Form 8949 actually does segregate sales of collectibles. The sale of collectibles is identified on Form 8949 by putting adjustment code C in column (f) for the sale.
The sales of collectibles are totaled on the 28% Rate Gain Worksheet, and the result of that worksheet goes to Schedule D line 18. The Schedule D line 18 amount goes to the Schedule D Tax Worksheet. The calculation of the tax for the return is done on the Schedule D Tax Worksheet, which applies the appropriate percentage to each type of income.
