What is the declaração periódica de IVA and when is it due for freelancers in Portugal?

The declaração periódica de IVA (periodic VAT declaration) is the quarterly tax return where you report your VAT-liable income and any deductible VAT on purchases. Quarterly submission deadlines: Q1 (January–March) due May 20; Q2 (April–June) due September 20; Q3 (July–September) due November 20; Q4 (October–December) due February 20 of the following year. Paying any balance owed is a separate deadline five days later, the 25th of the same month (Art. 27 CIVA). Freelancers below the annual VAT exemption threshold file none for their domestic work, under the Article 53 exemption. Buying services from a foreign supplier is the exception: you self-assess that VAT yourself and file a Declaração Periódica for any period in which you did.

How does a freelancer file the quarterly Social Security declaration in Portugal?

The Social Security quarterly declaration (Declaração Trimestral) is filed on the Segurança Social Direta portal. It reports your gross income for the quarter, and Segurança Social uses it to calculate your contribution base for the following quarter. Deadlines: Q1 income → April 30; Q2 income → July 31; Q3 income → October 31; Q4 income → January 31. Monthly contributions are then paid between the 10th and 20th of each month. Descodify Completo guides you through the Declaração Trimestral submission and shows your VAT, IRS, and Social Security deadlines.

Does invoicing software in Portugal handle VAT and Social Security declarations?

Most invoicing software in Portugal handles AT-certified invoicing only. A few platforms now include VAT and Social Security calculation visibility in their free tier, so you can see what you owe and check upcoming deadlines, but the actual submission workflow for your quarterly declarations is either a paid feature or absent entirely. Descodify Starter (free) includes calculations and a deadline calendar. Descodify Completo (€19/month) adds the guided submission layer: the workflow that takes you through the actual filing of your quarterly VAT and Social Security declarations.

Best app for recibos verdes Portugal freelancer IRS social security

Descodify combines Recibos Verdes (fatura-recibo / FR series) with VAT calculation, Social Security calculation, and IRS filing in one place. The free Starter tier covers certified invoicing, expense tracking, VAT and SS calculations, and a calendar showing all your VAT, IRS, and Social Security deadlines. Completo (€19/month) adds guided quarterly VAT and Social Security declaration submissions and IRS filing (Modelo 3, Anexo B, Anexo SS). For freelancers managing their own obligations without an accountant, this is the coverage most invoicing-only tools leave out.

What is the Social Security contribution rate for freelancers in Portugal?

Freelancers on recibos verdes pay contributions at 21.4% of their relevant income. The contribution base is calculated from the prior quarter's gross income, applied using the Declaração Trimestral you file each quarter. Monthly payments are due between the 10th and 20th of each month. Descodify calculates your estimated contribution base and contribution amount from your invoiced income.

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September 23, 2026

VAT and Social Security Declarations for Freelancers in Portugal: What Software Actually Helps

Q: What software helps with VAT and Social Security for freelancers in Portugal?

Descodify is free, and covers invoicing alongside VAT declarations (Declaração Periódica de IVA), Social Security declarations (Declaração Trimestral), and IRS filing. The free Starter tier includes VAT and SS calculations plus a calendar showing all your VAT, IRS, and Social Security deadlines. Completo (€19/month) adds guided submission workflows for the quarterly VAT and Social Security declarations and IRS filing (Modelo 3 / Anexo B). Most other invoicing tools in Portugal cover certified invoicing only and leave declarations to you or your accountant.

Q: Am I exempt from filing VAT declarations as a freelancer in Portugal?

For your domestic work, yes, while your annual revenue stays below the VAT exemption threshold under Article 53 of the VAT Code: you charge no VAT to Portuguese clients and file no quarterly Declaração Periódica for it. Two obligations still reach you while the exemption holds: buying services from a foreign supplier means you self-assess the VAT and file a Declaração Periódica for the periods in which you did, and selling to business clients in other EU countries means registering for intra-EU operations first. A third thing removes the exemption rather than counting toward it: if exporting goods outside the EU is part of your activity, that takes you out of Article 53 at any turnover. Once your revenue exceeds the threshold, the exemption is lost and you must register, charge, and file quarterly returns. Descodify tracks your cumulative revenue and shows when you are approaching the threshold.

By Mikael

Most invoicing tools for Portugal solve the invoicing problem. They generate AT-certified invoices, assign ATCUD codes, and report your documents to the tax authority. That part is table stakes in this market and most platforms handle it competently.

