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Part of Business deductions rest on a test, not a category list
Business deductions checklist: what to record and when
Business deductions checklist for setting up records, tracking mileage and expenses monthly, and gathering asset, contractor, and return documents at filing.
A business deductions checklist works only if the record is made when the transaction happens. This one is organized by timing: a drive, meal, or trip purpose is easiest to document at the time, not reconstruct at filing.
What to take away
- Records are made at the time or not at all. So the checklist is a calendar, not a list of categories.
- Deductible is a question of fact plus rule. The fact is yours to record. The rule is the IRS's for your year, and a CPA or enrolled agent applies it.
- Keep the why with the what. A receipt shows what you spent; only you can write down why.
- A category label is not a deduction decision. Confirm eligibility and tax treatment for the year before claiming an item.
Before the year starts
- Open a business bank account and card, and run business spending through them only. One mixed account creates more work than every other item on this list combined.
- Choose one place for records and one method for keeping them. It matters less which than that you use it.
- Decide how business miles will be captured, and start on day one. The mileage rates page explains why the log is the thing, whichever method is later used.
- For 2025, the standard mileage rate for business use is 70 cents per mile.
- If part of your home is used for the business, measure the space, photograph it, and note the date. Conditions attach to that claim, and the measurement is the first thing asked for.
- Set up ledger categories for home office, vehicle, meals, travel, and supplies, and ask your preparer how to record mixed-use items.
- If owners or employees pay business costs from their own pockets, ask the preparer how to document reimbursements for your entity. For employee reimbursements, an accountable plan requires a business connection, substantiation, and return of excess advances. The tax treatment depends on entity tax treatment.
Every month
Monthly Deductions Checklist
- Reconcile bank and card accounts
- Categorize transactions, note business purpose
- Keep mileage log current
- Save all receipts
- Flag potential assets for preparer
- Note business-use percentages
- Reconcile the bank and card accounts to the ledger.
- Categorize while you remember. For anything ambiguous, write the business purpose in the memo line.
- Check the mileage log is being kept as trips happen, not reconstructed at month end.
- For vehicle, travel, meals, and supplies, keep the receipt and record the date, amount, and business purpose. For mixed-use items, note how you determined the business share.
- Keep the receipt. Whether a particular receipt is required is a rule your preparer knows; keeping all of them costs a folder.
- Flag anything that might be an asset rather than an expense. Do not decide; flag it for the preparer. Which purchases are deducted at once and which over years is an IRS rule, not a bookkeeping preference.
- For a possible asset, keep the invoice and note when it was placed in service. Ask whether Section 179, bonus depreciation, or the de minimis safe harbor applies; do not assume a purchase qualifies for immediate expensing.
- Note the business share of anything sharedthe phone, the vehicle, the home, the internet. Write down the basis for the share while you can still explain it.
At year end
Year-End Records to Gather
- Record odometer on Dec 31 and Jan 1
- Count inventory if holding stock
- List assets bought, sold, scrapped
- Collect loan, insurance, subscription statements
- List employees and contractors paid
- Note prepaid or accrued expenses
- For contractors, gather each Form W-9 and the payment records. Ask your preparer whether Form 1099-NEC is required and confirm the current-year filing and recipient deadlines.
At filing
Filing Handoff Checklist
- Give categorized ledger and asset list
- Provide mileage log and split percentages
- Answer preparer questions honestly
- Review claimed and unclaimed deductions
- Keep return with supporting records
- Hand over the categorized ledger, the asset list, the mileage log, and the split percentages with how you arrived at them.
- For a sole proprietor, reconcile the business income and expense records to Schedule C (Form 1040). Provide the asset details needed for Form 4562, Depreciation and Amortization, when applicable.
- Answer the preparer's questions honestly. "I don't know" is a better answer than a guess, because a guess becomes a number on a signed return.
- Review what was claimed and what was not. The business deductions overview describes the categories most often left out.
- Keep the return as filed together with everything that supports it. The IRS's page on recordkeeping for small businesses explains what to keep and why; how long is on the same site, and it varies by what the record supports.
The questions to bring
- Which of my categories do you want split differently?
- Which purchases on my asset list are assets in your view, and which are expenses?
- Which items would you want more support for if the IRS asked?
- What record would have made your job easier this year?
- What did I fail to claim?
Where to check
| Source | Use it for |
|---|---|
| IRS Publication 334, Tax Guide for Small Business | The plain overview of business income and expenses for your year |
| IRS recordkeeping pages | What records to keep and for how long |
| The instructions for your return | What each expense line expects |
| A CPA or enrolled agent | Whether a specific cost is deductible, and in which year |
For forms, check the current-year Instructions for Schedule C (Form 1040) and Instructions for Form 4562. For recordkeeping and retention, use the IRS small-business recordkeeping guidance and its page titled “How long should I keep records?”
How long each record has to be kept depends on what it supports. Use the IRS page titled “How long should I keep records?” to check the applicable retention guidance for the return, property, or claim.
Common questions
Do I really need to write down why?
Yes. The bank statement proves the money moved. Nothing but your note proves it was for the business, and a note written at the time is worth more than one written under questioning.
What if I have no records for the first half of the year?
Reconstruct from bank and card statements, mark what you are unsure of, and tell the preparer which items are reconstructed. Do not present a reconstruction as a record.
Can the checklist be done in one sitting?
The year-end and filing parts can. The monthly part cannot, by definition. That is the point of it.
Who decides whether an item is deductible?
The IRS's rules for the year, applied by your preparer to your facts. The checklist gets the facts in front of them. Keep the whole package with your tax records once it is filed.
