LLC, S-Corp, or C-Corp How to Know Which Entity Structure Your Business Has Outgrown

When was the last time you looked at your business entity structure?

When you first started the company?

If you are like most business owners, you set up your original company structure and never revisit it again.

That decision, usually defaulting to an LLC, may be fine when profit is low. It becomes expensive when profits reach $300,000 and catastrophic at $700,000. The extra tax you are paying on $700,000 of profit with the wrong structure can easily exceed $80,000 – $100,000 a year. That’s not an accounting rounding error, that’s real wealth being destroyed by inaction.

If you are not evaluating your business structure every year as part of ongoing tax planning, you’re paying taxes your structure didn’t require you to pay.

Entity design is not always about going with the next biggest entity structure. With tax law and profit changes affecting your business, you can find the entity structure that you left is actually the perfect one to now be in. Sometimes going backwards and undoing your entity structure is the best move.

With the recent shift in QBI, qualified business income deduction, we have found many S-Corp owners are now paying more in tax than when they were just a single-member LLC.

The Default Structure and What It’s Actually Costing You

Is a single-member LLC the right structure for a growing business?
A single-member LLC is an effective starting structure, but it becomes increasingly expensive as profit grows because all net income is subject to self-employment tax. Business owners generating more than $80,000–$100,000 in annual net profit should evaluate whether their current structure is still tax-efficient or whether an S-Corp election or multi-entity approach would reduce their overall tax burden.

Most business owners will default with an LLC, limited liability company, entity structure. They are easy, and more importantly, inexpensive, to form.

LLCs are formed through your state. Every state has a different process and fee to form your LLC for you. If you want to learn more about your state rules, consult your state’s Secretary of State website on LLC formation.

Having an LLC gives you real legitimacy to your business, you have an official name, an EIN (employer identification number), you can open bank accounts under your business name, and it will go on your tax return.

In addition, you also get the benefit of having limited liability which is always a great benefit to have, especially if you are in an industry with a lot of litigation or liability.

Having limited liability tells the person suing you that the buck stops at your company. They are not able to pierce the corporate veil and go after your personal assets.

Even though all of these benefits are nice to have, there are no tax benefits of having an LLC.

All of your business income and expenses are recorded on your personal tax return, under your Schedule C. The net income from your business is 100% subject to self-employment taxes, 15.3% up to the Social Security wage base, and 2.9% above that.

Let me tell you from experience, when a business owner opens up their tax return and sees a giant tax bill, it is always a surprise and it is always generated from self-employment tax that they were not expecting.

At $150,000 in net profit, you get to pay $22,950 in self-employment tax. It hurts if you were not expecting it, but not the end of the world. At $400,000 in profit that bill becomes $33,500. That means, the larger business with an S-Corporation election is paying less in self-employment tax than the smaller business with no election at all.

Choosing the correct entity structure is not simply about paying less in tax. As a small business owner, cash is king. Every extra dollar out of your pocket is one less dollar in your business’ emergency fund, one less employee you can hire, one less dollar in your take home pay.

It’s worth your time and effort to not settle for the default and consider what entity structure is best for you.

The S-Corporation Election – The First Structural Inflection Point

At what profit level should I elect S-Corp status?
There is no universal profit threshold for an S-Corp election. The right number depends on your state, your industry compensation benchmarks, your payroll administration costs, and your existing entity structure. That said, the strategy generally begins to produce meaningful savings when net profit consistently exceeds $80,000–$100,000 annually, because below that level the payroll compliance costs can offset much of the tax benefit.

The S-Corporation election is always the first election people consider when thinking about their entity.

Let’s be clear. The S-election is not an entity election, it is a tax election, it sits on top of your LLC and tells the IRS you want to be taxed as an S-Corporation.

The purpose of making an S-Corporation election for tax planning purposes, is to split your profit, net income, into salary and distributions. The salary portion is still taxed at the 15.3% self-employment tax, but the distributions are not.

In our comparison of the $150,000 vs $400,000 of profit, a company making $400,000 with the owner receiving $100,000 salary will pay less in self-employment tax than the company making $150,000 as a sole proprietor. It is $15,300 vs $22,950, a tax savings of $7,650 a year!

What would an extra $7,000 in cash flow mean to you? To your business?

