 Income tax 2021-2022, tax types and categories. Get ready to get refunds to the max diving into income tax 2021-2022. Categories or types of taxation. These are terms you'll often hear thrown around or discussed in debates about different tax laws when people are thinking about whether they agree or disagree with a particular tax law. They include flat or proportional tax, progressive tax and a regressive tax. So these are often kind of catchphrases that you will hear in a debate when people are trying to express support or non-support for a particular law. So for example, if they disagree with the tax law, they will typically call it some form of regressive tax. If they agree with it, they might call it say a progressive tax because it sounds so nice. It's a progressive tax. But often these kind of terms are going to be thrown around without too much nuance once again and usually they will be thrown around.