VAT calculator for Ireland

Add VAT to a price, or take it out of a total.

The calculator takes 23%, 13.5%, 9% or 0%. Each figure is rounded to the nearest cent, and a half cent rounds up.

Work out
VAT rate
VAT
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Total with VAT
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Worked out on this page. Nothing you type is sent or kept.

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What the calculator works out

The calculator works one of two ways. “VAT to add” takes an amount before VAT and gives the VAT and the total with VAT. “VAT inside a total” takes a total that includes VAT and gives the amount before VAT and the VAT in it.

An amount can have commas and up to two decimal places.

How each figure is worked out

VAT is charged on the price before VAT. “VAT to add” multiplies the amount by the rate, rounds the VAT to the cent and adds it on.

“VAT inside a total” divides the total by one plus the rate: by 1.23 at 23%, 1.135 at 13.5% and 1.09 at 9%. The amount before VAT is rounded to the cent and the VAT is the rest, so the two always add up to the total.

  • €2,847 before VAT at 13.5%: the VAT is €384.345, which rounds up to €384.35. The total is €3,231.35.
  • €1,000 including VAT at 23%: 1,000 divided by 1.23 is 813.008 to three places, so the amount before VAT is €813.01 and the VAT is €186.99.
  • €12,000 including VAT at 9%: €11,009.17 before VAT and €990.83 of VAT.

The same arithmetic on a quote or an invoice

A business registered for VAT starts with the calculator’s four rates, in Settings under Tax: a Standard rate of 23%, a Reduced rate of 13.5%, a Second reduced rate of 9% and a Zero rate of 0%.

On a quote or an invoice that charges VAT, the VAT on the Part of the supply lines is worked out once, on their total, and rounded as “VAT to add” rounds it. A line set to Separate, standard rate, Separate, reduced rate or Zero rated is charged 23%, 13.5% or 0%, worked out on that line alone.

A price list that includes VAT

A price list can come in through Import, in Settings, with a Price, including VAT column. Each price has the VAT taken off at the rate its row names, or else at the rate chosen in VAT the prices include.

The price before VAT is rounded exactly as “VAT inside a total” rounds it, and How the file was read counts those rows as Prices with VAT taken off. A business not registered for VAT keeps the prices as written.

Questions, answered.

Why is the VAT in a total not 23% of the total?
A total of €123 holds €100 before VAT and €23 of VAT. So the VAT is 23/123 of any total at that rate. That is about 18.7% of the total, against 11.9% at 13.5% and 8.3% at 9%.
Which VAT rate does building work in Ireland take?
The calculator does not choose it. The rate follows what is supplied. Building work is at 13.5%, or at the goods’ rate, usually 23%, where the goods cost more than two thirds of the price before VAT. Solar panels supplied and installed on a private home have been at 0% since 1 May 2023. A heat pump supplied and installed has been at 9% since 1 January 2025, and a quote or an invoice for one can go out at 9%.
Why can taking VAT out and adding it back miss by a cent?
€80 including VAT at 13.5% is €70.48 before VAT and €9.52 of VAT. Adding 13.5% to €70.48 gives €9.51 of VAT and a total of €79.99. Each figure is rounded to the cent, so a round trip can end a cent away.
Can a price be typed including VAT?
No. The price is typed before VAT in Unit price, ex VAT on a quote line, Unit price ex VAT on an invoice line and Sold at, ex VAT for a part in the price book. The VAT is then added on the quote or invoice.
Does the office work out VAT under the reverse charge?
Not on the invoice. Under the reverse charge, a registered business’s invoice for work in Ireland to a customer whose Customer type is Principal contractor charges no VAT and prints no rate and no VAT figure. It prints “VAT on this supply to be accounted for by the Principal Contractor.” The principal contractor works the VAT out at the rate the work takes, which is the figure “VAT to add” gives.

Read next.

Irish VAT

23%, 13.5%, 9% and 0% set up at signup, and the two-thirds rule worked out from cost.

Two-thirds rule calculator

Whether the goods put a job at 23% or leave it at 13.5%, with the VAT to the cent.

RCT calculator

The RCT a principal deducts at 0%, 20% or 35%, and what you are paid, to the cent.

Invoices and getting paid

Invoices emailed with the PDF, paid by card or transfer, and chased by email when late.

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