This week on Reddit's r/smallbusiness - 2.4 million members, real business owners, no PR spin - a post hit the front page that resonated with a lot of people.

A business owner wrote that his accountant had called and said he would owe $130,000 in taxes. Deadline was the next day. He had known it was coming, had done well that year, and was proud of it. But the reality of having to move that much cash in 24 hours hit him hard.

He wrote: "It'll be fine. I'm proud of how the business did. But damn."

The post got over 500 upvotes and 363 comments. Most of them from people who had been exactly there.

Tax Day happens every April. The hangover - the realization that next year could be just as painful if nothing changes - that starts now. Here is what to actually do about it.

Why Small Business Taxes Catch People Off Guard

When you work for someone else, taxes come out of every paycheck automatically. You never see the money. You never think about it. At the end of the year, you might get a refund.

When you own a business, none of that happens automatically. You get paid, you pay your bills, you invest back in the company - and the tax bill accumulates quietly in the background until April arrives.

Most first- and second-year business owners experience at least one year where the bill is bigger than expected. Often it is because the business did better than they planned. Success can feel like a penalty when you haven't set aside the right amount.

The Quarterly System - and Why It Exists

The IRS expects self-employed people and business owners to pay taxes four times a year, not once. These are called estimated quarterly payments.

The 2026 due dates:

• April 15 - Taxes on January, February, March income (just passed)
• June 16 - Taxes on April, May income
• September 15 - Taxes on June, July, August income
• January 15, 2027 - Taxes on September, October, November income

If you did not pay the April 15 installment or underpaid it, you may owe a small penalty. That is fixable. The bigger issue is whether you have a system for the next three payments.

The Simplest System That Actually Works

The most common advice from accountants to new business owners is also the simplest: set aside a percentage of every payment you receive, immediately, in a separate account.

The question is: what percentage?

A rough starting point for most small business owners:

• If you're a sole proprietor or single-member LLC: Set aside 25% to 30% of every payment you receive
• If your business is an S-Corp and you pay yourself a salary: Your payroll taxes are handled separately, so the percentage for the business is lower - your accountant can give you a specific number

The exact percentage depends on your state taxes, deductions, and income level. But having the money there is more important than having it be exactly right. You can adjust.

The account does not earn much in interest. That is fine. Its only job is to be there when you need it.

Three Things to Do This Week

1. Get your Q1 estimated payment confirmed. If you haven't made your April 15 payment yet or weren't sure you needed to, call your accountant this week - not in June. Penalties for underpayment are based on how long the underpayment sits.

2. Set up the transfer now. If you don't already have a separate tax savings account, open one. Many business banks let you create named sub-accounts in minutes. Call it "taxes." Every time money comes in, move a percentage before you touch the rest.

3. Book a 30-minute call with your accountant before June. Not to do your taxes - just to know what your estimated Q2 payment should be based on how the year is going so far. Accountants are not just for April. The ones worth keeping are the ones you talk to quarterly.

The Reddit Thread Had the Right Ending

That business owner who owed $130,000 got hundreds of comments. Some were advice. But many were just people saying: "I've been there. Good problem to have. Now build the system so next year feels different."

He's right that it's a good problem. A $130,000 tax bill means his business made real money. The goal now is making sure that same money doesn't come as a shock twelve months from now.

The system isn't complicated. Most business owners just never build it until they've been surprised once.

Now you know before you have to find out the hard way.

Source: r/smallbusiness on Reddit - April 2026, 550+ upvotes