A single-member LLC taxed as a sole proprietorship pays self-employment tax, 15.3%, on all of its net profit. An S-Corp election changes that math by letting the owner split income into a "reasonable salary," which is subject to payroll tax, and a separate distribution, which is not subject to self-employment tax at all. For profitable businesses, this split is where the real savings come from.
The savings only materialize once net profit clears a meaningful threshold, typically somewhere in the $45,000 to $60,000 range depending on the reasonable salary figure the IRS would expect for your role. Below that, the cost of running payroll, filing a separate Form 1120-S, and maintaining corporate formalities usually outweighs the tax benefit.
Comparing the Same Business Two Different Ways
Consider a freelance IT consultant generating $110,000 in net profit for the year. As a sole proprietor or default-taxed single-member LLC, the full $110,000 is subject to the 15.3% self-employment tax, coming to roughly $16,830, on top of regular income tax on the same amount.
Electing S-Corp status, this same consultant determines a reasonable salary of $65,000 for their role, based on what a comparable IT consulting employee would earn in their market, and takes the remaining $45,000 as a distribution. Payroll taxes (the employee and employer portions combined, which functionally mirror self-employment tax) apply only to the $65,000 salary, coming to roughly $9,945, while the $45,000 distribution is not subject to self-employment or payroll tax at all. The difference, in this example, comes to nearly $6,900 in annual tax savings, against the added cost of running payroll and filing a separate business return, commonly a few thousand dollars a year depending on the provider. For a consultant at this profit level, the S-Corp election clearly pays for itself; for the same consultant at $40,000 in profit, it likely would not.
The "reasonable salary" requirement is where most DIY S-Corp elections go wrong. The IRS expects the salary portion to reflect what you would actually pay someone else to do your job, setting it artificially low to maximize the tax-free distribution is one of the more common audit triggers for small S-Corps.
An election also adds real compliance weight: payroll runs, quarterly payroll tax deposits, a separate business tax return, and bookkeeping that correctly separates salary from distributions. None of that is a reason to avoid the election if the numbers support it, it is a reason to have someone managing the bookkeeping who is accounting for it correctly from month one.
If you are unsure whether your net profit is high enough to justify the switch, a free consultation with Hasco Tax Advisors will give you a clear answer with actual numbers behind it, not a general rule of thumb, since the right threshold depends on your specific income, expenses, and state.
The Specific Timing Rule for Making the Election
To have S-Corp treatment apply for an entire tax year, Form 2553 generally needs to be filed within two months and fifteen days of the start of that tax year, or at any point during the prior tax year. Miss this window and the election, even if otherwise valid, typically doesn't take effect until the following tax year, unless you qualify for late-election relief, which requires a reasonable-cause explanation and is not automatically granted.
This timing rule is exactly why S-Corp planning works best as a year-ahead conversation rather than a decision made in the middle of a profitable year, since a mistimed election can mean waiting an entire extra year for the tax savings to actually begin.
It's also worth reviewing this decision annually rather than assuming an election made in one year remains optimal indefinitely. A business whose profit fluctuates meaningfully year to year may find that the S-Corp election's compliance costs outweigh the benefit in a slower year, even though the same structure made clear sense the year before.