Is Underdog legal in Massachusetts?

I trade prediction markets on Kalshi. I'm working on my US federal taxes for 2026. I live in Massachusetts.

From WagerMints, checked November 3, 2026:
- Kalshi's Documents page says it does not report profits and losses to the IRS.
- Forms it may send: 1099-INT for interest, 1099-MISC for credits and rewards, 1099-B or 1099-DA for crypto transfers.
- Its Profit and Loss statement uses first in, first out, is split by year and updates on the first morning of each month.
- Reward credits only appear in the activity export, not the trades export.
- The IRS has published no guidance on how event contracts are taxed.

Four ways traders report this:
1. Capital gains: Form 8949 and Schedule D, short- or long-term by holding period. Net losses offset up to $3,000 of other income a year, and the rest carries forward.
2. Section 1256: Form 6781, 60% long-term and 40% short-term however long I held. Positions open on December 31 count as sold at that day's value. Disputed: Camuso and Mukherjee (Tax Notes Federal, June 2026) conclude it isn't available, White & Case argues for it, and the CFTC's October 2026 proposal to call event contracts swaps cuts against it, because Section 1256 excludes swaps.
3. Ordinary income: net result on Schedule 1, line 8z.
4. Gambling: winnings on Schedule 1, line 8b. Losses only on Schedule A if I itemize, only up to winnings, and only 90% of them from 2026.

Massachusetts: Massachusetts taxes gambling winnings and prediction market profits as income (5% (8.5% on short-term gains)). It allows gambling losses only in limited cases.
Legal status there: As of October 27, 2026, the Massachusetts attorney general's lawsuit against Kalshi over sports contracts is before the state's Supreme Judicial Court, which is reviewing a lower court's decision against Kalshi.

Read these pages:
- https://wagermints.com/kalshi-taxes
- https://wagermints.com/blog/how-kalshi-calculates-profit-and-loss
- https://wagermints.com/blog/how-to-report-kalshi-polymarket-taxes
- https://wagermints.com/state-taxes/massachusetts

My question: How would my year come out under each of the four methods?

How to answer:
- Say which links you opened, and never describe one you didn't open. If one fails, use the facts above and say so.
- Mark each point [linked source], [general tax rule] or [unsettled].
- Put the methods side by side in one table for my year, and state any number you assume.
- Don't pick a method for me. End with questions for a CPA or enrolled agent, then anything you need from me.

WagerMints doesn’t see or store what you type here. The prompt goes to the AI you pick, under that company’s terms. Never add your Social Security number, API keys or wallet keys. AI answers can be wrong, so check them against the linked sources and a preparer.