The Monet Blog · Taxes

Small-business tax basics: entity choice, payroll, and the records that protect you

Sole proprietor, LLC, S corporation — what actually changes, and why bookkeeping quality decides how much of any strategy survives an audit.

By Sankha NagChoudhurySeptember 11, 20269 min read

Entity choice gets most of the attention, but the returns on clean books, correct payroll, and documented business purpose are usually larger and far more durable.

Entity choice changes taxation, not legitimacy of expenses

A legitimate business expense is deductible whether you are a sole proprietor or an S corporation. What changes across entities is self-employment tax treatment, payroll obligations, filing complexity, and liability protection.

An LLC is a legal structure; its default tax treatment depends on ownership and elections.
An S election can reduce self-employment tax on distributions, but requires reasonable W-2 compensation and payroll administration.
Complexity has a real annual cost: payroll service, additional returns, and professional fees.

Reasonable compensation is where S corporations go wrong

Paying yourself an artificially low salary to convert wages into distributions is a well-known examination target. Compensation should be defensible against what the role would cost on the open market.

Document how you arrived at the salary figure: role, hours, market data, and profitability.
Run real payroll with withholding and filings; owner draws are not a substitute.
Revisit the figure as the business grows rather than leaving it fixed for years.

Estimates and cash discipline

Business owners pay tax as income is earned, not once a year. Missing quarterly estimates creates penalties and, more often, a cash crisis in April.

Move a fixed percentage of every deposit into a separate tax account on the day it lands.
Safe-harbor rules can protect against underpayment penalties when income is uneven.
State and local obligations — including sales tax and franchise fees — have their own calendars.

Documentation is the strategy that survives

Deductions are sustained by contemporaneous records and a clear business purpose. Reconstructed spreadsheets built after a notice arrives rarely hold up.

Separate business and personal accounts completely; commingling weakens every other position.
Keep mileage logs, receipts above documentation thresholds, and written agreements with related parties.
Close the books monthly. Annual cleanup is where errors and missed deductions live.

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Small-business tax basics: entity choice, payroll, and the records that protect you

Entity choice changes taxation, not legitimacy of expenses

Reasonable compensation is where S corporations go wrong

Estimates and cash discipline

Documentation is the strategy that survives

Ask Monet this

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