How Small Business Owners Can Maximize Tax Deductions This Filing Season

Small business owners can improve their tax results this filing season by focusing on three core areas: claiming all ordinary and necessary business expenses, applying the right capitalization and depreciation rules, and maintaining records strong enough to support every deduction claimed. Under IRC § 162(a), a taxpayer may deduct ordinary and necessary expenses paid or incurred during the taxable year in carrying on a trade or business, including compensation, travel, and rent.

For many businesses, the biggest missed opportunities are not exotic tax strategies. They are routine deductions that are either overlooked, misclassified, or poorly documented. IRS guidance for small businesses emphasizes that deductible operating costs generally include items such as advertising, utilities, supplies, repairs, licenses, certain professional fees, wages, and employer payroll taxes, assuming they are business-related and properly substantiated.

A key distinction is between current expenses and capital expenditures. IRC § 263(a) disallows a current deduction for amounts paid for new buildings, permanent improvements, or restorations that increase value or extend useful life; those costs generally must be capitalized and recovered over time unless a specific expensing rule applies. That means small business owners should review whether purchases are immediately deductible operating costs or assets that must be depreciated.

Depreciation planning remains one of the most important deduction areas. Under MACRS, tangible property is generally depreciated under the general depreciation system unless ADS is required or elected. For tax years beginning in 2025, the section 179 expensing limit is $2,500,000, with a phaseout beginning at $4,000,000 of qualifying property placed in service; for 2026, those amounts are $2,560,000 and $4,090,000. Section 179 is applied before bonus depreciation.

Bonus depreciation changed significantly. For qualified property acquired after January 19, 2025, 100% bonus depreciation is generally available on qualified business property under IRC § 168(k), replacing the prior phase-down for those acquisitions. By contrast, property acquired before January 20, 2025 generally remains subject to the older phase-down schedule, including a 40% rate for property placed in service during 2025 and 20% for 2026. This acquisition-date distinction is now critical in fixed-asset reviews.

Vehicle deductions also deserve close attention. A business owner may generally use either actual expenses or the standard mileage rate, subject to eligibility rules. For 2025, the standard mileage rate for business use is 70 cents per mile. If actual expenses are used, only the business-use portion is deductible, and commuting remains nondeductible personal expense. Passenger automobiles are also subject to annual depreciation caps, even where bonus depreciation applies.

For home-based businesses, the home office deduction can be valuable if the space is used exclusively and regularly for business and qualifies as the principal place of business, a place to meet clients, or a separate business structure. Taxpayers may use actual expenses or the simplified method, which generally allows $5 per square foot up to 300 square feet.

Self-employed health insurance is another important above-the-line deduction. IRC § 162(l) allows a deduction for premiums paid for the taxpayer, spouse, dependents, and certain children under age 27, subject to earned-income and other-coverage limitations.

Not every business outlay is deductible. IRC § 162 denies deductions for certain lobbying and political expenditures, and IRC § 162(f) generally disallows deductions for fines, penalties, and similar amounts paid to or at the direction of a government, subject to limited exceptions such as qualifying restitution or compliance payments that meet statutory identification and establishment requirements. Meals are generally only 50% deductible, and entertainment expenses are generally nondeductible.

Finally, deduction optimization depends on substantiation. The Code requires taxpayers to maintain records sufficient to establish income and deductions, and the stricter substantiation rules of IRC § 274(d) apply to travel, certain meals, gifts, and listed property (Taxpayer Advocate Service). IRS recordkeeping guidance stresses separate business accounts, retained receipts and invoices, mileage logs, and asset records showing cost, placed-in-service date, depreciation claimed, and disposition information.

In practice, small business owners get the best tax outcome when they review expenses with four questions in mind: Is the item ordinary and necessary under IRC § 162, must it be capitalized under IRC § 263, is accelerated cost recovery available under IRC §§ 168 or 179, and do the records satisfy substantiation requirements. For the current filing season, that disciplined review is usually where the real tax savings are found.