S Corp Tax Deductions: What S Corporation Owners Can Write Off

S corporations are a specific type of tax designation, and they can quickly become confusing if you’re not an accountant. Because they’re not technically a business structure, your business can be an S Corporation and also a Limited Liability Company (LLC) or standard corporation.

An S corp refers to how you deduct your legitimate business expenses, how the owner pays themselves, and how you pay out your shareholders. Here, we’ll look at how reducing profits helps you avoid higher taxes, how to identify and classify expenses to avoid audits, and why owners need a solid salary strategy before deducing expenses.

Keep in mind that however you file, even if you let your accountant take care of everything, understanding the S Corp tax deductions can help you avoid unnecessary headaches down the line. 

How S corp deductions work 

S corps are known as pass-through entities, meaning the business deducts expenses from the company’s income and the profits go directly to shareholders’ returns. S corps typically use Schedule K-1 forms to list the business’ revenue, losses, deductions, and credits (if applicable). S corps put more onus on shareholders because it ultimately means tracking more numbers for their personal returns, but the extra effort is often worth it because shareholders can be taxed at a lower percentage rate than an LLC. 

To be considered legitimate, deductions need to be appropriate for the business.  So, a writer might deduct a portion of their personal travel expenses because it inspires their next novel, but this may be considered inappropriate in a different industry. Ideally, all S corps should let a CPA handle their tax prep. Between the deductions and the distributions, S corp paperwork can get confusing very quickly. 

List of tax deductions for S corp owners

Every deduction has its own rules, and it’s helpful to know the basics for each category. This section can’t cover everything in detail, but it can give you a baseline to discuss your company and how it files year after year, whether it’s your shareholders or CPA. 

Reasonable salary 

• Owners must pay themselves a reasonable salary based on their earnings. The lower your salary, the less you’ll pay in taxes, but going too low can trigger an IRS audit. 
• S Corps classify salaries as deductible, further reducing the company’s taxable income. A CPA can help you set your salary based on the market expectations for the industry/role. 

Home office 

• If you use part of your home exclusively for business, like a spare room or basement, you can deduct not just the relative portion of your rent/mortgage, but also a share of your utilities and home insurance. 
• Should you be audited, you’ll need clear proof that you use the spaces as a home office, meaning the office can’t be a shared living space or used for any other purpose. 

Health insurance premiums 

• S corp owners who own more than 2% of the business can deduct the cost of health insurance for themselves, their spouse, and any dependents they may have.
• A CPA will typically build the premium into the owner’s wages and then deduct the expense via the owner’s personal return. This is typically a high deduction thanks to average health insurance premiums, so it’s worth discussing the matter with a CPA if you’re confused about how the costs appear on either the company’s or personal returns. 

Retirement plan contributions 

• Eligible retirement plans include 401ks, SEP-IRAs, and SIMPLE IRAs. (Please note that you can not deduct from Roth IRAs or Rollovers.)
• With this benefit, you can both contribute to your retirement future and reduce your taxable income. However, retirement plans set annual contribution limits that you must adhere to. In 2026, the 401(k) employee contribution limit is $24,500, a SEP-IRA allows up to 25% of compensation with a $72,000 cap, and a SIMPLE IRA is capped at a flat $17,000. These limits can change yearly based on inflation, so it’s important to check the current figures before making annual retirement contribution plans

Employee compensation 

• You can deduct the salary, wages, and bonuses paid to all employees. This includes any holiday incentives or other types of cash compensation (e.g., an award for the most successful salesperson). You can also deduct payroll taxes. 

Business insurance 

• All business insurance policies, such as cybersecurity, commercial, or property can be deducted. You can also deduct any employee health insurance premiums. 
• You cannot deduct personal insurance policies unless they’re specifically declared and properly accounted for. For example, you may be able to deduct a portion of your personal car insurance if you use your car for business sometimes, but you cannot deduct it directly on your tax forms. An accountant can help you properly estimate the expenses and then file it correctly so that the S corp reimburses you as a type of employee expense. 

Advertising and marketing

• You can deduct any and all promotional expenses, including website hosting, design services, digital or traditional advertising, CRM software, or social media expenses. 
• Consider all forms of marketing that the S corp may have done before meeting with an accountant, such as sponsorships, contests, swag bags, or educational marketing materials. 

