How Much Should I Set Aside for Taxes if I'm Self-Employed?

At some point in your first year of self-employment, you deposit a client payment, feel briefly rich, spend most of it, and then meet tax season. The bill is larger than you expected. You pay it off over months. You swear it won't happen again. If you need a baseline, start with our budget for your household expenses.

It happens again.

Not because you're bad with money. Because nobody taught you the mechanics of self-employed taxation before you needed them, and the 25-30% rule you found online is missing half the picture.

Here's the complete version.

Why the 25-30% Rule Exists (and Why It's Incomplete)

The rule comes from a reasonable approximation of what most self-employed workers in the US and Canada owe when you combine federal income tax, provincial or state income tax, and self-employment tax (or CPP contributions in Canada). For someone earning $60,000-$80,000 net, 25-30% lands in roughly the right zone.

The problem is it gets applied to the wrong number. Most people hear "set aside 25% for taxes" and interpret it as 25% of their deposits — their gross revenue. If you have significant business expenses, that's too much. If you have minimal expenses, it might be too little. And if your income swings month to month, a flat percentage applied to whatever you just received can leave you short in a good month and over-reserved in a slow one.

What you actually owe taxes on is your net profit: your income after legitimate business expenses. That's the number you should be applying a percentage to.

Step One: Separate Income from Profit

The first calculation is simple but critical. Every time money comes in, it's not all yours. Some of it covers the cost of doing business. Only what's left over is your actual profit — and only your profit gets taxed.

If you invoice $8,000 in a month and you have $1,200 in software, equipment, and professional fees, your taxable income for that month is $6,800, not $8,000. You'd be over-reserving by $200+ if you applied 25% to the full invoice amount rather than your net.

This matters more if you have substantial business overhead. A video editor who spends $500/month on software and gear has a meaningfully lower tax base than their revenue suggests. A consultant with zero overhead is basically taxed on everything they earn.

Step Two: Know Your Effective Rate, Not Your Marginal Rate

Your marginal rate is what you pay on the last dollar you earn — the rate for your top bracket. Your effective rate is your actual tax as a percentage of your total income, after all brackets are applied and deductions are counted. It's almost always lower than your marginal rate.

Most freelancers and self-employed workers in Canada and the US use their marginal rate to set aside taxes and end up over-reserving. That's the safer mistake to make, but it can create a cash flow problem in slow months when you're locking away more than you need to.

Here's a rough guide to effective rates (income tax only, not including self-employment/CPP) for self-employed workers in common income ranges:

These are ballpark figures. Your actual rate depends on your province or state, your filing status, and which deductions you claim. But they're enough to sanity-check whether your current set-aside is in the right ballpark.

One more thing: in the US, add roughly 14-15% for self-employment tax on top of income tax (though you can deduct half of it). In Canada, CPP contributions for self-employed workers run around 11.9% of net earnings up to the maximum (about $73,200 in recent years). These aren't income taxes, but they come due at the same time and catch a lot of people off guard.

The Practical Formula

Here's how to set your reserve rate:

1. Look at last year's tax return (or estimate this year's net income)
2. Find the effective rate from your return, or estimate using the table above
3. Add self-employment tax or CPP contributions as a percentage of your net income
4. That combined percentage is your set-aside rate, applied to net profit (not gross revenue)

If you don't have a prior year to reference, use 27% as your starting rate and adjust after your first annual return. That's conservative enough to protect you without being so aggressive that it hurts your cash flow.

The Separate Account Rule (Non-Negotiable)

Knowing your set-aside rate is useless if the money sits in your operating account. It will get spent. Not out of bad discipline — but because your brain registers the account balance as "money you have," not "money you owe." The $1,800 earmarked for taxes looks identical to the $1,800 available for rent.

Open a separate savings account and name it something concrete: "Tax Reserve" or "CRA/IRS Funds." Every time you receive a payment, transfer your set-aside amount before paying yourself or covering any other expense. Automate this if your bank allows percentage-based transfers.

The moment it hits that account, mentally treat it as gone. It's not your money. It's a bill that comes due once or four times a year.

Quarterly Payments: The Deadline Most Freelancers Miss

Once your tax bill gets large enough, tax authorities don't want to wait until April. They want installments throughout the year.

In the US: If you expect to owe $1,000 or more for the year, the IRS expects quarterly estimated payments. The deadlines are April 15, June 15, September 15, and January 15 of the following year. Miss them and you'll owe a penalty — typically 7-8% annualized on the underpayment, which isn't catastrophic but is money you're paying for no reason.

In Canada: The CRA requires quarterly installments if your net tax owing exceeded $3,000 in the current year and either of the two previous years ($1,800 in Quebec). Installment due dates are March 15, June 15, September 15, and December 15. Same story — missing them means interest charges.

If you're keeping money in a separate tax reserve account, making these payments is just a transfer. The money is already there. That's the point of the system.

What Happens to Your Reserve in a Slow Month

This is where most advice breaks down. If you earn $9,000 in March and $2,800 in July, a flat 27% set-aside rule will take $2,430 in March and $756 in July. But your actual tax bill is based on your annual income, not each month. In a genuinely slow month, you might be over-reserving relative to what your annual bill will require.

The practical answer is: over-reserve slightly all year, then keep the surplus as a buffer. A small positive balance in your tax reserve at the end of the year means a refund or a head start on next year. A negative balance means a surprise bill.

If you want to be precise rather than conservative, calculate your tax set-aside based on your average monthly net profit across the year — not your actual monthly earnings. In a slow month, you're still setting aside as if it were an average month. This smooths out the variability and prevents you from spending money in good months that you'll need later.

The Deductions You're Probably Missing

Most self-employed people claim the obvious deductions — software, equipment, maybe home office. Many miss some of the less obvious ones:

• Professional development: Online courses, books, conferences directly related to your field.
• Bank fees and transaction costs: If you pay Stripe or PayPal fees on client payments, those are deductible.
• Health insurance premiums: In the US, self-employed workers can often deduct premiums paid for themselves and family.
• Business-related travel: If you travel to meet clients, the costs are deductible. Your daily commute to a co-working space you use regularly is more complicated.
• Subscriptions with a business use: If you use a project management tool, design software, or even cloud storage primarily for client work, those are deductible.
• The home office deduction: You don't need a dedicated room — but the space must be used regularly and exclusively for business. Calculate the square footage of your workspace as a percentage of your home's total area. That percentage of utilities, rent (or mortgage interest in the US), and maintenance can be deducted.

Better deductions mean a lower tax bill. A lower tax bill means your set-aside rate can go down — which means more money in your pocket on an ongoing basis. It's worth an hour with an accountant once a year to find what you're missing.

Building the Habit

The mechanics of self-employed tax management aren't complicated. What's hard is making it automatic — so you're not making a judgment call about whether to move money every time a client pays you.

The system that works:

1. Every payment received goes into your operating account.
2. Within 24 hours (or automatically), transfer your set-aside percentage to your tax reserve account.
3. Pay yourself the rest — or a portion of it if you want to build a business buffer too.
4. When quarterly payments are due, pay from the tax reserve account.
5. After annual filing, whatever's left in the reserve rolls forward to the next year or covers a refund-free balance.

That's it. The goal is to make tax obligations boring — a predictable line item that never catches you off guard.