1099 Taxes and the Write-Offs People Forget Until April

If you got paid on a 1099, nobody withheld federal income tax for you. They also didn’t take out Social Security or Medicare the way a W-2 job does. That second part surprises people every spring.

Self-employment tax is roughly 15.3% on net earnings (with nuances). Stack income tax on top. Suddenly the “great freelance rate” looks different.

Start from net, not gross

Your taxable base is income minus ordinary and necessary business expenses. Mileage, software, a slice of home office (if you qualify), equipment, contractor fees—documented, not imagined. Receipts beat memory.

I run a rough annual picture mid-year with the 1099 tax calculator with write-offs, then again when Q3 closes. It’s not a filing substitute. It stops the “how is this bill real” moment.

Quarterly estimates exist for a reason

The IRS expects money through the year if you owe enough. Miss estimates and you can owe underpayment penalties even if you pay in full by April. Set a calendar reminder the same day clients pay you. Boring systems beat clever ones.

Common misses

• Health insurance premiums (sometimes deductible above the line for self-employed people—rules apply).
• Half of SE tax as an adjustment—easy to overlook if you’re doing napkin math.
• State taxes. Federal calculators don’t pay your state for you.
• Mixing personal and business cards until expenses are fiction.

If the calculator output still scares you, good—that means you’re looking early enough to change behavior: raise rates, cut tools you don’t use, or park cash for taxes before it becomes lifestyle.