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Calculator · Free

1099 Estimated Tax Calculator

Figure quarterly estimated tax for 1099 contractors — federal income tax, self-employment tax, and what to set aside from each check.

Filing status
1099 / Schedule C income

Gross revenue from your trade business before expenses.

$/yr

Total payments from customers, before you subtract expenses.

$/yr

Vehicle, tools, insurance, materials, subs, license, phone — everything on Schedule C.

Other income & withholding
$/yr

Reduces Social Security tax on overlapping SE earnings.

$/yr
$/yr

Interest, dividends, spouse W-2 not entered above, etc.

Approximate flat rate. Enter your state's effective rate if you know it.

Payments & safe harbor
$

Line 24 on last year's Form 1040. Used for safe harbor.

$

Determines whether safe harbor is 100% or 110% of prior tax.

$

Set aside from each 1099 check

20%of gross income

$27,832 total estimated tax for 2026 after W-2 withholding. $9,277 per remaining quarterly payment.
Net Schedule C profit$145,000 gross minus $38,000 expenses
$107,000
Self-employment tax15.3% on 92.35% of net profit (Schedule SE)
$15,119
Federal income tax22% marginal bracket
$9,380
State income tax
$3,334
Total tax liability
$27,832
Less W-2 withholding
−$0
Estimated tax due
$27,832
Monthly set-asideTransfer this much to a tax account each month
$2,319
Quarterly payment schedule
QuarterDue dateAmountStatus
Q1Apr 15$0Paid
Q2Jun 15$9,277Due now
Q3Sep 15$9,277Upcoming
Q4Jan 15 (next year)$9,277Upcoming
Annual total$27,832
Tax breakdown
ComponentAmountNotes
Adjusted gross income (AGI)$99,441After SE tax deduction
Standard deduction$16,100Single
QBI deduction−$16,66820% of qualified business income
Taxable income$66,673
Federal income tax$9,38019.2% effective on gross
Self-employment tax$15,119Social Security + Medicare
SE tax deduction (AGI)−$7,559Half of SE tax
State income tax$3,3345% flat rate
Total liability$27,832

Safe harbor shortfall: $22,000

Safe harbor requires $22,000 in total payments (100% of prior-year tax). You are $22,000 short — catch up on your next payment to avoid Form 2210 penalties.

Transfer tax money the day you get paid

At 20% of gross, a $5,000 deposit means moving $1,008 to a separate tax account immediately. Waiting until quarter-end is how contractors spend their tax money on a slow month and get hit with penalties in April.

Quick answer

Self-employed tradespeople generally owe federal estimated tax four times a year: April 15, June 15, September 15, and January 15 (following year). A practical rule is to set aside 25–35% of net profit for federal tax plus state, but your bracket and deductions change that. Use last year's liability or annualized current profit to avoid underpayment penalties. Enter expected net profit below for a rough quarterly payment schedule — not a substitute for a CPA.

What this assumes

  • Uses 2026 federal tax brackets, standard deduction, and Schedule SE self-employment tax rates.
  • State tax is a flat rate you enter — actual state rules vary by jurisdiction.
  • QBI deduction is simplified at 20% of net business income; complex limitations are not modeled.

Important

This is an estimate, not tax advice. Tax law changes, AMT, credits, and state rules can change your actual liability. Consult a CPA or enrolled agent before filing.

Understanding the result

1099 contractors pay tax quarterly, not annually

When nobody withholds from your checks, the IRS expects estimated payments four times a year — April 15, June 15, September 15, and January 15. Miss a payment and you owe the tax plus a penalty, even if you get a refund in April.

Self-employment tax is the surprise

On top of income tax, you pay 15.3% self-employment tax on 92.35% of net profit — both the employer and employee share of Social Security and Medicare. A plumber netting $80,000 owes roughly $11,300 in SE tax before a single dollar of income tax.

Set aside from every deposit

The simplest discipline: transfer 25 to 35% of every 1099 payment to a separate tax account the day it lands. The exact percentage depends on your bracket, state, and deductions — this calculator gives you the number for your situation.

Safe harbor protects you from penalties

Pay at least 100% of last year's total tax (110% if prior AGI exceeded $150,000) through withholding plus estimated payments, and the IRS will not penalize you even if you owe more in April. Most contractors use prior-year safe harbor as their quarterly target.

How the math works

Net self-employment income × SE tax and estimated income tax bracket (federal + state rate you enter) ÷ four quarterly payments = recommended ES payment. Optional safe harbor uses prior year tax for penalty avoidance.

Where to find each input

  • Projected net Schedule C profit
  • Other W-2 income and withholding
  • Prior year total tax — Form 1040 line for safe harbor
  • State estimated rate — flat entry

Worked examples

Solo plumber net $85k, single filer

22% federal marginal + 15.3% SE on 92.35% net, no W-2.

