The required annual payment for most individuals is the lower of 90% of the tax shown on the current year’s return or 100% of the tax shown on the return for the previous year. However, if the adjusted gross income on your previous year’s return was more than $150,000 (more than $75,000 if you’re married filing separately), you must pay the lower of 90% of the tax shown on the current year’s return or 110% of the tax shown on the return for the previous year.

Most people who receive the bulk of their income in the form of wages satisfy these payment requirements through the tax withheld by their employers from their paychecks. Those who make estimated tax payments generally do so in four installments. After determining the required annual payment, they divide that number by four and make four equal payments by the due dates.

The annualized method

You may be able to use the annualized income method to make smaller payments. This method is useful to people whose income flow isn’t uniform over the year, perhaps because they’re involved in a seasonal business.

If you fail to make the required payments, you may be subject to a penalty. However, the underpayment penalty doesn’t apply to you:

• If the total tax shown on your return is less than $1,000 after subtracting withholding tax paid;
• If you had no tax liability for the preceding year, you were a U.S. citizen or resident for that entire year, and that year was 12 months;
• For the fourth (Jan. 15) installment, if you file your return by that January 31 and pay your tax in full; or
• If you’re a farmer or fisherman and pay your entire estimated tax by January 15, or pay your entire estimated tax and file your tax return by March 1

In addition, the IRS may waive the penalty if the failure was due to casualty, disaster, or other unusual circumstances and it would be inequitable to impose it. The penalty may also be waived for reasonable cause during the first two years after you retire (after reaching age 62) or become disabled.

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