Finding the price before tax for contractors: a practical guide
Finding the price before tax explained for contractors, with a worked example, a checklist and the mistakes to avoid.
Why this matters for contractors
Contractors often have uneven income and expenses, which makes estimating tax in advance especially useful.
Worked example
Here is the calculation with sample figures. Change any number in the Price Before Tax Calculator to run your own.
| Price incl. tax | 165.00 |
| Tax rate (%) | 10% |
| Price | 150.00 |
|---|---|
| Tax | 15.00 |
Finding the price before tax: how it works
To find the pre-tax price, divide the total by 1 plus the rate as a decimal.
Subtracting the rate from the total understates the pre-tax price because the tax was calculated on the smaller number.
A second example with larger figures
Scaling the inputs up shows how the result moves. Percentages stay the same, so the tax grows in proportion to the amount it is applied to.
| Price incl. tax | 495.00 |
| Tax rate (%) | 10% |
| Price | 450.00 |
|---|---|
| Tax | 45.00 |
Using the calculator step by step
- Open the Price Before Tax Calculator.
- Enter your own figures on each numbered line.
- Set the rate to the one that applies to you. Defaults are examples, not advice.
- Read the result and the formula below it.
Key terms
- Exempt supply
- A sale that falls outside the tax entirely. No tax is charged and input tax usually cannot be reclaimed.
- Withholding
- Tax deducted at source, by an employer or payer, before the money reaches you.
- Reduced rate
- A lower rate that applies to specific categories, often essentials such as food, medicine or books.
- Deduction
- An amount subtracted from taxable income. It saves tax equal to the deduction times your marginal rate.
- Gross amount
- The amount after tax is added, which is usually what a consumer pays.
A quick checklist for contractors
- Write down the rate.
- Divide the total by 1 + rate.
- Subtract to find the tax.
Common mistakes to avoid
- Subtracting the rate percentage from the total.
- Using the wrong local rate.
Run your own numbers. The Price Before Tax Calculator updates as you type and shows the formula it uses.
Frequently asked questions
Why should contractors care about this?
Contractors often have uneven income and expenses, which makes estimating tax in advance especially useful.
What is the quickest way to calculate it?
Use the Price Before Tax Calculator: enter your figures and it shows the result and the formula.
Is this tax advice?
No. It is general information for planning. Rules differ by country and change over time, so confirm with your tax authority or a qualified adviser.
This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.