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Being a solopreneur comes with plenty of benefits: You025 Archivesset your own hours, decide your own business priorities, and kiss performance reviews goodbye. But a one-and-done tax season? That is not one of them.

In many cases, independent workers must pay the tax they owe not in one lump on April 15 but in four installments throughout the year. These payments are the dreaded quarterly, or estimated, taxes

Quarterly taxes can be confusing, but they don't have to be scary. Once you know the basics — and debunk a few pesky myths — you'll be in good shape.

What are quarterly taxes?

The IRS requires independent workers, including freelancers, contractors, and solopreneurs, to pay taxes on their income throughout the year instead of all at once. This is because without an employer involved, that income is not automatically taxed when you receive it — and the IRS wants its cash.
There are four quarterly tax deadlines throughout the year. They are:

• January 15

• April 15

• June 15

• September 15

If a deadline falls on a weekend or holiday, it will shift to the next business day.

Who has to pay quarterly taxes?

Assume you must make quarterly payments if you expect to owe $1,000 or more in taxes on your non-W-2 income throughout the year. (If you're not sure, there are plenty of tax estimators out there to give you an idea — including a tax calculatorfrom Mashable's No. 1 tax software pick for freelance filers, H&R Block.)

Non-W-2 income includes self-employment income, the type of income you make as a solopreneur. Take it from the IRS: "If you are in business for yourself, you generally need to make estimated tax payments."

How to estimate and pay quarterly taxes

OK, so you owe quarterly taxes. How do you figure out how much to pay each quarter? This question can be especially vexing for solopreneurs with seasonally inconsistent income. If you make twice as much in the summer as in the winter, for example, how do you know how much to pay?

According to Logan Allec, a CPA and owner of the tax relief company Choice Tax Relief, there are a few ways you can estimate your payments. The first is simply to set aside a percentage of what you earn every quarter and pay that amount. (This percentage could be your effective tax ratefrom the previous year; otherwise, around 30% is a solid rule of thumb.) If you end up overpaying, you'll eventually get that overpayment back as a tax refund from the IRS.

The second method takes advantage of what's called the prior year safe harbor rule. Under this rule, the IRS will not charge you underpayment penalties if you pay the same amount in taxes that you paid the previous year. So if you divide your tax liability from the previous year by four, then pay that amount each quarter, you'll be on good terms with the IRS no matter what. 

If your business has grown a lot since last year, though, use this method with caution: "You may end up owing more than you expected when you actually file this year's tax return if you made a lot more this year than [you did] last year," Allec says.

Finally, you can make an estimation using a little math. Each quarter, add up your actual income, multiply it by four (this will "annualize" it to the entire year), and then calculate your hypothetical yearly tax liability based on this amount. Divide that number by four, and you've got your estimated quarterly payment.

Once you've figured out your amount, you can make the actual payment through the IRS direct pay portal— or, if you're really old school, you can send a check.

Business deductions as a solopreneur

If you're self-employed as a solopreneur, you can deduct expenses that are "ordinary and necessary" for your business — things like home office expenses, postage and shipping costs, and business-related car expenses. Deducting these expenses will lower your tax bill. 

Here's how it works. Let's say you made $8,000 as a Depop sellerduring the year. However, you spent $1,000 on postage, packaging, driving to the post office, and other business-related expenses. 

That $1,000 is tax-deductible, meaning it'll be subtracted from your taxable income and not subject to taxes. Why? You didn't get to enjoy $8,000 of income. After expenses, you only got to enjoy $7,000. Therefore, you'll be taxed on $7,000 of income — as long as you remember to claim your deductions.

Quarterly tax tips

Tax tip #1: Don't forget state taxes

Allec points out that in states that charge state income tax, you might have to make estimated quarterly state payments as well. "Apart from simply ignoring (or being completely unaware) of the requirement for state quarterly tax payments," he says, "some taxpayers assume that the payments work the same for federal as they do for state." Make sure you know the rules for your state to avoid an unexpected bill.

Tax tip #2: Take advantage of deductions

Remember those business deductions! They can make all the difference — and if you don't take them, you're effectively leaving free money on the table. If you're unsure what you can deduct, a CPA can help you out. Tax filing platforms like TurboTax can also assist you with business deductions, often for an additional fee or at a pricier tier. There are even apps like Keeperand FlyFinthat you can use to track your business expenses throughout the year.

Tax tip #3: Get serious about bookkeeping

Paying quarterlies can make filing taxes a lot easier: You'll only have to deal with a few months of finances at a time rather than an entire year's worth. To avoid errors, though, it's essential to keep careful records: what you're bringing in (profits and losses), what you're spending on business expenses, and what you expect your tax burden to be. (Again, 30% is a good rule of thumb.) Whether you go the spreadsheet route, opt for software like QuickBooks, or hire someone to manage it all for you, record-keeping throughout the year will mean a lot less headache when it's time to file.

Tax tip #4: You canmake payments more often

OK, paying taxes even more often than quarterly does sound like a nightmare. But if you budget monthly or biweekly, making payments in tandem with the rest of your bills might be helpful. It doesn't really matter when or how often you make your payments as long as you're up to date by the end of each quarter. Do what works best for you!

Tax tip #5: Don't be afraid to hire a pro

If you're overwhelmed by your taxes, having trouble keeping up with your bookkeeping, or just don't want to deal with it, don't be afraid to work with a CPA, Allec says. It's an investment, but it's worth it for plenty of solopreneurs — plus, an accountant can help you minimize your bill come tax time.