Overview
Applicants can upload documents to Konfir in cases where digital data sources alone may not fully evidence an applicant’s employment or income history - such as non-PAYE work (e.g. sole traders, freelancers, and limited company directors).
Uploaded documents are automatically scanned for fraud signals and validated before relevant data fields are extracted and used in verification.
Availability & Limitations
Currently, document upload is limited to HMRC-issued SA302s (also called a “tax calculation” or “tax computation”).
An SA302 summarises an individual’s taxable income and tax owed for a given tax year, based on their submitted Self Assessment return. It is the industry standard document for evidencing self-employment income.
Applicants can obtain an SA302 through their HMRC online account, provided that they:
Are or were self-employed
Have completed at least one full tax year
Have submitted (and paid) their Self Assessment return
Earned over £1,000 from self-employment
Completed their Self Assessment tax return via HMRC's online service, not via an accountant or commercial software.
Process
1. Documents requested
Documents are requested only when relevant to the activities being verified and are uploaded by the applicant during the Konfir journey.
Applicants must upload one SA302 per tax year, covering the relevant self-employment period.
2. Documents uploaded
The applicant uses HMRC to download their SA302 document. They then upload the requested documents to Konfir (see Applicant Experience).
Upload Requirements
Upload Requirements
Category | Accepted | Not accepted |
Document type | HMRC SA302 – tax calculation HMRC SA302 – tax year overview | Tax returns, bank statements, payslips, invoices
|
Source | Downloaded directly from HMRC online account | - Screenshots or scans - Accountant or software-generated SA302s |
Integrity | Original, unmodified files | Redacted, altered, or AI-generated files |
File Type | PDF, PNG, or JPEG
| Any other format |
File Size | Under 5MB | Over 5MB |
Example
Example
For your reference, an SA302 looks like this:
3. Fraud checks
Konfir applies structural and technical checks to assess document authenticity. These include:
analysing file metadata to understand how the file was created or modified
reviewing layout, fonts, and images for signs of alteration
validating that key data points and applicant details follow expected patterns
Only documents that pass these checks are used in verification.
4. Data extraction
Konfir extract fields from SA302s to support verification, including name, tax year start/end dates
Note: Income figures are not currently surfaced as extracted fields and must be reviewed by opening the returned SA302 document in Konsole.
5. Result
Konfir returns the following in Konsole (and via API where enabled):
The extracted data
The original SA302 document(s) for review & download
