Tax compliance is one of the most important — and most stressful — aspects of running a business. The penalties for getting it wrong range from interest charges on late payments to criminal prosecution for willful evasion. Understanding your tax obligations and staying current isn't optional. It's foundational to running a legitimate business.
Income Tax
Most businesses pay income tax on their profits. The structure depends on how your business is organized. Sole proprietors report business income on their personal tax return using Schedule C. Partnerships and S corporations pass through profits to owners, who report them on personal returns. C corporations pay corporate income tax separately from their owners.
Business deductions reduce taxable income. The rules around what expenses are deductible — and when — are complex. Ordinary and necessary business expenses are generally deductible, but capital expenditures must be depreciated over time, and some expenses face specific limitations. Maintaining good records is essential for claiming deductions and defending them if audited.
Payroll Tax
If you have employees, you owe payroll taxes. The employer portion includes Social Security and Medicare taxes, federal and state unemployment taxes, and sometimes additional state-level taxes. The employee portion — withheld from wages — includes Social Security, Medicare, and federal income tax withholding.
Failing to withhold and remit payroll taxes is one of the most serious tax mistakes a business can make. The trust fund penalty can hold business owners personally liable for withheld taxes that weren't remitted. This penalty applies even if the business doesn't have the funds — it can follow owners personally and last indefinitely.
Sales Tax
If you sell taxable goods or services, you need to collect sales tax from customers and remit it to the state. The rules vary significantly by state and by the type of product or service. SaaS businesses face particularly complex decisions about whether their products are taxable.
Register for a sales tax permit before you start collecting. Collect the correct rate for each customer's location, maintain records of taxable and tax-exempt sales, and file returns on schedule. Many states require monthly or quarterly filing even if you owe no tax — missing a zero-return filing can trigger penalties.
Record-Keeping
The IRS generally requires keeping records for three to seven years depending on the situation. State requirements may be longer. Good records make tax preparation easier, help you manage your business, and provide documentation if you're audited. Digital records are acceptable as long as they can be produced when needed.
At minimum, keep copies of all tax returns filed, supporting documentation for income and deductions, bank statements and canceled checks, employment tax records, and records of asset purchases and depreciation.