Every year, taxpayers pay more than necessary simply because they miss legitimate deductions. Whether you file as an individual, run a small business, or work as an independent contractor, the list of qualifying write-offs is longer than most people realize — and 2026 brings several meaningful changes worth knowing before you file. At Lewis.cpa, our income tax preparation experts cover the most commonly overlooked deductions below.
Home Office Expenses
Many self-employed individuals skip this deduction out of fear that it will attract IRS scrutiny, but that perception is largely based on outdated assumptions. The home office deduction is straightforward when the eligibility rules are met, and it applies to a significant portion of self-employed professionals.
To qualify, the space must be used regularly and exclusively for business — a dedicated room or defined area used only for work, not a kitchen table that doubles as a desk. Eligible taxpayers can choose between two methods:
- Simplified method: $5 per square foot of dedicated space, up to $1,500.
- Actual expense method: a proportional share of rent or mortgage interest, utilities, homeowners insurance, property taxes, and repairs related to the office area.
For taxpayers who rent or have a mortgage in a higher-cost area, the actual expense method often results in a larger deduction. IRS Publication 587 covers eligibility requirements and calculation methods in full.
Who benefits most:
- Freelancers and independent contractors
- Consultants and remote service providers
- Real estate professionals
- Online business owners
Vehicle Mileage and Business Transportation
Mileage is one of the most commonly overlooked deductions for self-employed taxpayers and small business owners. Because it requires consistent recordkeeping throughout the year, many people don’t begin tracking until they’ve already missed a significant portion of their deductible miles.
For 2026, the IRS standard mileage rate for business use is 72.5 cents per mile, up from 70 cents in 2025. Qualifying trips include:
- Client meetings and site visits
- Travel between business locations
- Business errands
- Trips from a qualified home office to customer locations
Commuting between home and a regular workplace does not qualify.
Beyond mileage, many taxpayers forget to track parking fees and tolls separately; these are deductible in addition to the standard rate. For those with high vehicle costs, the actual expense method may produce a larger deduction than the standard rate. IRS Publication 463 outlines both approaches and recordkeeping requirements.
State and Local Tax (SALT) Deduction
This is one of the biggest changes for 2026 and one that many taxpayers, especially Illinois homeowners, aren’t yet accounting for in their planning.
Under the One Big Beautiful Bill Act, the SALT deduction cap increased from $10,000 to $40,400 for 2026 (up from $40,000 in 2025, indexed at 1% annually through 2029). For married couples filing separately, the cap is $20,200.
Taxpayers who itemize may be able to deduct state and local income taxes, property taxes, and certain personal property taxes as part of this deduction. For Illinois residents with significant property tax bills and state income tax, the higher cap may make itemizing worthwhile when combined with mortgage interest and charitable contributions.
Note: the cap phases down for taxpayers with modified adjusted gross income above $505,000 in 2026, reducing by 30 cents for every dollar over that threshold, but not below $10,000. The higher cap is temporary and reverts to $10,000 in 2030.
Health Insurance Premiums for Self-Employed Individuals
Self-employed taxpayers who pay for their own health coverage may be able to deduct the full cost of their premiums without itemizing, reducing adjusted gross income directly.
Eligible coverage includes:
- Medical and dental insurance
- Long-term care insurance (subject to age-based limits)
- Qualified family coverage for a spouse, dependents, and children under 27
This deduction isn’t available for any month the taxpayer was eligible to enroll in a subsidized employer-sponsored plan, including through a spouse's employer. Because the eligibility rules can be complex, it’s worth reviewing your situation with a tax professional.
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Retirement Plan Contributions
Retirement contributions reduce taxable income dollar for dollar, but many business owners either don't contribute or don't maximize available limits before the filing deadline.
2026 contribution limits:
- SEP IRA: up to 25% of net self-employment income, maximum $70,000.
- Solo 401(k): up to $70,000 combined employee and employer contributions ($77,500 with catch-up for those 50 and older).
- SIMPLE IRA: up to $16,500 employee deferral ($20,000 with catch-up).
- Traditional IRA: up to $7,000 ($8,000 with catch-up), deductibility depends on income and workplace plan coverage.
SEP IRA contributions can be made up until the tax filing deadline, including extensions, which makes them useful for year-end tax planning that extends beyond December 31.
Section 179 Expensing and Bonus Depreciation
Businesses that purchased equipment, furniture, vehicles, or technology in 2026 may be able to deduct the full cost in the year the asset was placed in service rather than spreading the deduction over several years.
For 2026, the Section 179 expensing limit is $1,210,000, with a phase-out beginning at $3,050,000 in total equipment purchases. Qualified assets include computers, machinery, office furniture, and certain vehicles used for business.
Bonus depreciation — restored to 100% under the One Big Beautiful Bill Act for property acquired and placed in service after January 19, 2025 — allows businesses to immediately expense the full cost of qualifying property in the first year. Many taxpayers either aren’t aware of the higher limits or don’t have the documentation needed to support the deduction when it’s time to file.
Qualified Business Income (QBI) Deduction
Eligible business owners may deduct up to 20% of qualified business income under Section 199A — one of the most significant deductions available to pass-through entities, and one of the most frequently miscalculated.
