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Expenses & tax planning

VAT & tax calculator

Add or remove VAT with a clear breakdown, or use the original revenue set-aside model for a simple budget scenario.

Free to useNo sign-up neededEditable example figures
01 / Your figures

Make it your estimate

Start with our example. Replace the figures with your own.

A budgeting scenario, not a VAT calculation. Choose Add or Remove VAT for VAT arithmetic.

Use the same period for revenue and expenses. This amount is the starting revenue for the set-aside model.
£
The share of starting revenue you want to set aside. This is not VAT extraction or a VAT-return calculation.
%
A single rate chosen by you for budgeting. The 18% example is not an official income tax or corporation tax rate.
%
Reduces the amount used for the illustrative tax estimate. The headline result is before payment of these expenses.
£
Results update as you type.
02 / Your estimate

Revenue after set-asides

£36,812.00

Before paying the expenses entered. This is not take-home profit.

Here’s the breakdown

Starting revenue
£52,000.00
Revenue set-aside
-£10,400.00
Revenue after first set-aside
£41,600.00
Expenses used in tax estimate
£15,000.00
Amount used for tax estimate
£26,600.00
Illustrative tax set-aside
-£4,788.00
Balance after expenses
£21,812.00

Planning mode: a percentage set-aside, not a VAT bill. The headline balance is before expenses are paid.

Figures are rounded for display. Calculations use unrounded values.

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Understand your estimate

How the calculation works

Set-aside = revenue × set-aside rate. Illustrative tax = max(revenue − set-aside − expenses, 0) × tax rate. Remaining revenue = revenue − both set-asides.

A worked example

For VAT arithmetic, adding 20% to £100 gives £120, including £20 VAT. Removing 20% VAT from £120 gives £100 net and £20 VAT.

What to allow for

  • The default planning mode preserves the original arithmetic. Setting aside 20% of revenue is not the same as removing 20% VAT from an inclusive price.
  • Add VAT uses net amount × (1 + rate). Remove VAT uses gross amount ÷ (1 + rate). These modes do not estimate income tax.
  • VAT on purchases, VAT schemes, registration, agent/principal status, tax bands and reliefs are outside this calculator. Use an accountant for your actual liability.

Check the official guidance

GOV.UK VAT ratesGOV.UK VAT calculations

Useful questions

Which mode should I use?

Use Add VAT for a price that excludes VAT, and Remove VAT for one that includes VAT. Use Revenue set-aside only to reproduce the original budgeting scenario.

Does the planning result include expenses?

The headline is before expenses are paid. The breakdown also shows the balance after those expenses so the two figures are not confused.