S-Corp vs. LLC: What Massachusetts Business Owners Get Wrong at Tax Time

The S-Corp versus LLC question comes up constantly for Massachusetts business owners. Most people pick one when they start their business and never revisit it. That is often where the problem begins.

The choice of entity structure has real tax consequences, and those consequences change as your business grows. This article explains the key differences, the most common mistakes, and when it makes sense to take a fresh look.

The Basic Difference

An LLC, or limited liability company, is a legal structure that protects your personal assets from business liabilities. On its own, an LLC does not have a federal tax classification. By default, a single member LLC is taxed as a sole proprietorship. A multi-member LLC is taxed as a partnership. The income flows through to your personal return and you pay taxes on it there.

An S-Corp is a tax election, not a separate legal structure. An LLC can elect to be taxed as an S-Corp by filing the appropriate paperwork with the IRS. Once that election is in place, the business is still an LLC under state law, but it is treated as an S-Corp for federal tax purposes.

That distinction matters because the tax treatment is different in ways that can add up to significant dollars.

Where the S-Corp Advantage Comes From

When you own an LLC taxed as a sole proprietorship or partnership, all of your net business income is subject to self-employment tax. That tax covers Social Security and Medicare and runs around 15.3 percent on the first portion of your income. On a profitable business, that is a substantial number.

With an S-Corp election, you split your income into two parts. You pay yourself a reasonable salary, which is subject to payroll taxes. The remaining profit passes through to you as a distribution, which is not subject to self-employment tax. The savings on that distribution can be meaningful.

This is the core reason many profitable small businesses elect S-Corp status. But it is not a simple decision, and the savings only materialize when the structure is set up and maintained correctly.

What Massachusetts Business Owners Get Wrong

Waiting Too Long to Make the Election

The S-Corp election has deadlines. To be effective for a given tax year, the election generally needs to be filed within the first two months and fifteen days of that year, or before the end of the prior year. Business owners who decide in October that they want S-Corp treatment for the current year are typically too late.

Missing the window means waiting another full year and paying self-employment tax on income that could have been structured differently.

Setting the Salary Too Low

The IRS requires S-Corp owners to pay themselves a reasonable salary for the work they perform. Some business owners set their salary artificially low to maximize the distribution and minimize payroll taxes. This is a well-known audit trigger.

Reasonable salary is determined by what you would pay someone else to do your job. Getting this wrong creates exposure that can wipe out the tax savings the election was supposed to produce.

Not Accounting for Massachusetts Rules

Massachusetts has its own treatment of S-Corps that differs from federal rules in a few ways. The state imposes an excise tax on S-Corps and treats certain income differently than the federal government does. Business owners who focus only on the federal benefit sometimes get surprised by the Massachusetts side of the calculation.

Working with a CPA who understands both levels of the tax code is important for getting an accurate picture of what the election actually saves you in Massachusetts specifically.

Never Revisiting the Structure

Entity structure is not a set it and forget it decision. The right structure at $400,000 in revenue may not be the right structure at $1.5 million. As your business grows, the tradeoffs shift. The administrative costs of maintaining an S-Corp, payroll, separate accounts, additional filings, become a smaller percentage of the savings. What did not make sense early on often makes a lot of sense later.

Business owners who made their entity choice at startup and have never revisited it are often leaving money on the table or carrying the wrong structure for where they are now.

Mixing Up the Legal and Tax Layers

An S-Corp election changes how you are taxed. It does not change your legal structure. Some business owners assume electing S-Corp status changes what they need to do at the state level, or that it affects their liability protection. It does not. The legal structure and the tax classification operate on separate tracks, and confusing them leads to missed filings or incorrect assumptions about protection.

When to Have the Conversation With Your CPA

If any of the following apply to you, it is worth a conversation about whether your current structure still makes sense:

• Your business is consistently profitable and growing
• You have never revisited your entity structure since you started
• You are paying significant self-employment tax each year
• You are planning a sale, bringing on a partner, or adding investors
• Your CPA has never raised the subject

The tax services ADC CPA provides include entity structure review as part of an ongoing planning engagement. The goal is to make sure your structure matches where your business is now and where it is going, not just where it was when you filed your first return.

Want to Know If Your Current Structure Still Makes Sense?

If you are a Massachusetts business owner who has never revisited your LLC or S-Corp election, it may be worth a closer look. Contact ADC CPA to schedule a consultation and find out whether your current structure is working for you or costing you.