5 Small Business Tax Deductions New Haven Owners Overlook (And How to Claim Them)

New Haven, Connecticut : Jose’s Tax Service : August 22, 2026

Late August is an appropriate time to review your 2026 business deductions. Year-end decisions are approaching. Equipment purchases, retirement contributions, mileage records, and professional fees should be reviewed before December 31.

A deduction reduces taxable income. It does not provide a dollar-for-dollar tax reduction. Each expense must be properly connected to the business, correctly classified, and supported by reliable records.

Use the following checklist to identify deductions that New Haven sole proprietors, independent professionals, contractors, and small business owners may overlook.

1. Claim the Home Office Deduction Correctly!

A home office may qualify when it is used regularly and exclusively for business. The space generally must also be the principal place of business, a location where administrative or management activities are conducted, or a place where clients or customers are regularly met.

A kitchen table used for both personal and business purposes generally does not satisfy the exclusive-use requirement. A dedicated room, portion of a room, or clearly defined workspace may qualify if the applicable tests are met.

You may calculate the deduction using one of two methods:

1. Simplified method: Multiply eligible business-use square footage by $5 per square foot, subject to a maximum of 300 square feet and a maximum deduction of $1,500.
2. Regular method: Allocate eligible actual expenses based on the percentage of the home used for business.

Under the regular method, expenses may include the business-use share of:

• Rent or qualifying mortgage interest.
• Property taxes.
• Homeowners or renters insurance.
• Electricity, heat, water, and internet.
• General repairs and maintenance.
• Depreciation for eligible homeowners.
• Direct repairs made only to the office area.

The regular method is reported using Form 8829, Expenses for Business Use of Your Home, when applicable. The deduction generally flows to Schedule C (Form 1040), Profit or Loss From Business, for a qualifying sole proprietor.

Action steps:

• Measure the dedicated business area.
• Record the total square footage of the residence.
• Photograph or diagram the workspace.
• Retain rent statements, utility bills, insurance records, and repair invoices.
• Compare the simplified and regular methods before filing.

Review IRS Topic No. 509, Business Use of Home and Publication 587, Business Use of Your Home for official requirements.

Reminder: A home office deduction may be limited by business income. Unsupported personal expenses may be disallowed and can lead to additional tax.

2. Track Vehicle Mileage and Business Auto Costs!

New Haven owners often use a personal vehicle for client visits, supply purchases, temporary work locations, bank deposits, and other business errands. Those miles should not be lost in a general personal mileage total.

For 2026, the IRS business standard mileage rate is:

• 72.5 cents per mile for business miles driven from January 1 through June 30.
• 76 cents per mile for business miles driven from July 1 through December 31, based on later IRS guidance.

Check the IRS Standard Mileage Rates page for the applicable rate and current notices.

Alternatively, you may use the actual-expense method. This method generally allocates the business-use percentage of:

• Fuel and oil.
• Repairs and maintenance.
• Tires.
• Insurance.
• Registration and license fees.
• Lease payments.
• Depreciation for an owned vehicle.

Do not deduct ordinary commuting between your home and a regular place of business. Business travel to clients, temporary work locations, supply vendors, and other business destinations may qualify, subject to the applicable rules.

Action steps:

1. Record the date of each trip.
2. Enter the starting and ending locations.
3. State the business purpose.
4. Record the miles driven.
5. Keep receipts for tolls, parking, and actual vehicle expenses.
6. Separate commuting, personal, and business use.

Use IRS Publication 463, Travel, Gift, and Car Expenses for recordkeeping and vehicle guidance.

Warning: Reconstructing a full-year mileage log from memory is unreliable. Missing dates, destinations, or business purposes can delay preparation and weaken the deduction during an IRS examination.

3. Review Equipment Purchases for Section 179!

Equipment purchased during the year may be eligible for immediate expensing under Section 179 rather than standard depreciation over several years.

Qualifying property may include:

• Computers and technology.
• Machinery and tools.
• Office equipment.
• Furniture.
• Certain off-the-shelf software.
• Some business vehicles, subject to special limitations.

The property generally must be purchased for business use and placed in service during the tax year. “Placed in service” means the equipment is ready and available for its intended business use. Buying an item in December is not enough if it is not operational until the following year.

For tax years beginning in 2026, the Section 179 maximum deduction is $2,560,000. The limit is reduced when the cost of qualifying property placed in service exceeds $4,090,000. The deduction is also generally limited by taxable business income.

The election is reported on Form 4562, Depreciation and Amortization. Remaining basis may be subject to regular depreciation or other applicable depreciation provisions.