Rough combined ~30–35% effective on net before deductions — quarterly ~$7k–$8k total annual tax spread.

Side gig $18k with W-2 job

W-2 covers safe harbor on day job.

ES on side income only — smaller quarterly on gig profit.

Prior year tax $24k, safe harbor

Pay 100% prior year in four payments.

Each payment $6k regardless of current year swing — penalty shield if income drops.

What this does not include

  • Deduction optimization or QBI detail
  • Local city business tax
  • Sales tax remittance
  • Entity choice (S-corp reasonable salary)

Regional adjustment

State income tax rates vary 0–13%+; enter yours. No regional default replaces CPA review.

Accuracy and references

SE tax rate per IRC §1401; quarterly due dates IRS Publication 505. Not tax advice.

Counterpart bridge

What homeowners see for the same decision

Homeowners use the paired tool for benchmarks and questions before they hire. Align your numbers with what they are already comparing against.

Open Cash Runway Calculator

Homeowner counterpart

We publish Cash Runway Calculator for the same decision from the customer side — use it to sanity-check how your bid will read against national ranges.

View Cash Runway

Common questions

How much should a 1099 contractor set aside for taxes?
Most trade contractors set aside 25 to 35% of gross 1099 income. A sole proprietor netting $100,000 typically owes $15,000 to $22,000 in combined federal income and self-employment tax, plus state tax. Set aside from every check, not once a quarter.
When are quarterly estimated tax payments due?
April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 of the following year (Q4). If a due date falls on a weekend or holiday, the next business day applies. Pay at irs.gov/payments or by mail with Form 1040-ES.
What is self-employment tax for contractors?
Self-employment tax is 15.3% on 92.35% of net Schedule C profit: 12.4% Social Security up to the wage base ($184,500 in 2026) plus 2.9% Medicare on all earnings. It replaces the FICA tax W-2 employees split with their employer.
Do I need to pay estimated taxes if I also have a W-2 job?
Yes, if your W-2 withholding does not cover tax on your 1099 income. Increase W-4 withholding or make estimated payments on the side income. Combined W-2 wages reduce the Social Security portion of SE tax on overlapping earnings.
What expenses can a contractor deduct?
Common Schedule C deductions: vehicle expenses (mileage or actual), tools and equipment, insurance, license fees, subcontractor payments, materials, phone, home office, continuing education, and bank fees. Keep receipts — the IRS matches 1099 income to bank deposits.
What is the safe harbor for estimated taxes?
Pay at least 90% of current-year tax or 100% of prior-year tax (110% if prior AGI exceeded $150,000) through withholding plus estimated payments to avoid underpayment penalties. Most contractors target the prior-year safe harbor because it is a known number.
How do I calculate estimated tax for an LLC?
Single-member LLCs file Schedule C like a sole proprietor — same estimated tax rules. Multi-member LLCs and S-corps have different rules (K-1 income, quarterly payroll for owners). This calculator is for sole proprietors and single-member LLCs filing Schedule C.
Can I deduct my truck for taxes?
Yes — either the IRS standard mileage rate ($0.70/mile in 2025) or actual expenses (payment, fuel, insurance, maintenance, depreciation). You must track business vs. personal miles. Commuting from home to a regular job site is not deductible.
What happens if I miss a quarterly estimated tax payment?
The IRS charges an underpayment penalty calculated on Form 2210 — roughly 8% annualized on the shortfall for the period. You still owe the tax in April. Catch up on the next payment; the penalty is proportional to how long you were short.
Should I make estimated payments monthly instead of quarterly?
Yes — many contractors pay monthly or even per-deposit because it is easier to budget. The IRS only requires the cumulative amount by each quarterly due date. Paying more frequently reduces the risk of spending tax money on a slow month.
Is this tax advice?
No. Planning estimate only — file with CPA or enrolled agent.
When are quarters due?
Apr 15, Jun 15, Sep 15, Jan 15 — adjust for weekends.
Safe harbor 110% rule?
High AGI may need 110% of prior year — toggle if applicable.
What about S-corp?
Use payroll withholding on W-2 portion; tool is Schedule C oriented.
Include state?
Enter flat state rate on net or separate calculator.
Underpayment penalty?
Pay safe harbor or 90% current year to reduce penalty risk.
Deductions?
Enter net after expenses you already know — not full deduction wizard.
Married filing jointly?
Use combined income and withholding inputs.
What if income spikes Q4?
Annualize option or pay catch-up in Q4 payment.
Separate account for taxes?
Best practice — transfer each payment when due.

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