Quarterly Taxes Explained: Deadlines, Estimated Payments, and Common FAQs for New Business Owners

Starting a business changes the way you handle taxes. If you move from being an employee to being self-employed, launching an LLC, or earning income from a side business, you may need to make estimated tax payments throughout the year instead of waiting until tax filing season.

For many founders, quarterly taxes are one of the first administrative surprises after forming a business. The good news is that the system is manageable once you understand the basics: who needs to pay, when payments are due, how much to set aside, and how to avoid common mistakes.

This guide breaks down the essentials in plain language so you can stay organized, reduce stress, and keep your business compliant.

What Are Quarterly Taxes?

Quarterly taxes are estimated tax payments made in advance during the year. They are designed for income that is not subject to automatic withholding, such as:

• Self-employment income
• Freelance income
• LLC profits that pass through to the owner
• Independent contractor income
• Business income from a side hustle

If you are an employee, your employer typically withholds federal income tax, Social Security, and Medicare taxes from each paycheck. If you are self-employed, you are responsible for paying those amounts yourself through estimated tax payments.

The term “quarterly taxes” is common, but the IRS generally refers to these as estimated tax payments.

Who Usually Needs to Make Estimated Tax Payments?

You may need to make estimated tax payments if you expect to owe a meaningful amount of tax when you file your return. Common examples include:

• Sole proprietors
• Single-member LLC owners
• Partners in a partnership
• S corporation shareholders in some situations
• Independent contractors and freelancers
• Business owners with income that is not fully covered by withholding

A business does not always pay taxes at the entity level. In many small-business structures, income passes through to the owner’s personal return. That means the owner may need to pay estimated taxes during the year even if the business itself is not making separate corporate tax payments.

When Are Quarterly Tax Payments Due?

Estimated tax payments are generally due four times per year. The standard due dates are:

• April 15
• June 15
• September 15
• January 15 of the following year

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

A key point for new business owners is that the April payment is not just a filing deadline. It is also often the first estimated tax deadline for the current tax year. In other words, you may need to file your individual return and make an estimated payment around the same time, depending on your situation.

Because deadlines can shift, always confirm the current year’s schedule with the IRS before submitting payment.

How Do Estimated Taxes Work?

Estimated taxes are based on what you expect to owe for the year. That estimate usually includes:

• Federal income tax
• Self-employment tax, if applicable
• State income tax, if your state has one
• Additional taxes that apply to your situation

The goal is not to calculate your final tax bill perfectly on the first try. The goal is to pay enough during the year to reduce the chance of a large balance due or underpayment penalty when you file.

Many business owners review income and expenses each quarter, then adjust their estimated payments if business performance changes.

Do Single-Member LLCs Pay Quarterly Taxes?

A single-member LLC is usually treated as a pass-through entity for tax purposes unless it elects a different classification. That means the LLC itself typically does not pay federal income tax as a separate entity.

Instead, the owner reports business income and expenses on their personal tax return, often using Schedule C. If the business produces profit, the owner may need to make estimated tax payments throughout the year.

This is one of the most important tax concepts for new founders: forming an LLC does not eliminate tax obligations. It changes the legal structure and can help with liability planning, but it does not remove the need to plan for taxes on business earnings.

How Much Should You Set Aside for Taxes?

There is no single percentage that works for every business, but many self-employed owners try to reserve a portion of each payment they receive so they are not caught off guard later.

A common rule of thumb is to set aside about 25% to 30% of income for taxes. That range can be helpful as a starting point, especially when you are early in the business and do not yet know your exact tax profile.

Your actual tax rate depends on several factors, including:

• Total income
• Business expenses
• State tax laws
• Filing status
• Whether you have other income
• Whether self-employment tax applies

If you underpay, you may face penalties or owe a large amount when you file. If you overpay, you may get a refund later, but your cash flow could be tighter during the year.

A practical approach is to keep a separate tax savings account and transfer money into it as revenue comes in.

What If You Only Have a Side Business?

