As a single-member LLC owner, you should set aside roughly 25% to 40% of your net business profit for taxes. Where you land inside that range depends on how much you earn, your filing status, and whether your state charges its own income tax. The reason the floor is so high is that two federal taxes stack on the same dollar of profit: self-employment tax at 15.3%, plus regular federal income tax on top.
A Quick Set-Aside Guide by Profit Level
These ranges assume a single filer with no other income and cover federal tax plus a typical state income tax load:
- Under $50,000 in net profit: about 20% to 28%
- $50,000 to $100,000: about 28% to 35%
- $100,000 to $200,000: about 30% to 38%
- Over $200,000: about 35% to 42%, once the Additional Medicare Tax and higher brackets kick in
If it’s your first year and you have no prior return to work from, start at 30% of every dollar of net profit and move it into a separate account as the money comes in. Adjust after your first quarter, once you have real numbers.
Why the Range Runs So High
The IRS treats a single-member LLC as a disregarded entity by default. Your business doesn’t file its own return; the net profit flows to your personal Form 1040 through Schedule C and is taxed as personal income.1Internal Revenue Service. Single Member Limited Liability Companies That profit then attracts two separate federal taxes.
Self-Employment Tax Is the Piece People Miss
A W-2 employee pays 7.65% of their wages toward Social Security and Medicare; the employer covers a matching 7.65%.2Social Security Administration. Social Security and Medicare Tax Rates Run your own LLC and you’re both sides of that equation, so you owe the full 15.3%: 12.4% for Social Security and 2.9% for Medicare.3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
The 15.3% applies to 92.35% of your net earnings rather than the whole amount.4Internal Revenue Service. Topic No. 554, Self-Employment Tax On $100,000 of net profit, that produces self-employment tax of about $14,130. The Social Security portion only runs up to the wage base, which is $184,500 for 2026.5Social Security Administration. Contribution and Benefit Base Above that limit, only the 2.9% Medicare piece continues.
High earners face one more layer. Self-employment income above $200,000 (single) or $250,000 (married filing jointly) picks up the Additional Medicare Tax of 0.9%, bringing the Medicare rate on those dollars to 3.8%.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax If you also have W-2 wages, the threshold applies to the combined total.
Federal Income Tax Sits On Top
Federal income tax uses progressive brackets. For 2026, a single filer pays 10% on income up to $12,400, 12% up to $50,400, 22% up to $105,700, 24% up to $201,775, and higher rates from there.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Married-filing-jointly brackets are roughly double. You’re not taxed at your top rate on every dollar; each bracket applies only to the income inside it.
Put the two taxes together and you can see how a mid-income LLC owner lands in the high 20s or low 30s. A single filer with $120,000 in net profit and no other income owes roughly $16,955 in self-employment tax and roughly $15,200 in federal income tax after taking the standard deduction and the deductible half of SE tax. That’s about $32,155 combined, or roughly 27% of profit. Add state income tax and the number climbs.
Deductions That Shrink What You Owe
Several deductions are unique to self-employed filers, and using them is what keeps most LLC owners from needing the top of the set-aside range.
Half of Your Self-Employment Tax
You can deduct the employer-equivalent half of your SE tax as an adjustment to income on Schedule 1.3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) It doesn’t reduce the SE tax itself, but it lowers your adjusted gross income and therefore your federal income tax.
The Qualified Business Income Deduction
The Section 199A deduction lets eligible LLC owners deduct up to 20% of their qualified business income before federal income tax is calculated. For 2026, it’s generally available in full if taxable income is below $203,000 (single) or $406,000 (married filing jointly). Above those thresholds, service businesses like law, medicine, consulting, and accounting see the deduction phase out; non-service businesses become subject to wage and capital limitations. This deduction alone can knock several percentage points off your effective rate.
Self-Employed Health Insurance
If you pay your own premiums and aren’t eligible for coverage through a spouse’s employer, you can deduct 100% of them on Schedule 1, line 17.8Internal Revenue Service. Instructions for Form 7206 The plan has to be established under your business, and the deduction covers you, your spouse, and your dependents.
