Will a cancelled check suffice in place of a receipt?

[Shane Moss]

Will a cancelled check suffice in place of a receipt? I ask because I recently had my property completely re-plumbed by my co-worker's brother. I've been so busy I didn't think about having him sign a receipt and since he was doing this on the side, he works for a plumbing company, he wouldn't have had a receipt ready. I can ask him to sign a receipt, but if he's reluctant because of tax reasons, will the cancelled check that I wrote to him work for the deduction?