How Much Should Freelancers Set Aside for Taxes? (Here's the Real Math)

Ask ten freelancers how much they set aside for taxes and you'll get ten different answers — and probably nine of them are wrong. Not because freelancers are careless, but because the tax situation for self-employed people is genuinely more complicated than it is for salaried workers, and almost nobody walks you through the actual calculation.

The consequences of getting this wrong range from annoying to serious. At the mild end: a surprise tax bill you have to scramble to pay. At the worse end: underpayment penalties on top of that bill, or a spiral of putting the tax money toward living expenses and then being unable to pay it back when the bill arrives.

This article is about the real math: what you're actually taxed on as a freelancer, what the rates are, how to calculate an honest quarterly set-aside, and how to handle the part that makes freelance taxes uniquely complicated — the income that doesn't arrive smoothly.

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Why freelance taxes are different from salaried taxes

When you work as an employee, your employer handles two things you don't see: they withhold income tax from every paycheck and send it to the government on your behalf, and they pay half of your Social Security and Medicare taxes (together called FICA) out of their own pocket.

When you freelance, both of those things change. Nobody withholds income tax for you — you're responsible for setting it aside yourself and paying it quarterly. And because you're both the employer and the employee, you pay both halves of FICA. This is called self-employment tax, and it's the number that most catches first-time freelancers off guard.

The self-employment tax rate is 15.3% on net self-employment income up to the Social Security wage base (which changes annually — in recent years it's been in the $160,000–$170,000 range). Above that threshold, the rate drops to 2.9% (Medicare only). This is on top of income tax, not instead of it.

There is a partial deduction: you can deduct half of the self-employment tax you pay from your taxable income when calculating income tax. It doesn't eliminate the self-employment tax, but it reduces its effective bite.

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The actual formula

Here's the calculation, step by step. We'll use a concrete example throughout.

Say you expect to earn $80,000 in freelance income this year and have $15,000 in legitimate business expenses (software, equipment, a portion of your home office, professional services, and so on).

Step 1: Calculate net self-employment income

Net SE income = Gross freelance revenue − Business expenses $80,000 − $15,000 = $65,000

Step 2: Calculate the self-employment tax deduction

You can deduct 50% of your self-employment tax when calculating SE tax itself. The IRS provides a multiplier for this: multiply net SE income by 0.9235 to get the figure that SE tax applies to.

$65,000 × 0.9235 = $60,027.50

Step 3: Calculate self-employment tax

Multiply by 15.3% (assuming you're below the wage base):

$60,027.50 × 0.153 = $9,184.21

Step 4: Calculate the SE tax deduction for income tax purposes

Half of the SE tax reduces your taxable income:

$9,184.21 ÷ 2 = $4,592.11

Step 5: Calculate taxable income for federal income tax

Start with net SE income, subtract the SE tax deduction:

$65,000 − $4,592.11 = $60,407.89

Then subtract the standard deduction (for 2024, it's $14,600 for single filers, $29,200 for married filing jointly). Using single filer:

$60,407.89 − $14,600 = $45,807.89

Step 6: Calculate federal income tax

Apply 2024 tax brackets to $45,807.89:

• 10% on the first $11,600: $1,160
• 12% on $11,601–$47,150, so on $34,207.89: $4,104.95

Total federal income tax: approximately $5,265

Step 7: Add state income tax

State rates vary from 0% (Texas, Florida, Nevada, and a few others) to over 13% (California top rate). For this example, assume a 5% flat state income tax on taxable income:

$45,807.89 × 0.05 = $2,290.39

Step 8: Total tax liability

Self-employment tax: $9,184.21 Federal income tax: $5,265.00 State income tax: $2,290.39 Total: $16,739.60

On $65,000 net income, that's an effective rate of approximately 25.8%.

Step 9: Quarterly set-aside

Divide annual liability by 4 for quarterly payments: $16,739.60 ÷ 4 = $4,184.90 per quarter

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Why the "set aside 25-30%" rule is roughly right — but not precise enough

You'll often see freelancers told to "just set aside 25-30% of everything you earn." As a rule of thumb, this is defensible: it's in the right ballpark for most US-based freelancers in middle income brackets without significant deductions. But it's imprecise in ways that matter.

It's too high for lower earners. If your net SE income is $25,000, your effective total tax rate is probably closer to 15–18%, not 30%. Setting aside 30% is unnecessarily conservative and creates a cash flow problem.

It's too low for higher earners in high-tax states. If you're earning $150,000 net in California, your combined federal, state, and SE tax burden can approach 40–45% of net income. A 30% set-aside leaves you with a significant shortfall.

It doesn't account for deductions. Every legitimate business expense reduces your taxable income, which reduces both income tax and (because it reduces net SE income) your self-employment tax. Freelancers who don't track their deductions carefully are almost certainly overpaying.

The more accurate approach is to run the actual calculation each quarter based on your year-to-date income, your projected annual income, and your actual deductions so far. This is more work, but it gives you a number you can rely on rather than a rule of thumb you're hoping is close enough.

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The quarterly payment schedule

The IRS expects freelancers and self-employed people to pay taxes throughout the year rather than all at once in April. If you don't, you may owe underpayment penalties even if you pay everything you owe by the April deadline.

The quarterly deadlines are:

• April 15 — for income earned January 1 through March 31
• June 15 — for income earned April 1 through May 31
• September 15 — for income earned June 1 through August 31
• January 15 of the following year — for income earned September 1 through December 31

Note the oddly compressed second quarter: it covers only two months, not three. Missing this nuance is a common mistake.