A side business still matters for tax purposes. Even if you earn income outside your regular job, you generally must report it.

If you have a side hustle, estimated taxes may still apply depending on how much you expect to owe after considering withholding from your day job and any credits. For some people, W-2 withholding from employment is enough to cover most or all of the tax due. For others, side-business income creates a tax gap that must be filled with estimated payments.

It is also smart to treat a side business like a real business from the start. That means keeping records, tracking expenses, and separating business and personal finances as much as possible.

How Do You Know Whether You Owe Estimated Taxes?

The IRS generally expects estimated tax payments if both of the following are true:

• You expect to owe tax on income that is not subject to withholding.
• You expect the amount owed to be above the filing threshold for estimated payments.

Many new owners use a simple workflow each quarter:

1. Review year-to-date income.
2. Subtract ordinary and necessary business expenses.
3. Estimate federal and state taxes on the remaining profit.
4. Compare the result with any withholding from a W-2 job.
5. Pay the estimated balance by the deadline.

This process is not glamorous, but it is effective. The more consistently you review your numbers, the easier it becomes to avoid unpleasant surprises.

Can You File and Pay Estimated Taxes Yourself?

Yes. Many business owners handle their own estimated payments, especially in the early stages of a business.

You can usually pay electronically through IRS-approved systems, and you can file your annual return using tax software or by working with a tax professional.

That said, business taxes are often more complicated than employee taxes. You may have deductible expenses, home office deductions, mileage, payroll obligations, sales tax, or state-level requirements to manage. If you are spending too much time trying to interpret tax rules, it may be more efficient to work with a qualified accountant or tax advisor.

A good tax professional can help you:

• Estimate quarterly payments more accurately
• Identify deductible business expenses
• Reduce the risk of penalties
• Improve recordkeeping habits
• Prepare for year-end filing

Common Mistakes to Avoid

New business owners often make the same tax mistakes. Avoiding them can save time, money, and stress.

1. Waiting Until Tax Season

Quarterly taxes are designed to spread payments out during the year. If you wait until April to think about them, you may face a large bill all at once.

2. Mixing Business and Personal Funds

When your business and personal transactions are mixed together, it becomes harder to calculate profit accurately and easier to miss deductions.

3. Forgetting State Taxes

Federal taxes are only part of the picture. Depending on where your business is located and where you earn income, you may also need to plan for state or local taxes.

4. Setting Aside Too Little Cash

Revenue is not the same as profit. If you spend all incoming cash before reserving tax money, you may not have enough left when payment is due.

5. Ignoring Income Changes

If your business grows quickly or slows down, your estimated tax amount may need to change. Revisit the numbers each quarter rather than relying on a stale estimate.

A Simple Quarterly Tax Workflow

If you want a repeatable system, use this checklist every quarter:

• Update income and expense records
• Recalculate business profit
• Estimate self-employment and income tax
• Review withholding from any other job
• Transfer the tax amount into savings
• Submit the estimated payment before the deadline
• Save confirmation records for your files

That routine does not take long once you build it into your monthly or quarterly finance process.

Why Good Tax Habits Matter for Founders

Taxes are not just a compliance task. They are part of building a stable business.

Good tax habits help you:

• Protect cash flow
• Reduce year-end stress
• Avoid penalties and interest
• Keep financial records cleaner
• Make more informed decisions about pricing and spending

For founders forming an LLC or launching a new venture, these habits are especially important in the first year. The earlier you set up a tax process, the easier it becomes to scale responsibly.

Final Thoughts

Quarterly taxes are a normal part of owning a business or earning self-employment income. Once you understand the deadlines, estimate your income correctly, and set money aside throughout the year, the process becomes much more manageable.

If you are starting a business, use the early months to build a tax system that fits your operation. Track income carefully, save consistently, and review your numbers each quarter. That discipline will make tax season simpler and help you stay focused on growing the business.

Zenind supports entrepreneurs at the formation stage and beyond, helping founders build a stronger foundation for compliance and business operations.