Understanding Your Quarterly Estimated Tax Payments

What Are Estimated Tax Payments?

The U.S. tax system is built on a pay-as-you-go model. For employees, this is handled automatically through paycheck withholding. Your employer deducts federal and state taxes from every paycheck and sends them to the IRS on your behalf throughout the year.

Business owners do not have an employer doing that for them. If you own a business, receive rental income, or earn self-employment income, no one is withholding taxes from that money as it comes in. The IRS still expects tax payments throughout the year, so it requires you to make estimated tax payments on a quarterly schedule.

These payments are not a penalty or an extra tax. They are simply an advance payment toward the tax bill you will owe when you file your return in April.

Why Do You Have to Pay Quarterly?

If you were to wait until April to pay your entire tax bill, the IRS would charge an underpayment penalty. This penalty is not based on whether you owe money at filing time. It is charged because you did not pay enough tax throughout the year as income was earned.

Quarterly payments spread your liability across four installments, keep you in good standing with the IRS, and eliminate large, unexpected balances at tax time.

When Are Estimated Tax Payments Due?

There are four payment deadlines each year. Note that the schedule does not follow equal three-month intervals:

Quarter	Income Period	Due Date
Q1	January 1 to March 31	April 15
Q2	April 1 to May 31	June 15
Q3	June 1 to August 31	September 15
Q4	September 1 to December 31	January 15 (following year)

If a due date falls on a weekend or federal holiday, the deadline moves to the next business day.

How Is Your Estimated Payment Calculated?

Your advisor uses your year-to-date financial information to project what your total annual tax liability is likely to be. The general process looks like this:

• Start with your year-to-date income across all sources: business net income, W-2 wages, rental income, and any other taxable amounts.
• Annualize that figure to project what your full-year income is expected to be.
• Apply your current effective tax rate and applicable deductions to estimate your total tax for the year.
• Subtract any tax already paid through payroll withholding or prior quarterly payments.
• Divide the remaining liability into the quarters still ahead.

The goal is not to calculate your exact tax return. The goal is to get close enough that you avoid underpayment penalties and are not caught with a large surprise balance in April.

For S-Corporation Owners
If you own an S-Corporation, there is an important distinction to understand about estimated tax payments.
An S-Corp is a pass-through entity. That means the business itself does not pay federal income tax. Instead, the company's income and expenses flow through to your personal tax return, and you pay tax on your share of that income personally.

Because the tax obligation belongs to you as an individual, your estimated tax payments must be made from your personal bank account. Using business funds to make these payments counts as a distribution and can create complications with your compensation structure and year-end tax position.

Your payment instructions will always specify the federal and state amounts to pay, along with a reminder that these should be made from personal funds.

What About Corporate or Franchise Tax Payments?

Some clients receive a separate corporate-level tax payment in addition to their personal estimated payments. These are not the same thing.

A few common examples:

• California charges an annual franchise tax on S-Corporations and LLCs operating in the state. This is paid at the entity level, meaning it comes out of the business, not your personal account.
• Some states impose their own business-level taxes on pass-through entities regardless of federal treatment.

When a corporate or franchise payment applies to your situation, your advisor will call it out separately in your payment instructions. It will be labeled clearly so you know which amount is personal and which is a business obligation.