How Much to Set Aside for Quarterly Estimated Taxes

Quarterly estimated taxes are one of the biggest stress points for small business owners. You work hard, money comes in, and somehow taxes always feel like a surprise. Learning how much to set aside for quarterlies helps you protect your cash flow, avoid penalties, and finally feel confident about your numbers. In this guide, you’ll learn a simple percentage formula you can use every month, based on your profit and your state, so quarterly estimated taxes stop feeling scary and start feeling manageable. Unfortunately, many business owners never learn this because taxes feel confusing, overwhelming, or like something they can put off until later.

Why Most Small Business Owners Struggle With Quarterly Estimated Taxes

Quarterly estimated taxes aren’t hard because business owners are bad with money. They’re hard because no one explains them clearly.

Here are the most common reasons people don’t learn how to handle quarterlies, or struggle to make real progress:

• They don’t know how much to save

• They don’t understand the difference between revenue and profit

• They forget about state taxes or don’t know they apply

• They don’t save consistently throughout the year

• They assume their accountant will “fix it later”

When you combine all of this, taxes feel random and stressful. One quarter you owe nothing. The next quarter you owe a lot. It feels like guessing instead of planning.

Here’s the hopeful part: you don’t need complicated math, fancy software, or a finance degree. You just need a clear process. In the next steps, I’ll show you exactly how to build one that works.

Start With Profit (Not Revenue)

This step matters because quarterly estimated taxes are based on profit, not the total money coming into your business.

This is the biggest misunderstanding we see with small business owners. They look at their bank deposits and assume that number equals taxable income. It doesn’t.

What Profit Really Means

Profit is what’s left after business expenses.

Profit = Income – Business Expenses

Business expenses may include:

• Software subscriptions

• Office rent or home office costs

• Supplies and equipment

• Contractors and freelancers

• Mileage and travel

• Marketing and advertising

If you don’t subtract these first, you’ll overestimate your taxes and feel broke—even when your business is doing well.

Quick Example

Let’s say for one month:

• You earn $12,000

• You spend $5,000 on business expenses

Your profit is $7,000.

Quarterly estimated taxes are calculated using the $7,000, not the $12,000.

Why Revenue-Based Saving Fails

Saving taxes based on revenue usually causes one of two problems:

1. You save too much and feel cash-poor

2. You stop saving altogether because it feels painful

Neither option helps you build a healthy business.

A Short Story

One small business owner we worked with saved 35% of revenue “just to be safe.” Her business was profitable, but she always felt stressed. Once she switched to saving based on profit, she realized she’d been over-saving by thousands of dollars a year.

The reward: more breathing room and clearer decisions.

Use a Simple Percentage Formula (Instead of Guessing)

This step is where most people get stuck, because they hear too many different answers.

You might hear advice like:

• “Save 30% no matter what.”

• “Just save half and you’ll be fine.”

• “It depends—talk to your CPA.”

While those answers aren’t wrong, they’re not helpful unless you understand why.

The Simple Percentage Formula

For most small business owners, a safe starting range looks like this:

• Federal taxes: 20–25% of profit
• State taxes: 3–8% of profit (varies by state)
  
  Total recommended range: 25–35% of profit

This covers:

• Federal income tax

• Self-employment tax

• State income tax (if applicable)

Why a Range Is Better Than One Number

Taxes aren’t one-size-fits-all. Your percentage depends on:

• Your income level

• Your business structure

• Your state

• Your deductions

That’s why a range works better than a single “magic number.”

Quarterly Estimated Taxes by State (Simplified)

State taxes are often forgotten, and that’s where many surprises come from. Below is a simplified way to think about them.

States With No Income Tax

If you live in states like:

• Texas

• Florida

• Tennessee

• Nevada

• Washington

You may only need to save 25–28% of profit.

States With Moderate Income Tax

States like:

• North Carolina

• Colorado

• Arizona

A good range is 28–32% of profit.

States With Higher Income Tax

States like:

• California

• New York

• New Jersey

You may want to save 32–35% of profit.

These are general guidelines. A CPA can fine-tune this for your exact situation.

