Tithing is tax deductible, as it is treated as a donation or contribution to a charitable organization, according to the Internal Revenue Service. It's important to note however, that only donations made to qualified organizations can be claimed. Additionally, the amounts must be itemized on the tax return in order to receive the deduction.
Though most churches and religious organizations meet the qualified-organization requirement, those tithing should check with their church to verify their status before claiming the deduction. Additionally, the IRS states that to qualify for tax credit, a person must typically make the tithe or donation by check or identify a cash contribution with a name, so that the church can give a proper accounting. For those who tithe regularly, some churches will typically send statements of giving that serve as documentation for the deduction.