Running Your Business in the U.S. — 2026 Tax, Payroll, and Compliance Guide

Hanmi CPA · Compliance Guide

Running Your Business in the United States
2026 Tax, Payroll & Compliance Guide

A practical reference covering bookkeeping, payroll, sales tax, owner compensation, and annual filing obligations for U.S. small business owners under 2026 rules.

2026 Rules Payroll Compliance Sales Tax Deductions Year-End Planning

Section 01

Overview

Running a business in the United States requires ongoing compliance with federal, state, and local regulations. This guide explains the essential operational, financial, and tax responsibilities that apply after a business is formed.

Readers will learn how to manage bookkeeping, payroll, sales tax, owner compensation, and annual filings under 2026 rules. The focus is on practical compliance steps that U.S. taxpayers must follow to operate a business efficiently and avoid IRS or state penalties. Where applicable, this guide reflects changes enacted by the One Big Beautiful Bill Act (OBBBA), signed July 2025, which introduced several significant updates effective for the 2026 tax year.

Section 02

Why This Matters

Once a business is operational, IRS requires accurate recordkeeping, timely tax filings, and proper classification of income and expenses. Failure to comply can result in payroll tax penalties, disallowed deductions, or loss of liability protection. States impose additional obligations including sales tax collection, franchise taxes, and annual reports.

⚠ 2026 Changes to Watch: The OBBBA restored 100% bonus depreciation for qualifying property placed in service after January 19, 2025, and raised the 1099-NEC reporting threshold from $600 to $2,000 effective for the 2026 tax year. Businesses operating under prior-year assumptions should verify their deduction and information-reporting strategies.

Proper operational management ensures tax efficiency, reduces audit exposure, and supports long-term business stability.

Section 03

2026 Key Rates & Limits

The following figures are confirmed for the 2026 tax year. Payroll and deduction planning should be updated to reflect these amounts.

Social Security Wage Base

$184,500

Up from $176,100 in 2025. SS tax (6.2%) stops at this threshold. No cap on Medicare.

FICA Rate (Employer + Employee)

7.65%

6.2% Social Security + 1.45% Medicare. Each party pays 7.65%; self-employed pay the full 15.3%.

Additional Medicare Tax

0.9%

Applies to wages above $200,000 (single) / $250,000 (MFJ). Unchanged for 2026.

Bonus Depreciation (OBBBA)
100%
Restored from prior phase-down. Applies to qualifying property acquired after Jan. 19, 2025. No dollar cap.

Section 179 Limit
$2,560,000
Phase-out begins at $4,090,000 of total qualifying property. Limited to taxable business income.

1099-NEC Threshold (OBBBA)
$2,000
Raised from $600. Applies to payments made on or after Jan. 1, 2026. Inflation-adjusted from 2027.

Cash Method Gross Receipts Limit

~$30M

Inflation-adjusted 3-year average. Businesses below this threshold may generally use the cash method.

SEP-IRA Contribution Limit

25%

Up to 25% of compensation; annual dollar limit inflation-adjusted. Check IRS.gov for 2026 cap.

Section 04

Key Rules & Concepts

A. Bookkeeping & Recordkeeping (IRS Publication 583)

Businesses must maintain complete and contemporaneous records — invoices, receipts, bank statements, payroll records, and mileage logs.
Records must be retained for a minimum of 3 years from the date the return was filed. Payroll records must be retained for at least 4 years; records related to asset basis should be kept as long as the asset is owned, plus 3 years.
Bookkeeping should be reconciled monthly — not reconstructed at year-end — to ensure accuracy and audit readiness.

B. Accounting Method

The cash method is available to most small businesses with average annual gross receipts of $30 million or less (2026 inflation-adjusted threshold). Under the cash method, income is recognized when received and expenses when paid.
The accrual method is generally required for C-Corporations with gross receipts above the threshold and for certain inventory-based businesses. Income is recognized when earned, regardless of when payment is received.
Once selected, the accounting method must be applied consistently. A change requires IRS consent via Form 3115(Application for Change in Accounting Method).

