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extract-t4-slip-data

Extract structured fields from t4 slip documents.

iterationlayer/skills
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Extract T4 Slip Data

Payroll and HR teams use this recipe to extract T4 Slip fields into structured JSON for payroll checks, employee records, and finance reconciliation.

APIs Used

Document Extraction (1 credit per page)

Prerequisites

You need an Iteration Layer API key. Get one at platform.iterationlayer.com during the 7-day trial.

For full integration guidance (SDKs, auth, MCP, error handling), see the Iteration Layer Integration Guide.

Implementation

curl -X POST https://api.iterationlayer.com/document-extraction/v1/extract \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "files": [
    {
      "type": "url",
      "name": "t4-slip.pdf",
      "url": "https://example.com/documents/t4-slip-sample.pdf"
    }
  ],
  "schema": {
    "fields": [
      {
        "name": "employee_name",
        "type": "TEXT",
        "description": "Employee name"
      },
      {
        "name": "employer_name",
        "type": "TEXT",
        "description": "Employer name"
      },
      {
        "name": "employee_identifier",
        "type": "TEXT",
        "description": "Employee, payroll, or taxpayer identifier"
      },
      {
        "name": "period_end_date",
        "type": "DATE",
        "description": "Pay period, statement, or tax year end date"
      },
      {
        "name": "gross_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Gross pay or taxable compensation"
      },
      {
        "name": "tax_withheld",
        "type": "CURRENCY_AMOUNT",
        "description": "Tax withheld"
      },
      {
        "name": "social_contributions",
        "type": "CURRENCY_AMOUNT",
        "description": "Social security or payroll contributions"
      },
      {
        "name": "net_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Net pay"
      },
      {
        "name": "currency",
        "type": "CURRENCY_CODE",
        "description": "Currency code"
      }
    ]
  }
}'

import { IterationLayer } from "iterationlayer";

const client = new IterationLayer({ apiKey: "YOUR_API_KEY" });

const result = await client.extractDocument({
  "files": [
    {
      "type": "url",
      "name": "t4-slip.pdf",
      "url": "https://example.com/documents/t4-slip-sample.pdf"
    }
  ],
  "schema": {
    "fields": [
      {
        "name": "employee_name",
        "type": "TEXT",
        "description": "Employee name"
      },
      {
        "name": "employer_name",
        "type": "TEXT",
        "description": "Employer name"
      },
      {
        "name": "employee_identifier",
        "type": "TEXT",
        "description": "Employee, payroll, or taxpayer identifier"
      },
      {
        "name": "period_end_date",
        "type": "DATE",
        "description": "Pay period, statement, or tax year end date"
      },
      {
        "name": "gross_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Gross pay or taxable compensation"
      },
      {
        "name": "tax_withheld",
        "type": "CURRENCY_AMOUNT",
        "description": "Tax withheld"
      },
      {
        "name": "social_contributions",
        "type": "CURRENCY_AMOUNT",
        "description": "Social security or payroll contributions"
      },
      {
        "name": "net_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Net pay"
      },
      {
        "name": "currency",
        "type": "CURRENCY_CODE",
        "description": "Currency code"
      }
    ]
  }
});

from iterationlayer import IterationLayer

client = IterationLayer(api_key="YOUR_API_KEY")

result = client.extract_document(**{
  "files": [
    {
      "type": "url",
      "name": "t4-slip.pdf",
      "url": "https://example.com/documents/t4-slip-sample.pdf"
    }
  ],
  "schema": {
    "fields": [
      {
        "name": "employee_name",
        "type": "TEXT",
        "description": "Employee name"
      },
      {
        "name": "employer_name",
        "type": "TEXT",
        "description": "Employer name"
      },
      {
        "name": "employee_identifier",
        "type": "TEXT",
        "description": "Employee, payroll, or taxpayer identifier"
      },
      {
        "name": "period_end_date",
        "type": "DATE",
        "description": "Pay period, statement, or tax year end date"
      },
      {
        "name": "gross_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Gross pay or taxable compensation"
      },
      {
        "name": "tax_withheld",
        "type": "CURRENCY_AMOUNT",
        "description": "Tax withheld"
      },
      {
        "name": "social_contributions",
        "type": "CURRENCY_AMOUNT",
        "description": "Social security or payroll contributions"
      },
      {
        "name": "net_pay",
        "type": "CURRENCY_AMOUNT",
        "description": "Net pay"
      },
      {
        "name": "currency",
        "type": "CURRENCY_CODE",
        "description": "Currency code"
      }
    ]
  }
})

