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Freelance Tax Set-Aside Calculator

Estimate the percentage of each freelance invoice to park in a separate tax savings account so quarterly / year-end tax bills are fully funded with no panic.

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Freelancers and self-employed contractors pay tax in arrears, often quarterly, and the bill can be alarmingly large for first-year freelancers who treated every invoice payment as spendable income. This calculator estimates the percentage of each payment you should park in a separate tax savings account so the year-end / quarterly bill is fully funded — with a small safety buffer for bracket creep and missed deductions.

Enter your average monthly gross revenue, your effective income tax bracket, your self-employment / national insurance rate (US SE tax 15.3%, UK Class 4 ~9%, AU 0%), state or local rate if applicable, an estimate of business expenses you'll deduct as a percentage of revenue (10-25% is typical for service freelancers), and a small buffer for safety. The output is the percentage of each invoice to set aside, the monthly dollar amount, and a quarterly estimated-payment figure.

Examples

US freelancer, $10k/month, moderate income

$10k/mo, 22% federal, 15.3% SE, 5% state, 15% deductibles, 5% buffer → taxable share 85%, combined rate 42.3%, set-aside ≈ 41.0% of gross = $4,100/mo. Quarterly estimated payment ≈ $12,300.

UK contractor outside IR35, £8k/month

£8k/mo (treat as $ in the calculator), 40% UK higher rate, 9% Class 4 NI, 0% state, 15% deductibles, 5% buffer → taxable share 85%, combined rate 49%, set-aside ≈ 46.6% of gross = ~£3,730/mo. UK self-assessment is annual but the savings discipline is the same.

AU sole trader, AU$8k/month

AU$8k/mo, 32.5% income tax bracket, 0% SE (sole traders pay only income tax), 0% state, 15% deductibles, 5% buffer → taxable share 85%, combined 32.5%, set-aside ≈ 32.6% of gross = AU$2,608/mo. AU PAYG instalments are quarterly.

Frequently Asked Questions

Should this money sit in a separate account?
Yes — physically separate, ideally a high-yield savings account that does not have a debit card attached. The number-one reason freelancers fail to pay quarterly tax is co-mingling tax savings with operating cash and "borrowing" against it. Out of sight is the only reliable discipline.
Why is self-employment tax so high in the US?
15.3% covers both the employee and employer halves of Social Security (12.4%) and Medicare (2.9%) contributions. As an employee, your employer paid half; as a freelancer, you pay both. Half of the SE tax is itself deductible from your federal income tax, slightly softening the blow — the calculator does not model this nuance.
What if my income varies wildly month to month?
Calculate the set-aside % once (using your annual income / 12 as the gross input). Apply that fixed percentage to every invoice as it lands. Lumpy months self-correct: a high-revenue month sets aside proportionally more, low months less, and over the year the totals match.
How does this connect to quarterly estimated payments?
The quarterly figure shown is what you would pay to your tax authority each quarter (US: April / June / September / January). Pay from the savings account; if you have set aside the full %, the account never runs dry. UK self-assessment is annual + 2 payments on account (similar dynamic).
What happens if I get a big surprise deduction I didn't account for?
You over-saved — the surplus carries to the next quarter. Better than the reverse. Treat the buffer as the absorber of small surprises (5% covers ~$5k of unexpected tax on $100k gross income). For larger swings, recalculate.

References

  1. IRS — Estimated Taxes for Self-Employed — https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
  2. HMRC — Self Assessment payment dates — https://www.gov.uk/pay-self-assessment-tax-bill
  3. ATO — PAYG instalments for sole traders — https://www.ato.gov.au/businesses-and-organisations/income-deductions-and-concessions/payg-instalments
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Did you know?
Calculators are estimates. Consult professionals for critical decisions.

Freelancers and self-employed contractors pay tax in arrears, often quarterly, and the bill can be alarmingly large for first-year freelancers who treated every invoice payment as spendable income. This calculator estimates the percentage of each payment you should park in a separate tax savings account so the year-end / quarterly bill is fully funded — with a small safety buffer for bracket creep and missed deductions.

How to Use This Calculator

Enter your average monthly gross revenue, your effective income tax bracket, your self-employment / national insurance rate (US SE tax 15.3%, UK Class 4 ~9%, AU 0%), state or local rate if applicable, an estimate of business expenses you'll deduct as a percentage of revenue (10-25% is typical for service freelancers), and a small buffer for safety. The output is the percentage of each invoice to set aside, the monthly dollar amount, and a quarterly estimated-payment figure.

