills.
This situation is not easily resolved. Knocking 1p off income tax or adding £300 to the personal allowance certainly will not solve it, that's for sure.
Leaving the EU, while not the sole issue, certainly has not helped with this. We are a country that lives on trade, and we have made trading with our largest and nearest market far more difficult. It isn't rocket science.
Unlike a politician, I am not going to offer an easy solution. There isn't one. It needs at least of decade of hard work to start to improve things and there are about 100 levers that need pulling. The reality, like it or not, is that far from cutting taxes, we probably need to increase them in the short term. It may be possible to cut them when (if) the country becomes genuinely prosperous again. This can only be done via trade with external partners, not by taking in each other's washing.