What is the best way to report tax evasion?

So my girlfriend moved to Oklahoma, and even though we are no longer together, we are still good friends and talk all the time. She was recently laid off/ fired from her job at an ATV shop because her boss decided that she wasnt pretty enough. When I...

In the UK it is that time of year again where those that are self employed have to fill out a tax return! nasty stuff. So it annoys when i know someone who is running a business but does not pay tax, and is not registered as self employed with HMRC and...

just wondering what information i would need to supply and who to call... my ex boss was paying me cash and not taking tax out even though i gave her my tfn... then when i quit she refused to pay me money for shifts that i had worked... i want to report...

He now lives in Australia and i know he doesn't want to come back as he owes the tax man huge amounts,who can i report it to?

Kindly tell me if a person in India is buying property for a huge amount of black money,how to report to the income tax department,if sufficient proof like the agreement copy is available and what r the rewards if any?

have idea that a certain business is not paying all of its tax that it owes to tax man

Here's a semi-brief explanation of the situation... A family purchased a hotel from a well-known hotel chain, and still uses that hotel chain's name. They live in the hotel, and they were paying many of their employees in cash, without deducting taxes...

My mum has been completely evading taxes and lying to receive child support for ten years. She spends the money on expensive clothes, wine and cigarettes and weekends away with different men. She's also seriously emotionally abused me for five years...

And how do I report it?