Whether you file your LLC and personal taxes together depends on how the IRS classifies your LLC. A single-member LLC with no special election is a “disregarded entity,” and everything gets reported on your personal Form 1040 in a single combined filing. A multi-member LLC, or one that has elected S-corporation or C-corporation treatment, files its own separate business return first; from there, the income either flows onto your personal return or stays with the entity. So there is no universal answer, but there is a clear one once you know your classification.
Single-Member LLC: One Combined Filing
If you own your LLC by yourself and have not filed an election to change its tax treatment, the IRS ignores the LLC wrapper for federal income tax purposes and taxes you the same way it taxes a sole proprietor.1Internal Revenue Service. Single Member Limited Liability Companies The LLC does not file its own federal income tax return. You file one return, your 1040, with the business activity attached.
For an active business, that attachment is Schedule C (Profit or Loss From Business).2Internal Revenue Service. Limited Liability Company – Possible Repercussions Rental income goes on Schedule E instead, and farm income on Schedule F. Net profit flows from whichever schedule applies straight into your 1040.
That profit is also subject to self-employment tax, calculated on Schedule SE. The rate is 15.3%, which is 12.4% for Social Security plus 2.9% for Medicare.3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) You cover both the employer and employee halves yourself. The Social Security portion applies only to the first $184,500 of combined earnings in 2026.4Social Security Administration. Contribution and Benefit Base Medicare has no cap.
One boundary worth knowing. A disregarded entity is still treated as a separate entity for employment tax purposes. If your LLC has employees, it needs its own EIN, and payroll taxes get reported and paid under the LLC’s name and EIN rather than your Social Security number.1Internal Revenue Service. Single Member Limited Liability Companies So “one combined filing” refers to income tax, not payroll tax.
Multi-Member LLC: A Separate Business Return, Then Your 1040
An LLC with two or more owners defaults to partnership tax treatment.5Internal Revenue Service. LLC Filing as a Corporation or Partnership The business files Form 1065, the U.S. Return of Partnership Income. That return is informational; the LLC itself does not pay federal income tax on the profits. Income passes through to the owners.
Form 1065 generates a Schedule K-1 for each member showing that member’s share of profits, losses, and other tax items. You take the numbers from your K-1 and report them on Schedule E of your personal Form 1040.5Internal Revenue Service. LLC Filing as a Corporation or Partnership So you’re looking at two returns: the LLC’s 1065 and your personal 1040.
Your distributive share of partnership profits is generally subject to the 15.3% self-employment tax, as are any guaranteed payments made to you for services regardless of whether the LLC turned a profit.3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) There is a statutory exception for limited partners, whose distributive share (other than guaranteed payments for services) is excluded from self-employment tax.6Office of the Law Revision Counsel. 26 USC 1402 – Definitions How that exception applies to LLC members who actively participate in the business remains a gray area the IRS has not fully resolved through final regulations.
You can only deduct your share of LLC losses up to your adjusted basis in the partnership interest. Losses beyond that basis carry forward to future years when you have enough basis to absorb them.7Internal Revenue Service. New Limits on Partners’ Shares of Partnership Losses
Late Filing Penalty on the 1065
Missing the Form 1065 deadline is expensive: $255 per month (or partial month) for each partner in the LLC, for up to 12 months.8Internal Revenue Service. Failure to File Penalty A four-member LLC that files six months late owes $6,120. The penalty applies even though the entity itself owes no tax, which catches a lot of new multi-member LLCs off guard.
S-Corp Election: Two Returns, With a Salary in the Middle
Any LLC, whether single-member or multi-member, can elect S-corporation tax treatment by filing Form 2553. The deadline is no later than two months and 15 days after the start of the tax year the election is to take effect (March 15 for calendar-year filers), or anytime during the preceding tax year.9Internal Revenue Service. About Form 2553, Election by a Small Business Corporation
An S-Corp LLC files Form 1120-S each year. Like a partnership, the entity does not pay federal income tax.10Internal Revenue Service. About Form 1120-S, U.S. Income Tax Return for an S Corporation Income passes through to owners on a Schedule K-1, and each owner reports it on Schedule E of the personal 1040. Two returns again: the 1120-S and your 1040.
