Quirkulator

Tax Calculators

21 calculators covering sales tax, VAT, GST and income tax, each with its formula and worked examples.

Tax Calculators brings together 21 calculators for sales tax, VAT, GST and income tax, including Bonus Tax Calculator, Cost Per Unit Calculator, Income Tax Estimate Calculator and Sales Tax Calculator.

These are separate pages rather than one tool with a mode switch because the inputs differ, the interpretation differs, and the question behind each one is different. Each page opens with the formula it uses, defines every variable, and walks the calculation through real numbers before you type anything.

All 21 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Money & Finance, and every page links to the neighbouring calculations you usually need next.

21 pages in this collection

Bonus Tax CalculatorSee what actually lands in your account after a bonus is withheld at the supplemental rate.Bulk Discount CalculatorApply tiered volume discounts and check whether buying up to the next tier actually saves money.Capital Gains Tax CalculatorWork out tax on an investment gain, and what the holding period changes.Commission CalculatorWork out commission on a sale, including any split with a broker or house.Cost Per Unit CalculatorSplit fixed and variable costs across a production run to find the true unit cost.Discount CalculatorApply one or two stacked discounts and see the real combined percentage off.GST CalculatorAdd or remove goods and services tax at any rate, with the CGST and SGST split.Income Tax CalculatorApply progressive tax brackets to your income and see marginal and effective rates.Income Tax Estimate CalculatorApply an editable set of tax brackets to your income for a rough liability estimate.Invoice Total CalculatorBuild an invoice total from quantity, rate, discount, tax and shipping in the right order.Markup CalculatorAdd a markup to cost to get a selling price, and see the margin it really gives.Profit Margin CalculatorExpress profit as a percentage of revenue, at both the gross and net level.Sales Tax CalculatorAdd state, county and city sales tax to a price, or work backwards from the total.Self-Employment Tax CalculatorCalculate Social Security and Medicare tax on self-employed profit.Split The Bill CalculatorDivide a bill between any number of people, with tip and an optional extra share.Tax Refund CalculatorCompare what was withheld from your pay against what you actually owe.Tip CalculatorWork out a tip on the pre-tax amount, then split the total between diners.Tithe CalculatorCalculate a tithe or regular giving amount from gross or net income.Unit Price Comparison CalculatorCompare two package sizes on price per unit to see which is genuinely cheaper.VAT CalculatorAdd VAT to a net price or extract the VAT already inside a gross figure.Zakat CalculatorTotal your zakatable assets, compare against nisab, and calculate the amount due.

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