The documents you need to file taxes for an LLC depend on how the IRS classifies your business. A single-member LLC defaults to a disregarded entity and files on the owner’s personal return; a multi-member LLC defaults to a partnership; either can elect to be taxed as an S-corporation or a C-corporation. Each classification calls for a different federal return and a different supporting file, but every LLC needs the same core stack: proof of classification, an EIN, business bank records, income and expense documentation, asset records, 1099s in and out, owner compensation records, and whatever return matches the classification.
Confirm Your Tax Classification First
Before you gather anything else, confirm which classification your LLC operates under. The IRS does not treat “LLC” as its own tax category. It assigns a default based on ownership: single-member LLCs are disregarded entities (taxed like sole proprietorships), and multi-member LLCs are taxed as partnerships.1Internal Revenue Service. Entities 3 – Classification of Domestic Limited Liability Companies
If your LLC elected something else, you should already have the paperwork. C-corporation election means Form 8832 was filed.2Internal Revenue Service. About Form 8832, Entity Classification Election S-corporation election means Form 2553 was filed.3Internal Revenue Service. Instructions for Form 2553, Election by a Small Business Corporation Keep whichever one applies with your tax file. If you never filed either, you are on the default.
Foundational Records Every LLC Needs
Employer Identification Number
Your EIN is the nine-digit number the IRS issued when you filed Form SS-4. It appears on every tax return and every payroll filing. Multi-member LLCs and any LLC with employees must have one. A single-member LLC with no employees can technically use the owner’s Social Security number, but banks and vendors usually require an EIN anyway.4Internal Revenue Service. About Form SS-4, Application for Employer Identification Number
Operating Agreement
For multi-member LLCs, the operating agreement is the most important internal document at tax time. It sets out how profits and losses are split, how capital contributions are treated, and whether any member receives guaranteed payments. Your preparer needs it to allocate income correctly on each Schedule K-1. Even where a state does not require a written agreement, the IRS expects allocations to follow some documented arrangement.
Business Bank and Credit Card Statements
Pull twelve months of statements for every bank account and credit card used for the business. Statements are the backbone for reconciling deposits against reported revenue and payments against claimed expenses. Keeping business and personal accounts separate matters beyond taxes; commingling funds is one of the fastest ways to weaken the liability protection an LLC provides.
Income and Expense Documentation
Revenue Records
Collect every invoice sent, every sales receipt generated, and every merchant processor statement showing card payments received. These let you reconcile bank deposits against reported sales. Discrepancies between the two are one of the first things the IRS checks in an audit.
Expense Records
Deductible business expenses must be “ordinary and necessary” to your trade: common in your industry and helpful to your business.5Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses Keep the original receipt, vendor invoice, or canceled check for every expense you plan to deduct. Organize by category: rent, utilities, supplies, insurance, professional services, travel, advertising. If you cannot produce documentation during an audit, the IRS disallows the deduction and you owe back tax plus interest.
Depreciation and Asset Records
Equipment, vehicles, furniture, and other long-term assets generally cannot be deducted in full the year you buy them. The cost is spread across the asset’s useful life under the Modified Accelerated Cost Recovery System and reported on Form 4562, Depreciation and Amortization.6Internal Revenue Service. About Form 4562, Depreciation and Amortization
For each depreciable asset, keep the purchase invoice, the date you placed it in service, and any costs to prepare it for use, such as installation, shipping, and setup. You need these records every year you claim depreciation and again when you sell or dispose of the asset.
Two alternatives let you deduct faster. Section 179 allows immediate expensing of qualifying equipment purchases up to $2,560,000 for 2026, with the benefit phasing out once total equipment purchases exceed $4,090,000. The One Big Beautiful Bill Act permanently restored 100 percent bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, letting many LLCs write off the full cost of new equipment in year one.7Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Large first-year deductions draw closer IRS scrutiny, so your purchase records matter even more if you use either method.
Vehicle Records
Business use of a vehicle requires a mileage log recording the date, destination, business purpose, and total miles for each trip. Logs kept after the fact rarely hold up. Vehicle deductions without a contemporaneous log are routinely disallowed on audit.8Internal Revenue Service. Instructions for Form 4562
1099s You Receive and 1099s You Issue
1099s You Receive
Clients or customers who paid your LLC $600 or more should send a Form 1099-NEC (services) or 1099-MISC (other payments, like rent). Keep every 1099 and compare each against your own income records. If a 1099 overstates what you were actually paid, report the correct number and be ready to explain the difference.
