Morning: Small Business Tax Tips (New Haven)

New Haven, Connecticut | Jose's Tax Service | August 20, 2026

For New Haven small business owners, August is an important planning period. The third federal and Connecticut estimated tax installments are due September 15, 2026. The payment should reflect current income, documented deductions, and expected fourth-quarter activity.

Review your home office, vehicle use, and business-use records now. Incomplete documentation can reduce an otherwise valid deduction. It can also delay tax preparation and create problems during an Internal Revenue Service (IRS) examination.

Use the following Q3 and Q4 planning checklist.

Review Your Home Office Deduction Eligibility!

A home office deduction is not automatic. The space must meet specific federal requirements.

Under IRS Publication 587, Business Use of Your Home, you generally must use a specific area of your home:

• Exclusively for business.
• Regularly for business.
• As your principal place of business, or
• As a place where you regularly meet or deal with clients, customers, or patients in the normal course of business.

A qualifying office does not need to be a separate room. It can be a separately identifiable portion of a room. However, personal use of that same area may disqualify the space.

For example, a desk in a family room may not qualify if the area is regularly used for personal activities. A dedicated office, studio, or workshop used only for business is more likely to satisfy the exclusive-use requirement.

If your home office is your principal place of business, transportation from that office to another work location in the same business may qualify as business transportation. This can be important for consultants, contractors, designers, service providers, and other mobile professionals serving clients throughout New Haven County.

Measure and Document the Space!

Complete these steps before year-end:

1. Measure the business area. Record the length and width.
2. Measure or confirm the total home area.
3. Calculate the business-use percentage. Divide business square footage by total home square footage.
4. Photograph the office. Show the desk, equipment, filing system, and business materials.
5. Record when business use began. This is relevant if the office was created or expanded during 2026.
6. Separate direct and indirect expenses.

Direct expenses benefit only the business area. Examples may include painting or repairs limited to the office.

Indirect expenses benefit the entire home. Examples may include:

• Rent.
• Mortgage interest.
• Real estate taxes.
• Utilities.
• Homeowners or renters insurance.
• General repairs and maintenance.
• Security services.

Under the regular method, a self-employed taxpayer filing Schedule C (Form 1040), Profit or Loss From Business, generally uses Form 8829, Expenses for Business Use of Your Home. The deduction is subject to income limitations. Unused expenses may carry forward when the regular method is used.

The simplified method may be available instead. It generally uses a prescribed rate of $5 per square foot, with a maximum of 300 square feet. This produces a maximum simplified deduction of $1,500, subject to applicable limitations. The simplified method does not require Form 8829, but the exclusive and regular use requirements still apply.

Warning: Do not claim a home office deduction based only on having a laptop at home. The area, business purpose, regular use, and supporting records should be reviewed before the deduction is calculated.

Track Business Vehicle Use Precisely!

Vehicle deductions require more than an annual estimate. Maintain a contemporaneous mileage log throughout the year.

For 2026, the IRS standard mileage rates are:

• 72.5 cents per mile for business miles driven from January 1 through June 30, 2026.
• 76 cents per mile for business miles driven from July 1 through December 31, 2026.

Review the current IRS Standard Mileage Rates before preparing your final return.

The standard mileage method generally replaces most actual vehicle operating costs for the same miles. You generally cannot deduct gasoline, repairs, insurance, depreciation, or lease payments separately for the same vehicle under that method. Business-related parking fees and tolls may generally be considered separately.

The alternative is the actual expense method. This may include:

• Gasoline and oil.
• Repairs and maintenance.
• Insurance.
• Registration fees.
• Lease payments.
• Depreciation.
• Tires.
• Business-related parking and tolls.

If you use the actual expense method, allocate expenses between business and personal use. The allocation should be supported by total miles and business miles.

Keep a Complete Mileage Log!

For each business trip, enter:

1. Date.
2. Starting point.
3. Destination or service area.
4. Business purpose.
5. Beginning and ending odometer readings, or trip miles.
6. Parking fees and tolls.
7. Whether the trip was business, personal, or commuting.

