`tax.adjustments.update`

Record reviewed regular-method GST/HST adjustments, instalments, rebates and self-assessments in CAD minor units, with reason, source evidence, revision and the current ledger snapshot. This does not remit tax or file a return.

POST/api/v1/accounting/tax.adjustments.update

Permissions

accounting:readaccounting:write

Who can call it

admin, finance

Retries

Idempotency key required, with expectedRevision

MCP

Not offered over MCP: Accountants' corrections grant isn't offered over MCP yet: phase 1 is read and comment only.

Fields

expectedRevisionintegerRequired
The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again.
0 to 9007199254740991
idempotencyKeystringRequired
Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match.
8–200 characters
periodobjectRequired
The period to cover.
No other fields
line104MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
line107MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
line110MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
line111MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
line205MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
line405MinorstringRequired
An amount in cents (the currency's smallest unit), written as a whole-number string such as "1250" for $12.50.
Whole number written as a string
reasonstringRequired
A short note saying why, kept in the record's history.
3–2000 characters
snapshotHashstringRequired
SHA-256 hash as 64 lowercase hex characters
evidenceIdsarray of strings (ID)
A list of record IDs.
at most 20 items · Default []

curl https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "expectedRevision": 3,
  "period": {
    "from": "2026-09-01",
    "to": "2026-09-30",
    "kind": "corporate"
  },
  "line104Minor": "1250",
  "line107Minor": "1250",
  "line110Minor": "1250",
  "line111Minor": "1250",
  "line205Minor": "1250",
  "line405Minor": "1250",
  "reason": "Synthetic example from the docs",
  "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c"
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "expectedRevision": 3,
    "period": {
      "from": "2026-09-01",
      "to": "2026-09-30",
      "kind": "corporate"
    },
    "line104Minor": "1250",
    "line107Minor": "1250",
    "line110Minor": "1250",
    "line111Minor": "1250",
    "line205Minor": "1250",
    "line405Minor": "1250",
    "reason": "Synthetic example from the docs",
    "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c"
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "expectedRevision": 3,
        "period": {
            "from": "2026-09-01",
            "to": "2026-09-30",
            "kind": "corporate",
        },
        "line104Minor": "1250",
        "line107Minor": "1250",
        "line110Minor": "1250",
        "line111Minor": "1250",
        "line205Minor": "1250",
        "line405Minor": "1250",
        "reason": "Synthetic example from the docs",
        "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c",
    },
    timeout=30,
)
payload = response.json()
if not response.ok:
    raise RuntimeError(f"{payload['error']['code']}: {payload['error']['message']}")
print(payload["data"])

Response

{
  "data": { … }
}

This action checks your data too, so replace the example values with your own before sending it.

Try it

Checks your input with this action’s real schema and answers like the API, with synthetic data. No key needed, and nothing changes.

Input

POST/api/v1/accounting/tax.adjustments.update

curl https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "expectedRevision": 3,
  "period": {
    "from": "2026-09-01",
    "to": "2026-09-30",
    "kind": "corporate"
  },
  "line104Minor": "1250",
  "line107Minor": "1250",
  "line110Minor": "1250",
  "line111Minor": "1250",
  "line205Minor": "1250",
  "line405Minor": "1250",
  "reason": "Synthetic example from the docs",
  "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c"
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "expectedRevision": 3,
    "period": {
      "from": "2026-09-01",
      "to": "2026-09-30",
      "kind": "corporate"
    },
    "line104Minor": "1250",
    "line107Minor": "1250",
    "line110Minor": "1250",
    "line111Minor": "1250",
    "line205Minor": "1250",
    "line405Minor": "1250",
    "reason": "Synthetic example from the docs",
    "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c"
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/tax.adjustments.update",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "expectedRevision": 3,
        "period": {
            "from": "2026-09-01",
            "to": "2026-09-30",
            "kind": "corporate",
        },
        "line104Minor": "1250",
        "line107Minor": "1250",
        "line110Minor": "1250",
        "line111Minor": "1250",
        "line205Minor": "1250",
        "line405Minor": "1250",
        "reason": "Synthetic example from the docs",
        "snapshotHash": "9f2b5c1d7e3a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4e6f8a0b2c4d6e8f0a2b4c",
    },
    timeout=30,
)
payload = response.json()
if not response.ok:
    raise RuntimeError(f"{payload['error']['code']}: {payload['error']['message']}")
print(payload["data"])

Fields

Fields inside period

Example

Try it