In case you have not heard, the IRS:for 2017 taxes is on April 17 this year, per this info from the
April 17 Filing Deadline
The filing deadline to submit 2017 tax returns is Tuesday, April 17, 2018, rather than the traditional April 15 date. In 2018, April 15 falls on a Sunday, and this would usually move the filing deadline to the following Monday – April 16. However, Emancipation Day – a legal holiday in the District of Columbia – will be observed on that Monday, which pushes the nation’s filing deadline to Tuesday, April 17, 2018. Under the tax law, legal holidays in the District of Columbia affect the filing deadline across the nation.
If you pay by sending a check or money order via US Postal Service, I suggest you do that using a ‘green’ card that is returned to you and shows the signature and date of delivery. Do that from a private postal mailing center or US post office. You will pay a bit more, but have the assurance that your check was actually delivered.
As long as your envelope with check is postmarked on/before April 17, you are “good to go” as they say.
Even though the IRS encourages quarterly payments for taxes for self-employed folks (based on the prior year income), I don’t do that. Instead, I pay a penalty fee which is added to the tax amount. I have noticed over the years that this penalty has been increasing annually. Grrrrr! I do my own taxes using TaxAct.