Form 1065 vs 1120-S: Complete LLC Business Tax Return Walkthrough

Which Form Does Your LLC File?

Your LLC's federal business tax return depends on your tax classification:

| LLC Type | Default Tax Classification | Business Return | |---|---|---| | Single-member LLC | Disregarded entity | None (Schedule C on 1040) | | Multi-member LLC | Partnership | Form 1065 | | LLC electing S-Corp | S-Corporation | Form 1120-S | | LLC electing C-Corp | C-Corporation | Form 1120 |

This post walks through 1065 (multi-member LLCs taxed as partnerships) and 1120-S (LLCs that elected S-Corp taxation via Form 2553). These are the two business returns most LLC owners encounter.

Form 1065: Partnership Return Overview

Form 1065 is filed by multi-member LLCs taxed as partnerships. It: - Reports the LLC's income, deductions, gains, and losses - Allocates these items to each member via Schedule K-1 - Due March 15 (or next business day) for calendar-year LLCs - Does NOT pay tax at the entity level — members pay tax on their K-1 share

Form 1065 Structure - Pages 1-5: income, deductions, balance sheet - Schedule B: other information (ownership percentages, tax matters partner, etc.) - Schedule K: total partnership items (combined for all members) - Schedule K-1: one per member (their share of items) - Schedule L: balance sheet per books - Schedule M-1: reconciliation of book income to tax income - Schedule M-2: capital account analysis - Form 8825: rental real estate (if applicable) - Form 4562: depreciation (if applicable)

The Most Important Lines of 1065

**Line 1a-1c: Gross receipts** Revenue before returns and allowances. If this differs from your QuickBooks gross revenue, find out why. Common issues: - Sales tax included (should be excluded) - Inter-company transfers misclassified as revenue - Refunds netted at the wrong level

**Line 3: Gross profit** Revenue minus cost of goods sold (COGS). For service businesses, COGS is usually minimal or zero. For product businesses, COGS is a huge deductible category.

**Line 8: Total income** After COGS and other income (like rental, interest on business accounts, or capital gains). This flows to the K-1s.

**Lines 9-20: Deductions** Includes salaries/wages, guaranteed payments to partners, repairs, rent, taxes (state/local, but not federal), interest, depreciation, depletion, employee benefit programs, retirement plans, and other deductions.

Key focus: **Line 10: Guaranteed payments**. These are fixed payments to members regardless of partnership income. They're deductible to the LLC, but taxable ordinary income to the member (plus SE tax) on K-1. Often used for active managing partners.

**Line 22: Ordinary business income/loss** The bottom-line operating result. This flows to K-1 Box 1.

Schedule K: Partnership Total

Combines ALL items before allocation: - Box 1: Ordinary business income - Box 2: Net rental real estate income - Box 4: Guaranteed payments - Box 5: Interest income - Box 6: Dividends - Box 8: Net short-term capital gain - Box 9a-c: Net long-term capital gain - Box 13: Other deductions (charitable contributions, Section 179, etc.) - Box 14: Self-employment earnings (very important — flows to K-1 Box 14 for SE tax) - Box 17: AMT items - Box 20: QBI items (Z box, especially)

Schedule K-1 (One Per Member)

The K-1 is what each member uses to prepare their personal tax return. Key boxes:

- **Box 1 (Ordinary business income)**: goes on Schedule E of member's 1040 - **Box 4 (Guaranteed payments)**: also Schedule E + SE income - **Box 14 (Self-employment earnings)**: flows to Schedule SE (where you calculate SE tax) - **Box 20 Code Z (QBI)**: for the Section 199A deduction - **Box 13 Code W (Section 179 deduction)**: expensing of equipment - **Capital account analysis**: beginning balance + contributions + income share - distributions - expense share = ending balance

Common Form 1065 Mistakes

1. **Misclassifying guaranteed payments**: paying active members as "partner distributions" instead of guaranteed payments. Distributions aren't deductible to the LLC; guaranteed payments are. 2. **Incorrect self-employment earnings calculation**: Box 14 needs to reflect the member's SE income accurately. Limited partners and non-managing members often shouldn't have SE income; managing members usually should. 3. **Bad capital accounts**: members' capital accounts must tie. If you sum all members' ending capital accounts, it should equal partnership net assets. Mismatch = sloppy bookkeeping + potential IRS scrutiny. 4. **Missing K-1 codes**: the K-1 has dozens of codes for various items (tax credits, basis adjustments, etc.). Missing codes cause member-level errors. 5. **Wrong allocations**: default is pro-rata by ownership %, but partnership agreements often specify different allocations (special allocations, waterfall, etc.). These must comply with IRC §704(b) "substantial economic effect" rules. 6. **Not filing Schedules K-2 and K-3**: required as of 2021 for partnerships with ANY international activity (even passive foreign investments held by one member). Many small LLCs skip these and get IRS notices.

