SD Worx: payroll provider facts

Who it is

The approved payroll provider is SD Worx Sociaal Secretariaat VZW (enterprise number 0407.139.583), Brouwersvliet 2 in Antwerp. The Crossroads Bank for Enterprises lists SD Worx vzw or SD vzw as its abbreviation. Under the general terms, the non-profit also invoices the services of SD Worx People Solutions NV.

SD Worx was founded in Antwerp in 1945 as Sociale Dienst; according to the Crossroads Bank for Enterprises the non-profit has existed since 22 October 1946.

Sources: KBO Public Search, SD Worx Sociaal Secretariaat VZW (0407.139.583) (checked on 11 November 2026); SD Worx, algemene voorwaarden erkend sociaal secretariaat, versie v202511 (PDF) (checked on 11 November 2026); SD Worx, over SD Worx (oprichting en kantoren) (checked on 11 November 2026)

Approval

SD Worx is on the list of approved payroll providers for employers published in the Belgian Official Gazette on 15 July 2025 (situation on 20 June 2025), under number 640, as SD VZW, Brouwersvliet 2, Antwerpen.

Under the royal decree of 28 November 1969 an approved payroll provider is a non-profit that must state its approval number on every document it issues. Your payslip from SD Worx should therefore carry number 640.

Sources: FOD Sociale Zekerheid, lijst van de erkende sociale secretariaten van werkgevers op 20 juni 2025 (Belgisch Staatsblad 15 juli 2025) (checked on 11 November 2026); Koninklijk besluit van 28 november 1969, art. 44 tot 49 over de erkende sociale secretariaten van werkgevers (Justel) (checked on 11 November 2026)

Offices, clients and target group

SD Worx lists 33 offices in Belgium.

On its page for large organisations SD Worx mentions 92,000 Belgian clients. According to its press releases the group calculates the pay of some 6 million employees across Europe.

SD Worx organises its offer for SMEs, starters with staff, large and international organisations, bookkeepers and the self-employed, with a separate starters' service.

Sources: SD Worx, onze kantoren (checked on 11 November 2026); SD Worx, over SD Worx (oprichting en kantoren) (checked on 11 November 2026); SD Worx, wie helpen we: grote organisaties (Belgische klanten) (checked on 11 November 2026); SD Worx, persbericht met indexprognose voor PC 200 (29 oktober 2026) (checked on 11 November 2026); SD Worx, startende werkgever (startersservice) (checked on 11 November 2026)

Services in the same group

SD Worx has no business one-stop shop or social insurance fund of its own: for the self-employed it refers to its partner Xerius. We found no external prevention service or child benefit fund on sdworx.be.

Source: SD Worx, payroll voor zelfstandigen (partner Xerius) (checked on 11 November 2026)

Public pay and indexation information

SD Worx publishes a gross to net calculator, a monthly overview of the applicable index and pay adjustments per joint committee, and press releases with an indexation forecast, such as on 29 October 2026.

Sources: SD Worx, bruto-netto-calculator (checked on 11 November 2026); SD Worx, simulatietools: index en loon per paritair comité (checked on 11 November 2026); SD Worx, persbericht met indexprognose voor PC 200 (29 oktober 2026) (checked on 11 November 2026)

Price and termination

SD Worx publishes no price for its payroll service. The general terms refer to recurring management fees, without an amount.

Under the general terms (version November 2025) the contract runs for three calendar years and is then tacitly renewed for one year at a time. You terminate by registered letter sent no later than 30 June; the contract then ends on 31 December. If you do not respect the six months' notice, you owe compensation.

Source: SD Worx, algemene voorwaarden erkend sociaal secretariaat, versie v202511 (PDF) (checked on 11 November 2026)

Comparing with other payroll providers

On the comparison page SD Worx sits next to seven other approved payroll providers, in alphabetical order and with the same data: approval number, offices, own client figures, target group and services in the group. There is no ranking and no rating.

Source: FOD Sociale Zekerheid, lijst van de erkende sociale secretariaten van werkgevers op 20 juni 2025 (Belgisch Staatsblad 15 juli 2025) (checked on 11 November 2026)