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The Single-Member LLC Playbook

A single-member LLC is the most common first entity in small business, and one of the few plays you can genuinely run yourself. Formation is straightforward in most states. Straightforward isn't the same as airtight, though, so have an attorney check your setup for gaps.

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Can I do this myself?

Forming the LLC, getting the EIN, and opening the bank account are all things you can handle directly. Pay for the things that matter: an operating agreement, a return prepared correctly, and someone to tell you when your profit has outgrown this structure.

Who this is for

A single-member LLC has exactly one owner. That single fact decides whether this playbook applies to you or whether you need a different one.

A good fit

  • Freelancers, consultants, and contractors
  • Service businesses with one owner
  • Side businesses with real revenue and real contracts
  • Rental or investment property held by one owner
  • A sole proprietor who wants separation and a cleaner paper trail
Married couples in community property states can sometimes own an LLC jointly and still be treated as a single-member LLC. It depends on your state and how the LLC is documented.

A different playbook

  • Two or more owners (a partnership return, Form 1065)
  • Adding a spouse as an owner outside a community property state
  • Licensed professions your state requires to form a PLLC
  • Businesses raising money from outside investors
  • Profit already high enough to justify an S-corp election
None of these are dead ends. They just start somewhere else, and the order you do things in changes the tax result.

What the LLC actually does

Most of the confusion here comes from one assumption: that forming an LLC changes your taxes. It doesn't. Here's what it does and doesn't do.

The protection
An LLC is a state-law liability shield. Business debts and claims generally stop at the entity instead of reaching your house and personal accounts.
The tax treatment
By default a single-member LLC is a disregarded entity. No separate federal income tax return. Income and expenses land on Schedule C of your personal return, exactly as they did before.
What you still owe
Income tax plus self-employment tax of 15.3% on net profit, up to the Social Security wage base, with Medicare continuing above it. Forming the LLC does not reduce this.
What the shield doesn't cover
Anything you personally guarantee, your own professional negligence, and unpaid payroll taxes. And it fails entirely if you don't keep the finances separate.
Ongoing cost
State filing fees, a registered agent, and an annual report or franchise tax in most states. Usually modest, but not zero, and a few states charge meaningfully more.
When to revisit
When profit is high enough that self-employment tax on distributions becomes the biggest line on your return, an S-corp election enters the conversation. Not before.

Red flag checks

These are the things that quietly undo the protection you paid for, or turn a simple return into a complicated one.

Commingled money

Running personal expenses through the business account is the single most common reason a court disregards an LLC. Separation is the protection. Without it you have paperwork, not a shield.

Forming out of state

Delaware and Wyoming get recommended constantly to people who don't operate there. You still have to register in the state you actually work in, so you end up with two sets of fees and two filings.

Adding a second owner casually

Handing a partner or a family member a percentage converts the LLC to a partnership. That means a Form 1065, K-1s, and a March deadline you probably didn't know you had.

The first year with no withholding

Leaving a W-2 job for self-employment means nothing is withheld anymore. The bill arrives in April with penalties attached, and it's larger than most people plan for.

Working across state lines

Customers, employees, inventory, or property in another state can create filing and sales tax obligations there. Nexus rules don't wait for you to notice them.

Electing S-corp too early

The election adds payroll, a separate return, and real annual cost. Below a certain profit level it costs more than it saves. The LLC is the right structure until the numbers say otherwise.

Running the play

In order. Steps one through three take an afternoon. The rest are habits, and the habits are what determine whether this works.