Unfortunately it is not so easy as to pick a random number for your salary so you can harvest all the tax savings. The IRS expects, demands even, that you set a reasonable compensation for yourself. Remember, the IRS doesn’t give you the benefit of the doubt. The burden is on you to prove your compensation is defensible.

The IRS does not give us a formula to establish our reasonable compensation. It would be very simple to say your reasonable compensation should be 50%, 60%, or 80% of your net profit, but that’s not how it works.

The IRS expects a salary that reflects market rate for your role. If you are like most business owners, you have many roles, all of them in fact. This is the many hats approach that allows you to break up your salary into time spent in the various different roles. There are several other methods that you can use to create a defensible reasonable compensation plan. It doesn’t matter which method you use, the key is to use one of the methods as reasonable compensation is the single fastest way to invite audit risk into this strategy.

As we explored in “How to Save Taxes with an S-Corporation What Most Business Owners Don’t Know”, a lower salary doesn’t guarantee tax savings. There is a fine balance between the tax savings we achieve in self-employment taxes and the tax savings we lose with the qualified business income deduction, QBI or 199a deduction.

Even if we ignore the impact of QBI on our tax savings, we have other costs that we have to consider with an S-Corporation.

We have additional compliance costs such as bookkeeping, running payroll, and tax filings that need to be accounted for. If you are only seeing $2-5k in tax savings from making the switch to an S-Corporation, there is a good chance you could be losing that tax savings to administrative costs.

The $7,650 we saved in taxes a year gets eaten pretty quickly when you hire a bookkeeper for $3,000 a year, pay $2,000 to have your S-Corporation tax return prepared and filed, and pay $1,000 for a payroll provider to run your payroll. Suddenly your $7,650 savings has turned into $1,650 savings and come with a lot more headache. Once we add the loss of tax savings from of QBI to the calculation, you could be paying more money in tax.

You also have state considerations that will play into your decision of filing for an S-Corporation. States like New York and California have separate taxes assessed on LLCs and S-Corporations. For example, California has a 1.5% franchise tax, minimum $800, that is assessed every year.

If you decide that the S-Corporation election is right for you, the IRS has specific rules and timing you must follow. To make the election you must file Form 2553 and it must be done within 75 days of the effective date. That means if you want the election to be effective on January 1st, you have until March 15th to file the form and make the election. If you miss the deadline, you can ask for late relief from the IRS, but you will need to show you’ve met all the requirements for being an S-Corporation but just forgot to make the election. Too many people try to wait until the end of the year, run the numbers and see that they would have had tax savings as an S-Corporation, and then file a late election. That will not cut it. The IRS does not and will not grant late relief in those circumstances. You should use the numbers at the end of the year to tax plan for the next year.

As we’ve shown, tax savings from an S-Corporation can swing widely from year to year. This is why you don’t want to use rules of thumb, and more importantly, this is why you want to assess your entity structure and tax election every year to see if your current structure still makes sense.

Where the S-Corporation Hits Its Own Ceiling

What are the limitations of an S-Corp as a business grows?
S-Corps eliminate self-employment tax on distributions, but all profit still flows to the owner's personal tax return as ordinary income. At higher income levels, particularly when net profit exceeds $500,000 annually, owners face top marginal federal rates of 35–37% with no mechanism inside the S-Corp to reduce the rate itself. At this stage, a layered entity structure that includes a C-Corp for specific income streams may provide meaningful additional savings.

The tax savings you can achieve from splitting your net profit between salary and distributions is a great strategy, and a good first step when thinking about entity selection.

The downside to an S-Corporation is that it is still a pass-through entity. The net profit will pass through the S-Corporation return and on to your personal return through the K-1, your share of the business income reported to you each year. That means it is still taxed at your ordinary income tax rate, the highest rate applied to any type of income.

When we think about income shifting, our goal would be to shift income out of a higher tax bracket and into a lower tax bracket. S-Corporations do not achieve that goal, there is no shifting of income.

If you are stuck in a high marginal tax bracket 35-37%, you are paying the max tax you can on your business income. We need another strategy to shift that income off of your personal tax return and into a lower bracket. This is where the C-Corporation comes into play.

