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Accountants Invoice Total (Monthly) Calculator

Calculate a monthly accounting invoice total from your retainer, additional work, expenses, discount and VAT rate.

Your Details

Overview

This Accountants Invoice Total (Monthly) Calculator estimates a client’s monthly invoice using a fixed retainer, any additional billable hours, rechargeable expenses, a discount and the applicable VAT rate.

How it works

The calculator first adds the monthly retainer, the charge for additional hours and rechargeable expenses. It deducts the selected percentage discount from that subtotal, then calculates VAT on the remaining net amount. Adding VAT to the net amount produces the estimated total invoice value.

How to use this calculator

  1. 1Enter the agreed monthly retainer fee before VAT.
  2. 2Add the number of billable hours completed outside the retainer.
  3. 3Enter the hourly rate for that additional work.
  4. 4Include any approved expenses that will be recharged to the client.
  5. 5Apply a discount and enter the VAT rate, then review the invoice total.

Example Calculation

Monthly retainer fee

$500

Additional billable hours

2

Additional work hourly rate

$100

Rechargeable expenses

$50

Discount

0%

VAT rate

20%

Total invoice amount

$900.00

A 500 monthly retainer, 200 of additional work and 50 of expenses produces a net total of 750. At 20% VAT, the invoice total is 900.

Frequently asked questions

What is included in the monthly invoice total?

The total includes the fixed retainer, charges for additional billable time, rechargeable expenses, any discount and VAT at the rate you enter.

Should the monthly retainer include VAT?

Enter the retainer excluding VAT. The calculator adds VAT separately using the VAT rate entered.

How are additional billable hours calculated?

Additional hours are multiplied by the hourly rate. That charge is added to the retainer and expenses before discounts and VAT.

Is the discount applied before or after VAT?

This calculator applies the discount before VAT, so VAT is calculated on the discounted net amount.

Can I include client expenses in the invoice?

Yes. Enter approved rechargeable expenses as a single total. Check whether each expense should have VAT applied under the relevant rules.

Does this calculator handle different VAT rates for separate items?

No. It uses one VAT rate for the entire discounted net invoice. Calculate separate invoice lines where different tax treatments apply.

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Assumptions and warnings

Assumptions

  • All entered amounts use the same currency.
  • Additional work is billed at one hourly rate for the month.
  • The discount is applied to the subtotal before VAT.
  • VAT is calculated on the discounted net invoice total.
  • This calculation is an estimate and does not account for invoice-specific tax treatment or rounding rules.

Warnings

  • This calculator provides an estimate only and is not tax, accounting or financial advice.
  • Check applicable VAT rules, expense treatment and invoice rounding requirements before issuing an invoice.
Accountants Invoice Total (Monthly) Calculator