Business vs Personal Expense Splitter
Mixing personal and business expenses is the single most common small-business bookkeeping mistake. List your expenses with a business-use percentage to see exactly what's deductible.
To split expenses, list each expense with its amount and business-use percentage — the deductible and non-deductible portions are calculated instantly for each line and totaled.
Add expenses with an amount to see the split.
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How to use Business vs Personal Expense Splitter
- 1Add each expense with a short description and amount.
- 2Enter what percentage of it was for business use (100% for fully business, less for mixed-use).
- 3See the deductible and non-deductible split for each line and the total.
Why this matters
Mixing personal and business finances distorts your financial statements, inflates your tax liability by missing deductions (or understating them incorrectly), and increases audit risk. A clean, itemized split is the fix.
Common mixed-use expenses
Phone and internet bills, home office utilities, and a personal vehicle used partly for business are the most common mixed-use cases — each typically gets a business-use percentage rather than a flat 0% or 100%.
Frequently Asked Questions
How do I know what business-use percentage to use?
It should reflect actual usage — e.g. if you use your phone 60% for business calls and 40% personally, use 60%. Keep a log or reasonable estimate to support the percentage if ever asked.
Does this file my taxes for me?
No — this only splits and totals your expenses so you (or your accountant) know what's deductible. It doesn't file anything or connect to any tax authority.
Is my financial data uploaded anywhere?
No. Every calculator on this site runs entirely in your browser — nothing you enter is sent to a server.
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