C. Owner Compensation Rules

S-Corp Owner

IRS requires a reasonable salary before any distributions are taken. Salary is subject to payroll tax; distributions above the salary are not. Low or zero salary with high distributions is a recognized IRS audit trigger.

LLC Member (Partnership)

Members take draws against their capital accounts, not wages. All net income allocable to active members is generally subject to self-employment tax regardless of whether it is distributed.

C-Corp Owner-Employee

Receives W-2 wages subject to payroll tax. Additional profits distributed as dividends are taxed at qualified dividend rates but are not deductible by the corporation — the so-called "double taxation" of C-Corp income.

Sole Proprietor

No separate salary — all net profit flows directly to the owner and is subject to both income tax and self-employment tax(15.3% on the first $184,500; 2.9% above that for 2026).

D. Sales Tax & Economic Nexus

Following South Dakota v. Wayfair (2018), states may require sales tax registration based on economic nexus — typically $100,000 in sales or 200 transactions — even without a physical presence.
Marketplace facilitator rules apply to online sellers using platforms such as Amazon, eBay, or Etsy; the platform generally collects and remits sales tax on behalf of third-party sellers in participating states.
Sales tax returns must be filed even when no sales occurred during the filing period. Failure to file zero-dollar returns results in penalties in most states.
Exemption certificates must be collected from wholesale or resale customers and retained on file to document tax-exempt transactions.

E. State Annual Obligations

Most states require an annual report or statement of information — due dates and fees vary by state and entity type.
Franchise taxes are imposed in many states (notably California and Delaware) regardless of profitability. California's minimum franchise tax is $800 per year for LLCs and corporations.
A registered agent with a physical address in the state of formation must be maintained at all times. Failure to maintain a registered agent can result in administrative dissolution.

Section 05

Step-by-Step Guidance

Maintain Proper Books and Records

Use accounting software (QuickBooks, Xero, or equivalent) and record transactions as they occur.
Reconcile bank and credit accounts monthly against the general ledger.
Track income, expenses, assets, and liabilities separately from personal accounts.
Retain all supporting documents — receipts, invoices, contracts — per IRS Publication 583 retention schedules.

Manage Payroll Correctly

Register for federal and state payroll accounts before the first payroll is processed.
Withhold federal income tax, Social Security (6.2% up to $184,500), and Medicare (1.45%) from each paycheck.
Deposit withheld taxes according to the IRS deposit schedule — semi-weekly or monthly based on lookback period liability.
File Form 941(quarterly payroll return) by April 30, July 31, October 31, and January 31.
Issue W-2s to all employees by January 31 each year.
For S-Corp owners: determine reasonable salary using industry compensation benchmarks before year-end.

Comply with Sales Tax Requirements

Identify all states where the business has physical or economic nexus and register for sales tax permits.
Collect sales tax at the correct rate at point of sale — rates vary by state, county, and product type.
File sales tax returns on the required schedule (monthly or quarterly); file even when no sales occurred.
Collect and retain exemption certificates for wholesale or resale customers.

Track Owner Contributions & Distributions

LLC: Maintain capital accounts for each member reflecting contributions, allocations of income/loss, and distributions.
S-Corp: Track each shareholder's adjusted basis annually — basis determines whether distributions are tax-free returns of capital or taxable income.
C-Corp: Document dividend declarations with board resolutions; maintain retained earnings records.

Prepare for Annual Federal & State Filings

File the appropriate federal income tax return: Schedule C (sole proprietor), Form 1065 (partnership), Form 1120-S (S-Corp), or Form 1120 (C-Corp).
File state income tax return and pay any state franchise tax by the applicable deadline.
File annual report or statement of information with the Secretary of State.
Issue Form 1099-NEC to contractors paid $2,000 or more during 2026 by January 31, 2027.

Implement Internal Controls

Segregate bookkeeping duties from payment authorization where possible to reduce fraud risk.
Maintain written expense reimbursement policies and require receipts for all reimbursable expenses.
Document major business decisions — contracts, asset purchases, ownership changes — with supporting records.

