You Crossed $400K. Has Your Business Entity Kept Up?

You built a business over time. It has grown — maybe slowly at first, then faster than expected. And somewhere along the way you stopped thinking about the entity structure you started with, because it was working fine. But the tax line on your Schedule C is getting hard to ignore, and you are starting to wonder whether the box you picked at the beginning is still the right one.

The question is simple: has your business entity kept up with your business? If you are still filing as a sole proprietor or a single-member LLC and your profit has grown substantially, the answer is probably no — and there is a well-established structure that addresses exactly that gap.

The S corp question is worth examining when the self-employment tax bill has crossed into five figures.

The quiet cost of staying with what you started

When you launch a business, the simplest entity is the right one. A sole proprietorship or a single-member LLC requires no separate tax return, no payroll, no annual corporate filings. You report the income on Schedule C and pay income tax plus self-employment tax on every dollar of net profit.

The self-employment tax applies to every dollar of that profit with no upper limit on the Medicare portion. At a certain profit level, that figure becomes large enough that the structure itself is costing you real money. California's $800 minimum franchise tax applies to LLCs and S corps alike, so there is no state-level penalty for changing entities.

When an S corp changes the math

An S corporation divides the business profit into two categories: a reasonable salary and distributions. The salary is subject to payroll taxes. The distributions are not. At the right profit level, the tax saved on those distributions outweighs the cost of running payroll, filing Form 1120-S, and the California S corp tax.

If the business nets a strong profit and the owner takes a reasonable salary, the remaining profit flows through as a distribution. The self-employment or payroll tax lands only on the salary portion. Against the full Schedule C treatment — where every dollar is exposed — the annual savings can be substantial.

The threshold varies by industry and individual situation. For most service businesses, the numbers tip decisively once the business is generating well into six figures after expenses. Below that range, the added compliance costs may eat the benefit; above it, the math is hard to ignore.

We walked through the full calculations in "The S Corp Question for 2026", mapping the crossover across different profit levels.

What reasonable compensation looks like

The most common IRS audit issue with S corps is compensation. You must pay yourself a salary that is reasonable for the work you do. If you are the primary revenue driver of a profitable business, you cannot set your W-2 wage at a token amount and take the rest as distributions.

For a business owner who is the main producer — a consultant, a dentist, an agency owner — compensation typically runs within a range tied to what someone in that role would earn from an employer. Industry surveys, comparable job postings, and guidance from a professional who handles entity structuring all help determine the right number.

We covered the IRS factors in our reasonable compensation guide.

Beyond one entity: business owners who own property

The single-entity decision gets more interesting when the business also owns real estate. The same owner running a profitable practice out of a building they own — or renting space to their own business — can benefit from a two-entity structure.

In that setup, the operating business pays rent to a separate property-owning entity. The rent is deductible to the operating company and income to the property entity. The net effect is greater flexibility, better asset protection, and often a lower combined tax bill.

We cover this in detail in "Your Business Owns Your Building. Why That Might Cost You." and the broader multi-entity structure.

How the conversion works

Switching from a sole proprietorship or LLC to an S corp requires filing Form 2553 with the IRS. For an existing business, the election must take effect at the start of the tax year, and there is a filing deadline to meet. Late elections are often granted relief under IRS procedures, but filing on time is cleaner.

The added costs are modest. A payroll service handles the quarterly filings. An enrolled agent or CPA files the Form 1120-S. The compliance burden is small relative to the self-employment tax savings at the income levels where the structure makes sense.

The Form 2553 walkthrough goes through every field and what each deadline means.

The objections — and what to look at instead

The common hesitations are reasonable — but they usually reflect the business you had, not the one you have now.

"I am not sure I am big enough." Look at the self-employment tax line on your Schedule C. If the number is meaningful relative to your total profit, run the S corp math.

"The extra filing is a headache." A payroll service and a quarterly relationship with someone who handles entity returns make the ongoing work routine — and the cost is far below the savings at the right income level.

"My CPA would have told me if it mattered." Most preparers file what is given to them. The question "should I elect S corp status?" requires a forward-looking analysis that most return preparation engagements do not include. We talk more about the gap between preparation and strategy in "What a Customized Tax Strategy Covers That Your Preparer Doesn't."

Putting it together

Your business entity is the legal container your income flows through. If it is still the one you picked when the business was a fraction of its current size, it is worth a look. The tax line has changed. The options that did not matter at an earlier stage may now make a meaningful difference.

A discovery call can surface whether the math works for your specific numbers — with no obligation and no pitch. Call (619) 280-2700 or reach out through the website.

FAQ

What is the 5 year rule for S corps?

The IRS requires that former C corporations wait five years before electing S status if they have certain built-in gains. This rule does not apply to businesses that were always sole proprietorships or LLCs electing S corp status for the first time.

When should you hire a tax strategist?

A tax strategist makes sense when your tax situation has grown beyond what your preparer handles during filing season. Common triggers are crossing the threshold where self-employment tax becomes significant, adding a business entity, or buying property.

What are some effective tax planning strategies for small businesses?

Entity choice is the foundation. An S corp election at the right income level, setting reasonable compensation, and multi-entity structures for businesses that own property are core moves. Retirement plans and income timing add further savings.

How do I know if my S corp salary is reasonable?

The IRS compares your salary to what someone with your duties would earn doing the same work for another company. Industry compensation surveys, comparable job postings, and a professional who handles entity structuring all help set the right number.

Can I switch from an LLC to an S corp mid-year?

For an existing business, the S corp election must take effect at the start of the tax year, with a filing deadline early in that year. A professional can confirm the exact date for your situation and handle any late-election relief if the deadline has passed.

Want to talk this through? Book a free 15-minute discovery call