An S-corp accountable plan is the one-page document standing between you and hundreds or thousands of dollars in lost deductions every year. If you elected S-corp status to save on self-employment tax — smart move — there's a catch most owners never hear about: you quietly lost your home office deduction, and maybe more. The good news is that an accountable plan brings it back, tax-free, and setting one up is a one-afternoon project. Here's exactly how it works.
As a sole proprietor, you claimed the home office deduction on Schedule C. No problem. But the second you declared S-corp status, you became a W-2 employee of your own company — and that path closed. As of July 2025, the One Big Beautiful Bill Act made the change permanent. That home office deduction evaporated.
So the business-use portion of your mortgage interest, utilities, insurance, and repairs all sits there. Undeducted. Every single year. Unless you have an accountable plan in place.
An accountable plan is a written reimbursement policy your corporation adopts. Done correctly, the business reimburses you tax-free — no income tax, no FICA — and deducts the payment as a business expense. Your home office deduction comes back through the back door.
The same S-corp accountable plan covers your cell phone, home internet, and business mileage (76 cents per mile in 2026). If you have an S-corp — or an LLC that has elected S-corp status — and you're not sure whether you have an accountable plan, you probably don't.
The IRS lays out three requirements in IRS Publication 463. Hit all three and you are compliant. Miss one and the reimbursements become taxable income.
Rule 1 — Business connection. The expense must be tied to the business. Your home office, business mileage, cell phone, and internet all qualify. Your gym membership or personal vacation do not.
Rule 2 — Substantiation. You must document the expense. For a home office, that means calculating your square footage and keeping the calculation. For mileage, a log. For cell phone and internet, a reasonable business-use percentage with a simple note showing how you arrived at it.
Rule 3 — Return of excess. Any reimbursement beyond the substantiated expense must be returned. In practice, most accountable plans reimburse exact amounts, so there is nothing to return — but if you ever receive more, it has to come back.
That is the whole framework. Simple, no?
Step one — Board resolution. Your S-corp formally adopts the accountable plan as a written corporate policy. If you are the only shareholder, you are still the board, and you still need to document this as a corporate action. One page. Date it. Sign it. File it in your corporate records. The resolution should state that the corporation will reimburse employees — including shareholder-employees — for ordinary and necessary business expenses, subject to substantiation and the return of excess amounts.
Step two — Reimbursement request form. Each time you submit expenses, the form captures the expense, the date, the business purpose, and the amount. For a home office, you'll likely do this monthly or quarterly with a consistent calculation.
Step three — Home office calculation. Divide the square footage of your dedicated office space by the total square footage of your home. That percentage applies to mortgage interest or rent, utilities, insurance, and repairs. Use the actual expense method, not the simplified method — the simplified method caps your deduction and is rarely better.
Step four — The reimbursement. The corporation writes you a check or makes a transfer. You record it as a business expense on the books. It does not show on your W-2. No income tax. No FICA.
Without a written accountable plan in place, any reimbursements your S-corp pays you could be treated as wages by the IRS. That means payroll taxes on both sides, income tax on your return, and potentially penalties if you did not run the money through payroll. The written plan is the difference between tax-free reimbursement and taxable compensation. The IRS requires the policy to exist in writing.
The plan must be adopted before the expenses are incurred — or at minimum before the reimbursements are paid. You cannot backfill an accountable plan retroactively for expenses you already paid without one in place. If you have been reimbursing yourself informally without a written policy, the time to formalize it is now, before the next payment.
Your CPA or business attorney can draft the resolution and the policy template. It is not a heavy lift. Once your S-corp accountable plan is in place, you maintain it with simple documentation going forward.
If you want to review whether your current setup qualifies — or get a plan in place before year-end — let's talk.
An S-corp accountable plan is a written reimbursement policy your corporation adopts so it can pay you back for business expenses tax-free. When it meets the IRS requirements, the reimbursement is not treated as wages — no income tax and no FICA — and the corporation still deducts the payment as a business expense.
When you elect S-corp status, you become a W-2 employee of your own company. Employees can no longer deduct unreimbursed home office expenses on their personal return, so the deduction you took on Schedule C as a sole proprietor disappears. The One Big Beautiful Bill Act made that change permanent as of July 2025. An accountable plan restores the benefit by having the corporation reimburse you instead.
The expense must have a business connection, you must substantiate it with records, and any reimbursement in excess of the substantiated amount must be returned. Meet all three and the reimbursement is tax-free; miss one and it becomes taxable income.
No. The plan must be adopted before the expenses are incurred, or at minimum before the reimbursements are paid. You cannot backdate an accountable plan to cover money you already reimbursed yourself without a written policy in place.
Common reimbursements include the business-use portion of your home office (mortgage interest or rent, utilities, insurance, and repairs), cell phone, home internet, and business mileage. Personal expenses such as a gym membership or vacation do not qualify.
No. A properly documented reimbursement is not compensation, so it does not appear on your W-2 and is not subject to income tax or FICA. Without a written plan, the same payment could be reclassified as wages and taxed on both sides.
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