You can prove your losses with the spreadsheet you mentioned if it has all the information require by the IRS. This includes:
- The date and type of your specific wager or wagering activity.
- The name and address or location of the gambling establishment.
- The names of other persons present with you at the gambling establishment.
- The amount(s) you won or lost.
See Gambling Losses Up to the Amount of Gambling Winnings
You can also complete Form 5754, Statement by Person(s) Receiving Gambling Winnings
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