Being a sole proprietor is one of the simplest ways to start a business. You don’t have to create a separate corporation, issue yourself a paycheck, or maintain a complicated corporate tax structure.
But “simple” doesn’t mean “hands-off” when it comes to taxes.
As a sole proprietor, your business income generally flows directly onto your personal tax return, and you’re responsible for tracking your income, expenses, estimated taxes, and self-employment tax. In most cases, you’ll report your business activity on Schedule C and calculate self-employment tax on Schedule SE. If your net earnings from self-employment are $400 or more, self-employment tax generally applies.
The good news is that sole proprietors have access to a wide range of legitimate deductions and tax-planning strategies. Here are 10 worth knowing about.
1. Don’t Forget Your Startup Costs
Starting a business can get expensive before you ever send your first invoice.
You may have paid for advertising, market research, professional services, supplies, software, or other costs while getting your business off the ground. Certain business startup costs can qualify for a deduction in the year your business begins operating.
Generally, you may elect to deduct up to $5,000 of qualifying startup costs, with that deduction reduced when total startup costs exceed $50,000. Remaining eligible costs generally must be amortized over 180 months.
The important distinction is that not everything you spend before opening the doors automatically qualifies as a startup-cost deduction. The nature of the expense matters, as do the timing and circumstances.
Keep those receipts from the beginning. “I’ll worry about the bookkeeping once I start making money” is a surprisingly expensive philosophy.
2. Look Into the Self-Employed Health Insurance Deduction
One of the biggest advantages available to qualifying self-employed individuals is the self-employed health insurance deduction.
You may be able to deduct premiums you paid for medical, dental, and vision insurance for yourself, your spouse, and your dependents. Qualified long-term care insurance may also qualify, subject to additional rules and limits.
This deduction is generally taken as an adjustment to income rather than as a Schedule C business expense, which means it isn’t dependent on itemizing deductions.
There are eligibility and income limitations, though. For example, the deduction generally can’t exceed the earned income from the business that established the health insurance plan. If you also have access to subsidized coverage through an employer or other source, additional rules may apply.
3. Don’t Leave Business Banking Fees and Interest on the Table
Bank charges may not be the most exciting part of running a business, but they can add up.
Business checking fees, payment-processing fees, wire fees, merchant-account charges, and other ordinary and necessary costs of operating your business may be deductible.
The same principle can apply to interest on money borrowed for business purposes. If you take out a business loan, use a business credit card, or otherwise borrow money to fund legitimate business expenses, the interest may be deductible, subject to the applicable rules.
One important caveat: the tax treatment depends on what you borrowed the money for. Calling something a “business loan” doesn’t magically turn personal expenses into business deductions.
Keeping business and personal accounts separate makes this much easier to document.
4. Take Advantage of the Home Office Deduction
If you regularly work from home, don’t automatically assume you can’t deduct any of your housing costs.
A qualifying home office generally must be used exclusively and regularly for business, with exceptions for certain storage and daycare situations. Your home can qualify as your principal place of business even if you conduct some of your work elsewhere.
There are two ways to calculate the deduction.
The simplified method allows a deduction of $5 per square foot of qualifying business space, up to 300 square feet, for a maximum deduction of $1,500.
The regular method involves calculating the actual business portion of qualifying home expenses. Depending on your circumstances, those expenses can include items such as mortgage interest, rent, utilities, insurance, repairs, and depreciation.
The simplified method is easier, but it isn’t automatically the better choice. If you have a relatively expensive home and a substantial dedicated office, the regular method may produce a larger deduction.
5. Track Business Meals Carefully
Business meals are still deductible, but the rules are more restrictive than they used to be.
In most cases, qualifying business meals are subject to a 50% deduction limit. Generally, you or your employee must be present, the expense must be ordinary and necessary, and the meal can’t be lavish or extravagant under the circumstances. The meal also generally needs to involve a current or potential business contact.
And don’t confuse a business meal with entertainment.
Taking a client to dinner may potentially create a deductible meal expense. Paying for a round of golf with that client generally doesn’t turn the golf outing into a deductible business meal.
Keep the receipt and record who was there and what the business purpose was. A credit-card statement showing “$184 at Restaurant X” isn’t nearly as useful as a contemporaneous record explaining what the expense was for.
6. Track Your Business Mileage and Vehicle Expenses
If you use your personal vehicle for business, you may be able to deduct the business-use portion of your vehicle expenses.
You generally have two methods to consider: the standard mileage method or the actual expense method.
For 2026, the federal business mileage rate is 72.5 cents per mile for January 1 through June 30, and 76 cents per mile beginning July 1. The IRS adjusted the rate midyear in response to increased fuel prices.
Under the actual-expense method, you generally track the business portion of expenses such as fuel, insurance, repairs, maintenance, registration, and depreciation.
Whichever method you use, good records are essential. Keep a mileage log showing the date, destination, business purpose, and miles driven.
And remember: commuting from your home to your regular place of business generally isn’t deductible business mileage.
Also, don’t buy an expensive vehicle simply because someone told you it’s a “tax write-off.” A deduction reduces taxable income; it doesn’t make the vehicle free.
What About an Electric Vehicle?
This is one area where older tax articles are particularly dangerous.
The federal New Clean Vehicle Credit, Previously-Owned Clean Vehicle Credit, and Qualified Commercial Clean Vehicle Credit are no longer available for vehicles acquired after September 30, 2025. Vehicles acquired on or before that date may still qualify if the applicable requirements are met.
So if you’re a sole proprietor considering an EV in 2026, don’t assume that the old $7,500 federal credit is still available.
There may still be other tax considerations surrounding the business use, depreciation, and operating costs of an EV, but those are separate from the expired clean-vehicle credits.