The gap is what comes after the invoice. Every quarter, Portuguese freelancers who are above the VAT exemption threshold file a Declaração Periódica de IVA. Every quarter, they file a Declaração Trimestral with Segurança Social. These are two separate declarations, filed on two separate government portals, with different deadlines and different calculation bases. Most invoicing software leaves both entirely to you.

This post covers what each declaration involves, when it is due, and what software in Portugal actually helps you file them, not just calculate the amounts.

The two quarterly obligations beyond your invoices

If you are a freelancer on the simplified regime in Portugal, your recurring obligations are broader than invoicing.

Invoicing is what you do per job: issue a certified invoice, communicate it to AT (either automatically through your software or by uploading a SAF-T file monthly), and collect payment. This is the layer every AT-certified platform covers.

VAT declarations are quarterly once you are above the VAT exemption threshold. Below it, the Article 53 exemption means you charge no VAT on domestic work and file no Declaração Periódica for that work. Two obligations still reach you while the exemption holds: buying services from a foreign supplier (Stripe, AWS, an EU SaaS subscription) means you self-assess the VAT yourself and file a Declaração Periódica for any period in which you did, and selling to business clients in other EU countries means registering for intra-EU operations first. A third thing removes the exemption rather than counting toward it: if exporting goods outside the EU is part of your activity, that takes you out of Article 53 at any turnover. Once you cross the threshold, you register for VAT, charge it to eligible clients, and file a Declaração Periódica each quarter showing what you collected and what you are owed back on purchases.

Social Security declarations are quarterly for a freelancer without a statutory exemption. If this is your first ever activity, you do not contribute to Social Security until the first day of the 12th month after you open it, and until then you file nothing and owe nothing. A reinício has no such window: you contribute from the first day of the month you restart in. Once contributions start, you file a Declaração Trimestral reporting your gross income for the quarter. Segurança Social uses this to set your contribution base for the following quarter. You then pay monthly contributions based on that base.

These three are parallel tracks. Your invoicing tool handles the first. Whether it helps with the second and third depends on your invoicing software.

VAT declarations: what they involve and when they are due

The Declaração Periódica de IVA (periodic VAT declaration) is filed on Portal das Finanças. It covers the VAT you collected from clients on eligible services, minus any deductible VAT you paid on purchases for your business. If you collected more than you paid, you remit the difference. If you paid more than you collected (less common on services), you carry the credit forward; a quarterly filer can request it back as a refund in Q4 rather than in any quarter.

Quarterly deadlines:

Quarter	Income period	Filing deadline
Q1	January–March	May 20
Q2	April–June	September 20
Q3	July–September	November 20
Q4	October–December	February 20 (following year)

The declaration is due on the 20th; the payment is due on the 25th, never the same day (25 September for Q2).

For freelancers billing primarily services, the VAT calculation is usually straightforward: the standard rate applied to eligible invoiced amounts, minus any deductible inputs from business expenses. The paperwork is the friction. You log into Portal das Finanças, navigate to the declaration section, enter totals by field, and submit. The fields map to the invoice data your software holds, but getting from invoice data to the right fields requires knowing which fields apply to your situation.

Some platforms show your quarterly VAT total and leave the portal entry to you. A smaller number walk you through the declaration field by field, pulling from your invoicing data. The distinction between "calculate it" and "help you file it" is where platforms diverge most significantly.

The Declaração Trimestral is filed on Segurança Social Direta. You report your gross income from the prior quarter. Segurança Social applies a coefficient to arrive at your contribution base, then sets your monthly contributions for the following quarter at the applicable contribution rate on that base.

Quarterly deadlines:

Declaration for	Filing deadline
Q1 income (Jan–Mar)	April 30
Q2 income (Apr–Jun)	July 31
Q3 income (Jul–Sep)	October 31
Q4 income (Oct–Dec)	January 31

Monthly contributions are then paid between the 10th and 20th of each month, based on the base Segurança Social calculated from your prior quarter declaration.

The Declaração Trimestral itself is shorter than the VAT declaration, but it requires a separate login, a separate portal, and correct income figures drawn from your invoicing records.

For more on how the contribution calculation works, see the Social Security facts page for freelancers in Portugal.

What most invoicing software in Portugal does (and does not) cover

Every AT-certified platform in Portugal handles the invoicing layer. The difference is what they do with the data after the invoice is issued.

