Portuguese NISS (social security number) for UK movers

Not every British mover needs a NISS. Those who do:

• Anyone starting paid employment in Portugal — your employer requires NISS to register you on the payroll system
• Anyone going freelance (recibos verdes) — you register as a self-employed worker at the Segurança Social
• Anyone seeking social benefits — unemployment support, sick pay, maternity/paternity, family allowances
• Anyone accruing Portuguese state pension contributions

Those who typically don't need NISS:

• UK state pensioners on S1 — your healthcare access is via the S1 mechanism, not NISS
• D7 retirees living off passive income (pensions, dividends, rentals) — no contributions needed
• Non-resident property owners — no Portuguese social security relationship

If you're on a D7 with passive income only, NISS is optional. If you're on a D8 with remote employment or freelance income, NISS is mandatory.

Two routes:

Online via Segurança Social Direta

The Segurança Social Direta portal (seg-social.pt) allows online NISS application for residents with Portuguese ID and certain other categories. British movers with AIMA residence cards and Cartão de Cidadão (where applicable) can use this route. Documentation upload includes passport, AIMA card, NIF, proof of address.

In-person at Segurança Social office

More common for British movers in 2026 because the AIMA-permit backlog means many applicants don't yet have a final card. In person you can typically proceed with the AIMA receipt (proof of pending application) and the Segurança Social will issue NISS regardless. Documentation:

• Passport
• NIF
• AIMA residence permit OR AIMA application receipt
• Proof of address (utility bill or lease)
• Birth certificate (apostilled UK original or Portuguese translation)
• If employed: employer's declaration; if self-employed: declaração de início de atividade from Finanças

Booking an appointment online is strongly advised — walk-in queues at busy Segurança Social offices in Greater Lisbon can run 2-4 hours.

If you're becoming a freelancer (self-employed worker / trabalhador independente), NISS is paired with a Finanças-issued declaração de início de atividade. Together these open you as a recibos verdes worker.

Recibos verdes contributions:

• First 12 months: exemption — no Segurança Social contributions due, only IRS prepayments (Modelo 3)
• From month 13: 21.4% of 70% of your gross invoiced income, capped and floored at specific brackets. Monthly contributions typically run €25-€480 depending on your income level
• Annual review: contributions reconciled against actual income; adjusted up or down

IRS on freelance income: 13%-48% progressive rates on net taxable income (after deductions). IFICI (NHR 2.0) at a flat 20% applies if your activity qualifies — see the IRS Jovem page for the under-35 alternative.

IVA (VAT): the threshold for IVA registration in 2026 is €15,000 of annual turnover. Below that, recibos verdes workers are IVA-exempt under the regime de isenção. Above it, you charge IVA at the standard 23% rate (with reduced rates for some categories).

If you're taking employment with a Portuguese employer, the registration process is partly handled by them:

1. You provide your NIF and AIMA documentation to the employer's HR or payroll team
2. The employer registers you with the Segurança Social as a new employee — this triggers NISS issuance if you don't already have one
3. You complete a separate NISS application via the portal or office if needed
4. Employer deducts Segurança Social contributions from your gross salary — 11% employee side, 23.75% employer side

Employee contributions cover sickness, maternity/paternity, unemployment, state pension accrual. The 11% rate is materially lower than UK NIC (12% basic + Class 2 for some).

The 2019 EU Withdrawal Agreement and the underlying Convention on Social Security between the UK and Portugal provide for totalisation — years contributed in one country count toward eligibility (but not amount) in the other.

Practically:

• UK NIC years already accrued count toward Portuguese state pension eligibility — useful if you become Portuguese resident with under 15 Portuguese years
• Portuguese contributions count toward UK state pension eligibility under the same logic
• The actual pension amount paid by each country is based on contributions in that country only — Portugal pays you for your Portuguese years, UK pays for your UK years, separately
• UK state pension is exportable abroad — paid into a Portuguese bank account in EUR or kept in UK GBP — your choice

You don't need to do anything special for totalisation to apply — it's automatic when you claim state pension from either country with cross-border contributions on record. The DWP and the Portuguese Centro Nacional de Pensões coordinate behind the scenes.