Contrary to popular opinion, you don't have to rent office space or a venue in order to deduct or claim it as an expense. If you work from home, and have a section of your home that is allocated to your business, then you can deduct that portion of your home office on your taxes.
If half of your phone and internet usage goes towards your business necessities, then you can claim that as an expense.
Any education or training that is needed to keep you up to date and knowledgeable in your field is considered a tax deductible expense.
Whether you travel for work by car or airplane, you may be entitled to multiple deductions. Airfare, hotels, a portion of food and gas/mileage, a portion of recurring automobile maintenance fees such as insurance, maintenance, and part of the cost of the car, are all travel related expenses. See IRS guidelines for travel expenses.
Miscellaneous expenses such as software subscriptions, business magazine subscriptions, envelopes, business cards, printer cartridges, pens, etc., are all tax deductible expenses and fall into different expense categories.
Many physical assets that have a useful life greater than 1 year may be depreciated. Depreciation is when, rather than deducting the total cost of a business purchase at the time of the fact, you deduct a portion of its total cost every year until it reaches the end of its useful life (salvage). Two great examples would be laptops and cameras.
Just as with physical assets/equipment, intangible assets may be expensed over their useful life of greater than 1 year. Amortization is the equivalent of depreciation but applies to intangible assets, such as software licenses, domain names, intellectual property, customer lists, and more. See IRS guidelines for depreciation and amortization.
***Disclaimer: This article is for informational purposes and is not meant to be financial or legal advice***