S Corp vs LLC: The Deduction Most Owners Miss

If you don’t have a reimbursement policy set up for your business, you’re handing money to the IRS that you never owed. This comes up constantly in the S corp vs LLC conversation, and it’s one of the most overlooked tax strategies out there.

It’s called an Accountable Plan. Most business owners have never heard of it. And plenty of CPAs either haven’t either, or they know the term and never bother setting one up for their clients.

At BizBud, we help business owners stop overpaying on taxes, and this is one of the first things we look at when a new S Corp client comes to us, because the money left on the table is usually thousands of dollars a year.

By the end of this guide, you’ll know exactly what an Accountable Plan is, which entities need one, what expenses qualify, how the timing works, and how to execute it so it actually holds up.

What an Accountable Plan Actually Is

Strip away the jargon and an Accountable Plan is just a reimbursement policy for your business.

Think back to working for someone else. You needed paper for the printer, or you picked up lunch for a client meeting, or you paid for a hotel on a work trip. You kept the receipt, turned it in, and the company cut you a check for what you spent.

That’s the whole concept.

You weren’t taxed on that check. Nobody added it to your W-2. It wasn’t income, it was the company paying you back for money you fronted on their behalf. The company deducted the expense. You got made whole.

Now flip the roles. You own the business. You’re also the employee spending personal money on business stuff. Same mechanics, same tax treatment, except now you’re on both sides of the transaction.

An Accountable Plan is the document that makes it official. It states that your company has a reimbursement policy, that any employee (including you) who spends personal money on a valid business expense can be reimbursed, and it lays out the rules for how and when.

This isn’t a loophole. It’s the same policy every real corporation in America runs. The only difference is nobody handed you an HR manual when you started your company.

Who Needs One: S Corp vs C Corp vs Partnership

Here’s where entity structure matters, and where the answer stops being one-size-fits-all.

The logic is simple. If your business is a separate entity from you for tax purposes, you need a formal mechanism to move money from the business to your pocket without creating taxable income. If your business is you for tax purposes, there’s nothing to formalize.

One important exception to that fourth row: if your single-member LLC has made an S corporation election, you’re taxed as an S Corp and you’re an employee of it. You need the plan. The entity’s legal form isn’t what decides this — its tax classification is.

The S Corp vs C Corp Distinction

Both benefit in an S corp vs C corp comparison, but the reasoning differs slightly. With a C Corp you’re dealing with a genuinely separate taxpayer, so every dollar you move out matters. With an S Corp the income flows to your personal return anyway, but the reimbursement still knocks down the business income before it hits your K-1. Either way you win. The Accountable Plan just changes the character of the money from taxable to non-taxable.

But single-member LLC owners without an S election, don’t chase this one. Your business income and your personal income are already the same pile. Setting up a reimbursement policy for yourself accomplishes nothing except paperwork.

“How Much Does It Cost to Start an LLC, and Should I Even Be an S Corp?”

New owners ask how much it costs to start an LLC constantly, and the answer is that formation cost is the least important number in the whole equation. Filing fees vary by state and they’re a one-time thing.

The number that actually moves your life is how much tax you pay every single year after that. Entity choice, reasonable salary, and yes, whether you’ve got a reimbursement policy in place. That’s where the real money is.

So if you’re at the formation stage, fine, get the LLC filed. But understand that the deductions you set up after formation are what determine whether this business makes you money or just makes you busy.

What You Can Get Reimbursed For

These are the categories where personal money regularly leaks into business use:

• Mileage. You drive your personal vehicle for business. The business reimburses you per mile.
• Home office. If you’re running the business out of your house, that space has a cost and the business should be paying you for it.
• Telephone. Your cell phone, used for business calls, texts, emails, client communication.
• Travel. Any business travel you accidentally paid for out of your personal account.
• Office supplies. The mundane stuff. Paper, ink, equipment, the small purchases that add up fast.

A quick note on travel. If it’s business travel, you should be putting it on the business card in the first place. The reimbursement policy exists to catch the times you slipped up and used personal funds, not as your default payment method. Clean books beat clever fixes every time.

And don’t limit your thinking to this list. The test is whether you spent personal money on a legitimate business expense. If yes, it belongs in the plan.

The Math: Why This Matters More Than You Think

Let’s run actual numbers.

Say your company made $100,000 this year. Over those twelve months you racked up $10,000 in mileage, home office, phone, and supplies that you paid for personally.

Scenario A: No Accountable Plan. Your business income is $100,000. You paid $10,000 out of pocket and never got it back, or you pulled the money out some other way and it’s not properly documented as a reimbursement. You just missed a $10,000 deduction.

Scenario B: Accountable Plan in place, properly executed. The business reimburses you $10,000. Business income drops to $90,000. You’ve got $10,000 in your personal account. And you pay zero personal tax on that $10,000, because it isn’t income. It’s a reimbursement.