The Biggest Mistake in Using a Simple % Formula (And How to Avoid It)

The biggest mistake isn’t choosing the wrong percentage.

It’s not separating tax money.

What Happens When You Don’t Separate It

• You accidentally spend it

• You forget what’s saved and what’s available

• You feel anxious every quarter

What to Do Instead

• Open a separate tax savings account

• Transfer your tax percentage monthly

• Treat that money as untouchable

This one habit changes everything.

Make It Monthly So Quarterlies Feel Easy

This is the light at the end of the tunnel. When you do this step, quarterly estimated taxes stop feeling heavy.

The goal of the previous steps are simple:

Turn taxes into a routine, not a surprise.

What This System Gives You

When you:

• Track profit monthly

• Apply a clear percentage

• Move money consistently

You unlock:

• Predictable cash flow

• Calm tax deadlines

• Better planning

• Confidence as a business owner

Your Monthly Tax Routine

Here’s your simple monthly process:

1. Look at last month’s profit

2. Multiply it by your tax percentage

3. Transfer that amount to your tax account

That’s it.

Example

Monthly profit: $8,000
Tax percentage: 30%

$8,000 × 30% = $2,400

Transfer $2,400 to your tax savings.

When quarterly deadlines arrive, the money is already there.

What the IRS Requires

The IRS uses a pay-as-you-go tax system, which means taxes are expected to be paid throughout the year as income is earned, not just when you file your tax return.

If you don’t have enough taxes withheld from a paycheck (or you don’t have a paycheck at all), the IRS generally requires you to make quarterly estimated tax payments.

You’re typically required to pay quarterly estimates if:

• You are self-employed or a business owner, and you make a profit

• You earn income that does not have taxes withheld, such as:

• Business income

• Rental income

• Investment income

• K-1 income from partnerships or S corporations

• You expect to owe $1,000 or more in federal tax when you file your return

How Quarterly Estimates Are Calculated

Quarterly estimated payments are based on your expected total tax for the year, which includes:

• Income tax

• Self-employment tax (if applicable)

In simple terms, the IRS expects you to prepay your tax bill in four roughly equal payments throughout the year.

Most taxpayers calculate estimates using one of these methods:

• Prior year safe harbor: Paying in at least 100% of last year’s total tax (110% for higher-income taxpayers)

• Current year estimate: Paying based on what you expect to earn this year

As long as you meet one of the IRS “safe harbor” rules, you generally avoid underpayment penalties — even if your actual tax bill ends up being higher.

Quarterly Estimated Tax Deadlines (Save This)

Here are the standard deadlines:

• April 15

• June 15

• September 15

• January 15 (for the prior year)

When you save monthly, these dates stop feeling urgent.

Common Questions Small Business Owners Ask

What If My Income Is Inconsistent?

Use monthly profit averages. Some months you save more, some less. It balances out over time.  But make sure you are meeting the IRS prior year safe harbor amounts.

What If I Over-Save?

Over-saving isn’t a failure. It usually turns into:

• A refund

• A credit for next year

What If I Under-Save?

This is why ranges and buffers matter. Adjust your percentage as income grows.

Bonus Tips to Make Quarterlies Even Easier

Tip 1: Review Your Percentage Once a Year

As your business grows, your tax picture changes. Revisit it annually.

Tip 2: Use Automations If Helpful

Automatic transfers can remove emotion from saving.

Tip 3: Don’t Ignore State and Local Taxes

They add up faster than you think.

Tip 4: Get Support When Needed

This guide gives you clarity. A CPA gives you precision.

Final Thoughts

Quarterly estimated taxes don’t have to feel confusing, stressful, or heavy. When you base your savings on profit, apply a clear percentage, and move money monthly, taxes become just another system in your business—not a constant worry.

If you want help dialing in the right percentage for your business, your state, and your goals, we’re here to help. Book a meeting with our team to create a quarterly tax strategy that fits your business and gives you confidence year-round.

Save this guide. Share it. Revisit it each quarter.
Your future self (and your bank account) will thank you.