Check the advert before you write anything
Some PSC Circular adverts explicitly require a cover letter; many do not and only require the Z83 and CV. Writing one when it is not requested is not usually held against you, but writing a weak or generic one when it IS requested can actively count against you, because it signals the applicant did not read the advert carefully. Before drafting anything, re-read the advert once specifically to check for the phrase "covering letter" or "cover letter" in the requirements section.
Opening paragraph: the post reference number is not optional
Your first paragraph should state the exact post title and reference number as they appear in the circular, and nothing else. Screeners at large departments are matching hundreds of cover letters to specific vacancies at once, often manually. A letter that opens with the reference number in the first line gets filed correctly on the first read. A letter that opens with "I am writing to express my interest in..." without the reference number risks being set aside while the screener checks the Z83 to confirm which post it belongs to — an extra step that, at volume, works against you.
Second paragraph: match language to the advert's requirements, not your CV
This is where most cover letters go wrong. Applicants often summarise their CV in prose form, which adds no new information the screener does not already have. Instead, take the minimum requirements listed in the advert — qualification, years of experience, specific competencies — and address each one directly, in the same order they appear in the advert, using close to the same terminology.
If the advert asks for "sound knowledge of the PFMA and Treasury Regulations," do not write "I have strong financial management experience." Write "I have applied the PFMA and Treasury Regulations directly in [specific context]." Government screening is compliance-driven; matching the advert's own language makes it far easier for a screener working through a checklist to tick the box.
Third paragraph: why this department, specifically
A generic line like "I am passionate about public service" appears in a large share of the cover letters any government HR unit receives and carries no weight on its own. A stronger approach is one specific, verifiable reason tied to the department's actual mandate — a current programme, a policy priority mentioned in the department's annual performance plan, or a specific unit you would be working within. This does not need to be lengthy. Two sentences that show you looked at what the department is actually doing outperform a paragraph of generic enthusiasm.
Closing paragraph and sign-off
Close by confirming your availability for an interview and restating the reference number once more. Sign off formally — "Yours faithfully" if you have not addressed a named individual, "Yours sincerely" if you have. Include your ID number and contact details under your signature even though this duplicates the Z83, because the cover letter and the Z83 are sometimes physically or digitally separated during processing, and each document should be able to stand on its own.
Length and formatting
One page. Three to four short paragraphs. No decorative fonts, no colour, no borders — government HR systems frequently scan and print submissions in black and white, and anything relying on colour or unusual formatting to make its point will not survive that process. Save the file as a PDF named clearly with your surname and the post reference number, for example "Nkosi_HR042026.pdf," so it is identifiable if separated from your other documents.
Apply faster with NewGenJobs
Set up your applicant profile once and NewGenJobs auto-fills your Z83 and generates a matched cover letter draft for each government post you apply to. Set up your profile here.