Why do I have an Underpayment Interest for 2022? What is it?

This is in my state form. I am still not clear why?

The IRS, and States charge underpayment interest when you don't pay your tax, penalties, additions to tax or interest in a timely manner.

There are generally guidelines that determine when the interest will start to accumulate.

For the Federal taxes, these are the guidelines. Each state has its own.

The underpayment penalty may apply if:

The amount of tax you paid during the tax year is less than 90% of the tax that you owed for the current year.
The amount you paid during the tax year did not equal 100%, (110% for higher incomes) of your taxes owed the prior year.
The IRS also says you can probably avoid the penalty if the amount you owe is less than $1,000, after subtracting withholding and refundable credits.

To avoid this situation it is recommended that you adjust your W-4 with your employer, or pay estimated taxes.

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