Missing Form 8283

[AccTaxMan]

Does anyone knows what will happen if a taxpayer has filed a tax return without attaching a Form 8283 (his non-cash donation is more than $500)? Do they just disallow the deduction or ask the taxpayer to fill the form and send to them?

[ChEAr$]

Does anyone knows what will happen if a taxpayer has filed a tax return without attaching a Form 8283 (his non-cash donation is more than $500)? Do they just disallow the deduction or ask the taxpayer to fill the form and send to them?

The latter. IRS will just consider it a missing document and request it.