What would this bond pay me?
Pick a bond, say how much you would put in, and see what actually reaches you once Kenyan tax is taken off. Infrastructure bonds pay their coupon whole; everything else loses 10% or 15% to withholding tax, which is often what separates two bonds whose headline rates look alike.
The three tax bands, and why they decide more than the coupon
Kenyan withholding tax on government bond interest is not one rate. Infrastructure bonds pay their coupon whole — no withholding at all. Other bonds with an original tenor of ten years or more are withheld at 10%. Anything shorter is withheld at 15%.
That spread does more work than most coupon differences. A tax-free infrastructure bond at 13% leaves you 13%; a 14% bond withheld at 15% leaves you 11.9%. The bond with the higher headline pays you less, which is the single most common way a comparison made on coupon alone goes wrong.
Yield depends on what you paid, not on the coupon
A coupon is a percentage of face value. Your yield is a percentage of what you actually handed over. Where this app holds no price for a bond it uses 100 as a placeholder — par — and that is a stand-in, not a market quote. Record what you paid or were quoted in your price book and every figure here recomputes against it.
What this page cannot tell you
We publish no secondary-market prices. Nothing here is a valuation, and nothing here says what a bond is worth to sell today. The figures are what a bond pays if you hold it, given a price you supply. Auction results tell you what other bidders accepted on the day — a useful comparison, and still not a price. See where every figure comes from.
Nor is any of it advice. It is arithmetic on figures you can check, which is why the workings are shown rather than only the answer.