When does switching from an LLC to an S Corp actually save you money? A revenue-based guide for consultants

You started your consulting firm as an LLC because it was fast, simple, and your accountant said it was fine for now. And it was fine. At $200,000 or $400,000 in revenue, the tax structure worked well enough that optimizing it was not worth the hassle.

But now the firm is clearing $600,000, $800,000, or more, and you just wrote a check to the IRS that made you wonder whether "fine for now" has quietly become expensive. A colleague mentioned she switched to an S corporation last year and saved over $25,000 in taxes. Your CPA says it depends. The internet gives you twelve conflicting answers.

Here is the straightforward version. The LLC vs S corp decision for consultants comes down to one question: Is the tax savings from an S corp election large enough to justify the additional costs and complexity it creates? And the answer depends almost entirely on how much profit your firm generates after you pay yourself a reasonable salary.

How an LLC and an S Corp are taxed differently

An LLC taxed as a sole proprietorship or partnership passes all profits through to the owner's personal tax return. The full amount is subject to both income tax and self-employment tax. Self-employment tax covers Social Security and Medicare at a combined rate of 15.3% on earnings up to $168,600 in 2025, plus an additional 2.9% Medicare tax on earnings above that threshold.

For a consulting firm netting $400,000 in profit, the self-employment tax alone can exceed $30,000. That is on top of your regular income tax rate.

An S corp changes the math. When you elect S corp status (which you can do as an LLC without changing your legal entity), you split your income into two categories: salary and distributions. You pay yourself a reasonable salary, which is subject to payroll tax. The remaining profit passes through as a distribution and is subject to income tax but not to self-employment or payroll tax.

That split is where the savings come from. Every dollar classified as a distribution rather than salary avoids the 15.3% self-employment tax.

The revenue range where the switch starts making financial sense

The S corporation election is not free. It introduces additional costs that do not exist with a standard LLC. These include payroll processing fees, additional payroll tax filings, potentially higher accounting and tax preparation fees, and the administrative burden of running payroll for yourself on a regular schedule. For most firms, these added costs range from $3,000 to $8,000 per year.

That means the tax savings need to exceed those costs by a meaningful margin to make the switch worthwhile. Here is how the math generally plays out for consulting firms.

1. Below $150,000 in net profit. The savings from salary-distribution splitting are modest, often less than $5,000. After accounting for additional S corp costs, you may break even or even come out behind. Staying as an LLC is usually the simpler and smarter choice.

2. $150,000 to $300,000 in net profit. This is the gray zone where the decision gets interesting. Savings typically range from $8,000 to $18,000, depending on the salary structure. After S corp costs, most firms see a net benefit of $5,000 to $12,000. Worth considering, especially if your revenue trajectory is climbing.

3. Above $300,000 in net profit. The case for S-corp status becomes stronger. Tax savings can reach $20,000 to $40,000 or more annually, far exceeding the additional administrative costs. Most consulting firms at this level are leaving significant money on the table if they have not made the election.

These ranges assume a single owner. Multi-partner firms have additional variables, but the same general principle applies: the wider the gap between reasonable salary and total profit, the more an S corp saves.

The reasonable salary question is where most firms get it wrong

The IRS requires S corporation owners to pay themselves a "reasonable salary" before taking distributions. There is no fixed formula, but the salary should reflect what someone in a comparable role would earn in the open market.

For a consulting firm owner who manages client relationships, delivers services, and runs the business, reasonable salary benchmarks typically range from $80,000 to $175,000, depending on the firm's size, industry, and the owner's responsibilities. Setting your salary at $40,000 while distributing $350,000 is a red flag that invites IRS scrutiny.

The common mistakes go in both directions. Setting the salary too low triggers audit risk. Setting it too high eliminates the tax benefit you switched for in the first place. The right number balances compliance with optimization, and it should be reviewed annually as your firm grows and your role evolves.

Work with a CPA who understands professional service firms to benchmark your salary. Document the rationale. This is not an area where guessing works well.

Three factors beyond taxes that should influence your decision

1. Cash flow timing matters. With an S corp, you commit to regular payroll runs. That means predictable cash outflows on a fixed schedule regardless of whether client payments have arrived. For firms with lumpy, project-based revenue, this requires enough cash reserves to cover payroll during gaps between client payments. If your cash flow is tight or unpredictable, the rigidity of S Corp payroll can create unnecessary stress.

2. State tax rules vary significantly. Not every state treats S corporations the same way. California, for example, imposes a 1.5% franchise tax on S corporation net income with a minimum of $800 annually. New York City does not recognize S corporation status at all for local tax purposes. Your state's rules can reduce or even eliminate the federal savings. Always model the full tax picture, federal and state combined, before making the election.

3. Growth plans change the equation. If you plan to bring on equity partners, raise outside investment, or eventually sell the firm, your entity structure needs to support those goals. S corporations have restrictions on the number and type of shareholders. A C corp or a different structure might serve your long-term plans better, even if an S corp saves taxes today.

Decide with real numbers, not rules of thumb

The LLC vs S Corp question for consultants does not have a universal answer. It depends on your specific profit level, salary benchmarks, state tax environment, cash flow patterns, and growth plans. Rules of thumb like "switch at $100K in profit" oversimplify a decision that deserves a real financial analysis.

Run the actual numbers. Compare your current self-employment tax burden against the projected savings from salary-distribution splitting, minus the additional costs of S corp compliance. Model it based on your current revenue and where you expect to be in two years.

The right entity structure is not about chasing the lowest possible tax bill in a single year. It is about building a financial foundation that supports how your firm operates today and where it is heading next.