Form 1120-S: S-Corp Return Overview

Filed by LLCs that elected S-Corp taxation via Form 2553 (or by actual S-corporations). It: - Reports income, deductions, gains, losses at the entity level - Allocates these to shareholders via Schedule K-1 (similar to 1065 but different form) - Due March 15 (or next business day) for calendar-year entities - Entity pays no federal income tax, but may owe state entity tax

Form 1120-S Structure - Page 1: income, deductions, tax, payments - Page 2: Schedule B (other information) - Page 3: Schedule K (total items) - Page 4: Schedule L (balance sheet) and M-1 (reconciliation) - Page 5: Schedule M-2 (accumulated adjustments account) - Schedules K-1: one per shareholder - Form 1125-A: COGS (if applicable) - Form 1125-E: officer compensation (if required) - Form 4562: depreciation

Critical Differences from 1065

**1. No guaranteed payments** S-Corps don't have guaranteed payments. Instead, owner-employees are paid W-2 wages. This is why S-Corps save on SE tax — W-2 portion is subject to FICA, but distribution portion is not.

**2. Reasonable compensation requirement** Every owner-employee must receive "reasonable" W-2 wages for services rendered. The IRS can reclassify low-salary-high-distribution arrangements. Factors: training, responsibility, time devoted, comparable salaries for similar work, distributions, compensation history.

**3. Officer compensation reported on 1125-E** If gross receipts exceed $500K, you must file Form 1125-E detailing officer compensation. The IRS scrutinizes this for reasonable comp compliance.

**4. Accumulated Adjustments Account (AAA)** The AAA tracks undistributed earnings. Distributions first reduce AAA (tax-free up to basis), then come from other sources (potentially taxable). This is critical if the S-Corp has accumulated earnings.

The Most Important Lines of 1120-S

**Line 1a-1c: Gross receipts** Same as 1065 — revenue before returns.

**Line 3: Gross profit** Revenue minus COGS.

**Line 7: Officer compensation** YOUR W-2 salary as owner-employee. If under $500K revenue, just reports on this line. If over $500K, Form 1125-E is required.

**Line 8: Salaries and wages (other than officers)** Non-owner employees' wages.

**Line 12: Taxes and licenses** State income/franchise tax paid by the entity, payroll taxes (employer portion), business licenses.

**Line 21: Ordinary business income/loss** The bottom-line operating result. Flows to K-1 Box 1.

Schedule K-1 (1120-S Version)

Similar structure to partnership K-1:

- **Box 1 (Ordinary business income)**: Schedule E of 1040 - **Box 2 (Net rental real estate income)**: Schedule E - **Box 5a (Ordinary dividends)**: rare for S-Corps - **Box 13 (Credits)**: various credit codes - **Box 16 (International)**: Schedule K-2/K-3 items - **Box 17 Code V (QBI)**: Section 199A information

Notably MISSING from S-Corp K-1 (vs partnership K-1): - Box 14 (self-employment earnings) — N/A for S-Corps because owner-employee compensation is W-2 already - Guaranteed payments — N/A

Distributions and Basis

S-Corp shareholders have a "basis" that matters for: - Tax-free distributions (distributions up to basis aren't taxed) - Deductibility of losses (can't deduct losses beyond basis) - Sale of S-Corp interest (capital gain = sale price - basis)

Basis calculation (simplified): - Starting basis (original investment) - + income allocated to shareholder (K-1 Box 1) - - distributions received - + debt basis (loans you personally made to the S-Corp — rare) - = ending basis

Your basis must be positive to deduct losses. If losses exceed basis, they're suspended until you have basis again (via new income or contributions).