Action steps:

• List every equipment purchase made in 2026.
• Retain the invoice, payment record, and delivery documentation.
• Record the date the asset became operational.
• Calculate business-use percentage for mixed-use property.
• Identify financing terms and trade-in values.
• Compare Section 179 with regular depreciation before making an election.

The IRS Publication 946, How To Depreciate Property provides official information about Section 179 and depreciation.

Reminder: Do not treat a capital asset as an ordinary supply without review. Incorrect classification may result in an overstated deduction or an amended return.

4. Plan Deductible Retirement Contributions Before Year-End!

Retirement contributions can support long-term financial planning while creating a potential business deduction. The correct treatment depends on the plan, business structure, owner compensation, and employee participation.

Common plans include:

• SEP IRA (Simplified Employee Pension): Employer contributions may be based on eligible compensation and are subject to annual limits.
• SIMPLE IRA (Savings Incentive Match Plan for Employees): Employee salary deferrals and required employer contributions apply.
• One-participant 401(k): A business owner may make employee elective deferrals and employer contributions when eligible.
• Defined benefit plan: Potentially larger deductions may be available, but actuarial and administrative requirements apply.

For 2026, the IRS has announced a $24,500 elective deferral limit for many 401(k) plans, subject to applicable catch-up provisions. The 2026 SEP IRA limit is generally $72,000, subject to the compensation formula and other requirements. SIMPLE IRA limits also apply and should be verified against current IRS guidance.

Do not assume that every contribution deadline is December 31. Some plans must be established by year-end. Other contributions may be made by the business tax return due date, including extensions, depending on the plan and the taxpayer’s structure.

Action steps:

1. Estimate 2026 net business income.
2. Review owner compensation and employee eligibility.
3. Confirm whether a plan already exists.
4. Ask a qualified retirement plan professional about establishment deadlines.
5. Coordinate contributions with estimated tax payments.
6. Retain plan documents and contribution confirmations.

Review the IRS Retirement Plans for Small Businesses page and Publication 560, Retirement Plans for Small Business.

Warning: A contribution may be deductible only when the plan is properly established and operated. Errors involving employee eligibility or required contributions can create compliance issues.

5. Deduct Professional Services and Business Support!

Professional fees are frequently paid but not consistently recorded. Legal, accounting, bookkeeping, payroll, consulting, and tax preparation expenses may be deductible when they are ordinary, necessary, and directly related to the business.

Examples include:

• Business tax preparation and accounting fees.
• Bookkeeping and financial statement services.
• Payroll processing and payroll compliance support.
• Legal fees for contracts, entity matters, and business disputes.
• Consulting and advisory services.
• Business license and compliance assistance.
• Technology, cybersecurity, and operational consulting.

Separate personal and business services. A fee for preparing a personal income tax return is not automatically a business deduction. Ask your tax professional to identify the business portion when an invoice covers multiple services.

New Haven owners should also retain documentation for services provided by attorneys, accountants, marketing professionals, contractors, and consultants. Payment records may not fully establish the business purpose. Keep the engagement letter, invoice, service description, and proof of payment.

Action steps:

• Request itemized invoices.
• Record the business purpose.
• Separate personal services from business services.
• Track contractor payments throughout the year.
• Review whether Form 1099-NEC reporting may apply.
• Reconcile professional fees to your bookkeeping records.

The IRS Publication 535, Business Expenses explains the ordinary-and-necessary standard and related expense rules.

Complete This Late-August Deduction Review!

Use the remaining months of 2026 to prepare before filing season:

1. Reconcile business bank and credit card accounts through July.
2. Update your mileage log through August.
3. Measure and document your home office.
4. Review equipment purchases and in-service dates.
5. Project retirement contribution capacity.
6. Collect contracts and invoices for professional services.
7. Review federal and Connecticut estimated tax payments.
8. Schedule a year-end planning appointment before major purchases or distributions.

The next 2026 Connecticut estimated tax installment is generally due September 15, 2026, subject to the taxpayer’s specific obligations. Use the official Connecticut Department of Revenue Services estimated tax resources for current instructions.

Jose’s Tax Service provides personalized tax preparation, bookkeeping, federal and Connecticut e-filing, and year-round planning for New Haven individuals and small businesses. Visit Jose’s Tax Service or review the small business tax planning guide to organize your next review.

This article provides general educational information. Eligibility, limits, deadlines, and reporting requirements depend on your business structure, accounting method, income, records, and current federal and Connecticut law. Confirm your position with a qualified tax professional before filing or making a major tax decision.

Category: Tax Planning | Tags: small business tax, New Haven business, deductions, tax strategy