Whether you’re in business or not, there’s thing called “check washing”. It’s where a thief drives around taking mail out of mailboxes, then they bleach any checks and rewrite them to steal your money. The solution to this source of identity theft (the thief will have you account and routing number as well for future use until the account is shut down) is the Uniball 207 pen. It has a special permanent ink that can’t be bleached out It’s best for signing contracts or any time that security or document alteration is a concern. The nice thing is, they aren’t more expensive than regular pens and can be purchased online or at a local office supply store. I’ve even seen them at grocery stores. It’s cheap insurance against this kind of theft, especially if you pay your bills by putting a conventional check in the mailbox.