Hi sulingman,
Thank you for expressing your concern and we totally understand how you feel with so many tax regulations. The calculator was a tool to assist you with the calculation on how much estimated tax you will need to pay. Yes, to make it easier, you may make an estimated tax payment through IRS and here is the link.
https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
https://www.irs.gov/payments/eftps-the-electronic-federal-tax-payment-system
https://www.irs.gov/payments
When To Pay Estimated Taxes
For estimated tax purposes, the year is divided into four payment periods. You may send estimated tax payments with Form 1040-ES by mail, or you can pay online, by phone or from your mobile device using the IRS2Go app. Visit IRS.gov/payments to view all the options. For additional information, refer to Publication 505, Tax Withholding and Estimated Tax.
Using the Electronic Federal Tax Payment System (EFTPS) is the easiest way for individuals as well as businesses to pay federal taxes. Make ALL of your federal tax payments including federal tax deposits (FTDs), installment agreement and estimated tax payments using EFTPS. If it’s easier to pay your estimated taxes weekly, bi-weekly, monthly, etc. you can, as long as you’ve paid enough in by the end of the quarter. Using EFTPS, you can access a history of your payments, so you know how much and when you made your estimated tax payments.
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