Business structures that may qualify include sole proprietorships, partnerships, S corporations, and certain LLCs. Income limitations, the type of business, and W-2 wages paid all factors into the final deduction amount.
Many taxpayers either miss this deduction entirely or apply it incorrectly. The calculation involves multiple inputs and phase-out rules that vary by income level and business type, making it worth reviewing carefully with a CPA.
Business Insurance Premiums
Premiums paid for insurance that protects a business are generally fully deductible, and this is a category many owners don't think to track separately from other operating expenses.
Qualifying policies typically include:
- General liability insurance
- Professional liability and errors & omissions coverage
- Workers' compensation
- Commercial auto insurance
- Cyber liability insurance
- Business interruption insurance
Because insurance is often renewed annually and billed automatically, the expense is easy to overlook at tax time without consistent year-round recordkeeping.
Education and Professional Development
Educational expenses that help you maintain or improve skills used in your current business or profession may qualify as a deductible business expense. The key distinction is that the education must relate to your existing work, not qualify you for a new one.
Deductible expenses may include:
- Industry certifications and license renewal fees
- Continuing education courses
- Professional seminars and conferences
- Business-related subscriptions to industry publications and research tools
A graphic designer taking an advanced design course qualifies. The same designer taking law school courses to switch careers does not. Because professional development expenses tend to occur throughout the year and often feel like routine costs, they often go unclaimed at filing time.
Business Software and Subscriptions
Software subscriptions billed monthly are easy to forget because each charge seems small. Cumulatively, they can create a meaningful deduction.
Common qualifying subscriptions include accounting and bookkeeping software, project management tools, CRM platforms, cloud storage, design software, cybersecurity tools, and industry-specific applications. The cost is generally deductible in the year it's paid.
Keeping a simple log of recurring charges, or reviewing bank and credit card statements once a year, is usually all that's needed to capture this category.
Phone and Internet Expenses
Many self-employed taxpayers and business owners use their phone and internet service for business purposes, but never claim the business-use portion as a deductible expense.
The deductible amount should reflect the actual percentage of business use. A reasonable estimate, consistently applied and properly documented, is generally acceptable. Virtual phone systems and business communication apps used exclusively for work can be deducted in full.
Meals with a Business Purpose
Business meal expenses are generally 50% deductible when there is a clear business purpose, and the taxpayer is present. Common qualifying situations include meals with clients, meals during business travel, and working meals with employees where business is the primary purpose.
Meals that are mainly social or don’t involve a clear business purpose generally don’t qualify for the deduction. Keeping brief notes on who was present and what was discussed provides adequate documentation under IRS Publication 463.
Charitable Contributions
Most taxpayers know charitable contributions are deductible when itemizing — but fewer know that 2026 brings a new option for those who don't itemize.
Starting in 2026, taxpayers who take the standard deduction can deduct up to $1,000 in qualifying charitable contributions ($2,000 for married filing jointly) above the line. Eligible contributions must be cash donations to qualified 501(c)(3) organizations.
For itemizers, commonly overlooked contributions include donated household goods and clothing (valued at fair market value), certain out-of-pocket volunteer expenses, and mileage driven for qualifying charitable purposes at 14 cents per mile. Receipts and written acknowledgment letters from the organization are required for gifts of $250 or more.
Student Loan Interest
Many taxpayers miss this deduction because they believe it’s only available to recent graduates or that they must itemize to claim it. However, the student loan interest deduction is an above-the-line deduction, available regardless of whether you itemize, and applies to any qualifying loan still in repayment.
Up to $2,500 in qualifying interest can be deducted annually, subject to income phase-outs. For 2026, the deduction phases out starting at $85,000 MAGI for single filers and $175,000 for married filing jointly.
Child and Dependent Care
Families focused on income deductions often miss credit-based benefits that can reduce tax owed directly, not just taxable income.
The Child and Dependent Care Credit applies to qualifying expenses for childcare, daycare, and before- or after-school programs for children under 13 while the taxpayer works or looks for work. The credit is calculated as a percentage of qualifying expenses up to $3,000 for one qualifying person or $6,000 for two or more.
Separately, if your employer offers a Dependent Care FSA, you may be able to contribute up to $5,000 per household pre-tax, which reduces taxable income. This benefit interacts differently from the credit and should be reviewed with a tax professional.
Recordkeeping Makes or Breaks These Deductions
A deduction you can't document is a deduction you can't claim. The IRS doesn't require perfect records, but it requires records that are contemporaneous, consistent, and specific enough to substantiate the expense.
Practical habits that protect your deductions:
- Save receipts digitally as expenses occur, not at year-end
- Use a dedicated mileage tracking app or maintain a written log with dates, destinations, and business purpose
- Keep business and personal accounts fully separate
- Retain W-2s, 1099s, invoices, and brokerage statements for at least three years from the filing date
- Review bank and credit card statements quarterly to catch recurring deductible expenses
Waiting until April to reconstruct a full year of expenses often results in missed or incomplete deductions. A few minutes of organization each week avoids that loss entirely.
How Lewis.cpa Helps Clients Find What They're Missing
Missed deductions don't show up on your tax bill — they just disappear. Lewis.cpa works with individuals, self-employed professionals, and business owners to identify legitimate write-offs, improve tax planning, and avoid leaving money behind every year. Contact us today to review your tax situation with our team.
