S Corp taxes for dummies: A beginner’s guide to filing

Business taxes can feel overwhelming, especially when every structure has its own rules. This guide to S Corp taxes for dummies cuts through the jargon.

If you’ve recently formed an S Corp, or you’re considering one, then you need to understand how its taxes work. The structure offers real advantages. However, they only pay off if you follow the rules.

In fact, you’d be in good company. The S Corporation Association calls the S Corp the most popular corporate structure in America. It cites IRS estimates of more than 5 million S Corps in the U.S., three times the number of C Corps.

This beginner’s guide walks through S Corp tax filing step by step, so you can file with confidence.

What is an S Corp and how is it taxed?

An S Corp is a corporation or LLC that has elected a special tax status with the IRS. Small and midsize companies usually choose it because of pass-through taxation.

Pass-through means profits and losses skip the corporate tax level. Instead, they flow straight to the shareholders instead. As a result, it avoids the double taxation C Corps face.

At the business level, the S Corp files an informational return and usually pays no federal income tax.

Meanwhile, at the owner level, each shareholder reports their share of profit or loss on their personal tax return. It’s then taxed at individual rates.

For beginners, the key point is this: an owner who works in the business can take part of their income as a distribution, not just a salary.

Should you file for S Corp status?

Electing S Corp status is mainly a way to cut self-employment tax on business profits.

Many advisers use a rough rule of thumb. In short, the savings tend to outweigh the extra costs once net profit reaches about $60,000 to $80,000 a year.

Here’s why. Owner-employees first split income between a salary, which carries payroll taxes, and distributions, which don’t. They also keep the liability protection of an LLC or corporation.

However, the trade-off is more admin. For example, you need a payroll system, and you must follow IRS rules on reasonable compensation.

How to file your taxes as an S Corp

S Corp tax filing has two sides: one for the business and one for the owners. Pass-through taxation then links them.

Here is the step-by-step process for S Corp taxes for dummies.

1. File the business tax return (Form 1120-S)

The S Corp files Form 1120-S, an informational return. It reports the year’s total income, deductions, and profit, so the IRS sees the full picture.

However, the business itself typically owes no federal corporate income tax. Calendar-year S Corps can request a six-month extension to September 15.

Still, that extension doesn’t move the shareholders’ own payment deadlines. Any tax they owe on their share of profit is still due on the normal individual schedule.

2. Prepare shareholder reports (Schedule K-1)

After filing Form 1120-S, prepare a Schedule K-1 for every shareholder.

The K-1 shows each owner’s share of the business’s income, losses, deductions, and credits.

Each shareholder then needs their copy to file their own federal return.

3. File each shareholder’s personal return (Form 1040)

Shareholders use their K-1 to report their share of S Corp income on Schedule E (Supplemental Income and Loss).

Schedule E is then attached to their main federal return, Form 1040 (U.S. Individual Income Tax Return).

As a result, S Corp income is taxed at each shareholder’s personal income tax rate.

4. Meet payroll and employment tax requirements

In an S Corp, owners who work in the business are also employees. Therefore, that brings payroll tax duties:

• Form W-2: Reports the owner’s salary. It’s issued to each owner-employee every year.
• Form 941: Reports quarterly payroll taxes, covering Social Security, Medicare, and withheld income tax.
• Form 940: Reports annual federal unemployment tax under the Federal Unemployment Tax Act (FUTA).

The owner’s salary must count as reasonable compensation. A salary set too low can draw IRS attention in an audit.

Is there a deadline for filing S Corp taxes?

Yes, and it comes earlier than the individual deadline. So here are the key dates.

1. Business tax return deadline (Form 1120-S)

Form 1120-S is due on the 15th day of the third month after the tax year ends.

For most S Corps, which run on a calendar year, that means March 15. If March 15 falls on a weekend or holiday, the deadline moves to the next business day.

By that date, the S Corp must file Form 1120-S and send every shareholder their Schedule K-1.

2. Filing an extension

If you need six more months, file IRS Form 7004 by the original March 15 deadline. The new deadline becomes September 15.

However, remember that an extension to file is not an extension to pay. It only buys time for paperwork, not for payment. S Corps rarely owe federal income tax directly, but any tax due still has to be paid on time.

3. Shareholders’ personal deadline

Shareholders report their K-1 figures on Form 1040 via Schedule E. The standard deadline is April 15.

That’s why the S Corp deadline comes a month earlier, because shareholders need their K-1s in time to file their own returns.

The primary tax advantage of an S Corp

The biggest tax benefit of an S Corp is lower self-employment tax for its owners.

In a sole proprietorship or a default LLC, all profit is subject to self-employment tax. An S Corp splits that income into a reasonable salary and distributions. Only the salary carries Social Security and Medicare taxes.

As a result, that split lets small business owners trim their payroll tax bill while still enjoying pass-through taxation.

The S Corp also avoids the double taxation that hits traditional C Corps, where profits are taxed once at the company and again as dividends.