package main

import il "github.com/iterationlayer/sdk-go"

func main() {
	client := il.NewClient("YOUR_API_KEY")

	result, err := client.ExtractDocument(il.ExtractDocumentRequest{
		Files: []il.FileInput{
			il.FileInput{
				Type: "url",
				Name: "t4-slip.pdf",
				Url: "https://example.com/documents/t4-slip-sample.pdf",
			},
		},
		Schema: il.ExtractionSchema{
			Fields: []any{
				il.TextFieldConfig{
					Name: "employee_name",
					Type: "TEXT",
					Description: "Employee name",
				},
				il.TextFieldConfig{
					Name: "employer_name",
					Type: "TEXT",
					Description: "Employer name",
				},
				il.TextFieldConfig{
					Name: "employee_identifier",
					Type: "TEXT",
					Description: "Employee, payroll, or taxpayer identifier",
				},
				il.DateFieldConfig{
					Name: "period_end_date",
					Type: "DATE",
					Description: "Pay period, statement, or tax year end date",
				},
				il.CurrencyAmountFieldConfig{
					Name: "gross_pay",
					Type: "CURRENCY_AMOUNT",
					Description: "Gross pay or taxable compensation",
				},
				il.CurrencyAmountFieldConfig{
					Name: "tax_withheld",
					Type: "CURRENCY_AMOUNT",
					Description: "Tax withheld",
				},
				il.CurrencyAmountFieldConfig{
					Name: "social_contributions",
					Type: "CURRENCY_AMOUNT",
					Description: "Social security or payroll contributions",
				},
				il.CurrencyAmountFieldConfig{
					Name: "net_pay",
					Type: "CURRENCY_AMOUNT",
					Description: "Net pay",
				},
				il.CurrencyCodeFieldConfig{
					Name: "currency",
					Type: "CURRENCY_CODE",
					Description: "Currency code",
				},
			},
		},
	})
	if err != nil {
		panic(err)
	}

