Accountable Plans for S Corp Owners

By Tom, CPA · Updated October 27, 2026

Part of: Tax Planning

TL;DR: S corp owner-employees cannot deduct unreimbursed work expenses federally. An accountable plan lets the company reimburse business expenses tax-free if they are business-connected, substantiated, and excess is returned.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Here is a puzzle that trips up nearly every new S corporation owner. As a sole proprietor, you deducted your home office, your mileage and your phone directly on Schedule C. Then you elected S corp status, became an employee of your own company, and discovered that employees cannot deduct unreimbursed work expenses on their federal return. Ever. The 2025 law made that permanent. Your home office deduction did not get better; it vanished.

The fix is an accountable plan: a written reimbursement arrangement that lets your S corporation pay you back for business expenses tax-free and deduct them itself. The tax code is 4 million words long; you need about 400 of them to set one up properly, most of them in Treasury Regulation 1.62-2. This guide covers why S corp owners need one, the three requirements, home office and mileage reimbursements, and the elements of a written plan. Rules are federal, as of Oct 2026.

CPA Warning Label: Reimbursements without substantiation become taxable wages. Adopt the plan in advance, follow it, and keep expense reports with receipts.

Why S corp owners need one

When you work for your S corporation, you are its W-2 employee. Unreimbursed employee business expenses were miscellaneous itemized deductions subject to the 2%-of-AGI floor, suspended from 2018 and permanently disallowed by the 2025 law, under the 2025 law, as reflected in IRS guidance.

Without a plan, your options are bad:

• Pay expenses personally and deduct nothing.
• Have the company reimburse you without a plan, which is a "nonaccountable" arrangement: the reimbursement is taxable wages, subject to payroll tax and withholding.
• Have the company pay personal-looking expenses directly with no documentation, which invites trouble.

With an accountable plan, reimbursements are excluded from your wages, not reported on your W-2, and deductible by the S corporation, which lowers the K-1 income. It is the S corp equivalent of the deductions you had as a sole proprietor, with paperwork.

Partnerships and multi-member LLCs have their own mechanics (partners can sometimes deduct unreimbursed partnership expenses if the partnership agreement requires them to pay), but this guide focuses on S corporations.

The three requirements

Under Treas. Reg. 1.62-2, an arrangement is accountable only if it meets all three:

1. Business connection. Expenses must be deductible business expenses paid or incurred while performing services as an employee.
2. Substantiation. You must substantiate the expenses to the company within a reasonable period: amount, time, place and business purpose, with receipts where required.
3. Return of excess. Any advance or allowance above substantiated expenses must be returned within a reasonable period.

The regulations provide safe harbors for "reasonable period": advances paid no more than 30 days before the expense, substantiation within 60 days after the expense is paid or incurred, and return of excess within 120 days. Alternatively, a periodic statement method works if the employer sends statements at least quarterly and requires substantiation or return within 120 days of the statement.

If the plan fails the requirements, payments are treated as paid under a nonaccountable plan: taxable wages. If you reimburse yourself and never substantiate, you fail.

Home office reimbursement

An S corp owner who works from a home office can have the corporation reimburse the business share of home expenses. Typical approach:

• Measure the office and home square footage to compute a business-use percentage.
• Gather actual costs: rent or mortgage interest, property tax, insurance, utilities, repairs.
• Submit a monthly or quarterly expense report showing the calculation, with bills attached.
• The corporation reimburses that amount and books it as an office expense.

The office generally must meet the same standards as the home office deduction: regular and exclusive use and, for an employee, for the convenience of the employer. Our home office deduction guide covers the tests.

Depreciation is a gray area. Many practitioners exclude depreciation from employee home office reimbursements, because reimbursing depreciation on property you personally own can raise recapture and gain questions. Others include it. Follow your preparer's approach consistently and document it. The simplified $5-per-square-foot method is a Schedule C convenience and does not directly apply to employee reimbursements, though a reimbursement calculated on actual costs is the cleaner approach.

