October 2026
Calculators are for planning and estimation only. Verify final tax, payroll, loan, investment or property figures with the relevant institution or adviser.
Banking / T-Bill returns by amount
A KSh 1,500,000 91-day Treasury Bill earns about KSh 27,220 after 15% tax. A 364-day bill earns about KSh 105,312. Rates are the CBK auction averages as of 5 November 2026.
Figures last updated 5 November 2026. Based on CBK average auction rates.
Face value is the amount you receive at maturity. Rates as of 5 November 2026.
| Security | Rate | You pay now | Gross interest | Tax | Net interest |
|---|---|---|---|---|---|
| 91-day T-Bill 15% withholding tax | 8.75% | KSh 1,467,976 | KSh 32,024 | −KSh 4,804 | KSh 27,220 |
| 182-day T-Bill 15% withholding tax | 8.845% | KSh 1,436,639 | KSh 63,361 | −KSh 9,504 | KSh 53,857 |
| 364-day T-Bill 15% withholding tax | 9.0282% | KSh 1,376,103 | KSh 123,897 | −KSh 18,585 | KSh 105,312 |
| Infrastructure Bond (IFB) Tax-free, 1-year illustration | 12.82% | KSh 1,329,551 | KSh 170,449 | KSh 0 | KSh 170,449 |
| Fixed Coupon Bond (FXD) 15% tax, 1-year illustration | 12.87% | KSh 1,328,963 | KSh 171,037 | −KSh 25,656 | KSh 145,382 |
Estimates using CBK average auction rates, not a guaranteed return. Bond rates are from the 5 October 2026 auction and use a one-year simplification; real bonds pay coupons over several years. See the T-Bill calculator or the T-Bills vs bonds guide.
Quick Answers
At the 8.75% average rate, a KSh 1,500,000 91-day T-Bill costs about KSh 1,467,976 today. It matures at KSh 1,500,000, giving KSh 32,024 gross interest, or about KSh 27,220 after 15% withholding tax.
Net interest is about KSh 27,220 over 91 days and KSh 105,312 over 364 days, but your money is locked up longer for the 364-day bill. The 182-day bill earns about KSh 53,857.
No. Interest on infrastructure bonds is tax-free. As a one-year illustration at 12.82%, KSh 1,500,000 would earn about KSh 170,449. Real IFBs run for several years, so check the specific issue.
T-Bills are sold at a discount. You pay less than the face value now and receive the full face value at maturity; the difference is your interest. Figures here are estimates from the average auction rate, and your actual rate depends on the auction.
Calculators are for planning and estimation only. Verify final tax, payroll, loan, investment or property figures with the relevant institution or adviser.