Quarterly Estimated Taxes: A Complete Guide for Self-Employed Business Owners

One of the biggest surprises for new business owners is discovering that taxes aren't automatically withheld from their income. Instead, you're responsible for paying estimated taxes four times a year. Miss them and you'll owe penalties — even if you pay everything by April 15.

You generally need to pay quarterly estimated taxes if:

• You expect to owe at least $1,000 in federal taxes for the year
• Your withholding and credits won't cover at least 90% of your tax liability

This applies to sole proprietors, partners, S-Corp shareholders, and self-employed individuals.

There are two safe harbor methods:

Method 1: 90% of current year tax Pay at least 90% of what you'll owe for the current year, spread across four payments.

Method 2: 100% of prior year tax Pay 100% of last year's total tax liability (110% if your AGI exceeded $150,000). This is the safer method if your income is unpredictable.

Pay online at IRS Direct Pay (irs.gov/payments) or through the Electronic Federal Tax Payment System (EFTPS). You can also mail a check with Form 1040-ES.

The IRS charges an underpayment penalty — currently around 8% annualized. It's not catastrophic, but it's avoidable.

Most states with income tax also require quarterly estimated payments. Texas has no state income tax, so Texas-based business owners only need to worry about federal payments.

Need help calculating your quarterly estimated taxes? The Gap ProAdvisors provides tax planning and preparation services for small businesses nationwide. Contact us.