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X-ROAD INSIGHTS · EMTA
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EMTA · Tax workflow & returns cluster · Dec 2025 – May 2026

About 603,000 calls per day — tax returns and case handling.

Payroll and social tax return (tsd), the case/workflow engine (impulss) and further EMTA domain services (nap, hampi, ttki) — the largest cluster. Individual subsystem meanings are inferred and flagged.

Requests / day
603k
49.5 % of all PPA calls
Services in the cluster
114
endpoints across several EMTA subsystems
Avg. latency
432 ms
across all services

Top consumers

The largest users of this cluster with their use case. Click a row for details. Below: the subsystems and the full consumer list.

#TopicMemberClassAvg / day

Grouped subsystems

This cluster groups 15 PPA subsystems. Descriptions from RIHA; where no RIHA entry exists, inferred from the code (flagged).

SubsystemDescriptionAvg / day
impulssEMTA workflow/case-handling service. (inferred)265,853
tsdIncome and social tax declaration (TSD). (inferred)142,130
napEMTA domain service. (inferred)72,495
hampiEMTA domain service. (inferred)54,637
ttkiEMTA domain service. (inferred)48,334
personsPerson-data service. (inferred)9,566
kksFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)3,417
ettevotluskontoBusiness account (ettevõtluskonto). (inferred)3,323
investment_income_reportFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)1,169
laakFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)1,127
makisFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)294
lubaFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)288
accountingFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)255
ttki-pumpFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)192
nap-clientFurther/auxiliary EMTA subsystem (low volume; label inferred). (inferred)192

All consumers

Complete list of all 158 organisations using tax workflow/return services — sorted by requests per day.

#MemberClassTop serviceAvg / dayShare

The service family

Service endpoints of the cluster (avg/day). Meaning of individual services inferred from names.

Daily load — when is the cluster used?

24-hour distribution across an average day.

Low  
  High

Key facts

The three findings from the dataset that stand out most for this cluster.