A New Haven contractor may record a trip from a qualifying home office to a client location in Hamden. A consultant may record a client meeting in downtown New Haven. A retailer may record a trip to collect inventory or deliver an order.

Do not record only “business” as the purpose. Enter a specific description, such as “client consultation,” “equipment pickup,” “supplier meeting,” or “delivery to customer.”

Commuting remains a separate issue. Travel between a residence and a regular place of work is generally personal commuting. A qualifying home office may change the treatment of travel between the home office and another business location. Review the facts of each arrangement before claiming the mileage.

Preserve Business-Use Documentation!

Deductions should be supported by records that establish the amount, date, place, and business purpose of the expense.

Use a consistent digital or paper filing system. Organize records into these categories:

• Home office: measurements, photographs, lease or mortgage records, utility bills, insurance statements, and repair invoices.
• Vehicle: mileage log, odometer readings, title or lease documents, registration, insurance, repair records, and parking receipts.
• Equipment: purchase invoices, financing records, placed-in-service dates, and business-use percentages.
• Professional services: invoices for legal, accounting, consulting, and tax planning services.
• Communications: separate business phone lines, internet records, and business-related software subscriptions.

IRS Publication 463, Travel, Gift, and Car Expenses, states that records should be kept at or near the time of the expense or business use. A record prepared months later may be less reliable.

Do not rely on bank statements alone. A bank statement can show that money was paid. It may not establish the business purpose. Add an invoice, receipt, written explanation, or other supporting document.

Maintain records for the period required by federal and Connecticut tax law. The IRS commonly refers to a three-year period after filing, but longer retention may be necessary for property basis, depreciation, vehicle recovery periods, amended returns, or other circumstances.

Prepare for the September 15 Deadline!

Self-employed individuals generally use Form 1040-ES, Estimated Tax for Individuals, to calculate and pay federal estimated tax. The third 2026 installment is due Tuesday, September 15, 2026.

The IRS explains that estimated tax applies to income not subject to withholding, including self-employment income. Use the current Form 1040-ES information page and review the applicable worksheet before making the payment.

Connecticut estimated income tax is generally reported using Form CT-1040ES, Estimated Connecticut Income Tax Payment Coupon for Individuals. The Connecticut Department of Revenue Services lists September 15, 2026 as the third installment due date for calendar-year taxpayers.

Review the official Connecticut resident income tax and estimated payment guidance. Connecticut taxpayers may also pay electronically through myconneCT.

Before submitting the September payment:

1. Update gross business income through August 31.
2. Enter documented home office expenses.
3. Update business mileage through the current date.
4. Separate business and personal vehicle expenses.
5. Estimate September through December revenue.
6. Review withholding, prior estimates, and applicable credits.
7. Calculate both federal and Connecticut obligations.
8. Schedule the payments electronically or prepare the required vouchers.
9. Save payment confirmations with your tax records.

A valid deduction may reduce taxable income and estimated tax. However, deductions should not be created solely to reduce a payment. Claim only expenses that are ordinary, necessary, properly allocated, and adequately documented.

Complete a Q4 Tax Strategy Review!

After the September payment, use the final quarter to improve the 2026 filing position.

Review whether you should:

• Purchase necessary equipment before year-end.
• Delay or accelerate revenue based on legitimate business considerations.
• Update retirement plan contributions.
• Reconcile business and personal accounts.
• Confirm contractor and payroll records.
• Review vehicle business-use percentages.
• Preserve receipts for year-end purchases.
• Schedule a year-end tax planning consultation.

Do not purchase property solely for a deduction. A deduction does not eliminate the cost. Evaluate cash flow, business need, financing, depreciation, and expected taxable income before committing funds.

Jose’s Tax Service provides personalized tax preparation and year-round planning for New Haven individuals and small business owners. Schedule a consultation through the Jose’s Tax Service website or request a tax quote through the online tax quote page.

Practical reminder: Complete your record review before September 15, 2026. Missing documentation can reduce deductions, increase the balance due, and may lead to penalties or delayed processing.

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