How to Document Gambling Losses: What the IRS Expects as Evidence
If you gamble — whether in a casino or online — you may be able to reduce your taxable income by claiming gambling losses on your federal tax return. However, there are a few important rules you need to know.
You Must Itemize Your Deductions. You can only deduct gambling losses if you itemize deductions on your tax return. If you claim the standard deduction, you cannot deduct gambling losses. Deciding which method yields a lower tax bill depends on your total expenses, so it is helpful to compare standard vs itemized gambling deductions before you begin your tax preparation.
Losses Can’t Exceed Winnings. Gambling losses can only be deducted up to the amount of your gambling winnings for the same tax year.
Some states allow gambling loss deductions similar to federal rules, while others limit or disallow them entirely. Always check your state tax rules to understand what applies to you.
Documenting Losses is Important
It is essential to maintain accurate records of both your gambling winnings and losses and to retain supporting documentation that can substantiate those amounts if requested. The IRS expects accurate and detailed records. Estimates or vague notes are generally not enough.
Maintaining a Gambling Diary
The IRS recommends keeping an accurate diary or similar record of your gambling activity. This can be maintained in a simple paper notebook, a digital spreadsheet, or a dedicated tracking app.
According to IRS guidance (see Publication 529), your gambling diary should generally include the following information:
- Date and type of each wager or gambling activity
- Name and address or location of the gambling establishment
- Names of other persons present with you at the establishment
- Amounts won or lost
A gambling diary helps create a clear, chronological record of your gambling activity throughout the year, showing when and where you gambled and the results of those activities. However, a diary alone is usually not sufficient. It should be supported by additional documentation, such as tickets, receipts, account statements, or other records that help verify your winnings and losses.
Supporting Documentation
In addition to your diary, you should retain supporting documentation that confirms your winnings and losses. Acceptable evidence may include:
- Wagering tickets
- Cancelled checks or substitute checks
- Credit records
- Bank withdrawal records
- Payment slips or win statements provided by the gambling establishment
These documents help verify the information recorded in your gambling diary. For this reason, it is advisable to retain any relevant documentation that reflects your gambling winnings or losses. Once you have these records organized, you can input the totals into a taxes on gambling winnings calculator to get a clearer picture of your potential tax obligation.
Records for Online Gambling
In the case of online gambling, many platforms provide win/loss statements summarizing your betting activity.
These statements typically show:
- Total wagers
- Total winnings
- Total losses
While such statements can be helpful, they should not be relied upon as the sole form of documentation. It is advisable to retain additional supporting evidence, such as:
- Account transaction histories
- Payment confirmations
- Bank or payment processor records
Maintaining both platform statements and your own records strengthens the reliability of your documentation.
The Session Method
Another commonly used record-keeping approach is the session method.
Instead of tracking every individual wager or spin, you record the net result of each gambling session. A session generally refers to a continuous period of gambling at the same online platform without leaving and later returning.
Summary
For individuals who participate in online gambling, the following practices are generally recommended:
- Maintain a diary or log of gambling sessions, including dates, games played, and net results.
- Use spreadsheets or dedicated apps to organize and track gambling activity.
- Request and retain annual win/loss statements from gambling platforms.
- Keep supporting documentation, such as transaction histories and payment records.
Together, these records can help substantiate gambling losses if required. Once your documentation is in order, you should check how state gambling tax rules in NJ, MI, PA, or WV might affect your final tax liability at the local level.
Important Disclaimer
This guidance is provided for general informational purposes only and does not constitute tax advice. It may not apply to every individual situation.
Tax rules can be complex and depend on a taxpayer’s specific circumstances. Therefore, it is strongly recommended to consult a qualified tax advisor or tax professional for advice tailored to your particular situation.
In particular, a tax professional can help determine what types and combination of evidence may be sufficient to substantiate gambling losses in your specific circumstances.
Sources used:
- Internal Revenue Service. Publication 529: Miscellaneous Deductions (Dec. 2020). Available at:
https://www.irs.gov/publications/p529 - Michigan Department of Treasury. Revenue Administrative Bulletin 2022-22: Treatment of Gambling Gains, Losses, and Expenses. Available at:
https://www.michigan.gov/taxes/-/media/Project/Websites/treasury/RAB/2022/RAB-202222-Treatment-of-Gambling-Gains-Losses-Expenses.pdf - JustAnswer. “I Gambled This Year and Ultimately Had a Major Net Loss.” Available at:
https://www.justanswer.com/tax/r00dj-gambled-year-ultimately-major-net-loss.html - CoCountant. “How to Prove Gambling Losses on Your Taxes.” Available at:
https://cocountant.com/blog/tax-planning/prove-gambling-losses-taxes/ - SDO CPA. “Can You Write Off Gambling Losses?” Available at:
https://www.sdocpa.com/can-you-write-off-gambling-losses/
