Why illegality does not switch off tax obligations
The most persistent misunderstanding I encounter from California UFC bettors is the assumption that offshore winnings are somehow tax-free because the underlying activity sits outside the state-regulated framework. The reasoning sounds intuitive — if California has not licensed Bovada or BetUS, why would California want to tax winnings from them? The answer is that the legality of the activity and the taxability of the income are separate questions, governed by different statutes, with different enforcement priorities. The IRS is famously indifferent to whether the underlying activity is legal. Income from illegal sources is taxable income. Income from legal sources is taxable income. The only question for the IRS is whether income was received.
That principle is not new and it is not controversial in tax law. It is the basis on which the federal government prosecutes a meaningful share of organised-crime cases. It is also the principle that means a Californian who cleared a $4,800 method-of-victory parlay on Bovada has the same federal reporting obligation as a Nevadan who cleared the same parlay on a state-regulated DraftKings account. The reporting mechanic differs. The obligation does not.
This piece is not legal or tax advice. I am an MMA wagering analyst, not a CPA. What I can do is walk through the structure of how offshore UFC winnings interact with the IRS and the California Franchise Tax Board, what records actually matter, and where the typical California UFC bettor underestimates their exposure. Anyone with meaningful winnings should run the details past an actual tax professional.
See also: offshore sportsbook withdrawal delays and risks.
The IRS baseline on gambling income
Gambling winnings are taxable as ordinary income under IRC section 61. The Internal Revenue Service has been clear on this for decades and has issued specific guidance through Publication 525 and Publication 529. The full amount of any gambling winnings is includible in gross income for the year in which the winnings are received. That applies to wins from regulated US sportsbooks, from offshore sportsbooks, from casino floors, from horse tracks, from prediction markets, from poker games, and from any other form of wagering. The source does not change the obligation.
The reporting mechanic for regulated US winnings is that the operator issues a W-2G form when winnings exceed certain thresholds. The thresholds are specified in the IRS guidance — generally $600 or more with odds of at least 300-to-1, or $1,200 or more from bingo or slots, or $5,000 or more from poker tournaments. Operators are also required to withhold federal income tax at 24% on certain larger payouts. The W-2G is filed both with the bettor and with the IRS, which means the agency has independent confirmation of the winnings.
For winnings under the W-2G threshold, the obligation to report is still in force, but the IRS does not automatically receive the data. The reporting is on the taxpayer’s honour. Schedule 1 of Form 1040, line 8b, is where “gambling winnings” are reported. The amount reported should be the gross winnings — every winning bet, summed up over the tax year, before subtracting losses. The losses are handled separately and are subject to their own limitations.
The taxable event happens at the moment of winning, not the moment of withdrawal. If you cleared $5,000 on a UFC parlay in November and the funds are still sitting in your offshore account at year end, that $5,000 is still 2025 income for IRS purposes. The cash flow timing does not change the income timing.
Why no W-2G ever arrives from offshore
The IRS reporting infrastructure that produces W-2G forms is built into the regulatory framework that licenses US sportsbooks. State-licensed operators are required to file W-2Gs as a condition of their operating licenses. The information flows from operator to IRS as a regulatory by-product of the licensing relationship. No license, no filing infrastructure, no W-2G.
Offshore sportsbooks operating outside US regulatory jurisdiction are not part of that filing chain. Bovada does not file W-2Gs. BetUS does not file W-2Gs. None of the offshore operators serving California UFC bettors file any US tax documentation for any reason. The structural absence of a W-2G is a feature of the offshore model, not an indication that the underlying income is not reportable.
What the missing W-2G changes is the documentation burden. On a regulated win, the operator generates the documentation, sends it to the bettor and the IRS, and the bettor copies the number onto their return. On an offshore win, the bettor is the only party with documentation, and the only party responsible for accurate reporting. The income obligation is identical. The paperwork obligation is much heavier.
The asymmetric documentation burden is one of several reasons the regulated industry argues that offshore betting and prediction markets undermine the consumer-protection framework that licensed operators support. Bill Miller of the American Gaming Association has framed the broader argument repeatedly. Sports betting should be regulated by states and tribes. That is how consumers are protected and how communities receive their share of the benefit.
The tax reporting asymmetry is one of the most concrete examples of what unregulated operation costs the broader system — both the public revenue lost and the documentation friction transferred to the user.
See also: how to bet on ufc in california — tax implications.
The California FTB layer
California’s Franchise Tax Board treats gambling winnings as taxable California income for California residents. The FTB position mirrors the federal position on the taxability question, but with California-specific application of rates and deductions.
