Reimburse. Don't Deduct.

When you formed an S-Corp, you became an employee of your own company. This changed everything about how you deduct expenses.

Before 2018, employees could deduct "unreimbursed business expenses" on Schedule A. That deduction is dead.The Tax Cuts and Jobs Act suspended miscellaneous itemized deductions — including unreimbursed employee expenses — for tax years 2018 through 2025, and current law keeps employee business expenses off the table for W-2 earners.

Here's what makes this trap so expensive: the expenses are real. You really do use your home office, your personal car, and your cell phone for the business. Most owners either eat those costs with after-tax dollars or — worse — run them through the business sloppily and create taxable income or audit exposure. The accountable plan fixes both problems at once.

Instead of trying to deduct expenses personally, your S-Corp reimburses you. The math is beautiful:

• For the business: it gets a 100% tax deduction for the reimbursement expense.
• For you (the employee): you receive the check 100% tax-free. It is not income.

Potential annual savings: $2,000 – $5,000 for a typical owner. Found money.

The mechanics come from the tax code's accountable plan rules (Section 62(c) and its regulations), which set three requirements for a reimbursement to stay tax-free: the expense must have a business connection, you must substantiate it (date, amount, business purpose) within a reasonable time, and you must return any excess advance you can't substantiate. Meet all three and the payment never touches your W-2. Miss any one and the IRS treats the whole arrangement as a "nonaccountable plan" — meaning every dollar becomes taxable wages subject to payroll tax.

One update worth knowing: the IRS adjusts the standard mileage rate every year — it moved to 70 cents per mile for 2025 — so the reimbursement on the same 5,000 business miles grows over time. Your plan should always reference "the current IRS standard mileage rate" rather than a hard-coded number, so it never goes stale.

Beyond the Big Three, an accountable plan can also cover business travel paid on a personal card, professional dues and licenses, continuing education, software subscriptions you carry personally, and supplies you grabbed at the store with your own money. The pattern is always the same: real business expense, paid personally, substantiated, reimbursed.

Take an anonymized composite we see constantly: an S-Corp consultant with a 200-square-foot office in a 2,000-square-foot home, 5,000 business miles a year, and heavy phone and internet use.

• Home office: 10% of $30,000 in home costs = $3,000
• Mileage: 5,000 miles at the standard rate = $3,350
• Cell and internet at reasonable business percentages = $2,400

That's $8,750 of reimbursements. Because each dollar is also a deduction on the S-Corp's books, it reduces the K-1 income that flows to your personal return. At a 32% federal marginal rate, that's roughly $2,800 of federal income tax saved — before counting any state income tax. And unlike salary, the $8,750 itself lands in your personal account with zero tax withheld, because it was never income in the first place.

Run that for ten years and you've moved roughly $87,500 out of the corporation tax-free while deducting all of it. The plan takes about an hour to set up and maybe twenty minutes a quarter to maintain. There are very few strategies with a better effort-to-savings ratio.

If you're still deciding whether the S-Corp itself makes sense, start with our S-Corp Savings Calculator — the accountable plan stacks on top of the self-employment tax savings an election already produces.

The IRS requires a formal paper trail. If you skip this, it's just taxable income. Two documents do almost all of the work:

• The Plan Document. Your corporation must adopt a written Accountable Plan. This is a one-time legal resolution that says "We agree to reimburse employees for substantiated expenses." We provide this template.
• The Expense Report. You must submit an expense report (quarterly is fine) attaching receipts. It must show the date, the amount, and the business purpose (e.g., "Client lunch with John Doe").

Timing matters too. Reimbursements should happen within a reasonable period — in practice, within about 60 days of the expense. A pile of receipts handed to your accountant the following April does not qualify. This is why we put clients on a quarterly cadence: it's frequent enough to satisfy the IRS and infrequent enough that it never feels like a burden.

• Paying a flat monthly "allowance." A $500/month vehicle stipend with no mileage log is not a reimbursement — it's disguised wages, taxable and subject to payroll tax. Substantiation is what separates the two.
• No written plan. Reimbursements without an adopted plan document are the first thing an examiner reclassifies. The document costs you one signature; skipping it can cost the entire deduction.
• Reimbursing a non-exclusive home office. If the "office" is also the guest bedroom or the kids' homework station, the business-use percentage is zero. Exclusive means exclusive.
• Counting commuting miles. Driving from home to your regular office is personal, period. Trips between work sites, to client meetings, and to the bank for business count — the daily commute does not.
• Doing it once and forgetting it. An accountable plan is a habit, not an event. The owners who capture the full $8,000+ per year are the ones with a 15-minute quarterly routine.