Tax season has a way of sneaking up on small business owners, especially when you’re heads-down running day-to-day operations. Missing a deadline or leaving a legitimate deduction on the table can cost you real money — sometimes in penalties, sometimes in taxes you didn’t have to pay. Here’s a practical rundown of what to keep on your radar.
Deadlines Worth Circling on the Calendar
Quarterly estimated taxes. If you’re self-employed or run a pass-through entity, the IRS expects estimated payments four times a year, not just once in April. Missing these can trigger underpayment penalties even if you pay everything owed by the filing deadline.
Entity-specific filing dates. S-corps and partnerships typically file earlier than sole proprietors and C-corps. If your business structure changed this year, double check which deadline applies to you — this is one of the most common scheduling mix-ups we see.
Extensions don’t extend payment. Filing for an extension gives you more time to file your paperwork, but not more time to pay what you owe. A lot of business owners are surprised by this one.
1099 deadlines for contractors. If you paid any contractor $2000 or more during the year, you generally need to get their 1099-NEC out by the end of January. This one is easy to lose track of if you’re not tracking contractor payments throughout the year.
Write-Offs That Get Missed More Than You’d Think
Home office deduction. Many business owners avoid this deduction because they’ve heard it’s an “audit flag.” Used correctly and documented properly, it’s a legitimate deduction — don’t leave it on the table out of fear alone.
Mileage and vehicle expenses. If you’re using your car for business errands, client visits, or supply runs, that mileage adds up. Without a mileage log, though, it’s hard to substantiate — and unsubstantiated deductions are the first thing to go if you’re ever questioned.
Business use of personal phone and internet. If you use your personal phone or home internet for business, the business-use percentage is deductible. This gets missed constantly simply because owners don’t think to track it.
Professional development and education. Courses, certifications, conferences, and even some coaching related to your business can be deductible. Given how many small business owners invest in their own growth, this is one that’s often left unclaimed.
Startup costs.If you started your business this year, certain startup and organizational costs can be deducted or amortized — but only if you know how to claim them.
Retirement contributions. SEP IRAs and solo 401(k)s can meaningfully lower your taxable income while building your own retirement savings. This is one of the most underused tools available to small business owners.
The Real Takeaway
Taxes for a small business aren’t just an annual event — they’re an ongoing part of running the business well. The owners who do best at tax time are the ones who track things consistently throughout the year instead of scrambling in March.
If you want a second set of eyes on your deadlines or a clearer picture of what you may be missing, Empower Bookkeeping is here to help. Reach out at clientcare@empowerbookkeeping.com.
This post is for general informational purposes and isn’t a substitute for individualized tax advice.