Basic glossary

Depending on the size:

Article 4

Threshold amounts

This Directive shall apply to procurements with a value net of value-added tax (VAT) estimated to be equal to or greater than the following thresholds:

(a)  ►M2  EUR 5 548 000  ◄ for public works contracts;

(b)  ►M2  EUR 144 000  ◄ for public supply and service contracts awarded by central government authorities and design contests organised by such authorities; where public supply contracts are awarded by contracting authorities operating in the field of defence, that threshold shall apply only to contracts concerning products covered by Annex III;

(c)  ►M2  EUR 221 000  ◄ for public supply and service contracts awarded by sub-central contracting authorities and design contests organised by such authorities; that threshold shall also apply to public supply contracts awarded by central government authorities that operate in the field of defence, where those contracts involve products not covered by Annex III;

(d) EUR 750 000 for public service contracts for social and other specific services listed in Annex XIV.

https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02014L0024-20180101

Depending the procedure (for all except for minor contracts):