California income tax rates ranged from 1% to 13.3% across the 2025 tax year, with the top marginal rate applying to the highest income brackets. A California UFC bettor who cleared $10,000 in offshore winnings during the tax year would, for federal purposes, add that to their gross income and pay federal tax at their marginal rate. For California purposes, the same $10,000 is added to California taxable income and subject to California’s marginal rate structure. The state and federal obligations are layered, not alternative.
One specific California wrinkle worth understanding: California does not conform to all federal gambling-loss deduction rules. The federal rules allow gambling losses to be itemised as a deduction against gambling winnings (more on that below). California’s conformity to those rules has shifted over time and has specific limitations that differ from the federal treatment. A California UFC bettor who plans to itemise gambling losses needs to check current FTB guidance and probably needs professional advice on the California-specific treatment of losses.
The FTB has the same information-asymmetry problem that the IRS has with offshore winnings. The state receives no operator reporting from offshore books. Reporting accuracy depends on taxpayer honesty. Enforcement risk is real but operationally low for under-the-radar amounts. Both observations describe the practical environment; neither changes the legal obligation.
Deducting losses — and where the rules tighten
The federal treatment of gambling losses is more restrictive than most non-professional bettors realise, and the misunderstanding produces meaningful underestimation of tax exposure on UFC betting activity.
The rule is that gambling losses are deductible only to the extent of gambling winnings, only as an itemised deduction on Schedule A, and only when the taxpayer maintains adequate documentation of the losses. The “only to the extent of winnings” piece is critical. If a bettor wins $5,000 and loses $7,000 across the tax year, they cannot deduct the $7,000. They can deduct up to $5,000 — reducing taxable gambling income to zero — but the remaining $2,000 of net losses cannot offset other income. Gambling is a one-way deduction.
The Tax Cuts and Jobs Act of 2017 also changed the standard deduction landscape in a way that affects most non-professional bettors. Taking the standard deduction means forfeiting the gambling-loss deduction entirely. To deduct losses, the bettor must itemise — which only makes sense if total itemised deductions (gambling losses, state and local taxes, mortgage interest, charitable contributions, etc.) exceed the standard deduction.
For a typical California UFC bettor with moderate winnings and moderate losses, the math often produces an unpleasant result. The winnings are fully taxable. The losses can only offset the winnings if the bettor itemises. Itemising often does not make sense given the standard deduction levels. The net effect is that the bettor pays tax on gross winnings without effectively recovering through loss deductions.
Record keeping — the make-or-break habit
Adequate documentation of gambling activity is the difference between defensible tax reporting and exposure to penalties on audit. For offshore UFC betting specifically, where no operator paperwork arrives, the documentation burden falls entirely on the bettor. The records the IRS expects to see are detailed enough that retroactive reconstruction is nearly impossible. The discipline has to be built into the year, not the tax-return week.
The IRS guidance specifies what gambling records should contain. The basic requirements are: date of the wager, type of wager, amount of the wager, where the wager was placed (which book or platform), names of any other participants if relevant, and the amount won or lost on each wager. The records should be contemporaneous — kept at the time of the wager, not reconstructed later — and supported by independent documentation where available.
For offshore UFC betting, the practical record-keeping approach is to maintain a personal log alongside the offshore account history. The offshore book’s account history will typically show every transaction in detail, but exporting or preserving that history before the account is closed or restricted is the bettor’s responsibility. Many bettors lose access to their full account history when an offshore book closes their account or terminates service, which leaves them with no documentation of losses they would otherwise want to claim.
Cryptocurrency adds another layer of record-keeping complexity. Deposits and withdrawals in crypto need to be valued in US dollars at the time of each transaction for both gambling-income and capital-gains tax purposes. The crypto-to-fiat conversion at deposit and the fiat-to-crypto conversion at withdrawal are both potential taxable events on top of the gambling activity itself. The full architecture of crypto-based offshore betting is covered in my analysis of crypto deposits at offshore MMA books.
The practical posture for a California UFC bettor
The honest summary for a California resident running offshore UFC action is that the tax obligations attach regardless of how the betting feels legally, that no operator paperwork will help with reporting, that record keeping has to be your job from the start, that losses are deductible only to the extent of winnings and only with itemisation, and that the California state layer adds to the federal layer rather than replacing it. None of that is a reason not to bet. It is a reason to bet at a scale where the post-tax math still works for you, with the documentation in place to support whatever you eventually report. Treating tax compliance as an afterthought is the path to either chronic underreporting (with the enforcement risk that builds over time) or to scrambling to reconstruct records that are no longer available. Building the discipline into the betting routine from day one is far easier than fixing it after the fact.