If your LLC accepts payments through apps or online marketplaces, you may also receive a Form 1099-K. Under the One Big Beautiful Bill Act, the reporting threshold reverted to more than $20,000 in gross payments across more than 200 transactions per year.9Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill All income is taxable whether or not a 1099-K arrives.
1099s You Issue
Your LLC must issue Form 1099-NEC to every independent contractor, freelancer, or unincorporated vendor paid $600 or more during the year. Keep copies of each 1099-NEC you send along with the transmittal Form 1096 (paper filers only; e-filing skips the 1096). Collect a W-9 from every contractor before you pay them so you have their taxpayer ID in hand when January arrives.
Late information returns trigger escalating penalties: $60 per form within 30 days of the deadline, $130 by August 1, and $340 per form after that. Intentional disregard raises the penalty to $680 per form.10Internal Revenue Service. Information Return Penalties
Owner Compensation Records
How you document money moving from the LLC to its owners depends on classification, and getting this wrong is expensive.
Single-Member LLC (Disregarded Entity)
Money you take out is an owner draw, not a wage. Keep a ledger of the date and amount of each withdrawal. Draws are not deductions on Schedule C; they simply reduce your equity. What appears on your tax return is the LLC’s net profit, not what you actually withdrew.
Multi-Member LLC (Partnership)
Partners can receive guaranteed payments or distributions. Guaranteed payments are fixed amounts paid to a member for services or use of capital, regardless of whether the LLC earned a profit, and they are subject to self-employment tax.11Internal Revenue Service. Entities 1 Distributions are a member’s share of profits and generally are not taxed again if the member has enough basis.
For each member, keep records of guaranteed payment amounts and dates, distribution amounts and dates, and a capital account reconciliation from beginning to end of year. These feed each member’s Schedule K-1.
S-Corporation LLC
An LLC taxed as an S-corporation must pay any owner who works in the business a reasonable salary through payroll before taking distributions. The IRS requires the S-corporation to determine and report an appropriate and reasonable salary for shareholders who receive cash or property from the business.12Internal Revenue Service. S Corporation Employees, Shareholders and Corporate Officers Reasonable means comparable to what someone in the same role would earn elsewhere. Paying yourself $15,000 when the market rate is $80,000 draws IRS attention.
Your payroll file needs a Form W-2 for each owner-employee, payroll registers showing gross pay, withholdings, and net pay, and bank statements confirming paycheck deposits. You also need copies of your quarterly Form 941 filings reporting federal income tax, Social Security, and Medicare withheld from wages.13Internal Revenue Service. About Form 941, Employer’s Quarterly Federal Tax Return Track distributions beyond salary separately; they are generally tax-free up to the shareholder’s basis.
The Federal Return You File
Once the records are assembled, you file the return that matches your classification.14Internal Revenue Service. LLC Filing as a Corporation or Partnership
Disregarded Entity
A single-member LLC does not file a separate business return. Income and expenses go on Schedule C (Profit or Loss From Business), attached to your personal Form 1040.15Internal Revenue Service. Single Member Limited Liability Companies Rental property held in the LLC goes on Schedule E. The result flows into your personal return and is taxed at individual rates.
Partnership
A multi-member LLC files Form 1065, U.S. Return of Partnership Income. It is an information return; the partnership itself does not pay income tax. The form calculates total income, deductions, and credits, then allocates each member’s share on a Schedule K-1.16Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income Each member reports the K-1 numbers on their personal return.
S-Corporation
An LLC that elected S-corporation status files Form 1120-S, U.S. Income Tax Return for an S Corporation. This is also an information return, with a Schedule K-1 issued to each shareholder showing their share of income, losses, deductions, and credits.17Internal Revenue Service. About Form 1120-S, U.S. Income Tax Return for an S Corporation
C-Corporation
An LLC taxed as a C-corporation files Form 1120, U.S. Corporation Income Tax Return, and pays tax on its own net income at the 21 percent federal corporate rate.18Internal Revenue Service. Instructions for Form 1120, U.S. Corporation Income Tax Return Distributions to owners as dividends are taxed again on the owners’ returns.