The C-Corporation Layer: A Different Tool, Not a Replacement

Should I have both an S-Corp and a C-Corp?
Some business owners benefit from operating both an S-Corp and a C-Corp as complementary entities rather than choosing between them. The S-Corp handles core service income with pass-through taxation and eliminates self-employment tax on distributions, while the C-Corp can receive specific income streams, such as licensing fees or management services, and retain those earnings at the 21% corporate rate. This structure is most relevant for owners generating $500,000 or more in annual profit and planning for long-term business growth or an eventual exit.

The first thing every business owner thinks when they hear about the idea of a C-Corporation is, “no, there is double taxation”.

They are not wrong, money coming out of C-Corporations can be subject to double taxation, but stopping there would be a real disservice to the tax planning opportunities that C-Corporations bring with them.

The beauty of a C-Corporation is its flat tax rate of 21%. That is already better than paying tax at the 37% tax bracket. Now we just need a strategy for managing the double taxation.

Let’s touch on how the double taxation happens. When there is net profit in a C-Corporation it is taxed on that profit at the flat 21% rate. This is a corporate tax, paid by the corporation on its tax return, Form 1120. When you take that money out of the corporation, to your personal bank account, that distribution counts as a dividend. Most dividends issued by your C-Corporation are going to be Qualified Dividends and be taxed at long-term capital gains rates. This is the issue of double taxation. You could be paying a flat 21% tax on the income and then a 15% or 20% tax rate on the dividend for an effective combined rate of 36-41% on distributed earnings. The secret to C-Corporations is not distribution, it’s retention. If we build a tax plan around that, we can unlock significant tax savings.

But if C-Corporations have double taxation, how can we use them for tax savings?

The strategy is to not replace your S-Corporation with a C-Corporation but to marry your S-Corporation with a C-Corporation. Businesses don’t have to be all or nothing when it comes to business entities, they can split themselves across several business entities to really maximize the tax savings.

Before you start forming multiple entities for tax savings, let’s be clear, businesses need a legitimate purpose to exist. Unfortunately, tax avoidance is not a legitimate purpose, at least not in the eyes of the IRS.

If you took a hard look at your business, can you see logical and legitimate reasons to split your revenue or services between multiple businesses?

Do you run a veterinarian office? Then you probably have separate revenue streams between the actual work with meeting clients and selling products and medicine at the front. Maybe you do surgical work on animals versus just normal checkups. The reason you would start a C-Corporation is to separate the liability and reduce your exposure.

Most business owners can find legitimate reasons to split their business into multiple entities if they put in the effort to really look.

C-Corporations also come with other benefits worth noting. C-Corporations can qualify for Section 1202, Qualified Small Business Stock or QSBS. If structured properly from the start of the corporation, a C-Corporation can qualify for up to $15 million of capital gains exclusion when the business owner exits the company. If you are planning an eventual sale or exit from the company, being able to sell the company and get a portion tax-free can go a long way to keeping more money in your pocket for retirement. It pays to think about C-Corporations not only as a next year tax planning strategy but a tax strategy we can implement today to reap the benefits in the future.

What don’t you want to use a C-Corporation for, real estate. Real estate doesn’t belong in any corporation, S-Corporation or C-Corporation. Real estate has a lot of great tax benefits on its own, and you will lose those benefits when you put them in a corporation. Depreciation, 1031 exchanges, step up in basis, and capital gains treatment on sale are all lost benefits when you start putting real estate into a corporation. The right structure for real estate is its own conversation, and we will cover it next.

The Multi-Entity Architecture: What It Actually Looks Like at Scale

What does a multi-entity tax structure look like for a service business?
A multi-entity structure for a high-income service business owner typically involves three layers: an S-Corp that handles core operating income, a C-Corp that receives specific income streams eligible for corporate rate treatment, and a separate LLC or LP that holds real estate outside the corporate structure. Each entity has a distinct tax function, and the arrangement is designed to optimize the rate applied to each type of income rather than treating all income identically.

How do all of these entities play well with each other? It’s a balance between structuring your entities properly and balancing the income and purpose strategically.

Your S-Corporation is going to be your main business, your core operating entity. This will bring in your bulk of revenue, handle payroll, retirement contributions, and normal operating expenses. For a business owner generating $600,000 in net profit, the S-Corporation might carry $400,000 of that revenue, with a $120,000 reasonable compensation and $280,000 in distributions.