Retirement Contributions
Self-employed retirement plans produce some of the largest deductions available, dollar for dollar. The main options for 2026:
- SEP-IRA: up to the lesser of 25% of net self-employment earnings or $72,000. No annual filing until balances reach $250,000.9Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
- Solo 401(k): up to $24,500 in employee deferrals plus employer profit-sharing, capped at a combined $72,000. A $8,000 catch-up is available at age 50, rising to $11,250 at ages 60 to 63.
- SIMPLE IRA: employee deferrals up to $17,000, with a $4,000 catch-up at 50 or $5,250 at ages 60 to 63.10Internal Revenue Service. 11Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals
The 2026 quarterly due dates are April 15, June 15, September 15, and January 15, 2027.12Internal Revenue Service. Form 1040-ES – Estimated Tax for Individuals The first two are only two months apart, not three. You can skip the January 15 payment if you file your full 2026 return and pay any balance by February 1, 2027.
A workable routine: pull your target percentage off every payment you receive and park it in a separate savings account. At each deadline, send one-fourth of your projected annual tax through EFTPS or IRS Direct Pay. If your income is uneven, the annualized income installment method on Form 2210 lets you match payments to the quarters when you actually earned the income.
Safe Harbors That Prevent Penalties
Underpay and the IRS charges interest on the shortfall, calculated separately for each quarter. For the second quarter of 2026, the underpayment interest rate is 6%.13Internal Revenue Service. Internal Revenue Bulletin 2026-08 You avoid the penalty entirely by meeting either safe harbor:14Internal Revenue Service. Topic No. 306 – Penalty for Underpayment of Estimated Tax
- Pay at least 90% of what you’ll actually owe for 2026.
- Pay at least 100% of the total tax from your 2025 return, in four equal installments.
The prior-year figure rises to 110% if your prior-year adjusted gross income was above $150,000 ($75,000 if married filing separately).15Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The prior-year method is easier because the number is known in January. If your income is growing, you’ll still owe the difference at filing, so keep the cash on hand.
Adjust for State and Local Taxes
Everything above is federal. Eight states have no individual income tax; the rest run from flat rates under 5% to progressive systems topping 13% at the highest brackets, and those rates stack straight onto the federal load. Some cities and localities add income or gross receipts taxes worth another 1% to 4%.
State estimated payments generally follow the same quarterly rhythm as federal ones but use your state’s own forms. If your LLC does business in more than one state, you may owe estimates and a return in each of them, subject to that state’s apportionment rules. Multi-state operators are the ones most likely to push the total set-aside toward the top of the 25% to 40% range or past it.
When an S Corp Election Changes the Math
Once your LLC’s net profit consistently clears $60,000 to $80,000, it’s worth looking at an S corporation election, filed on Form 2553.16Internal Revenue Service. Instructions for Form 2553 The election doesn’t change your legal structure; it changes how the IRS taxes what you earn. You pay yourself a reasonable salary through payroll, and remaining profits come out as distributions that generally aren’t subject to the 15.3% SE tax. On $180,000 of distributions, that’s about $27,540 in avoided SE tax.
The trade-off: the salary has to be reasonable for what someone with your skills would earn in your industry. Setting it artificially low is one of the most closely examined moves on the IRS’s radar, and courts have reclassified distributions as wages when the salary didn’t hold up.17Internal Revenue Service. S Corporation Employees, Shareholders, and Corporate Officers You also add payroll processing, quarterly Form 941 filings, and an annual Form 1120-S for the S corp itself.18Internal Revenue Service. About Form 941, Employer’s Quarterly Federal Tax Return Most S corp owners spend $2,000 to $5,000 more per year on compliance than a Schedule C filer. At $50,000 of profit the math rarely works; at $100,000 and up it usually does.
The election doesn’t touch federal income tax on profits, state income tax, or the Additional Medicare Tax, and both salary and distributions still land on your personal return. Self-employment income from an LLC, whether taxed as a sole proprietor or as an S corp, isn’t subject to the 3.8% net investment income tax that applies to passive investment income.19Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
Whatever percentage you choose, keep the money in a separate account you don’t touch. Oversaving by a few points means a refund. Undersaving means a penalty and a scramble in April.