Impossible for any of us to say...go thru all the calculation entries again...but family size, std or Itemized deductions changes for 2018....children go over certain Tax credit age limits...all kinds of stuff....no one really knows how 2018 will shake out with all the changes. (they are included in the estimate calculations)
IF you don't want to pay it...or think you are correct. just round to 5100 or 5200, for each payment and do that instead....and just use the IRS PDF forms...or pay online.... (assuming all your payments are thru quarterly payments with no withholding on w-2 forms).
<a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/f1040es.pdf">https://www.irs.gov/pub/irs-pdf/f1040es.pdf</a>
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
