I once encountered a taxpayer who spread single expense deductions among several categories or accounts. For example a $1,000 rent expense would be allocated or spread among 4 categories or accounts such as:
rent $250
utilities $250
insurance $250
taxes $250
rather than deducting it as $1,000 of rent.
Since the deduction was allowable I concluded that
the taxpayer made this allocation so that each
category of expense was smaller thereby reducing the chance of being audited. The taxpayer could not or did not provide an acceptable reason. I just thought this was interesting.