Something interesting is happening in Ghana’s money market, and it’s quietly playing out in two numbers people mostly do not pay particular attention.
Since January, the Bank of Ghana‘s own borrowing rate, technically called an Open Market Operations (OMO) bill, mostly the 14-day tenor, has been sliding, from a punchy 14.5% down to around 10.49% as of 1st July.
Meanwhile, the government’s own Treasury bill, the one everyday Ghanaians and businesses invest in, has been doing the opposite. The 91-day T-bill bottomed out near 4.7% in March, then climbed steadily to 5.3% by late June, and is now touching 5.9% at the start of July.
Two rates. Same market. Moving in opposite directions. Here’s why it matters.
The Trend, In Plain Terms
Think of it as two lanes on the same road, finally merging. For most of 2025 and early 2026, BoG was paying banks almost double what the government paid on T-bills, sometimes 12% versus under 5%. That gap was expensive for BoG and a headache for its books.
Now, the gap is closing: BoG’s rate is coming down, the government’s rate is going up, and they’re meeting somewhere in the middle.
Four Major Reasons Why This Is Happening
BoG Might Be Deliberately Reducing the Cost of OMO: Running its “mop-up” bills to keep inflation under control cost the Central Bank a lot. In 2025 alone, OMO bills alone cost the BoG GH¢16.7 billion, deepening the woes on its books.
With that lesson fresh, BoG might be deliberately shrinking its OMO rate and letting its rate drift down.
A New Reserve Rule Might Be Doing the Job for Free: In June, BoG raised the amount of cash banks must keep locked up (the Cash Reserve Ratio) to a flat 20%. Since banks earn nothing on those reserves, this quietly soaks up excess cash, without BoG having to pay interest for it, as it does with OMO.
Government Still Needs to Borrow Every Single Week: Whether or not liquidity is tight, the government must roll over maturing bills and fund the budget. When investor demand dips even slightly, the government has no choice but to offer a juicier rate to get the money in.
The Disinflation Rally Has Run Its Course: T-bill rates crashed all the way down as BoG cut its policy rate five times in a row. That easing cycle paused in May, holding at 14%. With no more rate cuts pushing yields down, and global oil-price jitters from the Middle East adding some inflation worry, T-bill yields have nowhere to go but sideways or up.
Why This Matters for You
If you save in T-bills, this is good news. 5.9% on a 91-day bill, with inflation near 3.7%, is a genuinely healthy real return. Your money is working harder than it was in March.
On the other hand, if you’re a borrower, there’s a silver lining here too. With OMO less rewarding for banks, they may lean more toward lending to businesses and individuals instead of parking cash with BoG, part of why average lending rates have already fallen from about 19% to 16% this year.
For the national economy, every uptick in T-bill rates raises what the government pays to borrow domestically. This is a real cost that could chip away at the debt relief Ghana has enjoyed from a stronger cedi.
Moreover, for the Cedi and the economy broadly, a cheaper, smaller OMO bill means less financial strain on the BoG’s balance sheet, a genuine step toward healthier monetary policy. But if T-bill rates keep climbing while OMO keeps falling, it could be an early signal that investors want a bit more comfort from government paper, especially with Ghana’s IMF programme winding down.
The Bottomline
On paper, this isn’t a crisis. It looks more like Ghana’s money market finding its natural balance after years of an expensive, lopsided arrangement.
But the direction of travel, OMO down, T-bills up, is one worth watching closely in the months ahead. Because whichever way it tilts next says a lot about whether Ghana’s economic recovery is truly settling in or just catching its breath.
