Ask what the expenditure actually represents.
Federal business deductions generally concern ordinary and necessary business expenses. Personal spending, asset purchases, debt principal and owner distributions raise different questions. Some costs must be capitalized or recovered over time rather than deducted immediately.
The IRS business-expense resource library points to guidance for specific categories. The right answer depends on the taxpayer, accounting method and applicable year. No checklist of merchants or credit-card descriptions can replace that review.
References: IRS business-expense resources
Make the source record useful.
Retain invoices, receipts, contracts and an explanation of the business purpose. A bank statement can confirm a payment but may not show what was purchased, who benefited or whether part of it was personal. Identify mixed-use expenses and reimbursements instead of hiding the distinction in a broad category.
A cleanup engagement may organize available evidence; it cannot invent missing substantiation. Tell the adviser where documents are unavailable before assuming the deduction is supported.
References: IRS recordkeeping
Travel and meals need their own facts.
Business travel requires a review of the purpose and the relevant tax-home and away-from-home rules. Meal deductions can be limited; entertainment is generally nondeductible. Maintain dates, business purpose, amounts and other required details rather than relying only on a receipt total.
Exceptions and reimbursement arrangements matter. Current IRS Publication 463 provides the framework, but its tax-year figures should not be carried into a later year without checking. This resource does not publish a mileage rate or a universal meal-deduction percentage.
References: IRS Publication 463: travel, meals and vehicles
Vehicles and equipment are not just year-end purchases.
Separate business and personal vehicle use and retain appropriate use records. Method choices and depreciation rules can affect the treatment in later years. Equipment decisions require purchase, use, timing and financing facts; the cash payment alone does not establish the deduction.
Do not buy an asset solely because someone calls it a write-off. A deduction reduces the relevant tax base under applicable rules, not the full cost of the purchase. Current expensing/depreciation provisions should be reviewed for the year before committing to a result.
References: IRS Publication 463: travel, meals and vehicles · IRS business-expense resources
Retirement contributions follow plan rules.
Retirement deductions require eligible compensation, plan terms and contribution/timing rules. An owner’s S-corporation distribution is not retirement-plan compensation. Use the separate Solo 401(k) guide for the distinction between employee deferrals, employer contributions and plan eligibility.
Bring a proposed expenditure or contribution to the adviser before acting. Tax planning can evaluate the question, while return preparation reports agreed items from supported records. Neither service includes an unsupported promise that every business payment will be deducted.
References: IRS S-corporation retirement contributions
Questions before the next step.
Is every expense on a business card deductible?
No. The nature, business purpose, limitations and evidence matter regardless of which account paid it.
Can cleanup recreate missing receipts?
It can investigate and organize available records within scope, but it cannot fabricate documents or establish a deduction without adequate support.