Sources & data

Every withholding-tax rate, treaty rate, and filing deadline this calculator uses is sourced from a public reference document. The table below is generated at build time directly from the data files the calculator reads — if a source disappears here, it disappears in the calculator at the same time.

Information tool, not tax advice.

Treaty rates

Bilateral and national-authority sources behind every withholding-tax treaty rate this calculator displays. As of 2026-05-03.

IssuerCountriesSourceAs of
Bilateral tax treatyDE, ES, FR, IT, NL, PT, US2026-05-03
AT tax authorityAT2026-05-03
BE tax authorityBE2026-05-03
CH tax authorityCH2026-05-03
DK tax authorityDK2026-05-03
FI tax authorityFI2026-05-03
IE tax authorityIE2026-05-03
LU tax authorityLU2026-05-03
NO tax authorityNO2026-05-03
PL tax authorityPL2026-05-03
SE tax authoritySE2026-05-03
GB tax authorityGB2026-05-03
CA tax authorityCA2026-05-03

Filing deadlines

Per-country deadline references the calculator uses to surface countdown reminders. As of 2026-05-03.

CountryAuthorityAs of
DEbzst.de2026-05-03
ESsede.agenciatributaria.gob.es2026-05-03
ITagenziaentrate.gov.it2026-05-03
NLbusiness.gov.nl2026-05-03
CHestv.admin.ch2026-05-03
FRimpots.gouv.fr2026-05-03
GBgov.uk2026-05-03
SEskatteverket.se2026-05-03
NOskatteetaten.no2026-05-03
FIvero.fi2026-05-03
USirs.gov2026-05-03
CAcanada.ca2026-05-03
ATbmf.gv.at2026-05-03
BEfinances.belgium.be2026-05-03
BGnra.bg2026-05-03
CYmof.gov.cy2026-05-03
CZfinancnisprava.cz2026-05-03
DKskat.dk2026-05-03
EEemta.ee2026-05-03
GRaade.gr2026-05-03
HRporezna-uprava.hr2026-05-03
HUnav.gov.hu2026-05-03
IErevenue.ie2026-05-03
LTvmi.lt2026-05-03
LUimpotsdirects.public.lu2026-05-03
LVvid.gov.lv2026-05-03
MTcfr.gov.mt2026-05-03
PLpodatki.gov.pl2026-05-03
PTportaldasfinancas.gov.pt2026-05-03
ROanaf.ro2026-05-03
SIfu.gov.si2026-05-03
SKfinancnasprava.sk2026-05-03

National withholding-rate authority citations will be surfaced here once provenance columns are added to the WHT-rates dataset (deferred to a later phase; see project changelog).

How we keep this current

Treaty and deadline references are reviewed each tax year. CI fails the build when current-year rate data is missing. If you spot an outdated citation, write to hello@taxreclaim.eu.