7. Deduct Professional Development and Business Subscriptions
Running a business often means constantly paying to keep your knowledge and tools current.
Education and professional development expenses may be deductible when they maintain or improve skills related to your existing business or help you meet continuing education requirements.
That can include qualifying courses, conferences, professional publications, industry books, and training.
The key is that the expense needs to have a legitimate connection to your existing trade or business. You generally can’t turn the cost of learning an entirely new profession into a current business deduction simply because you’d like to pursue it someday.
The same principle applies to software and subscriptions. If you pay for accounting software, project-management tools, cloud storage, industry databases, design software, AI tools, or other services that you genuinely use in your business, make sure those expenses are being tracked.
8. Use a Retirement Plan to Reduce Your Taxable Income
Sole proprietors don’t have to give up employer-sponsored retirement benefits simply because they don’t have an employer.
Depending on your circumstances, you may be able to establish a Solo 401(k), SEP IRA, SIMPLE IRA, or another qualified retirement plan.
For 2026, the employee elective-deferral limit for a 401(k) is $24,500, while SEP contributions can generally be up to the lesser of 25% of compensation or $72,000, subject to the applicable rules.
A Solo 401(k) can be particularly useful because a qualifying owner can potentially contribute in both an employee and employer capacity, subject to the overall contribution limits.
Retirement planning can therefore do more than prepare you for the future. It can also be an important part of your current-year tax strategy.
Just don’t wait until April to think about it. Some retirement-plan contributions and establishment requirements have specific timing rules.
9. Don’t Miss the Qualified Business Income Deduction
This is a big one for many sole proprietors.
Eligible sole proprietors may qualify for the Qualified Business Income (QBI) deduction, which can allow an individual to deduct up to 20% of qualified business income from an eligible business. The deduction is subject to various limitations based on taxable income, the type of business, and other factors.
And there’s an important update for 2026: the One Big Beautiful Bill Act made the QBI deduction permanent for qualifying active businesses rather than allowing it to expire after 2025. The law also expanded the phase-in ranges and added a minimum deduction for certain taxpayers with at least $1,000 of qualified business income from an active business.
The QBI deduction is taken on your individual return rather than as a Schedule C business expense. It also isn’t simply “20% off your business income.” The calculation can get considerably more complicated for higher-income taxpayers and certain service businesses.
If you’re making significant money as a sole proprietor, this is something worth discussing with your CPA rather than assuming you’ll automatically receive the full 20%.
10. Plan for Estimated Taxes and Major Equipment Purchases
There’s more to tax planning than finding deductions after December 31.
As a sole proprietor, you generally don’t have an employer withholding federal income and payroll taxes from your business income. If you expect to owe enough tax, you may need to make quarterly estimated tax payments during the year.
That means your tax planning should happen throughout the year.
And if your business is profitable enough to make significant purchases, pay attention to the current depreciation rules.
Under current law, qualifying property acquired after January 19, 2025 may be eligible for 100% additional first-year depreciation, making it possible to deduct the full cost of many qualifying business assets in the year they’re placed in service. Section 179 limits have also increased, with the 2025 maximum deduction set at $2.5 million before the applicable phaseout.
That doesn’t mean you should buy equipment simply because it creates a deduction.
If you need a new computer, machinery, furniture, vehicle, or other business asset anyway, however, the timing of that purchase can become an important tax-planning decision.
Keep Good Records From Day One
Most sole-proprietor tax problems aren’t caused by a lack of available deductions. They’re caused by poor records.
Your bookkeeping should make it possible to answer basic questions such as:
- How much did my business actually make?
- What did I spend to earn that money?
- Which expenses were personal and which were business?
- How much did I drive for business?
- How much have I paid toward estimated taxes?
- Do I have receipts and documentation to support my deductions?
Don’t wait until tax season to reconstruct an entire year’s worth of transactions from your credit-card statements.
A separate business bank account, consistent bookkeeping, and a system for saving receipts can make tax preparation dramatically easier—and can make it much easier to see whether your business is actually profitable.
Should a Sole Proprietor Become an S Corporation?
Once your business becomes consistently profitable, you may eventually want to consider whether an S corporation election makes sense.
But this isn’t a decision you should make simply because you heard that S corporations “save taxes.”
A sole proprietor generally pays self-employment tax on net earnings from the business. An S corporation, by contrast, generally requires an owner who works in the business to take reasonable compensation through payroll, while remaining profits may not be subject to self-employment tax in the same way. That can create tax savings in the right circumstances—but it also introduces payroll, bookkeeping, tax-return, and compliance costs.
The question isn’t “Should every profitable sole proprietor become an S corp?”
It’s “At my level of profit, does the potential tax savings justify the additional administrative costs and complexity?”
For some business owners, the answer is yes. For others, staying a sole proprietor is simpler and perfectly appropriate.
The Bottom Line
Being a sole proprietor doesn’t mean you have to pay more tax than necessary. It means you’re responsible for understanding the deductions, retirement options, tax credits, and planning strategies available to you.
The biggest opportunities usually aren’t obscure loopholes. They’re the things business owners overlook because they’re focused on actually running the business.
Track your expenses. Separate business and personal spending. Keep a mileage log. Don’t ignore estimated taxes. Look at retirement contributions and the QBI deduction. And when you’re considering a major purchase or a change in business structure, do the tax planning before you make the decision—not after.
Tax laws change frequently, and what makes sense for a sole proprietor earning $50,000 isn’t necessarily what makes sense for one earning $500,000.
If your business is growing, that’s a good problem to have. Just make sure your tax strategy grows with it.
General Information Note: This article provides general information and should not be construed as definitive legal or tax advice. Tax laws and individual circumstances change frequently. Consult a qualified tax professional regarding your specific situation.