S-Corps can be incredibly tax-efficient structures, but they come with strict rules. Break these rules, and you could face double taxation, back taxes, penalties, and interest.
If you operate as an S-Corp, review this checklist before December 31st.
Overview of Critical S-Corp Compliance Issues
Below is a summary of the three most critical S-Corp mistakes and their potential consequences:
Issue | The Problem | IRS Response | Key Action |
|---|---|---|---|
No Reasonable Salary | Taking only distributions without W-2 wages | Reclassifies distributions as wages; back payroll taxes + penalties | Pay yourself market-rate W-2 salary |
Debt-Financed Distributions | Using company loans to fund owner distributions | Tax on excess distributions over basis | Switch to partnership structure if debt-dependent |
Undocumented Shareholder Loans | Informal lending without promissory notes | Treats loans as distributions or wages; unexpected taxes | Document all loans with terms, interest, repayment schedule |
The Three Critical Mistakes
1. Not Taking a Real, Reasonable Salary
This is the most common mistake I see with S-Corp owners.
If you own the S-Corp and actively work in the business, you must pay yourself a reasonable W-2 salary and file all required payroll taxes.
Many owners try to take everything as profit distributions to avoid payroll taxes. The IRS knows this strategy, and they actively look for it.
You need to pay yourself what someone else would earn doing your job in the market. If you run a plumbing company generating $400,000 annually, you cannot pay yourself $30,000 in wages and take the remaining $370,000 as distributions.
Why I take this one seriously: The IRS can assess penalties not just against you, but also against us (your tax preparer) under IRC Section 6694. The penalty is the greater of $1,000 or 50% of the preparer's fee for that return. I've seen preparers hit with $5,000+ penalties.
This means we have significant skin in the game when it comes to your reasonable compensation. If you're pushing back on taking a proper salary, understand that you're putting us at risk as well.
2. Distributions Financed by Company Debt
Be careful about how you fund owner distributions. If your business relies on taking out loans to pay distributions to owners, an S-Corp is the wrong structure for you.
Debt works fundamentally differently in S-Corps versus partnerships:
In a partnership: Company debt increases your tax basis, which lets you absorb losses and take distributions without immediately triggering taxes.
In an S-Corp: Debt does not increase your basis. If you take a distribution larger than the money you personally invested out of pocket, you owe taxes on the excess - even if that money came from a business loan.
What to do: If your business model depends on using debt to finance owner payments, you should restructure as a partnership with S-Corps potentially layered into the organizational chart.
If you lend money to your S-Corp, or the company lends money to you, it must be properly documented.
Required documentation includes:
A promissory note with clear loan terms
A specified interest rate
A defined repayment schedule
Actual tracking and recording of all repayments
What happens without documentation: The IRS has multiple options, and none of them benefit you. They may treat the loan as a distribution (potentially causing distributions in excess of basis), or they may reclassify it as wages. Either way, you lose the tax benefits and could owe unexpected taxes plus penalties.
What Happens If You Make These Mistakes
The consequences can be severe:
Salary Reclassification: If you didn't take a reasonable salary, the IRS can reclassify your distributions as wages. You'll owe back payroll taxes on Social Security and Medicare, plus penalties and interest.
Tax on Excess Distributions: If you took distributions beyond what you personally invested (especially if debt-financed), you'll owe income tax on that excess, plus penalties and interest.
Loan Reclassification: Undocumented loans can be treated as either distributions or wages, both triggering unexpected tax bills.
These problems compound over time. Back taxes, interest, and penalties can quickly create serious financial issues.
Year-End Action Items
Before December 31, 2025, review the following:
Verify you've taken a reasonable W-2 salary for 2025
If you've taken debt-financed distributions, evaluate whether S-Corp remains the right structure
Ensure any shareholder loans have proper documentation (promissory notes, interest rates, repayment schedules)
If any of these scenarios sound familiar, reach out for a tax planning appointment before year-end. I'd rather help you fix these issues now than deal with an IRS audit notice in 2026.
Sunbridge Advisory
Your dedicated finance and tax team
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