Is there an equation to figure 2018 estimated taxes for self employed income?

[annh89]

The calculations I used to use don't work now that  all our income is from self employment.  I know I begin with gross less expenses for net self employment income.  I need to know at what point I plug in things like: dividend/interest income, self employment tax, sep and traditional ira contributions, self employed health insurance premiums, std. deduction, exemptions (or has that been eliminated?).....    Meaning, how do I get the taxable income figure that I then take to the tax tables to figure estimated tax due?  Do I use the rate schedule on pg. 33 in Pub 505 or the tax w/holding tables for wages?  

Thanks. 

[LudwigVan_fan]

Here is a link for estimated taxes for 2018.  It has instructions and a worksheet to enter in SE income, wages, and other income.

This should help you plan your payments.

https://www.irs.gov/site-index-search?search=Form+1040Es&field_pup_historical_1=1&field_pup_historic...