---
id: object/codeunit/18543-in
type: object
title: Codeunit 18543 "Calculate Tax" (IN)
summary: Codeunit 18543 "Calculate Tax" (IN) in the IN country layer (Microsoft.Finance.TaxBase). 6 public procedures, 10 events, 11 event subscribers. Introduced in BC29, still in BC30.
tier: official
language: en
tags:
  - codeunit
  - in layer
versions:
  introduced: "29"
  last_changed: null
  deprecated: null
review:
  state: derived
  by: null
  at: null
  flags: []
generated:
  at: "2026-10-11T00:31:51.816Z"
  pipeline: 0.2.0
  prompts: {}
  input_hash: 7125f8523f32ed325693cb31f18fc077492c1bc9433a3eadd32ded1d553b751c
evidence:
  - kind: code
    url: https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Apps/IN/INTaxBase/app/src/codeunit/CalculateTax.Codeunit.al
    title: src/Apps/IN/INTaxBase/app/src/codeunit/CalculateTax.Codeunit.al (releases/29.x)
    date: null
    commit: ea08af5ef2d6a9b5c5af4a029288abbe2c883220
    t: null
    quote: null
links:
  learn: []
  objects: []
  features: []
  topics: []
  localizations:
    - localization/in
  videos: []
  posts: []
  guidelines: []
  changes:
    - change/bcapps/9968
object_type: codeunit
object_id: 18543
name: Calculate Tax
namespace: Microsoft.Finance.TaxBase
app: INTaxBase
extends: null
first_version: "29"
last_version: "30"
present_in:
  - "29"
  - "30"
changed_in: []
source_major: "29"
obsolete: null
countries: []
ms_search_form_ids: []
country: IN
counts:
  fields: 0
  procedures: 28
  events: 10
  subscribers: 11
relations:
  out: 0
  referenced_by: 0
  pages: 0
  extended_by: 0
  event_subscribers: 0
---

# Codeunit 18543 "Calculate Tax" (IN)

> Codeunit 18543 "Calculate Tax" (IN) in the IN country layer (Microsoft.Finance.TaxBase). 6 public procedures, 10 events, 11 event subscribers. Introduced in BC29, still in BC30.

IN country layer · Microsoft.Finance.TaxBase · BC29-30 · [source at ea08af5e](https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Apps/IN/INTaxBase/app/src/codeunit/CalculateTax.Codeunit.al) · facts from BC29

An object of the [IN localization](../../localizations/in.md), not part of W1.

## Events published

- `OnAfterValidateGenJnlLineFields(var GenJnlLine: Record "Gen. Journal Line")` (integration)
- `OnAfterValidateSalesLineFields(var SalesLine: Record "Sales Line")` (integration)
- `OnAfterValidatePurchaseLineFields(var PurchaseLine: Record "Purchase Line")` (integration)
- `OnAfterValidateServiceLineFields(var ServiceLine: Record "Service Line")` (integration)
- `OnAfterValidateFinChargeMemoLineFields(var FinanceChargeMemoLine: Record "Finance Charge Memo Line")` (integration)
- `OnBeforeCallTaxEngineForGenJnlLine(var GenJournalLine: Record "Gen. Journal Line"; var IsHandled: Boolean)` (integration)
- `OnBeforeUpdateTaxAmountOnGenJnlLine(var GenJournalLine: Record "Gen. Journal Line"; var xGenJournalLine: Record "Gen. Journal Line"; var IsHandled: Boolean)` (integration)
- `OnBeforeCallTaxEngineForSalesLine(var SalesLine: Record "Sales Line"; var IsHandled: Boolean)` (integration)
- `OnBeforeCallTaxEngineForPurchaseLine(var PurchaseLine: Record "Purchase Line"; var IsHandled: Boolean)` (integration)
- `OnBeforeCallTaxEngineForServiceLine(var ServiceLine: Record "Service Line"; var IsHandled: Boolean)` (integration)

## Event subscriptions

- OnAddGenJnlLineUseCaseEventstoLibrary subscribes to Codeunit "Use Case Event Library" OnAddUseCaseEventstoLibrary
- HandleGenJnlLineUseCase subscribes to Codeunit "Calculate Tax" OnAfterValidateGenJnlLineFields
- OnAddSalesUseCaseEventstoLibrary subscribes to Codeunit "Use Case Event Library" OnAddUseCaseEventstoLibrary
- HandleSalesUseCase subscribes to Codeunit "Calculate Tax" OnAfterValidateSalesLineFields
- OnAddPurchaseUseCaseEventstoLibrary subscribes to Codeunit "Use Case Event Library" OnAddUseCaseEventstoLibrary
- HandlePurchaseUseCase subscribes to Codeunit "Calculate Tax" OnAfterValidatePurchaseLineFields
- OnAddServiceUseCaseEventstoLibrary subscribes to Codeunit "Use Case Event Library" OnAddUseCaseEventstoLibrary
- HandleServiceUseCase subscribes to Codeunit "Calculate Tax" OnAfterValidateServiceLineFields
- OnAddFinanceUseCaseEventstoLibrary subscribes to Codeunit "Use Case Event Library" OnAddUseCaseEventstoLibrary
- HandleFinanceChargeMemoUseCase subscribes to Codeunit "Calculate Tax" OnAfterValidateFinChargeMemoLineFields
- OnBeforePostVAT subscribes to Codeunit "Gen. Jnl.-Post Line" OnBeforePostVAT

## Procedures

- `CallTaxEngineOnGenJnlLine(var GenJournalLine: Record "Gen. Journal Line"; var xGenJournalLine: Record "Gen. Journal Line")`
- `RunOnBeforeUpdateTaxAmountOnGenJnlLine(var GenJournalLine: Record "Gen. Journal Line"; var xGenJournalLine: Record "Gen. Journal Line"; var IsHandled: Boolean)`
- `CallTaxEngineOnSalesLine(var SalesLine: Record "Sales Line"; var xSalesLine: Record "Sales Line")`
- `CallTaxEngineOnPurchaseLine(var PurchaseLine: Record "Purchase Line"; var xPurchaseLine: Record "Purchase Line")`
- `CallTaxEngineOnServiceLine(var ServiceLine: Record "Service Line"; var xServiceLine: Record "Service Line")`
- `CallTaxEngineOnFinanceChargeMemoLine(var FinanceChargeMemoLine: Record "Finance Charge Memo Line"; var xFinanceChargeMemoLine: Record "Finance Charge Memo Line")`

Plus 1 local procedures.

## Recent changes

- 2026-08-12 [#9968 [BC-IN] TDS Amount Not Calculated on Initial TDS Section Selection in Bank Payment Voucher](../../changes/bcapps/9968.md) (main, BC30, fix)

## Across versions

- Present in: BC29-30
- Changed (declaration) in: none

Source: AL metadata extracted from the code (names, ids, signatures, properties); no code bodies (D10).

## Ask your agent

Procedure bodies are not stored here (D10). For a procedure body or the calls of one procedure, ask bc-code-atlas (external, by Stefan Maron, MIT; default corpus w1-28), which the bc-observatory plugin connects: `bcatlas_resolve_node(object_type: "codeunit", object_name: "Calculate Tax")`, then `bcatlas_get_procedure_body` or `bcatlas_get_neighbors` on the returned id.

A IN country object, not part of W1: the default corpus does not have it; `bcatlas_list_countries` shows which countries the atlas has.