No, You Don't Just Deal With Taxes in April — And It's Costing You

Here's a myth that costs general contractors real money every single year: "I only need to worry about taxes in April." It sounds reasonable on the surface. You're busy running jobs, managing crews, and chasing invoices. Taxes feel like a once-a-year problem you hand off to someone in the spring. But that thinking is exactly what leads to surprise bills, penalties, and cash crunches that could have been avoided.

The truth is, if you're running a contracting business with any kind of revenue, the IRS expects you to pay taxes four times a year — not once. These are called quarterly estimated tax payments, and they're due in April, June, September, and January. If you skip them or underpay, you don't just owe the difference in April. You owe interest and penalties on top of it, calculated from the dates those payments were due.

Most contractors find out about this the hard way. They have a decent year, hand their records to a tax preparer in March, and get hit with a bill that's three times what they expected — plus fees they didn't know were coming. That's not bad luck. That's what happens when tax planning only happens once a year.

There's another layer to this that catches people off guard. As a self-employed contractor, you're responsible for both the employee and employer portions of Social Security and Medicare taxes — that's called self-employment tax, and it runs about 15.3% on top of your regular income tax rate. When you work for someone else, your employer quietly covers half of that. When you work for yourself, you cover all of it. Nobody withholds it for you, which means nobody is setting it aside unless you are.

So what does staying on top of this actually look like? It starts with keeping your books clean throughout the year — not just when tax season rolls around. When you know what you're earning and what you're spending in real time, estimating what you'll owe becomes straightforward. You can set aside the right amount each quarter instead of scrambling to find a lump sum in April.

It also means working with someone who's thinking about your tax situation year-round, not just when the deadline is three weeks away. A good bookkeeper and tax advisor working together can look at your numbers in October and tell you whether you're on track or whether you need to adjust before the year closes. That conversation in October is worth a lot more than the same conversation in April when there's nothing left to do.

The contractors who handle taxes well aren't necessarily the ones making the most money. They're the ones who stopped treating taxes as an annual event and started treating them as something that runs in the background all year. That shift doesn't require a big operation or a fancy system. It just requires staying current on your books and checking in with someone who knows what to look for.

And here's something worth saying plainly: this isn't complicated once you have a system. The reason it feels complicated for most contractors is that they're trying to do it all at once, at the worst possible time, with incomplete records. When you have clean books and someone reviewing them regularly, the quarterly stuff becomes routine. You stop dreading it.

If you're a general contractor and tax season still feels like a gut punch every year, that's a sign the system isn't working — not a sign that taxes are just hard. At Blackfin, we work with service business owners to keep their books current and their tax situation visible all year long. If you'd like to talk through where you are and what a better setup might look like, we're happy to have that conversation.