The Best Way to Track Expenses Across Multiple Businesses
Running more than one business or side venture? Mixing their expenses is a fast way to muddy your books. Here is how to keep each entity's expenses separate in one place.
Mylo Team • September 5, 2026 • 2 min read
The short answer
If you run more than one business, a side venture alongside a main one, or a couple of LLCs, their expenses have to stay separate. Each files its own taxes, and mixing spending muddies every set of books. The best setup keeps each entity distinct while letting you manage them all in one place, so separation does not mean juggling logins.
Why mixing is costly
Blended expenses across businesses cause the same problems as mixing business and personal, multiplied. Deductions get harder to defend because you cannot cleanly show which entity incurred what. Taxes take longer and cost more. And for LLCs or corporations, commingling funds across entities can weaken the liability separation each one depends on. Clean books per business protect all of that.
What a good multi-business setup looks like
Three things make it work: every receipt and expense tags to the business it belongs to; you can switch between businesses without signing in and out of separate accounts; and each business exports on its own to its books or accountant. When expenses genuinely belong to an entity rather than to a shared pile, the separation holds up automatically.
Keeping it clean over time
The habit is the same as with a single business, applied per entity: run each business's spending through its own account, tag as you go, and reconcile regularly. See how to separate business and personal expenses for the foundation, and a self-employed expense tracker for keeping each set current.
The faster way: one app, every business kept apart
Juggling a login per business, or one messy pile for all of them, is the slow way. Mylo takes that whole job off your plate before it becomes one. Working quietly in the background, it captures receipts from your inbox and the stores you shop at, matches each to the card charge that paid for it, and files it as a categorized expense, ready to review or sync to QuickBooks. No new card and no manual entry: it works on top of the Visa, Mastercard, or Amex you already use. Free for individuals on iOS, Android, and the web; teams are $9/user/mo (30-day free trial).
Sources: IRS guidance on business recordkeeping (Publication 583). This article is general information, not tax advice. Rules change and situations differ, so check with a qualified tax professional for your situation.
Frequently asked questions
Can I track two businesses in one expense app?
Yes, with the right tool. The goal is to keep each entity's receipts and expenses separate while managing them in one place, so you are not juggling multiple logins or mixing spending across businesses.
Why keep the businesses separate?
Each business files its own taxes and, if it is an LLC or corporation, relies on separated finances for liability protection. Mixed expenses muddy the books, weaken your records, and can undermine that protection.
How do shared costs work across businesses?
A cost that genuinely serves two businesses should be split by a reasonable basis and recorded against each, not dumped on whichever is convenient. Keep the logic consistent so each entity's books hold up.
How does Mylo handle multiple businesses?
Mylo lets expenses belong to the right business and lets you switch between them, so each entity keeps its own clean set of receipts and expenses without crossing the streams.
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Mylo Team
The Mylo Team writes practical guides on receipts, expenses, write-offs and keeping your books clean, from the people building Mylo, the app that puts receipts and expenses on autopilot.
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