Your C-Corporation is going to absorb a separate revenue stream, handle management expenses, licensing, and other higher level duties such as royalty payments, intellectual property, or management services. Shifting too much revenue to the C-Corporation can have the negative effect of pushing your personal marginal tax rate below 21% which would cause you to pay too much tax with the C-Corporation’s flat 21% rate. The optimal place for the C-Corporation is to keep your marginal tax rate above 21%, so the rate differential is always working in your favor. Below that threshold, you’ve over-shifted and created tax inefficiency.

Your LLC or even Limited Partnership (LP) is going to hold any real estate. If it’s under a limited partnership agreement, it will be between you (personally) and your C-Corporation, with the C-Corporation owning a small (1-2% ownership as the General Partner). This will allow your C-Corporation to lend money to the LP to purchase the real estate. The LP will borrow the money, pay the C-Corporation back, where the interest is considered income, but the principal repayment is not a dividend or income because it’s just a repayment of debt. With this strategy we are getting money distributed from the C-Corporation without the double taxation. If you didn’t have this structure, and you just took money out of the C-Corporation to buy real estate, that creates a taxable dividend.

As you can see, entities shouldn’t be formed or used randomly. Each entity has a specific tax purpose to exist that should be thought through before forming the entities. These combined entities have the effect that different income streams are taxed at the rate most appropriate to them rather than everything piling into one unfavorable tax rate.

Running three entities, or more, will come with considerable compliance cost and workload. Multiple tax returns, sets of books across entities, documented meeting minutes and intercompany transactions will all come into play once you have more than one entity. You have to make sure you have the correct structures and tax planning in place before you embark on this journey and cost yourself time and money.

The Three Most Expensive Structural Mistakes

What are the most common entity structure mistakes business owners make?
The most costly entity structure mistakes include: staying in a default single-member LLC past the point where an S-Corp election would generate meaningful payroll tax savings; treating entity structure as a one-time formation decision rather than revisiting it as profit and complexity grow; and not layering different entities for different purposes.

Mistake 1: Staying with your default entity structure without giving consideration to other entity structures as your profit grows. We get it, a sole proprietor or LLC is quick and easy to form and manage. In most cases, this is the perfect entity structure when you are starting your business. There is no sense in forming a three-entity structure when you don’t even know if your business is going to be around next year. At the start of every business, it is always a rocky process, the goal is to just stay in business. Go for the low cost, low hassle option when the opportunity cost is minimal.

But. There comes a point when ignoring your success and growth actually makes it harder to stay in business. Every year you delay an S-Corporation election at $300,000 in profit, you could be wasting $15,000 – $30,000 a year to taxes. That cash is vital to any small business owner and the cost of inaction compounds against you.

Mistake 2: Treating entity structure as a one-time formation decision rather than revisiting it as your profit grows. Entity selection is not a one and done process. Just because an S-Corporation made sense 3 years ago doesn’t mean it makes sense today. In fact, it may actually be costing you money. It is an important management decision to revisit your entity structure on a regular basis. At the very least, you should target significant profit changes or tax law changes. Personally, we like to put this in an annual tax planning review to make sure we are always maximizing our tax benefits.

Mistake 3: Most people go from LLC to S-Corporation and they stop there. They see the S-Corp as the end of the line entity structure and never look to other options. As we have shown, there is a lot of power to be able to shift income off your personal tax return by using different entity structures. There is no reason you can’t have multiple structures all serving a unique purpose. Once your personal tax rate is 35%+, it is time to explore other structures to reduce your overall tax liability.

A Profit-Stage Decision Map

The chart below is not a rule of thumb, it’s a trigger. These are the profit levels where the math typically starts to move, not universal thresholds. Everyone’s situation will be unique and there are a lot of factors that play into the math to see if there will be tax savings. There is only one way to know if a different structure will benefit you: run the numbers.

Summary

Most business owners are paying more tax than they should because they never stopped to reconsider their business structure. Managing your entity structure or structures is a strategic decision that every business owner needs to make over the life of the business. Multiple structures serving unique purposes is smart planning, and sometimes the smart move is to unwind your structure when it is no longer serving its purpose.