Common Form 1120-S Mistakes

1. **Unreasonable owner compensation**: paying yourself $20K salary on $500K profit is a red flag. IRS reclassifies distributions as wages, assesses payroll tax + penalties. 2. **Not tracking AAA properly**: distributions in excess of AAA can trigger ordinary income or capital gain depending on corporate history. 3. **Missing Form 1125-E**: over $500K revenue requires this officer compensation detail form. 4. **Health insurance not in W-2**: S-Corp owners' health insurance premiums should be included in W-2 Box 1 (income) and deducted above-the-line on 1040. If missed, you lose the deduction. 5. **Passive activity losses**: if owners don't materially participate, losses may be limited by passive activity rules. Material participation test is critical. 6. **State tax nexus misses**: S-Corps that do business in multiple states often owe state franchise/income tax in each. Missing states creates back-tax exposure.

State-Specific Entity Tax Traps

Both 1065 and 1120-S pass through federal tax, but some states impose entity-level taxes:

States with entity-level LLC/partnership tax: - **California**: $800 minimum franchise tax + 1.5% S-Corp tax on top of federal + LLC gross receipts fees ($0-$11,790) on LLCs taxed as partnerships - **Texas**: franchise tax on entities with $1.23M+ revenue - **New York**: NY S-Corp franchise tax + city NY S-Corp tax if NYC based - **Tennessee**: franchise + excise tax - **Illinois**: replacement tax 1.5% on S-Corp net income - **New Jersey**: corporate business tax on S-Corps - **Ohio**: CAT tax on gross receipts - **Pennsylvania**: capital stock franchise (expired 2016 for LLCs)

Check YOUR state's rules. Many "no state income tax" states still charge entities.

PTET Elections (SALT Cap Workaround)

Since the TCJA capped state/local tax deduction at $10K personally, many states created Pass-Through Entity Tax (PTET) elections. The LLC/S-Corp pays state tax at the entity level (deductible federally as business tax), and owners get a state tax credit.

States with PTET elections (as of 2024): - Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Georgia, Hawaii, Idaho, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Mississippi, Montana, Nebraska, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Rhode Island, South Carolina, Utah, Virginia, West Virginia, Wisconsin

If you live in one of these states with significant state tax, PTET can save thousands. Talk to a CPA — it usually requires an annual election.

Reading Your Own Return

When your CPA sends you your Form 1065 or 1120-S to sign:

30-Minute Review Checklist

1. **Compare gross revenue** on the return vs your QuickBooks total revenue 2. **Check deductions** against your expense categories — are all major categories captured? 3. **Review capital accounts** (partnerships) or AAA (S-Corps) for proper beginning/ending 4. **Match K-1 boxes** to your expected ownership % and income 5. **Look for QBI info** — should be in Box 20 Code Z (1065) or Box 17 Code V (1120-S) 6. **Check officer comp** on 1120-S — does it match what you paid yourself in W-2 wages? 7. **Verify depreciation** on Form 4562 ties to your fixed asset additions 8. **Look at Schedule L balance sheet** — does it roughly match your book balance sheet?

If anything looks wildly off, ask your CPA. They'd rather answer questions than rework the return after filing.

Summary: When Each Form Is Your Return

**File Form 1065 if your LLC is**: - Multi-member - Taxed as a partnership (default for multi-member LLCs) - Not elected S-Corp or C-Corp

**File Form 1120-S if your LLC**: - Elected S-Corp via Form 2553 AND was accepted - Whether single- or multi-member - Has paid "reasonable" W-2 wages to owner-employees

**File Schedule C (no business return) if your LLC**: - Is single-member AND - Hasn't elected S-Corp or C-Corp AND - Is taxed as a disregarded entity

Switching Between Forms

You CAN change your LLC's tax classification, but it's not casual:

- Disregarded → S-Corp: file Form 2553 (usually before March 15 for current-year effect) - Partnership → S-Corp: file Form 2553 (same timing) - S-Corp → back to default: file Form 1120-S with statement revoking election, effective next tax year OR Form 8832 election change (must wait 5 years to re-elect S-Corp after this) - Any → C-Corp: file Form 8832 election

These changes have tax consequences — deemed sales, triggered gains, changed basis. Talk to a CPA before switching.

Final Word

Form 1065 and Form 1120-S are complex, but they're not magic. A few hours reviewing your return and asking your CPA questions will save you thousands over your business life. It'll also make you a better business owner — understanding the tax treatment of every decision helps you structure transactions more tax-efficiently upfront.

If you haven't filed yet because you don't have an LLC, [start your formation with FormifyAI](/sign-up) — we handle the LLC filing, EIN, and operating agreement. When tax time comes, your business return is dramatically simpler to prepare.

To see whether the S-Corp election pays off for you (and therefore whether you'd be filing 1065 or 1120-S), run the [S-Corp savings calculator](/tools/s-corp-savings).