So you think you might have items that cannot be fully substantiated or verified in an audit. Well, for starters, one thing that you do want to do in the future is try your very best to keep all of your receipts that you may be claiming deductions. In a lot of cases you won't be able to go back and just use credit card statements or something general. The IRS is almost certainly going to want to see an itemized statement so they can see what was actually purchased so that they can determine whether or not it's deductible. So definitely take every step you can to keep those itemized receipts. And if it's after the fact, do the best you can to reconstruct that and get as much information to the IRS as you can as to what was actually purchased. I've had clients that have gone back to vendors where they have lines of credit that have been able to get copies of invoices. There are things that you can do to re-create receipts if you did not keep them but definitely, to the best to your ability, you want to keep them. If you haven't done so, go back to your vendors in the places where you can and see if you can get copies of those receipts and itemizations.