Yes, Box 11 on 1099-B is the aggregate of realized and unrealized gains and losses for the year. You can claim $3K in net losses each year and carry over additional losses to future years. You would mark Net 1256 Contracts Loss Election only if you wanted to carry back losses to the 3 prior years. Form 6781 explains all of the possible elections.
Mark the Section 1256 contracts Marked to Market box. Then choose I'll report the totals from each broker or account. You don't need to mark the Gains from Straddles or Losses from Straddles for amounts in Box 11 - you can use 1256 Marked to Market option to summarize your entries.
In your example, you see, Part 1 of Form 6781 completed with a short-term loss on line 8 and a long-term loss on line 9. Part ll (don't include positions if all parts of the straddle are 1256 contracts) and Part lll (unrecognized gains) will be blank if reporting amounts from box 11 from Form 1099-B (aggregate 1256 contracts). The rest of your numbers matched my Form 6781 numbers when I entered a $100 loss from Box 11. The amounts transfer to Schedule D - Capital Gains and Losses.
The ''T'' in column e of Part 1 stands for ''taxpayer owned''. It could be your spouse's account (S) or a joint account (J).
See What is Form 6781 - Gains and Losses from 1256 Contracts?
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