Conduct Year-End Tax Planning

Review estimated tax payments made year-to-date and make any required Q4 catch-up payment by January 15.
Evaluate Section 179 expensing (up to $2,560,000) and 100% bonus depreciation for equipment placed in service during the year.
Consider retirement plan contributions — SEP-IRA contributions can be made up to the tax return due date including extensions; Solo 401(k) must be established by December 31.
Analyze S-Corp reasonable salary levels before December 31; adjustments cannot be made retroactively after year-end.

Section 06

Key Deductions & Depreciation — 2026 Rules

IRS allows businesses to deduct ordinary and necessary business expenses. The following table summarizes the most significant deduction categories and their 2026 rules, including OBBBA changes.

Deduction / Rule	2026 Limit / Rate	Key Requirements & Notes
Section 179 Expensing	Up to $2,560,000	Phase-out begins at $4,090,000 in total property. Cannot exceed taxable business income; unused amounts carry forward. Elected on Form 4562.
Bonus Depreciation (IRC §168(k))	100%	OBBBA restored full 100% for qualifying property acquired after Jan. 19, 2025. No dollar cap; can create or increase a net operating loss. Applied after Section 179.
Home Office Deduction	Actual expenses or simplified method ($5/sq ft, max 300 sq ft)	Space must be used regularly and exclusively for business. Not available to employees; available to self-employed and business owners.
Vehicle Deduction	Actual expenses or standard mileage rate	Contemporaneous mileage log required. Luxury auto limits apply to passenger vehicles. Heavy SUVs (GVWR >6,000 lbs) may qualify for Section 179 or bonus depreciation.
Retirement Plan Contributions	SEP-IRA: 25% of compensation; Solo 401(k): employee + employer portions	SEP-IRA can be established and funded up to tax return due date (including extensions). Solo 401(k) must be established by December 31 of the plan year.
QBI Deduction (IRC §199A)	Up to 20% of qualified business income	Available to pass-through entity owners. Subject to W-2 wage and unadjusted basis limitations for higher-income taxpayers. Does not apply to C-Corps.
Meals Deduction	50% of ordinary and necessary business meals	Business purpose must be documented. Entertainment expenses are generally nondeductible. Employer-provided meals on business premises may qualify for 50% deduction.
Start-Up Cost Amortization	Up to $5,000 immediate deduction; remainder amortized over 180 months	Applies to costs incurred before the business begins active operations. Phase-out applies if total start-up costs exceed $50,000.

Section 179 vs. Bonus Depreciation: IRS requires Section 179 to be applied first, followed by bonus depreciation on any remaining basis. Section 179 is limited to taxable business income and cannot create a loss; bonus depreciation has no such limitation and can generate a net operating loss that carries forward.

Section 07

Practical Examples

Case 01 S-Corp Owner Managing Payroll & Distributions

A marketing consultant operates through an S-Corporation with projected net income of $125,000. IRS requires her to pay herself a reasonable salary before taking distributions. Based on industry benchmarks for her services, a salary of $85,000 is determined to be reasonable.

Salary: $85,000 — subject to Social Security (6.2% × $85,000 = $5,270 employee share) and Medicare taxes
Distributions: $40,000 — not subject to payroll tax, generating meaningful FICA savings compared to sole proprietor treatment
Quarterly payroll returns (Form 941) filed; W-2 issued by January 31
Annual return: Form 1120-S with Schedule K-1

❌ Incorrect

Taking all $125,000 as distributions with no payroll. IRS may reclassify distributions as wages and assess back FICA taxes, interest, and failure-to-deposit penalties.

✓ Correct

Establish a documented reasonable salary, process payroll throughout the year, file quarterly Form 941 returns, and take additional profits as distributions above the salary.

Case 02 Retail Store with Multi-State Sales Tax Obligations

A small retail store sells taxable goods both in-store (State A) and through an online store that ships to customers in State B, where annual sales exceed $100,000 — triggering economic nexus. The business must register for and collect sales tax in both states.

