The irp number is a unique 10-digit identifier issued by the South African Revenue Service (SARS) to individuals and entities registering under the Income Tax Withholding system. It ensures accurate tracking of tax deductions from income, particularly for employees, pensioners, and certain contractors.
Every person or business that receives taxable income through payroll, pensions, or contract work must register with SARS using an irp number. This number appears on payslips, tax returns, and official correspondence related to income tax withholding. Without it, employers cannot legally deduct tax from payments.
SARS requires the irp number for compliance with the Income Tax Act, No. 58 of 1962. It prevents duplicate registrations and supports audit trails. For example, if an employee changes jobs, their irp number remains consistent across all employer records.
When someone registers for income tax withholding, they submit personal details-name, ID number, address, and employment status-to SARS via the eFiling portal or a physical form. After verification, SARS assigns a unique irp number. This number is not tied to a specific employer; it belongs to the individual or entity.
Employers use the irp number to calculate PAYE (Pay As You Earn) tax. They enter the number into their payroll software, which pulls the correct tax brackets based on the individual's annual income and tax code. The system helps tax is withheld at the correct rate, reducing underpayment or overpayment risks.
For example, a teacher earning R600,000 annually in South Africa would have an irp number linked to a tax code that applies progressive rates. The employer uses this number to withhold approximately R120,000 in PAYE annually, based on current tax tables.
Individuals receiving regular income from employment, pensions, or annuities must register for an irp number. This includes permanent staff, temporary workers, and retirees drawing monthly pensions. Contractors paid under a service agreement may also require one if they are not registered as independent businesses.
Businesses that pay employees must obtain irp numbers for each worker. Failure to do so results in penalties under SARS Regulation 117(1)(b). Employers must report all irp numbers quarterly through the eFiling system.
Non-residents receiving South African-sourced income-such as foreign consultants working on local projects-must also apply. SARS treats these cases under the Double Taxation Agreement structure, requiring irp numbers for cross-border tax compliance.
| Type of User | Must Register? | Common Use Case |
|---|---|---|
| South African employee | Yes | Monthly salary deduction via PAYE |
| Pensioner | Yes | Withholding tax on monthly pension payments |
| Contractor (non-business) | Yes | Income taxed at source if not operating as a sole trader |
| Foreign consultant | Yes | Tax withheld on fees earned in South Africa |
Many people confuse the irp number with the South African ID number. While both are 13-digit identifiers, the irp number is issued exclusively by SARS for tax purposes. The ID number is issued by Home Affairs and used for national identification.
A frequent error occurs when employers assign irp numbers manually. SARS mandates that only verified registrations through official channels generate valid irp numbers. Manually entered numbers often fail validation during eFiling submissions, leading to processing delays.
Another issue arises when individuals assume they don't need an irp number because they earn below the tax threshold. However, even low-income earners must register if they receive income subject to withholding. For example, a domestic worker earning R10,000/month still requires an irp number for proper PAYE calculation.
Consider Thandi Mokoena, a graphic designer hired by a marketing firm in Johannesburg. She earns R25,000 per month. Her employer must register her with SARS before her first paycheck.
Step 1: The employer logs into the SARS eFiling portal and selects "Register New Employee."
Step 2: They enter Thandi's full name, South African ID number, home address, and employment start date.
Step 3: SARS validates the data and issues an irp number: 1234567890.
Step 4: The employer inputs the irp number into their payroll system and calculates PAYE based on the applicable tax code.
Thandi's first payslip shows R2,450 deducted as PAYE, which aligns with the current tax table for monthly income between R20,001 and R30,000. Her irp number ensures consistency across all future pay periods.
After six months, Thandi leaves the company. Her former employer reports her final payment and irp number to SARS. The new employer then verifies her irp number via the SARS portal before processing her next paycheck.
The irp number is distinct from the VAT number, which applies to businesses charging VAT on goods and services. It is also different from the SARS reference number used in tax return filings. Each serves a unique purpose within the tax system.
Some taxpayers mistakenly believe the irp number is required only for high earners. But SARS mandates registration for anyone receiving taxable income, regardless of amount. Even a part-time worker earning R5,000/month must have an irp number if taxed at source.
One non-obvious fact: irp numbers are not reusable. If an individual dies, their irp number is deactivated and cannot be reassigned. SARS maintains a database of active and inactive irp numbers for audit and fraud prevention.
You can verify your irp number through the SARS eFiling portal. Log in with your credentials, go to "My Profile," and select "View My IRP Number." Alternatively, contact SARS via the toll-free number 0800 00 7277 or visit a local branch.
I once assisted a client who had submitted a tax return with an incorrect irp number due to a typo. The return was rejected, delaying her refund by four weeks. After correcting the number and resubmitting, she received her refund within ten days. Always double-check the number before filing.
Understanding the irp number is essential for compliance with South African tax law. It enables accurate tax withholding, simplifies reporting, and prevents penalties. Anyone receiving income subject to withholding must obtain and maintain a valid irp number.