BizTaxCalc Blog: How-to
Guides and comparisons on business and freelance tax across 13 countries, written to be genuinely useful and backed by official sources.
How-to
US Federal Tax Brackets 2026 Explained: Marginal vs Effective Rate
Moving into a higher tax bracket never taxes all of your income at that rate: here are the complete 2026 federal brackets for every filing status, the standard deduction amounts, and the exact arithmetic that turns a 22% marginal rate into a 12.71% effective one.
How-to
Your First Year as a UK Limited Company: Every Tax and Deadline
A complete first year map for a new UK limited company, from the split corporation tax period and Companies House deadlines to PAYE, VAT registration and your first self assessment.
How-to
UK Dividend Tax Explained for Company Directors (2026/27)
A practitioner's guide to how UK dividend tax actually works for owner-directors, including the April 2026 rate rise and how to plan distributions across tax years.
How-to
UK Contractor Day Rates: What You Really Take Home
A practitioner's guide to converting a UK contractor day rate into realistic annual revenue and actual take-home pay in 2026/27, inside and outside IR35.
How-to
USC and PRSI explained for the Irish self-employed
USC and PRSI are two separate charges that sit on top of Irish income tax, and between them they turn a 40% headline rate into a marginal burden of over 52% for the self-employed.
How-to
CPP for the Self-Employed in Canada: Why You Pay Both Halves
If you work for yourself in Canada you pay both the employee and employer halves of CPP, and here is exactly what that costs in 2026, what you get back at tax time, and what it buys you at 65.
How-to
How to Avoid the Estimated Tax Penalty: Safe Harbor Rules Explained
The estimated tax penalty is really daily interest, and you avoid it by hitting a safe harbor rather than by forecasting your income correctly: here are the 90/100/110 rules, the 2026 payment calendar, and an exact penalty computation showing how $20,240 paid in the wrong pattern costs $236.26.
How-to
GST registration in Australia: the AUD 75,000 threshold explained
The $75,000 GST threshold is measured on a rolling 12-month basis, not by financial year, and getting that wrong is the single most expensive mistake a small Australian business makes.
How-to
1099-K and Gig Economy Taxes: Uber, DoorDash, Etsy and the Reporting Threshold
The 1099-K reports gross platform payouts, not taxable income: here is the 2026 reporting threshold, how to deduct platform fees and the split 72.5 and 76 cent mileage rates, and a full worked reconciliation from a $59,800 payout to a $3,972 federal bill.
How-to
UK VAT Registration: When You Must Register and What It Costs You
A practical guide to the £90,000 rolling VAT threshold, the 30-day forward look test, voluntary registration and the Flat Rate Scheme, with the pricing maths most guides skip.
How-to
Salary vs Dividends for a UK Director: The Most Tax-Efficient Split
A director of a UK limited company almost always ends up better off taking a £12,570 salary plus dividends, and this guide shows exactly how many pounds that choice is worth, with the 2026/27 rates and a full worked example.
How-to
S-Corp Reasonable Salary: How to Set It Without Triggering an IRS Audit
A practical, numbers-first guide to setting an S-corp owner salary that survives IRS scrutiny, with the 2026 FICA thresholds, the factors the courts actually apply, and a full worked example.
How-to
Quarterly Estimated Taxes Explained: How Much to Pay and When (2026)
A practical, numbers-first guide to 2026 quarterly estimated taxes: the four 1040-ES deadlines, the safe harbor percentages that make you penalty-proof, and exactly how to compute each payment.
How-to
The QBI Deduction (Section 199A) Explained: How Freelancers Get 20% Off Their Taxable Income
The Section 199A qualified business income deduction can cut a freelancer's federal tax bill by thousands of dollars, but only if you understand the income thresholds, the SSTB phase-out and the W-2 wage limit that decide how much of it you actually keep.
How-to
Payment on Account Explained: Why Your First January Tax Bill Is 150%
In your first year of Self Assessment you pay last year's tax bill plus half of it again on 31 January, and here is exactly how that 150% is calculated, when you can reduce it, and how much to put aside.
How-to
National Insurance Explained: Class 1, 2 and 4 for 2025/26
A practical breakdown of UK National Insurance for the 2025/26 tax year, covering what employees, employers and the self-employed actually pay, the April 2025 changes, and what those contributions buy you.
How-to
IR35 Inside vs Outside Explained: What It Actually Costs You
A contractor's guide to how IR35 status is actually determined, what the deemed payment is, and the real 2026/27 take-home gap between inside and outside on a typical day rate.
How-to
How to Pay Yourself From an LLC: Owner Draws vs Salary
A practical guide to paying yourself from an LLC in 2026, covering owner draws, guaranteed payments, S-corp payroll, self-employment tax, and the profit level at which switching to a salary starts to save real money.
How-to
GST/HST for Canadian Freelancers: The CAD 30,000 Rule Explained
A practical walkthrough of the CAD 30,000 small supplier threshold: the two tests that end it, which rate to charge each client, how input tax credits work, and when the Quick Method leaves you better off.
How-to
Freelance Tax Deductions in the USA: The Complete 2026 List
A practical, rule-by-rule guide to every deduction a US freelancer can claim on Schedule C in 2026, with the real IRS limits, a worked example on $120,000 of 1099 income, and the write-offs that will get you in trouble.
How-to
Self-Employment Tax in the USA Explained (2026)
A clear, worked-through guide to US self-employment tax in 2026: the 15.3% rate, the 92.35% net-earnings base, the Social Security cap, the deductible half, and how an S-corp election can lower the bill.
How-to
What Is a Profitability Coefficient? Flat-Rate Tax Explained
Flat-rate tax regimes do not tax your full turnover. They apply a profitability coefficient to estimate your profit, and that single percentage decides how much tax you pay. Here is how it works.
How-to
How to Reduce Your Freelance Tax Bill Legally (2026)
A practical, strictly legal guide to lowering your freelance tax bill in 2026 through smart regime choice, legitimate deductions, retirement contributions, business structure, and income timing.
How-to
How Much Should You Set Aside for Taxes as a Freelancer? (2026)
Most freelancers under-save for taxes and get a nasty surprise at filing time. Here is a country-by-country breakdown of how much to set aside in 2026, plus a simple system to never fall short again.
How-to
How Dividends Are Taxed by Country in 2026
Dividend tax rules differ enormously between countries, from simple flat rates to tiered and marginal systems. Here is how dividends are taxed across major economies in 2026, with a clear comparison table.
How-to