Same business. Same expenses. Same year. One version costs you thousands more in tax than the other, and the only difference is a document and a habit.

That’s the whole pitch. Money out of the business, into your pocket, deductible to the company, tax-free to you.

How to Set It Up (Step by Step)

Three phases. Don’t skip any of them, and pay particular attention to the third, because that’s where most people fall apart.

Step 1: Draft the policy document

You need an actual written document. It states that your company maintains an Accountable Plan reimbursement policy, defines who’s eligible, spells out what qualifies as a business expense, and sets your substantiation deadline.

That deadline isn’t entirely your call. The rules require expenses to be substantiated within a reasonable period, and there’s a safe harbor most plans are built around: substantiate within 60 days of incurring the expense, and return any excess advance within 120 days. Build your policy inside those windows, write it down, and then live by it, because a policy you ignore is worse than no policy at all.

Step 2: Pick your reimbursement rhythm

Monthly or quarterly. Those are the two schedules we typically set up for clients.

Monthly is better. You build the habit, the details are fresh, and you’re never reconstructing four months of mileage from memory.

But some people just won’t do it monthly. They don’t want to sit down and prepare a reimbursement request twelve times a year. Fine. Do it quarterly and stick to it. A quarterly plan you actually follow beats a monthly plan you abandon in March.

Step 3: Create the receipt and file it

Every reimbursement needs backing documentation. You create a receipt or reimbursement request showing what the expenses were, when they happened, what business purpose they served, and how much you’re being reimbursed.

We give our clients a template for exactly this and walk them through filling it out, because the format matters less than the consistency.

Then save it. Folder, cloud drive, wherever you’ll actually find it later. If someone ever asks you to show the receipt and explain why you claimed it, you need to produce that document without breaking a sweat.

The Execution Trap

Setting up the plan is easy. Executing it properly is where owners lose the benefit, and we’ve seen it play out plenty of times.

They get the document drafted. They feel good about it. Then they never create a single receipt, never file anything, never document a business purpose. Twelve months later they’re pulling money out and calling it a reimbursement with nothing behind it.

That’s not a reimbursement. That’s a distribution with a nice name on it, and it won’t survive scrutiny.

The plan and the execution are one thing, not two. Documentation isn’t administrative overhead you can defer, it’s the substance of the deduction. No receipt, no business purpose, no deduction.

So build the routine. Calendar reminder on the same day every month or every quarter. Fifteen minutes. Fill out the template, pull the receipts together, note the business purpose, cut the reimbursement, file the paperwork.

Boring? Sure. Boring and worth thousands of dollars.

Your Implementation Checklist

Run through this and be honest about where you stand:

1. Confirm your entity qualifies. S Corp, C Corp, multi-member LLC, or partnership. If you’re a sole proprietor or a single-member LLC without an S election, skip it.
2. Draft the written Accountable Plan document. Not a mental note. A document.
3. Set your substantiation window inside the 60-day safe harbor and write it into the policy.
4. Choose your reimbursement schedule. Monthly if you can hold the habit, quarterly if you can’t.
5. Identify your expense categories. Mileage, home office, telephone, travel, office supplies, plus anything else where personal money covers business needs.
6. Get a receipt template you’ll actually use. Same format every time.
7. Create the documentation every cycle. Business purpose, date, amount. Every time.
8. Pay the reimbursement from business to personal. Actually move the money.
9. File everything in one place. Findable in under a minute.
10. Review annually. Categories change as the business changes.

Don’t Wing This One

The reason we don’t recommend doing this on your own is that the setup and the execution both have to be right. A policy with a sloppy substantiation window, missing documentation, or reimbursements that never actually got paid gives you the paperwork burden without the tax benefit.

You want the deduction and the clean file that backs it up.

If you’re an S Corp owner, a C Corp owner, or in a partnership and you don’t have an Accountable Plan reimbursement policy in place right now, you’re paying more tax than the law requires. Not because you did anything wrong, but because nobody told you this existed.

Now somebody has.

Get the policy drafted, pick your schedule, start creating those receipts, and stop leaving thousands of dollars on the table every year. If you want help setting it up correctly, that’s exactly what we do at BizBud.

About The Author:

Cameron Botes is the founder of BizBud, a tax and accounting firm built for content creators, influencers, digital nomads, and entrepreneurs building businesses across borders. A former professional soccer player across four continents, Cameron brings the same discipline, preparation, and pressure-tested execution from his athletic career into helping business owners plan ahead, stay compliant, and keep more control over their financial future.

Since founding BizBud in 2020, Cameron has grown the firm from a one-person practice into a team of CPAs and tax advisors serving hundreds of clients across the U.S. and around the world. With an MBA in finance and accounting, international business experience, and a team with backgrounds at firms like PwC, Deloitte, and EY, Cameron helps creators and founders simplify taxes, clean up their books, and build smarter systems so they can focus on the work they actually love.

• Instagram
• LinkedIn