> ## Documentation Index > Fetch the complete documentation index at: https://developer.trychart.com/llms.txt > Use this file to discover all available pages before exploring further. # Download Unsigned Form 8821 > Download an unsigned IRS Form 8821. ## OpenAPI ````yaml POST /providers/irs/f8821/unsigned openapi: 3.0.1 info: title: Chart API description: >- Chart Tax API offers real-time collection of verified federal and state tax records. version: 1.0.0 servers: - url: https://api.trychart.com security: - bearerAuth: [] paths: /providers/irs/f8821/unsigned: post: description: Download an unsigned IRS Form 8821. requestBody: content: application/json: schema: $ref: '#/components/schemas/UnsignedIRS8821FormState' responses: '200': description: Unsigned IRS Form 8821 Response headers: Content-Disposition: schema: type: string Content-Length: schema: type: integer Cache-Control: schema: type: string content: application/pdf: schema: type: string format: binary '500': description: Failed to generate PDF content: application/json: schema: type: object properties: message: type: string security: - clientAuth: [] components: schemas: UnsignedIRS8821FormState: type: object properties: personalInfo: $ref: '#/components/schemas/PersonalInfoInput' businessInfo: $ref: '#/components/schemas/BusinessInfoInput' address: $ref: '#/components/schemas/AddressInput' form56: $ref: '#/components/schemas/IRS56FormState' description: >- IRS Form 56 (https://www.irs.gov/pub/irs-pdf/f56.pdf). Only required if the signer of the form 8821 is the fiduciary and not the taxpayer. extraDesignees: type: array items: $ref: '#/components/schemas/CAFDesignee' required: - personalInfo - address PersonalInfoInput: type: object properties: firstName: type: string minLength: 1 maxLength: 50 pattern: ^[a-zA-Z][a-zA-Z\s-]*$ example: John description: >- Alpha string value with a limit of 50 characters. Only hyphens (-) and spaces are allowed as special characters. lastName: type: string minLength: 1 maxLength: 50 pattern: ^[a-zA-Z][a-zA-Z\s-]*$ example: Doe description: >- Alpha string value with a limit of 50 characters. Only hyphens (-) and spaces are allowed as special characters. ssn: type: string minLength: 9 maxLength: 9 example: '123456789' description: >- Full SSN of the taxpayer. Required for non-business form 8821 submissions. required: - firstName - lastName BusinessInfoInput: type: object properties: name: type: string minLength: 1 example: Test, Inc. taxId: type: string description: EIN or SSN of the taxpayer minLength: 9 maxLength: 9 example: '123456789' type: type: string enum: - S-Corporation - C-Corporation - Sole Proprietorship - Partnerships phone: type: string pattern: ^[0-9]{10}$ example: '1112223344' title: type: string enum: - Managing Member - Partner - Limited Partner - Director - Chief Accounting Officer - Chief Executive Officer - Chief Operating Officer - Chief Financial Officer - President - Vice President - Secretary - Treasurer - Assistant Treasurer - Controller - Owner - Sole Proprietor - Executor - Beneficiary - Trustee - Administrator example: Chief Executive Officer required: - name - taxId - type - phone - title AddressInput: type: object properties: street: type: string minLength: 1 example: 123 Main St other: type: string example: Apt 1 city: type: string minLength: 1 example: San Francisco state: type: string minLength: 1 example: CA zip: type: string minLength: 1 example: '94101' required: - street - city - state - zip IRS56FormState: type: object properties: identification: type: object properties: taxpayer: type: object properties: name: type: string minLength: 1 description: >- Name of person for whom you are acting (as shown on the tax return) address: type: object properties: street: type: string minLength: 1 description: >- Address of person for whom you are acting (number, street) other: type: string city: type: string minLength: 1 description: City or town, state, and ZIP code state: type: string minLength: 1 zip: type: string minLength: 1 identificationNumber: type: string pattern: ^\d{9}$ description: >- Identification number must be exactly 9 digits and numeric only decedentSSN: type: string pattern: ^\d{9}$ description: SSN must be exactly 9 digits and numeric only required: - name - address fiduciary: type: object properties: name: type: string minLength: 1 description: Fiduciary's name address: type: object properties: street: type: string minLength: 1 description: Fiduciary's address (number, street, and room) other: type: string city: type: string minLength: 1 description: Fiduciary's city state: type: string minLength: 1 description: Fiduciary's state zip: type: string minLength: 1 description: Fiduciary's ZIP code required: - name - address required: - taxpayer - fiduciary authority: type: object properties: '1': type: string enum: - a - b - c - d - e - f - g 1gDesc: type: string 2a: type: string 2b: type: string tax: type: object properties: '5': type: string types: type: array items: type: string enum: - Income - Gift - Estate - Generation-skipping Transfer - Employment - Excise - Other typeDesc: type: string forms: type: array items: type: string enum: - a - b - c - d - e - f - g - h formDesc: type: string proceedings: type: object properties: name: type: string minLength: 1 description: >- Name of court (if other than a court proceeding, identify the type of proceeding and name of agency) address: type: object properties: street: type: string minLength: 1 description: Address of court other: type: string city: type: string minLength: 1 description: City or town, state, and ZIP code state: type: string minLength: 1 zip: type: string minLength: 1 date: type: string minLength: 1 description: Date of proceeding time: type: object properties: text: type: string minLength: 1 description: Time of proceeding amOrPm: type: string enum: - AM - PM initiationDate: type: string minLength: 1 description: Date proceeding initiated docketNumber: type: string minLength: 1 description: Docket number placeOfOtherProceedings: type: string title: type: string CAFDesignee: type: object properties: name: type: string minLength: 1 address: $ref: '#/components/schemas/AddressInput' cafNumber: type: string minLength: 1 monitorIRSNotices: type: boolean required: - name - address securitySchemes: bearerAuth: type: http scheme: bearer description: Please use your access_token returned from the /auth/token endpoint. clientAuth: type: http scheme: bearer description: >- Please use base64 encoded client_id:client_secret. You can use this command to generate the base64 encoded string: echo -n 'client_id:client_secret' | base64 ````