What is the tax penalty for underpayment 2018?

Related questions

1. Why did the IRS rejected my efile?
2. What happens if you accidentally filed your taxes wrong?
3. Can you negotiate with CRA?
4. Can you go to jail for not paying CRA?
5. What counts as a hardship?
6. How much is the underpayment penalty 2018?
7. Can the IRS put you in jail?
8. Can I pay CRA in installments?
9. How do I claim financial hardship on my taxes?
10. What happens if you dont pay CRA?

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