Mileage reimbursement

The corporation can reimburse business driving in your personal car at the IRS standard mileage rate. For 2026, that is 72.5 cents per mile for January 1 to June 30 and 76 cents per mile from July 1 to December 31, per the IRS. Reimbursements at or below the federal rate, with a proper mileage log, are deemed substantiated in amount; you still need the time, place and business purpose of each trip.

Alternatively, the corporation can own the vehicle, with personal use treated as a taxable fringe benefit. That is a different structure with its own rules.

Commuting is still personal. If your home office is your principal place of business, trips from home to clients are generally business. Our vehicle deduction guide covers logs.

Other common reimbursements

• Cell phone: the business-use share, or the company can provide a phone.
• Internet: the business-use share.
• Travel: airfare, lodging, and meals (50% deductible to the company) for business travel away from home.
• Supplies and equipment bought personally for the business.
• Professional dues and continuing education related to the business.

Health insurance premiums for more-than-2% shareholders are handled differently: reimbursements are included in W-2 wages so the shareholder can claim the self-employed health insurance deduction. See our self-employed health insurance guide.

Template elements of a written plan

The regulations do not strictly require a written plan, but a written board resolution and policy are strongly advisable evidence. Common elements:

1. A statement that the corporation adopts an accountable plan under IRC Section 62(c) and Treas. Reg. 1.62-2.
2. Who is covered (employees, including shareholder-employees).
3. Types of reimbursable expenses, required to be ordinary and necessary business expenses.
4. Substantiation requirements and deadlines, such as within 60 days.
5. Return-of-excess requirement, such as within 120 days.
6. Expense report format: date, amount, business purpose, receipts.
7. Mileage reimbursement at no more than the IRS standard rate.
8. Effective date, adopted by board resolution and kept with corporate records.

Adopt it before the reimbursements happen. A plan "adopted" in April for the prior year's expenses is a weak document. Then actually follow it: regular expense reports, attached receipts, reimbursements recorded properly in the books.

Mistakes that sink accountable plans

• Round-number monthly "allowances" with no expense reports. A flat $500 a month for "home office" without substantiation is a nonaccountable plan, so it is taxable wages.
• Reimbursing personal costs. The plan only covers ordinary and necessary business expenses. Groceries, family phones and vacations do not become business expenses because the company paid them.
• Booking reimbursements as distributions. They should be recorded as business expenses, with the report attached. Mislabeling muddles both the deduction and your stock basis.
• Annual catch-up reimbursements. One giant December reimbursement for the whole year can fail the reasonable-period rules for early-year expenses. Monthly or quarterly reports are safer.
• Forgetting to adopt the plan. No resolution, no written policy, no consistent practice: the arrangement is hard to defend.
• Double deductions. If the company reimburses the office, you do not also claim it anywhere on your personal return.

Practical setup: a one-page policy, a board resolution, a simple spreadsheet template for expense reports, and a calendar reminder to submit by the 15th of each month. It is not glamorous, but it turns personal spending on business needs into legitimate company deductions.

Illustration

Avery owns an S corporation and works from a 150-square-foot home office in a 1,500-square-foot rented apartment (10%). Rent is $30,000 a year; utilities and renters insurance are $3,600. Avery also drove 3,000 business miles in 2026, 1,500 in each half.

• Home office reimbursement: 10% × $33,600 = $3,360.
• Mileage: 1,500 × $0.725 + 1,500 × $0.76 = $2,227.50.
• Phone and internet at 50% business use: $900.
• Total accountable plan reimbursements: about $6,488.

Without a plan, Avery would deduct none of this personally. With a plan, the corporation deducts about $6,488, reducing K-1 income, and Avery receives the cash tax-free. At a combined 24% federal bracket, that is about $1,557 of income tax saved, and the money comes out of the company without counting as wages or distributions. Illustrative only.