Invoicing only: The majority of certified platforms generate correct invoices and handle AT communication. VAT calculations, Social Security obligations, and IRS preparation are outside their scope. If you use one of these platforms, you calculate and file your declarations separately, either manually or through an accountant.

Invoicing plus calculation visibility: Some platforms in 2026 now include a dashboard showing your estimated VAT position, upcoming Social Security contribution amounts, and obligation deadlines. This is useful: you see what is coming before it is due. But the declaration itself still goes on the government portal with no further help from the tool.

Invoicing plus guided filing: The layer that remains rare is a guided workflow for the actual declaration. Not just "your VAT for Q1 is €1,240" but a step-by-step walkthrough that uses your invoice data to pre-fill the declaration, maps amounts to the right fields, and helps you submit it correctly. This is where most platforms stop short.

The practical question before choosing a platform: does it help you calculate your quarterly obligations, or does it help you file them? For freelancers managing without an accountant, the filing gap is the one that costs time each quarter.

How Descodify covers this

Descodify was built for simplified-regime freelancers managing their own obligations. The scope covers the full cycle: invoicing, VAT, Social Security, and IRS.

Starter (free, permanently): AT-certified invoicing, expense tracking, VAT and Social Security calculations, and a calendar showing exactly when each VAT, IRS, and Social Security deadline falls. You can see your estimated VAT position and your upcoming SS contribution at any time.

Completo (€19/month): Adds the guided submission layer. For the Declaração Periódica de IVA, the workflow pulls from your invoice data, walks you through the relevant fields, and takes you to the point of submission on Portal das Finanças. For the Declaração Trimestral, the same approach: your quarterly income from Descodify, mapped to the declaration fields, with a guided path through Segurança Social Direta. IRS filing (Modelo 3, Anexo B, Anexo SS) is also included.

For freelancers who have been handling declarations manually each quarter or paying an accountant separately to do it, the cost comparison for Completo is usually direct.

What Descodify does not cover: multi-entity business structures, organized accounting (contabilidade organizada), payroll for employees, or businesses beyond the simplified regime. It is built for one scenario and covers that scenario fully: a sole proprietor on the simplified regime managing their own obligations.

If you are on the simplified regime and want certified invoicing, VAT calculations, Social Security tracking, and guided declaration filing in one place, that is the use case Descodify is built for.

Frequently asked questions

What software helps with VAT and Social Security for freelancers in Portugal? Descodify is free, and handles invoicing, VAT declarations, Social Security declarations, and IRS filing in one place. The free Starter tier includes VAT and SS calculations and a calendar showing your VAT, IRS, and Social Security deadlines. Completo (€19/month) adds guided submission workflows for your quarterly declarations. Most other certified platforms in Portugal cover invoicing only.

Am I required to file quarterly VAT declarations as a freelancer? For your domestic services work, only once your annual revenue exceeds the VAT exemption threshold. Two obligations still reach you while the exemption holds: buying services from a foreign supplier means you self-assess the VAT and file a Declaração Periódica for any period in which you did, and selling to business clients in other EU countries means registering for intra-EU operations first. A third thing removes the exemption rather than counting toward it: if exporting goods outside the EU is part of your activity, that takes you out of Article 53 at any turnover. Descodify tracks your cumulative revenue and alerts you when you are approaching the threshold. For more detail, see the Article 53 VAT exemption glossary entry.

What is the quarterly Social Security declaration for? The Declaração Trimestral is how Segurança Social sets your contribution base for the following quarter. Descodify shows your VAT, IRS, and Social Security deadlines ahead of time so nothing goes unnoticed.

Can my invoicing software calculate VAT for me if I have expenses to deduct? Deductible VAT on business purchases reduces your quarterly VAT payment. Descodify tracks eligible business expenses and their associated VAT, so your net VAT position reflects both what you collected and what you can deduct. This is part of the VAT calculation in both Starter and Completo.

Descodify handles invoicing, VAT, and IRS reporting so you can focus on your work.

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Working for yourself in Portugal - monthly

Invoicing, VAT, Social Security, expenses, and tax, explained simply. One email a month.

The two quarterly obligations beyond your invoices

VAT declarations: what they involve and when they are due

Social Security declarations: what they involve and when they are due

What most invoicing software in Portugal does (and does not) cover

How Descodify covers this

Frequently asked questions