Morning: Small Business Tax Tips (New Haven): The Accountable Plan: How New Haven S-Corp Owners Reimburse Home Office, Mileage, and Health Costs Before December 31

NEW HAVEN, CONNECTICUT, JOSE'S TAX SERVICE, OCTOBER 10, 2026.

This is the 8:00 AM installment of Morning: Small Business Tax Tips (New Haven). For New Haven S corporation owners, year-end is a practical time to formalize how the corporation reimburses employees for business expenses. A written accountable plan, accurate records, and timely payments can help keep qualifying reimbursements separate from taxable wages.

An S corporation is a separate legal entity. When an owner performs services for the corporation, that owner may also be its employee. The corporation should therefore document and process business reimbursements as employer payments, rather than casually treating personal spending as a business expense.

What Is an Accountable Plan?

Treasury Regulation Section 1.62-2 defines the requirements for an accountable reimbursement arrangement. When the rules are met, qualifying reimbursements are generally excluded from the employee’s gross income, are not reported as wages on Form W-2, and are not subject to federal withholding or employment taxes.

The arrangement must meet all three requirements:

1. Business connection. Reimburse only expenses that are allowable business expenses and are incurred while performing services for the corporation.
2. Timely substantiation. Require the employee to document the expense, including its amount and business purpose, within a reasonable period.
3. Return of excess advances. Require the employee to return any advance or payment greater than the substantiated expense.

The regulation’s fixed-date safe harbors treat an expense as substantiated within a reasonable period when it is documented within 60 days after it is paid or incurred. An excess advance is treated as returned within a reasonable period when it is repaid within 120 days after the expense is paid or incurred. These are safe harbors, not permission to ignore recordkeeping or routinely overpay expenses.

Review the full text of Treasury Regulation Section 1.62-2. If the arrangement fails the rules, payments may be treated as made under a nonaccountable plan. They are then included in the owner-employee’s gross income, reported as wages on Form W-2, and subject to applicable withholding and employment taxes. A late or unrepaid excess amount can also create taxable wages.

Which Expenses Can Be Reimbursed?

An accountable plan can cover properly documented expenses incurred for the corporation’s business. Common categories include:

• Home office costs. Reimburse the corporation’s share of eligible actual expenses when the workspace qualifies under the applicable rules. The employee’s use generally must be regular and exclusive, and an employee’s home office generally must meet the employer-convenience requirement.
• Business mileage. Reimburse documented business miles using an eligible method, such as the applicable standard mileage rate.
• Business travel. Record the amount, date, location, and business purpose. Retain receipts where required.
• Professional dues and subscriptions. Document the organization or publication, cost, and business relevance.

For an S corporation owner-employee, do not simply reimburse a home office at the simplified-method rate. The $5 per square foot, up to 300 square feet, simplified method is a tax calculation available to eligible taxpayers, generally reported on Schedule C. It is not an automatic S corporation reimbursement amount. For an accountable-plan reimbursement, calculate and substantiate eligible actual costs and the business-use allocation.

Form 8829, Expenses for Business Use of Your Home, is used by eligible Schedule C filers to calculate actual home-office expenses. It is not the form used to calculate an S corporation employee’s accountable-plan reimbursement. For background, see the IRS guidance on the simplified home office option and Publication 587, Business Use of Your Home. Keep allocation records, such as office and home square footage, bills, receipts, and the calculation used. Do not claim the same costs again on an individual return.

Use the Correct 2026 Mileage Rates!

The 2026 business standard mileage rate changed during the year. Use the correct rate for the applicable period:

• January 1 through June 30, 2026: 72.5 cents per business mile.
• July 1 through December 31, 2026: 76 cents per business mile.

Keep the mileage log split into these two periods. For each trip, record the date, destination, business purpose, and miles driven. The revised second-half rate is addressed in IRS Announcement 2026-11. The IRS also provides its 2026 standard mileage rate information.

Do not use a monthly car allowance without reconciling it to business mileage. A flat payment that is not tied to substantiated expenses may be treated as wages.

Treat More-Than-2-Percent Shareholder Health Insurance Separately!

Health insurance for an S corporation shareholder-employee who owns more than 2 percent of the stock has a special federal reporting process. Do not treat these premiums as a tax-free accountable-plan reimbursement.

When the corporation pays or reimburses qualifying health insurance premiums, it generally reports the amount as wages in Box 1 of Form W-2, but not in Boxes 3 and 5, under the applicable rules. The premiums are subject to federal income tax withholding. The shareholder may be eligible to claim the self-employed health insurance deduction on the individual return, subject to the requirements of Internal Revenue Code Section 162(l), including restrictions involving eligibility for another subsidized employer plan.

See the IRS page on S corporation compensation and medical insurance issues. For additional detail on claiming the deduction, review our earlier coverage of the self-employed health insurance deduction. Because health-plan arrangements can raise additional compliance questions, have the corporation’s payment and payroll treatment reviewed before processing.

Connecticut Payroll and Reporting Considerations!

Connecticut generally follows federal wage treatment for withholding purposes. A properly substantiated accountable-plan reimbursement that is not federal wages generally is not subject to Connecticut income tax withholding and is not included as Connecticut wages on the employee’s Form W-2 or the employer’s annual Form CT-W3 reconciliation.

By contrast, mischaracterized payments may create Connecticut withholding exposure. Connecticut’s Employer’s Tax Guide, Circular CT, IP 2026(1) explains that Connecticut generally follows federal rules in determining income subject to withholding and outlines the annual W-2 and CT-W3 reporting requirements. Facts vary, including the employee’s residency and work location. Review payroll treatment with a tax professional if payments were coded inconsistently.

Put the Plan Into Operation Before December 31!

Adopting a written policy is only the first step. Set up a process that creates a clear record of the expense, approval, and payment.

1. Adopt or restate the written plan. Have the corporation formally adopt a written accountable plan or update its existing policy. Keep the approved plan with corporate records.
2. Use an expense report. Require the owner-employee to submit dates, amounts, business purpose, and supporting receipts or other required records. For mileage and travel, include the information required to substantiate the trip.
3. Run reimbursements monthly. A monthly cycle gives the employee a regular opportunity to submit records and helps the corporation identify missing receipts, unsupported expenses, or excess advances.
4. Maintain a subsidiary ledger. Track each owner-employee expense by type, date incurred, amount claimed, amount substantiated, and reimbursement date. Reconcile the ledger to receipts, corporate bank statements, and bookkeeping entries.
5. Review corporate records. Compare the ledger with corporate minutes and bank records. Confirm that reimbursements are business-related and are not duplicate payments or distributions.
6. Complete the year-end review. Submit remaining expense reports, resolve excess advances, and complete eligible reimbursements before December 31, 2026. Confirm the appropriate tax-year treatment with your tax professional.
7. Address prior-year errors before filing. If earlier payments lacked substantiation or were treated as nonaccountable, discuss corrections with a tax professional before filing payroll returns and Forms W-2. Do not reclassify payments without reviewing the records and applicable rules.

A consistent monthly process makes this year-end review more manageable. For practical support with bookkeeping and year-end tax planning, contact Jose’s Tax Service. We provide year-end planning, bookkeeping, and tax preparation with virtual and in-person appointments. Schedule your appointment before the December 31, 2026 year-end cutoff.

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