The foundation is separate accounts. Open a business checking account if you don’t have one, and get a business credit card. Every business expense flows through business accounts. Every personal expense flows through personal accounts. That single rule prevents most of the mess.

For the business bank account, most banks offer free or low-cost business checking. You don’t need anything fancy. You need a place where business income lands and business expenses leave, completely isolated from your personal money.

A dedicated business credit card serves the same purpose for card purchases. When you buy office supplies, software subscriptions, or materials for a job, it goes on the business card. When you buy groceries or pay for a family dinner, it goes on a personal card. No sorting required because the separation happens at the point of purchase.

Pay yourself consistently. If you’re a sole proprietor or single-member LLC, take owner’s draws from the business account to your personal account on a regular schedule. If you’re an S-corp, run payroll for yourself. Either way, the transfer from business to personal should be documented as what it is. You’re taking money out of the business for personal use.

When you accidentally use a personal card for a business expense, record it in your books with the payment side coded to an owner equity account. The expense still counts as a business deduction. You’re just noting that you personally covered it. When business money pays for something personal, record it as an owner’s draw. That $50 from the business account for your kid’s birthday present isn’t an expense. It’s you withdrawing money from your business.

Review your accounts weekly or at least monthly. Catch the times you grabbed the wrong card before they pile up into a year’s worth of sorting. A five-minute weekly review prevents hours of cleanup later. Monthly bookkeeping can maintain the separation once it’s established, but you have to create the structure first.

For LLCs and corporations, separation matters even more. Mixing business and personal finances can pierce the corporate veil, meaning you lose the liability protection you formed the entity to get. Courts look at whether you treated the business as separate from yourself. Commingled finances suggest you didn’t.

If your finances are already tangled together, separating them going forward still helps. Start clean from today. Many bookkeepers in New Mexico can sort through the historical mess while you focus on keeping things separate moving forward. The IRS doesn’t require separate accounts, but they make your life dramatically easier at tax time and give you accurate numbers to actually run your business.