	_ = result
}

{
  "name": "Extract T4 Slip Data",
  "nodes": [
    {
      "parameters": {
        "content": "## Extract T4 Slip Data\n\nPayroll and HR teams use this recipe to extract T4 Slip fields into structured JSON for payroll checks, employee records, and finance reconciliation.\n\n**Note:** This workflow uses the Iteration Layer community node (`n8n-nodes-iterationlayer`). Install it via Settings > Community Nodes on self-hosted n8n, or add it directly on n8n Cloud with Verified Community Nodes enabled.",
        "height": 280,
        "width": 500,
        "color": 2
      },
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        200,
        40
      ],
      "id": "extract-t4-slip-data-overview",
      "name": "Overview"
    },
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        250,
        300
      ],
      "id": "extract-t4-slip-data-trigger",
      "name": "Manual Trigger"
    },
    {
      "parameters": {
        "resource": "documentExtraction",
        "schemaInputMode": "rawJson",
        "schemaJson": "{\n  \"fields\": [\n    {\n      \"name\": \"employee_name\",\n      \"type\": \"TEXT\",\n      \"description\": \"Employee name\"\n    },\n    {\n      \"name\": \"employer_name\",\n      \"type\": \"TEXT\",\n      \"description\": \"Employer name\"\n    },\n    {\n      \"name\": \"employee_identifier\",\n      \"type\": \"TEXT\",\n      \"description\": \"Employee, payroll, or taxpayer identifier\"\n    },\n    {\n      \"name\": \"period_end_date\",\n      \"type\": \"DATE\",\n      \"description\": \"Pay period, statement, or tax year end date\"\n    },\n    {\n      \"name\": \"gross_pay\",\n      \"type\": \"CURRENCY_AMOUNT\",\n      \"description\": \"Gross pay or taxable compensation\"\n    },\n    {\n      \"name\": \"tax_withheld\",\n      \"type\": \"CURRENCY_AMOUNT\",\n      \"description\": \"Tax withheld\"\n    },\n    {\n      \"name\": \"social_contributions\",\n      \"type\": \"CURRENCY_AMOUNT\",\n      \"description\": \"Social security or payroll contributions\"\n    },\n    {\n      \"name\": \"net_pay\",\n      \"type\": \"CURRENCY_AMOUNT\",\n      \"description\": \"Net pay\"\n    },\n    {\n      \"name\": \"currency\",\n      \"type\": \"CURRENCY_CODE\",\n      \"description\": \"Currency code\"\n    }\n  ]\n}",
        "files": {
          "fileValues": [
            {
              "fileInputMode": "url",
              "fileName": "t4-slip.pdf",
              "fileUrl": "https://example.com/documents/t4-slip-sample.pdf"
            }
          ]
        }
      },
      "type": "n8n-nodes-iterationlayer.iterationLayer",
      "typeVersion": 1,
      "position": [
        500,
        300
      ],
      "id": "extract-t4-slip-data-extract",
      "name": "Extract Data",
      "credentials": {
        "iterationLayerApi": {
          "id": "1",
          "name": "Iteration Layer API"
        }
      }
    }
  ],
  "connections": {
    "Manual Trigger": {
      "main": [
        [
          {
            "node": "Extract Data",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}

Extract t4 slip data from the file at [file URL]. Use the extract_document tool with these fields:

- employee_name (TEXT): Employee name
- employer_name (TEXT): Employer name
- employee_identifier (TEXT): Employee, payroll, or taxpayer identifier
- period_end_date (DATE): Pay period, statement, or tax year end date
- gross_pay (CURRENCY_AMOUNT): Gross pay or taxable compensation
- tax_withheld (CURRENCY_AMOUNT): Tax withheld
- social_contributions (CURRENCY_AMOUNT): Social security or payroll contributions
- net_pay (CURRENCY_AMOUNT): Net pay
- currency (CURRENCY_CODE): Currency code

Response

{
  "success": true,
  "data": {
    "employee_name": {
      "value": "Employee Name",
      "confidence": 0.97,
      "citations": [
        "EMPLOYEE NAME"
      ]
    },
    "employer_name": {
      "value": "Employer Name",
      "confidence": 0.97,
      "citations": [
        "EMPLOYER NAME"
      ]
    },
    "employee_identifier": {
      "value": "Employee Identifier",
      "confidence": 0.97,
      "citations": [
        "EMPLOYEE IDENTIFIER"
      ]
    },
    "period_end_date": {
      "value": "2026-04-15",
      "confidence": 0.97,
      "citations": [
        "15 Apr 2026"
      ]
    },
    "gross_pay": {
      "value": {
        "amount": "1234.56",
        "currency": "USD"
      },
      "confidence": 0.97,
      "citations": [
        "$1,234.56"
      ]
    },
    "tax_withheld": {
      "value": {
        "amount": "1234.56",
        "currency": "USD"
      },
      "confidence": 0.97,
      "citations": [
        "$1,234.56"
      ]
    },
    "social_contributions": {
      "value": {
        "amount": "1234.56",
        "currency": "USD"
      },
      "confidence": 0.97,
      "citations": [
        "$1,234.56"
      ]
    },
    "net_pay": {
      "value": {
        "amount": "1234.56",
        "currency": "USD"
      },
      "confidence": 0.97,
      "citations": [
        "$1,234.56"
      ]
    },
    "currency": {
      "value": "USD",
      "confidence": 0.97,
      "citations": [
        "CURRENCY"
      ]
    }
  }
}

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