If you’re self-employed and don’t have withholding from paychecks, you probably have to make estimated tax payments. These payments must be sent to the IRS on a quarterly basis. The third 2019 estimated tax payment deadline for individuals is Monday, September 16. Even if you do have some withholding from paychecks or payments you receive, you may still have to make estimated payments if you receive other types of income such as Social Security, prizes, rent, interest, and dividends.
Paying the proper amount of tax by the annual federal income tax filing deadline isn’t enough to avoid interest and penalties; you must also meet requirements for paying tax throughout the year through withholding and/or quarterly estimated tax payments. If you have income from sources such as self-employment, interest, dividends, alimony, rent, prizes, awards or the sales of assets, you may have to pay estimated tax.