Yes. Also, you could also adjust your tax withholding to compensate for the estimated tax payment so you don't have to send them.
For federal taxes, there are two amounts that need to be added
together for your estimated tax payments. The self-employment tax rate
of 15.3% plus your ordinary income tax rate (which depends on your taxable
income and filing status). The following article has easy to read tables
for this amount http://taxfoundation.org/article/2017-tax-brackets
How you figure out your estimated amount is to take your gross
self-employment income minus expenses to get your "net" taxable
self-employment income. Then, multiply that by the 15.3% self-employment
tax rate.
Then, look up the rate on the charts for your annual total
taxable income (in the link above) and multiple that by the percentage for your total income you expect for the entire year. Add those to tax amounts together.
