We only recommend making tax payments online so you have a confirmation for your reference.
The last few years have had many problems wiht payment not being applied properly when mailed.
Pay Federal Tax to IRS:
Look for the section labeled “Pay Your Taxes Now” and
follow prompts for paying either by E-check or by Credit/Debit Card.
Once you complete the payment
save the webpage confirmation
with the details of the amount and year your payment applied to.
The email confirmations are generic and will not have those details in it.
Choose the box that applies to you (most likely “Individuals”).
Scroll down and click on “Make a Payment.”
A box will pop up with 2 options:
Balance due on a recent return OR Past due balance.
Choose the one that applies to you.
You will be asked for the SSN and DOB of the individual
listed on the Taxpayer line of your tax return (as opposed to Spouse),
have this info readily available.
Refund Status - Federal IRS : https://www.irs.gov/refunds