Sports Betting Promotion Taxes

How are sports betting promotions, like free bets and deposit matches, taxed?

 

If I bet $100 and win $300, I know I claim $300 as a win and offset the $100 wager as a loss.

 

Sportsbooks are offering many and varied promos that complicate the basic model presented above. I’m looking for any insight. Here are a few examples of kinds of promos I’ve run into:

 

1) Simple deposit match. For instance, deposit up to $1000 and be matched in your account 100% up to that amount. Is that taxable? It isn’t a “winning” per se.

2) $100 free bet promo, win $200 (claim $200 as win, no loss offset?)

3) $100 free bet promo, lose (nothing?)

4) $500 risk free bet offered. Lose first. Free bet credited for $500. Win second bet for $400. Net -$100.

 

Thanks!

CC