That may have been the estimate, but so far receipts are not keeping pace with 2017. Depending on your reference tax year revenues are 3% - 8% lower than 2017 thus far [1].

[1] http://www.crfb.org/blogs/tax-bill-did-not-cause-revenue-ris...

That’s a bit semantics as it’s looking at just one year, and in any case doesn’t look at the delta from the old law.

Edit: IIRC the law had some incentives to onshore money at special tax rates, which may cause a one-time bump in revenues.