File your quarterly VAT return with haddock

📍 What do I need to file in the quarterly return?

📍 How often do I need to file the quarterly return?

📍 What is form 303?

📍 What are the differences between input VAT and output VAT?

📍 What VAT is reported in form 303?

📍 How do I calculate input VAT with haddock?

📍 How do I calculate output VAT?

📍 Practical example

The quarterly VAT return is the settlement of the Value Added Tax applied to services and products. Every professional or company that carries out an activity subject to VAT must file the return 4 times a year using form 303.

📄 What do I need to file in the quarterly return?

Form 303 with the breakdown of output and input VAT for the previous quarter is the main document that must be filed in the quarterly VAT return.

If you invoice international clients within the EU, you must also report intra-community VAT using form 349 (generally quarterly, although it can be monthly depending on turnover).

📆 How often do I need to file the quarterly return?

• January, February, and March (quarter 1): the self-assessment must be filed between April 1 and April 22. The deadline to set up direct debit so the tax office can automatically charge the self-employed person's bank account ends on April 17.
• April, May, and June (quarter 2): the self-assessment must be filed between July 1 and July 22. The deadline to set up direct debit so the tax office can automatically charge the self-employed person's bank account ends on July 17.
• July, August, and September (quarter 3): the self-assessment must be filed between October 1 and October 22. The deadline to set up direct debit so the tax office can automatically charge the self-employed person's bank account ends on October 17.
• October, November, and December (quarter 4): the self-assessment must be filed between January 1 and January 30 of the following year.

📄 What is form 303?

Form 303 is the tax form used to settle Value Added Tax (VAT).

Companies and professionals play a collection role for the public treasury.

Form 303 is where the difference between VAT collected and VAT paid is calculated, which results in a balance due, offset, or refund.

❓What are the differences between input VAT and output VAT?

Input VAT

Input VAT includes all VAT payments made by the self-employed person or company in relation to the products or services required to carry out their business activity.

Output VAT

Output VAT refers to the amount of VAT applied when selling an item or providing a service.

In other words, it is the VAT the customer pays when receiving the invoice, and then it is passed on to the supplier. Although this amount is collected by the self-employed person or company, it is not part of their income, but rather must be remitted to the tax office as part of the quarterly VAT return.

👀 What VAT is reported in form 303?

Calculating the VAT settlement is very simple:

Total VAT = Output VAT - Input VAT

Therefore, it is essential to calculate the VAT collected and the VAT paid during the quarter accurately in order to complete VAT form 303 correctly.

➕ How do I calculate input VAT with haddock?

1. Go to the Documents module and select the last quarter in the date filter.

2. Select all documents and click the Export button in the top-right corner.

3. Select the Summary and Totals format, where you can export an Excel or CSV file with the document register.

4. In the document register you will find the VAT breakdown you need to file with the tax office.

In this document you will find:

Taxable base: The amount on which the tax is calculated.

VAT: Value Added Tax applied.

VAT amount: The result of multiplying the taxable base by the assigned VAT rate.

RE (Equivalence surcharge): Equivalence surcharge is a special VAT scheme in Spain for retailers. Under this scheme, the tax is applied directly to the profit margin on the sale of taxed products, and is borne by the end consumer. Retailers do not file VAT returns or settle the tax separately.

➕ How do I calculate output VAT?

You will not be able to extract output VAT directly from haddock because we cannot group your sales invoices by VAT charged.

Even so, we recommend that if you want to see sales with or without VAT, go to User settings > Preferences > Dashboard, and there configure whether you want to see charts and amounts with or without VAT. This way your preferences will affect the Sales module and the Dashboard.

In most cases, you can obtain the VAT from your sales by applying 10% of the total, unless your activity falls under other cases such as a liquor warehouse or a catering service, where the applicable rate is 21%.

🍕 Practical example

Quarter 1

• Turnover of 12,000€ taxable base for your activity
• Expenses of 100€ (excluding VAT) for the purchase of the haddock subscription

Output VAT (10% in hospitality)

12,000*10% = 1,200€

Input VAT (21%, standard VAT)

100*21% = 21€

VAT to file

1,200€-21€ = 1,179€ positive.

1,179€ to pay to the tax authority, since output VAT is higher than input VAT.

Updated on: 23/04/2026