01 Form the LLC with your stateThe state creates the entity, not the IRS
  • File articles of organization with the state where you actually do business. Filing directly with the state is cheapest.
  • A registered agent service is worth the money. It keeps your home address off the public record and makes sure legal notices actually reach you.
  • Save the stamped filing and your state entity number. Every later step asks for them.
Pitfalls
  • Forming where you don't operate. You'll register in your home state anyway, and pay twice.
  • Naming yourself as agent at your home address. It's public, permanent, and hard to undo later.
  • Signing contracts before the LLC exists. Anything signed personally stays personal.
02 Put the operating agreement in writingNobody makes you. Do it anyway.
  • With one owner it feels like paperwork for nobody. It isn't. It's the document that shows the LLC is separate from you, and banks, lenders, and courts all look for it.
  • Address succession explicitly. Without it, a single-member LLC can sit stuck in probate while the business needs someone to sign things.
  • A template gets you a draft. An attorney's review is cheap next to a gap you discover during a lawsuit or a sale.
Pitfalls
  • Using a multi-member template unedited. Voting and partner buyout clauses that describe people who don't exist undercut the whole document.
  • Signing it once and never looking again. A new property, a spouse in the business, or a second line of work all belong in it.
03 Get the EINFree, direct from the IRS, about ten minutes
  • Apply after the state approves the LLC, so the legal name on the EIN matches the filing exactly.
  • Apply directly at IRS.gov. It is free, and the EIN keeps your Social Security number off client W-9s.
  • Download and file the CP 575 confirmation letter. Banks and payroll providers ask for it and it is annoying to replace.
Pitfalls
  • Reusing a sole proprietor EIN. A new legal entity generally needs its own EIN.
  • Name mismatches. If the EIN name doesn't match the state filing, expect notices and rejected e-filings.
04 Open business bankingThe separation that makes the LLC real
  • Bring the state organizing documents, the EIN letter, and the operating agreement. Most banks want all three.
  • Open a checking account and a business card at minimum. Add a second account for tax savings while you're there.
  • Move every client payment and every business expense through it from day one.
Pitfalls
  • Using a personal account "just for now." Now becomes a year, and untangling it costs more than the account ever would have.
  • Swiping the business card for groceries. Every one of those is an argument that the LLC and you are the same thing.
05 License, register, and insureDo it before the first sale, not after
  • Check city and county licensing, not just state. Local requirements are the ones people miss.
  • If you sell products or taxable services, register for sales tax before the first sale, not after.
  • Carry general liability insurance, and professional liability if you advise or design. The LLC does not cover your own negligence.
Pitfalls
  • Treating the LLC as insurance. They cover different risks and you need both.
  • Uncollected sales tax. You still owe it, out of your own pocket, plus penalties.
06 Set up a bookkeeping systemSpreadsheets have a ceiling
  • Excel can carry a very simple business with a handful of transactions a month. It stops being enough quickly.
  • Once the LLC is formed, a third-party system is the better default. Good options: QuickBooks, Xero, Wave, Zoho Books.
  • Connect the bank feed and categorize monthly, not in April. Reconstruction is where the real cost is.
Pitfalls
  • Recording owner draws as an expense. Draws are equity, not a deduction, and this inflates your loss and understates your tax.
  • A year of uncategorized transactions. Cleanup billed by the hour costs multiples of doing it monthly.
  • Deducting the whole equipment purchase without thinking about depreciation. There are choices here, and they affect more than one year.
07 Build the tax savings budgetMonthly discipline on income after expenses
  • There is no salary and no withholding here. All of your income after expenses is uncovered.
  • Budget for income tax and self-employment tax together. People plan for one and get surprised by the other.
  • Set the money aside monthly in a separate account, not quarterly out of whatever's left.
Pro tip: run your income after expenses through the Business Tax Budgeter each month to stay prepared for taxes.
Pitfalls
  • Treating the balance in the account as spendable. A portion of it is already owed. It just hasn't been asked for yet.
  • Budgeting off last year in a growth year. Rising income means rising rates and a bigger shortfall than the prior year suggests.
08 Pay quarterly estimated taxesSafe harbor first, precision second
  • Prior-year safe harbor is the floor that stops penalties, not a measure of what you'll owe.
  • States run on their own schedules and their own safe harbor rules.
  • Planning lever: if you or a spouse also has W-2 income, withholding counts as paid evenly across the year. A Q4 withholding bump fixes an underpayment that a Q4 estimate can't.
Use the Estimated Tax Safe Harbor Calculator for prior-year calculations and to lessen penalties.

Pro tip: preferably work with a tax advisor to determine real-time estimated taxes each quarter.
Pitfalls
  • Hitting safe harbor and stopping. You avoided the penalty and still owe a large balance in April. Two different problems.
  • Skipping the first year entirely. The first year of self-employment is exactly when the penalty shows up.
  • Paying federal and forgetting the state. Two systems, two sets of penalties.
09 File the annual returnSchedule C, and where a professional earns their fee
  • The business is reported on Schedule C with your personal return, plus Schedule SE for self-employment tax.
  • We recommend a tax professional at this stage. Filing mistakes can cost an audit, penalties and interest, and more than the preparation fee ever would have.
  • If you paid contractors, 1099s are due in January, before your own return is anywhere near ready.
Pitfalls
  • Aggressive deductions with no records. Schedule C draws attention, and the burden of proof is yours.
  • Missing depreciation entirely. It doesn't just disappear. It follows you to the year you sell the asset.
  • Assuming an extension delays payment. It extends the filing, not the bill.
10 Keep the entity in good standingAnnual, boring, and easy to forget
  • Calendar the annual report and any franchise tax. Missing them can lead to administrative dissolution, and dissolution takes the liability shield with it.
  • Keep the registered agent current and your address updated with the state.
  • Sign contracts in the LLC's name, in your capacity as member. Signing personally quietly gives away the protection.
Pitfalls
  • Notices going to an old address. Lapses usually start as mail nobody received.
  • Reinstatement after dissolution. More expensive than the filing fee you skipped, and there's a gap in your history that lenders can see.
11 Review the structure every yearThe LLC is a starting point, not an endpoint
  • Once profit is consistently strong, model the S-corp election against what it costs to run. Most owners look at this too early or ten years too late.
  • A SEP-IRA or solo 401(k) is usually the largest deduction available to a profitable one-owner business. Deadlines vary by plan type, so decide early.
  • Watch for anything that changes the entity: a new owner, a second line of business, property purchased, or work in a new state.
Next play: if your profit is outgrowing this structure, the S-Corp Election Playbook covers what changes and what it costs.
Pitfalls
  • Electing S-corp on a rule of thumb from the internet. The number depends on your profit, your state, and your retirement plan.
  • Putting appreciated real estate into the wrong entity. Easy to move in, expensive to move out. Ask before you title anything.

You can run this one yourself.

Formation, EIN, and banking are genuinely do-it-yourself. Where it pays to bring someone in is the operating agreement, annual return, estimated taxes, and the moment your profit outgrows this structure.

Browse more playbooks Read the S-Corp playbook

This playbook is general educational information, not tax, legal, or accounting advice, and it does not create a professional relationship. LLC rules turn heavily on your specific facts, your entity documents, and your state. Consult a qualified tax professional before making or relying on any of the decisions described here.

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