Full-Time Gambling and Tax: What Proves a Trade or Business?
Read the current wagering-loss statute and effective-date note.
If wagering has become your main work, keeping the tax records straight can be difficult—especially after a losing year. Start with two questions: Does the activity qualify as a trade or business, and how much of the losses and expenses does the tax law allow? A dated work record helps answer the first. A separate calculation under the rule for your tax year answers the second.
Show a sustained schedule with dated records
In Commissioner v. Groetzinger, 480 U.S. 23, 35–36 (1987), the Supreme Court applied continuity, regularity and a primary income-or-profit purpose to a full-time gambler. His detailed daily records and sustained work supported business treatment despite a losing year.
Build your own calendar from wagering tickets, account statements, travel records and contemporaneous notes. Identify days and hours spent placing and researching wagers, recording results and reviewing your approach. Mark gaps and periods of occasional recreation honestly. The point is to document the work you actually did; reconstructing a full-time schedule from memory gives an examiner less reliable evidence.
Calculate the loss limit separately
For taxable years beginning after December 31, 2025, section 165(d) allows a deduction equal to 90 percent of wagering losses, capped at wagering gains. The statute includes otherwise allowable deductions incurred in carrying on wagering transactions within those losses. Establishing a business does not remove that calculation.
Hypothetical example: Assume a calendar-year 2026 taxpayer has $10,000 in wagering gains, $10,000 in wagering losses and no related expenses. Ninety percent of the losses is $9,000, which is below the $10,000 gains cap. The calculation leaves a $1,000 difference before considering other return items. That difference is not the amount of tax owed. Use the rule for the actual tax year, and account for any related expenses before calculating the deduction.
Explain differences between statements and your log
Keep gross winnings and losses separately, along with the records supporting each. Compare your log with Forms W-2G, betting-account statements and bank activity. A deposit or withdrawal alone may not explain the underlying wagers. If a statement and your log disagree, identify the transaction, retain both records and explain the difference before carrying a figure onto the return.
For a tax review, organize the material by year and account, and identify any missing statements. Keep ordinary living expenses apart from wagering transactions. A spreadsheet can summarize the evidence, but the tickets, statements and dated entries let your adviser check how you reached each total.
Show how you pursued income or profit
A calendar addresses regularity; it does not by itself explain purpose. Preserve records of your methods, bankroll management, review of results and changes made after losses. These are practical ways to document your conduct, not a separate court-created checklist or a guarantee of business status. Explain how the activity was intended to produce income and how your actions followed that purpose.
A losing year calls for examining the pattern and purpose of the activity. The Groetzinger case analysis explains the evidence and the historical minimum-tax dispute. This guide focuses on preparing your own records and applying the current loss limit.
Prepare the records for a tax review
- Bring dated records showing your actual schedule and income-or-profit purpose.
- Provide gross winnings, losses and related wagering expenses, with the records behind each total.
- Flag gaps or discrepancies between your log, statements and reported amounts.
- Include the return and any IRS or FTB notice so your adviser can check the tax year, disputed issue and response deadline.
Frequently asked questions
Does a losing year prevent business classification?
Not necessarily. Groetzinger involved sustained livelihood activity despite a net loss. The actual pattern and purpose matter, and the applicable deduction limit remains a separate question.
Can I deduct all losses if I qualify as a business?
Do not assume so. For taxable years beginning after December 31, 2025, section 165(d) applies its 90-percent rule and winnings cap, including the specified otherwise allowable wagering-related deductions.
Does the 1978 calculation control a 2026 return?
No. The case decided classification under the provisions before it. A current return requires the applicable year’s loss, reporting and other tax rules.
Review Your Professional Gambling Tax Records
Mishra X Trial Lawyers evaluates trade-or-business claims and IRS or FTB audit disputes for professional gamblers. Bring your contemporaneous wagering logs, Forms W-2G, bank statements, and tax audit notices for a review. Call (949) 343-9735 or email office@mishrax.com.