Small Business Tax Deductions Checklist: What People Miss
Home office, vehicle, startup costs, retirement contributions, and more. Use this checklist to catch deductions small business owners often overlook.
Most small business owners know to deduct obvious costs like inventory and rent. The deductions that slip through the cracks tend to be the ones that feel personal, happen in small amounts, or only come up once. Over a full year, those missed items can add up.
Use this checklist to review your own business. The basic test for any business deduction is that the expense is ordinary and necessary for your line of work, and that you have records to back it up. IRS Publication 334, Tax Guide for Small Business, is a helpful reference for sole proprietors.
Can You Deduct a Home Office?
If you use part of your home regularly and exclusively for business, and it is your principal place of business or a place where you meet clients, you may be able to deduct a portion of your home costs. A guest room that doubles as an office usually does not qualify. A dedicated room or clearly defined area used only for work often does.
You generally have two ways to figure the deduction:
- Simplified method: a set rate per square foot of office space, up to a maximum square footage. The IRS sets the rate, so check the current figure.
- Regular method: a percentage of actual costs such as rent or mortgage interest, utilities, insurance, repairs, and depreciation, figured on Form 8829.
Under current federal law, W-2 employees generally cannot claim a home office deduction for work they do for an employer. This deduction is for self-employed people and business owners. IRS Publication 587 covers the details.
How Do You Deduct Vehicle Expenses for Your Business?
Business driving to clients, job sites, suppliers, or the bank is deductible. Commuting from home to a regular place of business generally is not. You can usually choose between:
- The standard mileage rate, which the IRS updates each year, multiplied by your business miles, plus business parking and tolls
- Actual expenses, such as fuel, repairs, insurance, registration, and depreciation, multiplied by your business-use percentage
The choice you make in the first year a vehicle is used for business can limit your options later, so it is worth deciding carefully. Either way, the IRS expects a mileage log showing dates, destinations, business purpose, and miles. IRS Publication 463 explains the rules.
Which Small Business Deductions Are Most Often Missed?
Here is a checklist of items we commonly see overlooked or under-claimed:
Startup and organizational costs
Costs you paid before opening, such as market research, training, advertising, and legal fees to form your entity, are often forgotten. You can generally deduct a limited amount in your first year and amortize the rest over 15 years.
Retirement plan contributions
A SEP IRA, SIMPLE IRA, or solo 401(k) can let you save for retirement and reduce taxable income. Contribution limits change annually, and some plans can be set up or funded up to your filing deadline. Small employers starting a new plan may also qualify for a tax credit for setup costs. IRS Publication 560 covers these plans.
Self-employed health insurance
If you are self-employed and not eligible for a plan subsidized by your own or your spouse's employer, you may be able to deduct health, dental, and qualifying long-term care premiums for yourself, your spouse, and your dependents. S corporation owners with more than 2% ownership follow special payroll reporting rules to claim this.
Education and training
Courses, seminars, licenses, and professional books that maintain or improve skills in your current business are generally deductible. Education that qualifies you for a new trade or profession generally is not.
Software, subscriptions, and technology
Accounting software, cloud storage, design tools, website hosting, and other subscriptions add up quickly. So do the business-use share of your cell phone and internet service.
Equipment and furniture
Computers, machinery, and office furniture may be deductible right away or depreciated over time. The rules for immediate expensing have changed more than once in recent years, so ask us which approach fits your situation. IRS Publication 946 explains depreciation.
Business travel
When you travel away from your tax home overnight for business, costs such as airfare, lodging, rental cars, and baggage fees are generally deductible. If you add vacation days to a business trip, you will need to separate the personal portion. Keep an itinerary or calendar showing the business purpose of each day, along with conference agendas or client meeting notes.
Other easy-to-miss items
- Bank fees, credit card merchant fees, and payment processor charges
- Interest on business loans and business credit cards
- Professional fees for your CPA, attorney, or consultants
- Business insurance premiums
- Local business license and occupation tax fees
- Advertising, marketing, and website costs
- Payments to independent contractors (and the Form 1099 filings that go with them)
- Business travel, and the deductible portion of business meals
- Bad debts, for businesses that report income on the accrual method
- Membership dues for trade and professional associations
What Records Do You Need to Support Business Deductions?
A deduction is only as strong as the paperwork behind it. If the IRS asks questions, you need to show what you paid, when, to whom, and why it was for business. Here is a practical routine:
- Open a separate business bank account and credit card and run every business transaction through them.
- Capture receipts right away with a phone app or your accounting software's receipt feature, and note the business purpose.
- Keep a contemporaneous mileage log using an app or a notebook in the car.
- Record who attended and what was discussed for business meals.
- Measure and photograph your home office and save utility bills, rent, or mortgage statements.
- Keep invoices and contracts for large purchases and contractor payments.
- Reconcile your books monthly so nothing gets lost by year end.
IRS Publication 583 covers basic business recordkeeping. For how long to keep each type of document, see our record retention guide.
What Expenses Are Not Deductible?
Knowing what does not count is just as useful. Common examples include personal expenses, commuting, clothing that is suitable for everyday wear, fines and penalties paid to a government, political contributions, and most entertainment. Mixed-use items, such as a phone or vehicle, are deductible only for the business-use portion. Claiming personal costs as business expenses is one of the fastest ways to draw IRS attention.
The best time to use this checklist is during the year, not in March. A quick quarterly review lets you time equipment purchases, open or fund a retirement plan, and fix gaps in your records while the details are still fresh.
How Heaven & Alvarez Can Help
We review your books with these deductions in mind, apply the current year's limits and rates, and help you set up records that hold up if questions ever arise. Our business tax preparation service handles the return, and our small business accounting service keeps your expenses categorized correctly all year. Call (770) 849-0078 to schedule a review with our Norcross team.
This article is general information, not individual tax advice. Deduction rules, limits, and rates change; please consult a tax professional about your situation.
Frequently asked questions
Can I deduct business expenses if my business lost money this year?
Generally, yes. Legitimate business expenses are still deductible even if they exceed your income, and a net loss may offset other income or carry to other years, subject to limits. However, if the activity looks more like a hobby than a business, deductions can be restricted, so keep records that show a profit motive.
Do I need a receipt for every business expense?
You need adequate records for every expense, and receipts are the best evidence. Bank and credit card statements show you paid something, but not always what it was for. For travel, meals, gifts, and vehicle use, the IRS expects more detailed documentation.
Can I deduct my cell phone if I also use it personally?
You can generally deduct the business-use percentage of your phone and service costs. Estimate that percentage reasonably and be consistent. If you have a second line used only for business, that line is usually fully deductible.
Is it too late to claim a deduction I missed on last year's return?
Often it is not. You can generally file an amended return to claim a refund within three years of the date you filed the original return, or two years from when you paid the tax, whichever is later. We can review whether amending makes sense.
