Tax Deduction

A tax deduction is a business expense that reduces your taxable income. The more legitimate deductions you claim, the less tax you pay. Common deductions include rent, supplies, mileage, insurance, and professional services.

Tax Deduction Definition

A tax deduction is an expense the IRS allows you to subtract from your gross income before calculating taxes owed. Deductions reduce your taxable income — not your tax bill directly (that's a tax credit).

How Deductions Save Money

If you're in the 24% tax bracket and claim a $1,000 deduction, you save $1,000 × 24% = $240 in taxes. The deduction doesn't save you the full $1,000 — it saves you the tax you would have paid on that $1,000.

Common Business Tax Deductions

Office rent — full deduction for business-only space

Home office — simplified method ($5/sq ft, max 300 sq ft) or actual expenses

Business insurance — liability, property, workers' comp, professional liability

Vehicle/mileage — standard rate ($0.70/mile for 2026) or actual expenses

Professional services — CPA, attorney, consultant fees

Marketing and advertising — website, ads, promotional materials

Software subscriptions — QBO, project management, CRM, etc.

Employee salaries and benefits — including health insurance, retirement contributions

Supplies and materials — office supplies, tools, inventory

Travel and meals — business travel (100%) and business meals (50%)

Deductions vs. Credits

Deduction — reduces taxable income (saves you a percentage of the deduction amount)

Credit — reduces tax owed dollar-for-dollar (more valuable per dollar)

How to Track Deductions in QuickBooks

Proper categorization is everything. Every expense in QuickBooks should be assigned to the correct account — these map directly to your tax return line items. Your P&L organized by expense category IS your deduction summary.

FAQ

Q: Can I deduct an expense if I don't have a receipt?

A: The IRS requires documentation. For expenses under $75 (except lodging), you can use bank/credit card statements. Above $75, keep the actual receipt. No documentation = no deduction if audited.

Related Terms

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Related Terms

Reconciliation

Reconciliation is the process of comparing two sets of records to make sure they agree. In bookkeeping, it most commonly means matching your internal accounting records (like your QuickBooks register) against your bank statement to verify every transaction is accounted for and the balances match. An

Mileage Deduction

A tax deduction for business-related driving, calculated using the IRS standard mileage rate ($0.70/mile for 2026) or actual vehicle expenses.

Statement of Cash Flows

The statement of cash flows is a financial report that shows how cash moves in and out of your business over a specific period. It's divided into three sections: operating activities (day-to-day business), investing activities (buying/selling assets), and financing activities (loans, investments, di

Write-Off

A write-off is the removal of an asset from your books when it no longer has value or can't be collected. Common write-offs include bad debts (uncollectible receivables), obsolete inventory, damaged equipment, or worthless investments. The write-off reduces the asset on your balance sheet and typica

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