The reason owners elect S-Corp treatment is payroll tax. An owner-employee has to receive a reasonable W-2 salary for services, and that salary is subject to normal payroll taxes. Profit distributed to the owner beyond the salary is not subject to the 15.3% self-employment tax.11Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues On a profitable business, the savings add up quickly.
The IRS is alert to abuse. Set your salary too low to inflate the tax-free distribution and the agency can reclassify distributions as wages, then add back payroll tax and penalties. Factors it weighs include your training, duties, hours devoted to the business, what comparable businesses pay for similar work, and whether the company’s income is primarily generated by your personal efforts.11Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues An LLC earning $300,000 almost entirely from the owner’s labor and paying a $40,000 salary is inviting scrutiny.
C-Corp Election: The One Case Where Nothing Flows Through
An LLC can also elect C-corporation treatment by filing Form 8832.12Internal Revenue Service. About Form 8832, Entity Classification Election This is the biggest departure from the default. The LLC becomes a fully separate taxpayer, and its income does not automatically appear on your personal return.
The LLC files Form 1120 and pays corporate income tax at a flat 21% on its profits.13Internal Revenue Service. Instructions for Form 1120 (2025) You only report income on your personal 1040 when the corporation actually pays you, either as W-2 wages for your work or as dividends. Dividends are reported on Form 1099-DIV and taxed at qualified dividend rates (typically 0%, 15%, or 20% depending on your bracket).
The trade-off is double taxation. Profits are taxed at 21% at the corporate level, then taxed again when distributed to you as dividends. C-Corp treatment tends to fit narrower situations: retaining and reinvesting earnings, attracting outside investors, or an owner whose personal rate on pass-through income would exceed the combined corporate-plus-dividend rate.
Estimated Taxes Between Now and April
Whenever LLC income passes through to your personal return, no taxes are withheld along the way. You cover them through quarterly estimated payments. The IRS requires estimated payments if you expect to owe $1,000 or more for the year after subtracting withholding and refundable credits.14Internal Revenue Service. 2026 Form 1040-ES – Estimated Tax for Individuals
The 2026 quarterly deadlines are April 15, June 15, September 15, and January 15, 2027.14Internal Revenue Service. 2026 Form 1040-ES – Estimated Tax for Individuals You can skip the January payment if you file your full 2026 return and pay the balance by February 1, 2027.
To avoid the underpayment penalty, pay at least 90% of your current year’s tax or 100% of what you owed last year, whichever is smaller. If your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110%.15Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Missing a quarter doesn’t just mean a bigger April bill; the IRS charges interest on each missed installment from its own due date. S-Corp owners who take a W-2 salary have a partial advantage, since payroll withholding on that salary reduces the amount owed through estimates.
Filing Deadlines and the Order of Operations
The deadline depends on which return the LLC files. For the 2025 tax year (filed in 2026):
- Form 1065 (partnerships) and Form 1120-S (S corporations) are due March 16, 2026. The usual March 15 date lands on a Sunday in 2026.
- Form 1040 (personal) and Form 1120 (C corporations) are due April 15, 2026.16Internal Revenue Service. When to File
Form 7004 grants an automatic six-month extension for business returns (1065, 1120-S, and 1120), and Form 4868 grants a six-month extension for the personal 1040.16Internal Revenue Service. When to File An extension only extends time to file. Any tax owed is still due by the original date, and interest runs from that date on any unpaid balance.
For multi-member and S-Corp LLCs, the sequence matters. The business return is due a full month before the personal return because your K-1 has to exist before you can finish your 1040. If the business return runs late, your personal return almost certainly follows.
State Taxes Are a Separate Question
Everything above is federal. Most states impose their own income tax on LLC profits, and the rules don’t always mirror the federal treatment. Some states charge LLCs an annual franchise tax or gross receipts tax whether the business earned a profit or not. Some require a separate state-level return even for a disregarded single-member LLC. Check your state’s rules before assuming the federal answer carries over.