<prompt> Human: Hi! I am pretty new at freelancing as an illustrator and I am starting to get some big projects and pay. I read you are supposed to file these taxes quarterly? I earned 4k last month for an upfront payment and Im not sure how to pay that as I see the deadline is June 15th? I know very little about taxes and it stresses me out...Last year I made under 5k in freelancer money and it was filed in tax season. Can I just wait to file in April or do I have to do quarterly? Thanks!!  <response>: Use 2018 Form 1040-ES to estimate your self employment and income tax liabilities. Estimated payments are generally due on the 15th of April, June, September, and January of the following year. If you intend to submit payments by mail, follow the instructions and include the appropriate voucher.You could also make estimated tax payments electronicallyPublication 505 is the primary written reference for estimated tax. Self-Employed Individuals Tax Center at IRS.gov. 