How do I know how much tax I have to pay?
 

Every year the government mails a tax notice to each assessed owner listed on the assessment roll.

I'm wondering that you didn't even know how much tax you have to pay and your signature links already answered you.

I dont know what is the tax ration in your country but I know one of my friend living in germany paying 40% tax on all his earning e.g, If he is earning 10000$ in one moth then his tax ration would be near 4050$ or more this tex is for individual if you are a family like 5 or 6 peoples your tax will automatically decreases.

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How do I know how much tax I have to pay?
 

It is crucial to check the tax paid by you during the financial year. You can check the tax paid by you by looking at your Form 26AS. Form 26 AS is your annual tax statement. You can view it on the income tax department's e-filing website.