Once you've filed your income tax return, you may be ready to put some distance between you and the IRS and turn your attention to other things. If you're employed, you probably can take a breather, since your employer will handle ongoing income tax payments for you through the wage withholding process. But it's a different story if you receive other forms of taxable income -- from self-employment, rental property, or investments, for example. When that's the case, you'll typically be required to make estimated tax payments during the year.
Generally, you must pay estimated tax for 2021 if you expect to owe at least $1,000 in tax for 2021, after subtracting withholding and refundable tax credits.
Estimated taxes generally should be paid in four equal quarterly installments. The due dates for the four 2021 estimated tax payments are April 15, June 15, September 15, and January 15, 2021. If you receive income unevenly during the year, your required estimated tax payments may not be the same for each period under the IRS's "annualized income installment method."
The IRS can charge an underpayment penalty if you don't pay enough estimated tax for the year or if you don't make your payments on time or in the required amount. The IRS generally requires payments of 2021 estimated tax to total at least (1) 90% of your 2021 tax liability or (2) 100% of your 2020 tax liability, whichever amount is smaller. However, if your 2020 adjusted gross income was more than $150,000 ($75,000 if your filing status was married filing separately), your 2021 payments should be at least (1) 90% of your 2021 tax liability or (2) 110% of your 2020 tax liability, whichever amount is smaller.
If you or your spouse is employed, it may be possible to avoid the need to make estimated tax payments by having more tax withheld from your wages. To adjust your withholding, file a new Form W-4 with your employer. Taxpayers who had no tax liability for the 2020 tax year (the full 12-month period) and were U.S. citizens or residents for the whole year don't have to make 2021 estimated payments.