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The Law Office of Seth J. Howell, PLLC
Schedule C (1099) Deduction Guide
If you run your own business or get paid on a 1099, Schedule C is where you either pay too much in taxes or get it right.
You are taxed on your profit, not your revenue. That means every legitimate expense you track and claim lowers what you owe. The issue is not what you can deduct in theory, it is what you can actually support if anyone ever asks.
This walks through what counts, what does not, and how to stay on solid ground.
Every expense comes back to three things. It needs to be ordinary, necessary, and actually related to your business.
Ordinary just means it is common for what you do. Necessary means it is helpful and appropriate. Business-related means it is not personal.
If something is partly personal, you can still deduct the business portion. Just be consistent and be able to explain how you got there.
This is the easy stuff. Pens, paper, ink, postage, small tools, software subscriptions.
If you are using it to run the business, it generally counts.
Example. Buying toner and envelopes to send invoices to clients.
Things you pay for every month to keep the business running.
Internet, phone, cloud storage, software.
If something is shared, you split it. If your phone is used 60 percent for business, you deduct 60 percent of the bill.
If you are spending money to bring in clients, it is usually deductible.
Website costs, ads, business cards, branding, sponsorships tied to promotion.
Just make sure there is a real business purpose behind it.
Legal fees, accounting fees, bookkeeping, consulting.
If it is tied to the business, it is deductible.
If the trip is primarily for business, you can deduct the cost.
Flights, hotels, rides, baggage fees, tips.
Example. Traveling to a conference where you are actually attending and meeting people.
What does not count is adding a personal vacation onto the trip or bringing someone along who is not working.
Meals are deductible in a limited way.
If you are meeting with a client or traveling overnight for work, you can usually deduct half of the cost.
Keep the receipt. Note who you were with and what you discussed. That matters more than people think.
This one trips people up.
Tickets to games, concerts, golf, things like that are generally not deductible, even if you talk business.
Meals can still qualify, but entertainment itself usually does not.
You have two ways to handle this. Standard mileage or actual expenses.
Standard mileage is simpler. Actual expenses include gas, insurance, repairs, and depreciation.
You can deduct driving to clients, job sites, and temporary work locations.
You cannot deduct your normal commute.
Keep a mileage log. If this gets questioned and you do not have one, it is a problem.
This is valuable if you qualify.
You need a space you use regularly and exclusively for business. Not sometimes. Not shared with personal use.
You can either use a simplified method or calculate actual expenses like rent and utilities based on the percentage of your home used.
The exclusive use requirement is where most people get this wrong.
Computers, monitors, furniture, tools.
Some of these can be deducted all at once. Others need to be written off over time.
If you use something for both personal and business, you only deduct the business portion.
Business insurance is deductible. Liability coverage, malpractice, property coverage.
Health insurance may also be deductible, but that is handled separately on your return.
If you pay people to help you run the business, that is deductible.
This includes contractors and employees.
Make sure you handle the reporting correctly and keep records of payments.
Office rent, equipment leases, vehicle leases.
If you are leasing from someone related to you, the terms need to reflect market rates.
You can deduct education that helps you improve in your current business.
Courses, certifications, conferences.
You cannot deduct education that prepares you for a different line of work.
Professional memberships, industry publications, required licenses.
If it is part of staying in business or staying current, it usually qualifies.
Routine maintenance is deductible.
If you are improving something in a way that adds value or extends its life, that usually has to be handled differently and written off over time.
This applies in limited situations, mostly if you are using accrual accounting and have already reported income you never ended up collecting.
You need to be able to show what you spent, when, and why it was for the business.
That means receipts, invoices, mileage logs, and basic notes about purpose.
For travel, keep confirmations and agendas. For meals, note who you met and what was discussed. For larger purchases, keep invoices and dates.
Use a separate business account. It makes everything cleaner and easier to support.
If you cannot explain an expense clearly, it is not worth taking.
Mixing personal and business spending.
Calling commuting business mileage.
Expensing items that should be written off over time.
Trying to deduct entertainment.
Overstating home office use.
Not keeping records.
These are the things that tend to cause issues.
Track things as they happen instead of trying to recreate it later.
Be consistent with how you split mixed-use expenses.
Review your expenses before year end to catch anything you missed.
Think through larger purchases before making them so you know how they will be treated.
If something feels questionable, get a second opinion before you file.
Schedule C deductions are not complicated, but they do require discipline.
You are not trying to be aggressive. You are trying to be accurate and able to support what you claim.
If you handle it that way, you lower your tax bill without creating problems later.