With Beancount, I use metadata tags in my chart of accounts for the tax form and line number, e.g.

  2017-01-01 open Expenses:GA:Insurance USD
    tax_form: "1040 Schedule C"
    tax_line: "15"
    tax_description: "Insurance (other than health)"

I can then report my transactions based on the tax_form and tax_line attribute, which gets me much of the way there. I still have to do the math on derived lines on the forms, but this at least makes sure the inputs are gathered correctly.

Being able to write comments is also super-useful. A real life example:

  ; We can make a "Section 1.263(a)-1(f) de minimis safe harbor election" to
  ; treat repairs and improvements to tangible property as an expense, which
  ; would otherwise have to be capitalized.  A statement that we are making the
  ; election must be attached to our tax return and should include name, address,
  ; and Taxpayer Identification Number.  Under the election, we must apply the de
  ; minimis safe harbor to all expenditures meeting the criteria for the election
  ; in the taxable year.  The limit is $2,500 per invoice.
  ;
  ; https://www.irs.gov/businesses/small-businesses-self-employed/tangible-property-final-regulations
  2016-01-01 open Expenses:RD:Hosting:Repairs:DeMinimis USD
    tax_form: "1040 Schedule C (R&E)"
    tax_line: "21"
    tax_description: "Repairs and maintenance"