Self-Employment Tax and Estimated Payments
If your LLC is a disregarded entity or partnership, the net profit passing through to you is generally subject to self-employment tax at a combined 15.3 percent (12.4 percent Social Security plus 2.9 percent Medicare), calculated on Schedule SE and attached to Form 1040.19Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Schedule SE starts from your Schedule C net income or your share of partnership income, so accurate profit-and-loss records matter here too. S-corporation and C-corporation LLCs handle these taxes through payroll withholding instead.
Pass-through owners typically have no employer withholding on business income. If you expect to owe $1,000 or more after withholding and refundable credits, you generally need to make quarterly estimated payments using Form 1040-ES.20Internal Revenue Service. Form 1040-ES, Estimated Tax for Individuals (2026) For a calendar-year taxpayer, the four payments fall on April 15, June 15, September 15, and January 15 of the following year.21Internal Revenue Service. Publication 509 (2026), Tax Calendars Keep confirmations for each payment: bank statements, IRS Direct Pay receipts, or EFTPS records. You will need them when filing to claim credit for what you already paid.
You avoid underpayment penalties by paying at least 90 percent of the current-year liability or 100 percent of the prior-year liability through estimates and withholding. If prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110 percent.20Internal Revenue Service. Form 1040-ES, Estimated Tax for Individuals (2026)
Qualified Business Income Records
If your LLC is a disregarded entity, partnership, or S-corporation, you may qualify for the Section 199A deduction of up to 20 percent of qualified business income on your personal return. The One Big Beautiful Bill Act made the deduction permanent.
Below certain income thresholds, the calculation is straightforward. For 2026, limitations begin phasing in at roughly $201,750 in taxable income for single filers and $403,500 for married couples filing jointly. Above those thresholds, the deduction can be limited by W-2 wages paid by the business and the cost basis of qualified property the business owns. If you are anywhere near those levels, keep total W-2 wages paid and the unadjusted basis of depreciable assets on hand; your preparer needs both.
Service-based professions including law, accounting, consulting, medicine, and financial services face an additional restriction: the deduction phases out entirely once taxable income reaches roughly $276,750 for single filers or $553,500 for joint filers in 2026.
Filing Deadlines and Late Penalties
Deadlines vary by classification, and several fall earlier than owners expect:21Internal Revenue Service. Publication 509 (2026), Tax Calendars
- Partnerships (Form 1065) and S-corporations (Form 1120-S) are due by the 15th day of the third month after the tax year ends: March 15 for calendar-year filers. Form 7004 buys an automatic six-month extension of the filing deadline but not the payment deadline.
- C-corporations (Form 1120) are due by the 15th day of the fourth month after year-end: April 15 for calendar-year filers.
- Disregarded entities (Schedule C on Form 1040) are due April 15, alongside your personal return.
Partnership and S-corporation late penalties multiply by owner count. For recent tax years, the penalty has run $255 per partner or shareholder for each month the return is late, up to 12 months.22Internal Revenue Service. Instructions for Form 1065 A four-member LLC partnership three months late owes $3,060 in penalties before any interest on unpaid tax. The amount is adjusted annually for inflation.23Office of the Law Revision Counsel. 26 U.S. Code 6698 – Failure to File Partnership Return
State Filings Are Separate
Federal is not the whole picture. Most states require a separate income tax return mirroring the federal filing for your classification, and many charge an annual franchise tax or registration fee whether or not the LLC turned a profit. Fees vary widely, from under $100 in some states to several hundred dollars or more in others. If you do business in multiple states, you may owe returns and taxes in each state where activity is significant, not only the state of formation. Check the secretary of state and revenue department in every state where you operate.
How Long to Keep the Documents
The IRS recommends these retention periods:24Internal Revenue Service. How Long Should I Keep Records?
- Three years for most income tax records, measured from the filing date or due date, whichever is later.
- Four years for employment tax records (W-2s, Form 941 filings, payroll registers), measured from the date the tax was due or paid, whichever is later.
- Six years if you underreported income by more than 25 percent of gross income shown on the return, because the IRS has that long to audit it.
- Seven years if you claimed a deduction for worthless securities or bad debts.
- Asset records through the retention period for the year you sell or dispose of the asset. Equipment bought in 2020 and sold in 2030 needs records kept through at least 2033.
Most tax professionals keep everything at least seven years. Storage is cheap. Reconstructing records from scratch when the IRS asks is not.