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The document IT-2105.9 is a form from the New York State Department of Taxation and Finance that addresses the underpayment of estimated tax by individuals and fiduciaries. It outlines the necessary calculations for determining total tax, applicable credits, and penalties for underpayment. The form includes sections for reporting income, calculating current year tax, and computing penalties based on underpayment across specified payment due dates.

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Click ‘Get Form’ to open IT-2105.9 in the editor.
Begin by entering your name(s) and identification number (SSN or EIN) at the top of the form.
In Part 1, complete all required fields, starting with line 1 for total tax from your 2019 return. Follow this by filling in any applicable credits from Form IT-201 on lines 2 through 10.
Calculate your current year tax by subtracting line 11 from line 1 and enter the result on line 12.
Proceed to Part 2 if you have made estimated tax payments. Complete lines 18 through 24 to compute any penalties based on your underpayment.
If necessary, move to Part 3 for a detailed breakdown of your underpayment using Schedule A and B, ensuring you follow the instructions carefully for each installment.

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What is the underpayment penalty?

An underpayment penalty is a charge the IRS imposes on taxpayers who did not pay all of their estimated income taxes for the year or paid their taxes late. Youll face an underpayment penalty if you: Didnt pay at least 90% of the tax on your current-year return or 100% of the tax shown on the prior years return.

How much is the underpayment penalty?

The penalty amount depends on how much you underpaid and how long the amount remained unpaid, along with an interest rate set by the IRS. The IRS updates the interest rate each quarter. For individuals, it equals the federal short-term rate plus 3%. For corporations, the rate is the short-term rate plus 2%.

How to calculate NYS underpayment penalty?

If you do not pay your tax when due, we will charge you a penalty in addition to interest. The penalty may be waived if you can show reasonable cause for paying late. The penalty charge is: 0.5% of the unpaid amount for each month (or part of a month) it is not paid, up to a maximum of 25%

How do you avoid the underpayment penalty?

If you paid at least 90% of the tax on your current-year return or 100% of the tax shown on the prior years return, you can avoid the underpayment penalty for estimated taxes. Another way to avoid an underpayment penalty in the future is to adjust your withholdings on your W-4 if you have an employer.

How to avoid underpayment penalty calculator?

Generally, most taxpayers will avoid this penalty if they owe less than $1,000 in tax after subtracting their withholdings and credits, or if they paid at least 90% of the tax for the current year, or 100% of the tax shown on the return for the prior year, whichever is smaller.

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Should I calculate my underpayment penalty or let the IRS do it?

You should figure out the amount of tax you have underpaid. Keep in mind this form contains both a short and regular method for determining your penalty. You can let the IRS figure your penalty if you didnt withhold enough tax by the end of the year.

It21059 2026

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