The short answer: 25–30% of net self-employment income is a reasonable starting point for most contractors. That covers federal income tax, self-employment tax, and state income tax (where applicable). Some people will land lower; some higher. But 25–30% is the right ballpark to start with, and being slightly over is far better than being under.
This guide walks through why that number is what it is, how to make quarterly payments, and how to figure out your actual savings rate as you go.
This is educational content, not tax advice — talk to a CPA for your specific numbers.
Why W-2 employees don't think about this
If you've only ever been a W-2 employee, taxes were largely invisible. Your employer withheld income tax, FICA (Social Security and Medicare), and any state tax from each paycheck and sent it to the government on your behalf. You filed a return once a year to true up the math.
When you become a 1099 contractor, all of that stops. No one is withholding anything. Every dollar that hits your account is gross — you're responsible for the tax portion, and you have to set it aside yourself.
That switch catches a lot of people off guard.
What you actually owe as a 1099 contractor
Three layers of tax apply to most self-employed earnings:
1. Self-employment tax (15.3%)
This is the equivalent of FICA — Social Security and Medicare. When you were a W-2 employee, you paid half (7.65%) and your employer paid the other half. As a contractor, you pay both halves yourself, which is 15.3% total.
This applies to net self-employment income — your gross 1099 income minus your business expenses (deductions). It's calculated on roughly the first ~$168,600 of net earnings (the Social Security wage base, which adjusts annually); after that, only the 2.9% Medicare portion applies.
Note: half of your self-employment tax is deductible against your income for income tax purposes. Your tax software or CPA handles this automatically.
2. Federal income tax
Same brackets as W-2 employees — the 2025 federal brackets run from 10% to 37%. What bracket you land in depends on your total taxable income, which is your net self-employment income (plus any other income) minus the standard deduction (or itemized deductions) and the qualified business income (QBI) deduction if you qualify.
For most contractors with modest income, the effective federal income tax rate after deductions ends up in the 10–22% range.
3. State income tax
Depends on where you live:
- Florida, Texas, Tennessee, and a few other states — no state income tax
- Most other states — anywhere from 3% to 13% on top of federal
If you're in Florida (or another no-income-tax state), you can think about state tax as not applicable. If you're in a state with income tax, add it to your set-aside calculation.
Why 25–30% is the rule of thumb
For a contractor with modest income, the math typically looks like:
- Self-employment tax: ~14% (15.3% × 92.35%, since SE tax is calculated on 92.35% of net earnings)
- Federal income tax: ~10–15% (after deductions)
- State income tax: 0% in Florida; up to 5–8% elsewhere
For a Florida contractor with no state income tax, that's roughly 24–29% combined — call it 25%.
For a contractor in a state with income tax, that's roughly 30–35% combined.
For higher-income contractors, the percentage gets larger — federal brackets rise, and you might need to set aside 35% or more.
A safe starting rule for most contractors: set aside 25–30% of every payment. If you're in a high-tax state or higher income bracket, lean toward 30–35%.
How to actually set aside
The mechanics are simple — it's the discipline that's hard:
- Open a separate savings account dedicated to tax. Don't mix it with operating funds.
- Every time you get paid, immediately transfer 25–30% of the gross to that account.
- Don't touch it for anything other than tax payments.
A separate account creates a clean rule: money in this account isn't available for the business or you. It's earmarked. The mental separation matters.
Some contractors use a high-yield savings account and earn 4–5% interest on the tax money while it sits — small bonus.
Quarterly estimated taxes
The IRS expects self-employed earners to pay tax throughout the year — not just at filing time. You do this through quarterly estimated tax payments.
The 2026 due dates:
- Q1: April 15
- Q2: June 16
- Q3: September 15
- Q4: January 15, 2027 (for 2026 income)
(Note: when a date falls on a weekend or holiday, the deadline shifts to the next business day.)
Each quarter, you estimate what you owe based on income for the period and send the payment to the IRS (and your state, if applicable). Your tax-savings account is what you pay from.
You can pay quarterly estimates through:
- IRS Direct Pay (free, online)
- EFTPS (the IRS's electronic payment system)
- Form 1040-ES (paper voucher)
State estimates have their own portals.
Safe harbor: how to avoid an underpayment penalty
The IRS doesn't just care that you pay your full tax bill by April 15 — they want it paid throughout the year. If you under-pay during the year, you can face an underpayment penalty even if you settle up at filing time.
The "safe harbor" rules: you generally avoid the penalty if you pay throughout the year (via withholding or estimates) at least:
- 100% of last year's total tax liability (110% if your AGI was over $150k), or
- 90% of this year's tax liability
For new contractors with no prior year of self-employment, the cleanest strategy is to estimate this year's tax liability and pay 25% of it each quarter.
Common mistakes
The patterns we see most often:
- Not setting aside anything — every dollar gets spent before tax is paid
- Setting aside the wrong percentage — usually too low
- Mixing tax savings with operating account — money gets spent on "emergencies"
- Skipping quarterly payments — leads to underpayment penalties at filing
- Forgetting state tax — relevant in 41 states
- Not adjusting as income grows — what worked at $50k may not work at $150k
How clean bookkeeping makes this easier
If you don't know your actual net self-employment income each month, you can't calculate a reliable percentage to set aside. You're either over-saving (giving the IRS a free loan) or under-saving (about to get hit with a tax bill you didn't see coming).
Monthly bookkeeping fixes this. You see actual income, actual expenses, actual net profit — and you can set aside the right amount based on real numbers, not guesses. Quarterly estimated payments become accurate rather than rough approximations.
This is one of the biggest practical reasons self-employed contractors benefit from monthly bookkeeping.
Frequently asked questions
You'll owe the difference at filing time, plus a possible underpayment penalty if you didn't meet safe harbor rules during the year. The penalty isn't crippling for most contractors, but it's avoidable.
Technically yes, but the IRS will likely assess an underpayment penalty. They want tax paid throughout the year, not in one lump sum at filing.
That's normal for contractors. Set aside 25–30% of every payment as it comes in, even when income is variable. If you have an unusually high month, set aside more on that month's income — the percentage scales naturally.
Online is easier. IRS Direct Pay (irs.gov/payments) lets you pay quarterly estimates directly from your bank account, free, with no need to mail anything. EFTPS is another free option that lets you schedule payments in advance.
Where to start
If you're newly self-employed and feeling exposed on the tax side, start with the discipline first: separate savings account, 25–30% of every payment, no exceptions. Then layer in monthly bookkeeping so the math gets more precise as you go.
SoFlo360 helps self-employed contractors keep their books current so quarterly tax planning is realistic, not a guess. Spanish-friendly support is available for contractors who'd rather handle financial conversations in Spanish.
Book a free consultation or learn more about our bookkeeping services.
This post is educational content, not tax advice. For your specific tax situation, consult a qualified CPA or tax professional.