Understanding the Formula

Taxable share = 1 − deductible business expenses %. Combined tax rate = income tax + state/local tax + self-employment tax. Set-aside % of gross = combined rate × taxable share + buffer. Monthly set-aside = gross income × set-aside %. Quarterly estimated payment = (gross income × 12 × set-aside %) / 4.

Examples

US freelancer, $10k/month, moderate income

$10k/mo, 22% federal, 15.3% SE, 5% state, 15% deductibles, 5% buffer → taxable share 85%, combined rate 42.3%, set-aside ≈ 41.0% of gross = $4,100/mo. Quarterly estimated payment ≈ $12,300.

UK contractor outside IR35, £8k/month

£8k/mo (treat as $ in the calculator), 40% UK higher rate, 9% Class 4 NI, 0% state, 15% deductibles, 5% buffer → taxable share 85%, combined rate 49%, set-aside ≈ 46.6% of gross = ~£3,730/mo. UK self-assessment is annual but the savings discipline is the same.

AU sole trader, AU$8k/month

AU$8k/mo, 32.5% income tax bracket, 0% SE (sole traders pay only income tax), 0% state, 15% deductibles, 5% buffer → taxable share 85%, combined 32.5%, set-aside ≈ 32.6% of gross = AU$2,608/mo. AU PAYG instalments are quarterly.

Frequently Asked Questions

Should this money sit in a separate account?

Yes — physically separate, ideally a high-yield savings account that does not have a debit card attached. The number-one reason freelancers fail to pay quarterly tax is co-mingling tax savings with operating cash and "borrowing" against it. Out of sight is the only reliable discipline.

Why is self-employment tax so high in the US?

15.3% covers both the employee and employer halves of Social Security (12.4%) and Medicare (2.9%) contributions. As an employee, your employer paid half; as a freelancer, you pay both. Half of the SE tax is itself deductible from your federal income tax, slightly softening the blow — the calculator does not model this nuance.

What if my income varies wildly month to month?

Calculate the set-aside % once (using your annual income / 12 as the gross input). Apply that fixed percentage to every invoice as it lands. Lumpy months self-correct: a high-revenue month sets aside proportionally more, low months less, and over the year the totals match.

How does this connect to quarterly estimated payments?

The quarterly figure shown is what you would pay to your tax authority each quarter (US: April / June / September / January). Pay from the savings account; if you have set aside the full %, the account never runs dry. UK self-assessment is annual + 2 payments on account (similar dynamic).

What happens if I get a big surprise deduction I didn't account for?

You over-saved — the surplus carries to the next quarter. Better than the reverse. Treat the buffer as the absorber of small surprises (5% covers ~$5k of unexpected tax on $100k gross income). For larger swings, recalculate.

Assumptions & Limitations

  • Income is steady. Real freelance income is lumpy; a high-income month can push you into a higher bracket and the calculator will under-estimate. Re-run with the higher bracket in months that exceed average.
  • Business deductions are reasonable estimates. Wildly under-counting deductions over-funds the set-aside (mild) — wildly over-counting under-funds it (real risk).
  • The self-employment tax rate is jurisdiction-specific. US: 15.3% on net earnings up to the Social Security wage base, then 2.9% Medicare. UK: Class 2 NI flat (~£3.45/wk) + Class 4 NI ~9% over the lower profits limit. AU: sole traders pay only income tax (no separate SE rate). Set the input accordingly.
  • No quarterly safe-harbor accounting. US freelancers paying estimated tax can avoid penalties by paying 100% of last year (110% above $150k AGI) or 90% of current year — set buffer accordingly if cash-flow is tight.
  • Health insurance, retirement contributions, and other deductions that reduce taxable income are NOT modelled separately; bake them into the deductibles % if you take them.

References

  1. IRS — Estimated Taxes for Self-Employed — https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
  2. HMRC — Self Assessment payment dates — https://www.gov.uk/pay-self-assessment-tax-bill
  3. ATO — PAYG instalments for sole traders — https://www.ato.gov.au/businesses-and-organisations/income-deductions-and-concessions/payg-instalments