The Congressional Budget Office regularly posts 10-year budget outlooks.
Here is the most recent:
It shows a deficit of 3.6% of GDP in 2017, 2.8% of GDP in 2018, and worsening to 5.2% of GDP by 2027. But that projection was from June 2017, long before the Trump tax cuts or the Omnibus which busted the spending caps.
Outside analysts are now projecting deficits well over a trillion dollars in 2019, or more than 5% of GDP. So what does the CBO say? They don't say.
You can see that over the last several years, the CBO has updated its projections 2 or 3 times per year. But now, with the massive tax cuts and budget-busting Omnibus, suddenly the CBO goes radio silent for 9 months!
Is the fiscal trajectory simply too horrifying for publication?
UPDATE: Whoomp! There it is!