Registers for a sales tax permit in both states before first sale in each
Collects sales tax at the applicable state and local rate at point of sale
Files monthly sales tax returns in both states; maintains resale certificates for wholesale purchases
Files zero-dollar returns in months with no taxable sales

❌ Incorrect

Not registering in State B because the business has no physical presence there, or skipping zero-dollar return filings. Both result in penalties, back taxes, and potential state audits.

✓ Correct

Monitor sales volume in every state, register when economic nexus thresholds are met, and file all required returns — including zero-dollar returns — on schedule.

Case 03 LLC Partners Tracking Capital Accounts & Basis

Two partners form an LLC to operate a service business, each contributing $50,000 of initial capital. Profits are allocated 60/40 per the operating agreement. At year-end, the LLC earns $80,000 of net income.

Partner A's share: $48,000 (60%); Partner B's share: $32,000 (40%)
Each partner's capital account is updated: starting balance + income allocation − distributions
Each partner must make individual estimated tax payments based on their Schedule K-1 income
Basis tracking determines whether future distributions are tax-free returns of capital

❌ Incorrect

Partners taking draws without updating capital accounts or tracking adjusted basis. This results in incorrect distribution reporting, potential overstatement of tax-free distributions, and errors on Schedule K-1.

✓ Correct

Maintain a capital account ledger for each partner in the LLC books, reconcile to Form 1065 Schedule L at year-end, and update basis worksheets annually to reflect income allocations and distributions.

Section 08

Common Mistakes

1 Commingling personal and business funds. Using a personal bank account for business transactions undermines liability protection and makes expense documentation — and audit defense — significantly more difficult. IRS Publication 583 recommends a dedicated business account from the date of formation.
2 Not reconciling bank accounts regularly. Bookkeeping reconstructed at year-end is error-prone and fails to catch fraud, duplicate payments, or classification mistakes in time to correct them.
3 Misclassifying employees as independent contractors. IRS applies a multi-factor test (behavioral control, financial control, and type of relationship) to determine worker status. Misclassification exposes the business to back payroll taxes, interest, and penalties under IRC §3509.
4 Failing to run payroll for S-Corp owners. Taking distributions without a reasonable salary is one of the most common S-Corp compliance errors. IRS may reclassify all distributions as wages and assess unpaid FICA taxes plus penalties.
5 Not filing sales tax returns in nexus states. Economic nexus rules require registration and filing even without a physical presence. Unfiled returns accumulate penalties; many states also charge interest from the original due date.
6 Poor documentation for deductions. IRS requires taxpayers to substantiate deductions with contemporaneous records. Home office, vehicle, and meals deductions are high-audit-risk categories where documentation failures commonly result in disallowance.
7 Not tracking basis for LLC or S-Corp owners. Failure to maintain annual basis calculations leads to incorrectly treating taxable distributions as tax-free, or disallowing loss deductions that the owner is actually entitled to claim.
8 Missing state annual report deadlines. States such as California, Delaware, and New York impose penalty fees for late annual report filings. Repeated failures can result in administrative dissolution, which terminates limited liability protection.
9 Using the cash method improperly for inventory-based businesses. Businesses required to use the accrual method that instead use the cash method may face income restatements and interest on underpaid taxes when examined by IRS.

Section 09

Hanmi CPA Insight

Practitioner's Note

Running a business requires more than generating revenue — it requires disciplined, year-round compliance. Many small business owners underestimate the complexity of payroll management, multi-state sales tax obligations, and owner basis tracking, leading to preventable penalties that often far exceed the cost of proper setup.

The 2026 tax year brings meaningful changes under the One Big Beautiful Bill Act: 100% bonus depreciation restores significant first-year deduction opportunities for businesses investing in equipment, and the increased 1099-NEC threshold reduces administrative burden for businesses working with independent contractors. Both changes should be incorporated into year-end planning before December 31.

Establishing strong bookkeeping systems, maintaining proper documentation, and proactively reviewing owner compensation structures each year are the most reliable ways to reduce audit risk and build long-term tax efficiency.