Vehicle expenses 

• You can either deduct the actual expense of your vehicle, including maintenance costs, or you can use the standard IRS mileage rate (which does technically account for some degree of wear and tear). 
• If you use your vehicle for both business and personal, you must keep careful track of the mileage for each, and you must be able to produce the logs in the case of an audit. Many business owners will buy a dedicated business vehicle to avoid having to keep these kinds of careful records. 

Travel expenses 

• You can deduct 100% of most business travel expenses, including hotels, car rentals, taxis/ride services, and flights. However, you can only deduct half of your meal costs on business trips. 
• Trips must be legitimately for business. If you’re mixing any business with personal travel, you must keep careful track of your expenses. 

Business meals 

• Any business-related food, including client dinners and meals while traveling, can be deducted at 50%. 
• You generally cannot deduct entertainment costs. So if you take a client to a dinner theater, you can separate the cost of the meal and deduct it at 50% but you cannot deduct the cost of the show. 

Legal and professional fees 

• You can deduct all professional service fees, including CPA costs, attorney fees, or notary services.
• You can also deduct payments to independent contractors. Please note that starting in 2026, S corps are required to file a 1099-NEC if they pay an independent contractor $2,000 or more in a year, up from the longstanding $600 threshold.
• Keep track of all vendors, partners, or outside companies to ensure that you’re not missing an important deduction. 

Office supplies and equipment 

• Business supplies, including software subscriptions, hardware, standard administrative equipment, and office furniture, are all deductible. 
• If you’re making a larger purchase (e.g., upgrading your whole office to new laptops), you might consider depreciating the expense over time rather than making one huge deduction in a year. This is a matter best discussed with an accountant as it’s often done on a case-by-case basis. 

Association dues and education 

• S corps can deduct any associate dues or education costs, such as trade organizations, licensures, or the costs of continuing education courses. 

Charitable contributions 

• Charitable contributions must be to qualifying nonprofits, and unlike a C corp, an S corp doesn’t deduct these directly on its own return. The contribution instead passes through to each shareholder via Schedule K-1, and the deduction limit applies at the shareholder’s individual level, generally up to 60% of adjusted gross income for cash gifts to public charities, or 30% for appreciated property. Amounts over the limit can be carried forward on the shareholder’s personal return for up to five years.
• Contributions can be cash, assets, or services. So, if you own a roofing company and offer to fix a church’s roof, the value of the labor and supplies can pass through as a deductible contribution, subject to those same shareholder-level limits. A CPA should confirm how this plays out for each shareholder, since the deduction only helps if that shareholder itemizes rather than taking the standard deduction.

Client gifts 

• This deduction includes any business gifts, but you can only deduct $25 per recipient per year.
•  This is often a missed expense because it’s severely capped, but if you have hundreds of recipients, the deductions can certainly add up. 

What S corps cannot deduct

S corps cannot deduct the following expenses:

• Personal expenses, regardless of whether it was paid through a business account or not. 
• Political contributions or financial penalties to government agencies. 
• Commuting costs 

Because it’s common for business owners to misclassify their expenses (e.g., deducting the cost of gas if they live far from their office), this is one of the most common reasons for IRS audits. It’s important to account for your major expenses, but it’s equally important to separate and tally up even the smallest expenses so that you’re not overpaying your taxes. 

The connection between salary and deductions 

Your salary plays a major role in your taxable income and available leftover funds. If you’re pricing your salary too low to avoid heavy taxes, this is not only a warning to IRS officials but it also limits retirement contributions (e.g., a SIMPLE IRA is capped at 25% of your salary).

Whatever your salary and deduction planning strategy is, it’s best reviewed with a CPA. If you have questions along the way, Tailor Brands can help you with forming and maintaining an S corp, so that you’re less likely to mismanage your expenses or filings. 

Conclusion

Regardless of business entity structure, all business owners are entitled to deductions. The difference with an S corp that there’s not only more to keep track of, there are often different rules that apply to each category. Unless you’re a CPA, it’s easy to incorrectly classify or miss expenses altogether, which is why you need a solid tax prep strategy. Entrusting it to a generic software or general bookkeeper can land you in hot water faster than you think. 

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