Generally speaking if the work you did was charity work and you were working for a charitable organization, it is a valid question. The group that sponsored your mission will be able to tell you if this has be allowed as a deduction in the past, if you are not risk averese you can give it a try. Talk with you accountant as well. but my inclination is that this would be questioned as a vacation in an audit.
The following excerpt from IRS Publication 526 should give you guidelines for the appropriate tax treatement for your charitable expenses.
Generally, you can claim a charitable contribution deduction for travel expenses necessarily incurred while you are away from home performing services for a charitable organization only if there is no significant element of personal pleasure, recreation, or vacation in the travel. This applies whether you pay the expenses directly or indirectly. You are paying the expenses indirectly if you make a payment to the charitable organization and the organization pays for your travel expenses.
The deduction for travel expenses will not be denied simply because you enjoy providing services to the charitable organization. Even if you enjoy the trip, you can take a charitable contribution deduction for your travel expenses if you are on duty in a genuine and substantial sense throughout the trip. However, if you have only nominal duties, or if for significant parts of the trip you do not have any duties, you cannot deduct your travel expenses.
Example 1.You are a troop leader for a tax-exempt youth group and you help take the group on a camping trip. You are responsible for overseeing the setup of the camp and for providing adult supervision for other activities during the entire trip. You participate in the activities of the group and really enjoy your time with them. You oversee the breaking of camp and you help transport the group home. You can deduct your travel expenses.
Example 2.You sail from one island to another and spend 8 hours a day counting whales and other forms of marine life. The project is sponsored by a charitable organization. In most circumstances, you cannot deduct your expenses.
Example 3.You work for several hours each morning on an archeological dig sponsored by a charitable organization. The rest of the day is free for recreation and sightseeing. You cannot take a charitable contribution deduction even though you work very hard during those few hours.
Example 4.You spend the entire day attending a charitable organization's regional meeting as a chosen representative. In the evening you go to the theater. You can claim your travel expenses as charitable contributions, but you cannot claim the cost of your evening at the theater.
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