To avoid underpayment penalties, you generally need to pay either 90% of what you'll owe this year or 100% of what you owed last year (110% if your prior-year income was over $150,000). The "100% of last year's tax" option is called the safe harbor rule, and it's useful if your income is unpredictable — you pay based on a known figure rather than trying to forecast an uncertain one.

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The income timing problem

The thing that makes freelance tax planning genuinely complicated isn't the math — it's the variability.

Salaried workers receive consistent paychecks on a predictable schedule. Tax withholding happens proportionally and automatically. Freelancers receive lumpy, unpredictable income: large project payments followed by slow months, late invoices, retainer clients alongside one-off jobs. The quarterly tax system assumes you can estimate your annual income with reasonable accuracy, but freelancers often can't.

There are a few practical approaches to handling this.

The simplest is to set aside a fixed percentage of every payment immediately when it arrives — before it gets mixed in with your operating funds. This percentage should be the high end of your estimated rate (25-30% for most earners) rather than the low end. If you've been setting aside too much, you get a refund. If you've been setting aside too little, the under-withholding is at least partially covered.

A more precise approach is to maintain a separate tax account — a dedicated savings account where your tax set-asides sit — and run the calculation each quarter using your actual year-to-date figures rather than annual projections. This requires knowing your numbers, but it means your quarterly payment reflects reality rather than a rough estimate.

The most accurate approach combines your actual transaction data with a tool that can query it. If you've uploaded your bank and payment platform CSVs to a tool like Cashowa, you can ask "what was my freelance net income for Q1?" and get a real answer based on actual transactions — not a mental estimate. From there, running the tax calculation is straightforward. Cashowa can do this calculation directly: it pulls the right figures from your uploaded data and gives you an honest answer with the arithmetic shown, rather than a rule-of-thumb percentage that may or may not apply to your situation.

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The deductions most freelancers leave on the table

Business deductions reduce both your income tax and your self-employment tax — which means they're worth more to a freelancer than to a salaried employee claiming the same deduction.

The home office deduction is the most commonly missed. If you have a dedicated workspace in your home used regularly and exclusively for business, you can deduct either the actual expenses (a proportion of rent or mortgage interest, utilities, and internet) or the simplified method ($5 per square foot, up to 300 square feet). This alone can be worth $1,000–$2,000 per year for most home-based freelancers.

Equipment and software are deductible in the year of purchase under Section 179 in most cases. Your laptop, your design software subscription, your project management tools, your accounting software — if they're used for business, they're deductible.

Professional development — courses, books, conferences, memberships in professional organisations — are deductible when they relate to your field.

Health insurance premiums are deductible above the line (directly from gross income) for self-employed people who aren't eligible for employer-subsidised coverage through a spouse's plan. This is a significant deduction that many freelancers don't claim.

The self-employed retirement deduction is perhaps the most underused. Contributions to a SEP-IRA (Simplified Employee Pension) can be up to 25% of net SE income, up to a very high annual maximum. Every dollar contributed reduces your taxable income dollar for dollar — and it's building your retirement simultaneously.

Each of these deductions changes the calculation meaningfully. Which is why "set aside 25-30%" is an imprecise answer: it doesn't know about your home office, your equipment purchases, or your SEP-IRA contributions. Your actual number does.

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Frequently asked questions

Do I need to pay quarterly taxes if this is my first year freelancing?

Technically, the IRS doesn't penalise you for underpayment in your first year of self-employment in some circumstances, but the safe approach is to start paying quarterly from year one. The practical reason: it's much easier to build the habit of setting aside tax money from the beginning than to scramble to pay a large bill after your first year. Pay quarterly, even if your initial estimates are rough.

What if I can't afford to pay my quarterly taxes?

Pay as much as you can and file on time anyway. The penalty for underpayment is much less severe than the penalty for non-filing. If you genuinely can't pay, the IRS has payment plan options — but the first step is always to file on time.

Does income from platforms like Upwork, Fiverr, or Toptal count as freelance income?

Yes. Regardless of the platform, income you receive for services is self-employment income subject to both income tax and self-employment tax. You should receive a 1099-NEC from platforms that paid you over $600 in a year, but you're required to report income even if you don't receive a form.

If I have a mix of freelance and salaried income, how does this change things?

Only your freelance income is subject to self-employment tax. However, your total income — salaried plus freelance — determines your income tax bracket, which affects the rate at which your freelance income is taxed. Your employer's withholding covers your income tax on your salary, but not the SE tax or income tax on your freelance earnings. You'll likely need to make quarterly payments for the freelance portion.

Can I deduct a portion of my car if I use it for business?

Yes, using either the actual expense method (tracking real fuel, maintenance, and insurance costs proportional to business use) or the standard mileage rate (which changes annually and is currently around $0.67 per mile for 2024). The standard mileage rate is simpler; the actual expense method sometimes yields a larger deduction for high-mileage drivers. Keep a log of business trips either way.

What's the safest way to handle taxes if my income varies wildly month to month?

Use the safe harbor rule: calculate what you paid in total taxes last year and pay at least that much this year (or 110% of it if your prior-year income exceeded $150,000). This protects you from underpayment penalties regardless of what your income actually turns out to be. Then reconcile everything at year end and pay any additional amount owed by April 15.