Accountants Invoice Total (Daily) Formula
Learn how to calculate an accountant's daily invoice total from time charges, expenses, discounts, and sales tax or VAT.
A daily accountant invoice total starts with billable time, adds reimbursable expenses, applies any agreed discount, and then adds sales tax or VAT. Separating these stages helps show the client-facing total as well as the amount due before tax.
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Daily invoice total
Where:
Multiply billable hours by the hourly rate, add eligible expenses, reduce the result by the discount, then add sales tax or VAT to the discounted subtotal.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| billableHours - Billable hours | Hours of client work being charged for the day. | hours |
| hourlyRate - Hourly rate | Agreed charge for each billable hour. | currency |
| reimbursableExpenses - Reimbursable expenses | Eligible client expenses included on the invoice before discount and tax. | currency |
| discountRate - Discount rate | Percentage reduction applied to the pre-discount subtotal. | percent |
| salesTaxRate - Sales tax or VAT rate | Percentage tax applied to the discounted subtotal. | percent |
Step-by-Step Calculation
Calculate professional fees
Multiply chargeable hours by the hourly billing rate.
professionalFees = billableHours * hourlyRate
Add reimbursable expenses
Add expenses that are being passed on to the client.
preDiscountSubtotal = professionalFees + reimbursableExpenses
Calculate the discount
Convert the percentage discount to a decimal and apply it to the pre-discount subtotal.
discountAmount = preDiscountSubtotal * (discountRate / 100)
Find the subtotal before tax
This is the amount due after the discount and before sales tax or VAT.
invoiceSubtotal = preDiscountSubtotal - discountAmount
Calculate sales tax or VAT
Apply the entered tax rate to the discounted subtotal.
taxAmount = invoiceSubtotal * (salesTaxRate / 100)
Calculate the total payable
Add tax to the before-tax subtotal to get the estimated daily invoice total.
invoiceTotal = invoiceSubtotal + taxAmount
Daily invoice with expenses and a discount
Professional fees
7.5 × $120.00
$900.00
Pre-discount subtotal
$900.00 + $45.00
$945.00
Discount amount
$945.00 × 10%
$94.50
Subtotal before tax
$945.00 − $94.50
$850.50
Sales tax or VAT
$850.50 × 20%
$170.10
Daily invoice total
$850.50 + $170.10
$1,020.60
Final Result
Estimated daily invoice total: $1,020.60, including $170.10 in sales tax or VAT.
Assumptions
- ✓All billable hours use one hourly rate for the day.
- ✓Reimbursable expenses are added before the discount is calculated.
- ✓The entered discount applies to both professional fees and reimbursable expenses.
- ✓Sales tax or VAT is applied to the discounted subtotal.
- ✓All amounts use the same currency.
Limitations
- !Tax treatment of expenses, discounts, and disbursements can vary by location and invoice type.
- !The calculation does not include withholding tax, income tax, retention, deposits, or prior payments.
- !It does not account for multiple hourly rates, minimum fees, fixed-fee work, or time rounding rules.
- !The result is an estimate and should be checked against the engagement terms and applicable requirements.
Common Mistakes to Avoid
Entering total worked hours instead of only client-billable hours.
Applying a percentage discount as a currency amount or entering 10 instead of 10% where the field expects a percentage.
Including non-reimbursable internal costs as client expenses.
Adding tax to the pre-discount amount when the intended method is to tax the discounted subtotal.
Using an hourly rate that already includes tax and then adding tax again.
Mixing expenses from a different currency with the hourly billing amount.
Related Formulas
Frequently Asked Questions
What is the formula for a daily accountant invoice total?
The formula is: (billable hours × hourly rate + reimbursable expenses) × (1 − discount rate) × (1 + sales tax or VAT rate), with percentage rates converted to decimals.
How are professional fees calculated?
Professional fees equal billable hours multiplied by the agreed hourly rate.
Is the discount applied before sales tax or VAT?
This calculator deducts the discount before calculating sales tax or VAT. Actual treatment can vary, so confirm the relevant invoice rules.
Does the formula tax reimbursable expenses?
Yes. The default formula includes reimbursable expenses in the discounted subtotal used to calculate tax. This may not match every local tax treatment.
How can I calculate a fixed daily fee with this formula?
You can enter 1 billable hour and use the hourly rate as the agreed fixed fee, then add any expenses, discount, and tax as needed.
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