Kill the Stack Weekly: The Fork Edition
May 4, 2026
Wednesday afternoon I sat down with the Bank of Canada’s April Monetary Policy Report and watched Tiff Macklem do something central bankers don’t usually do in public: lay out two opposite outcomes as live, equally weighted scenarios. If oil stays elevated, consecutive rate hikes are on the table. If the U.S. tightens trade restrictions in the CUSMA review, deeper cuts become necessary. Same press conference. Both directions.
Twenty-four hours earlier, Jerome Powell had chaired an FOMC vote that split 8-4. It was the most dissents at a single Fed meeting since October 1992. One governor wanted a cut. Three regional presidents wanted the “easing bias” stripped from the statement and replaced with symmetric language. They wanted the Fed to say, on the record, that the next move could go either way.
Two central banks, in twenty-four hours, said the same thing in different vocabularies: we don’t have a base case anymore.
That changes everything underneath. Almost every lender’s pricing engine, retention script, hedging book, lock workflow, and renewal communication assumes a direction. Down rates are good for refi. Up rates are good for retention. Every motion the system makes is wired to a forecast.
When the central bank itself says “either is plausible,” that wiring becomes a liability.
Here’s what the week showed.
United States
Rates back up. Borrowed motion just ended.
The 30-year fixed rose to 6.30% as of April 30 (Freddie Mac PMMS), up from 6.23% the prior week. That’s the first increase after three consecutive declines. The 15-year averaged 5.64%. The 10-year Treasury closed near 4.40% Thursday and held at 4.39% Friday.
The MBA applications survey for the week ending April 24 confirmed the turn: total applications down 1.6%, refis down 4%, refi share back to 42.5% from 44.2% the week before. Purchases up 1% on the week, still up 21% year-over-year. The marginal weekly print rolled negative the moment yields lifted.
My take: Last week’s edition named borrowed motion: pipeline activity wired to bond yields rather than generated by the lender’s own architecture. This week is the back-test. Yields lifted on the Iran-conflict premium and a hot core PCE print, refi share softened, applications softened, and three weeks of cosmetic recovery evaporated in five trading days. Same wiring, same input, opposite output. A pipeline that lights up and dims with a single external twitch is not generating flow. It’s mirroring weather. The lenders treating this as a setback are still reading the rate. The ones treating it as data are reading the architecture underneath.
The 8-4 vote isn’t political theater. It’s an architectural signal.
The Fed’s dissents broke in both directions. Stephen Miran wanted a 25 bp cut. Beth Hammack, Neel Kashkari, and Lorie Logan didn’t object to the hold. They objected to the easing-bias language and wanted the statement to say explicitly that the next move could go either way. They lost the vote on language. They didn’t lose the underlying point.
Core PCE for March, released Thursday, came in at 3.2% year-over-year, up from 3.0% the month before. The hawks have a case. The dove has a case. Powell exits as chair on May 15 and stays on as governor; Kevin Warsh’s nomination cleared the Senate Banking Committee 13-11 the same Wednesday the Fed was voting.
My take: Read this as a forecast lock signal, not palace intrigue. When the central bank itself can’t agree on direction, every lender whose system requires a directional consensus to function is exposed. Pricing engines tuned for an easing cycle. Retention workflows assuming refi opportunity. Hedging desks running short-duration bets on cuts. None are wrong yet. That’s the trap. They’re wrong only when the move comes the other way and you find out from the P&L. Architecture that holds both paths and switches without human intervention is the difference between a thesis being right and a quarter being whole.
Fannie Mae just told the industry to govern AI. Most aren’t ready.
Lender Letter LL-2026-04, issued April 8 and taking effect August 8, requires every Fannie Mae seller or servicer using AI or ML in origination or servicing to operate under a documented governance program. That means written policies covering the full life cycle of any AI/ML system, annual review, a designated owner, communication to relevant staff, and vendor-risk management on subcontractors using the same tools. It is the first sector-specific AI governance mandate in U.S. mortgage. Coverage and analysis caught up to it this week.
It lands alongside AD Mortgage’s 2026 Broker Survey, released Thursday, which reported that 55% of brokers now use AI daily or regularly (35% daily, 20% regular). 54% have not yet decided which technologies to adopt.
My take: Two facts on a collision course. Most brokers and lenders bought tools before they architected anything. They have AI-as-feature, not AI-as-substitute. The governance mandate isn’t asking whether you use AI. It’s asking whether you can govern it. Full life cycle, owner, vendor diligence, documented at the policy level, by August 8. The lenders who treated AI as a tool drawer will spend the summer writing governance documents about software they don’t actually understand. The lenders who chose an architecture have one document to update. Tools accumulate. Architecture chooses. The mandate is going to make that distinction visible to the GSEs in writing.
Canada
BoC said the quiet part out loud: there is no base case.
Macklem held at 2.25% as expected on April 29 and used most of the press conference to walk through two scenarios. The base case has inflation peaking near 3% in April 2026 and easing back to the 2% target in early 2027, but only if oil recedes as expected. In the alternative scenario where oil stays around US$100 a barrel, the Bank projects inflation peaking at 3.1% in Q1 2027 and lingering near 3% for a year, opening the door to consecutive rate hikes. If instead the U.S. sharpens trade restrictions in the CUSMA review (the formal Joint Review opens July 1), cuts become necessary to support the economy. The Bank’s growth path of 1.2% in 2026, 1.6% in 2027, and 1.7% in 2028 depends on which scenario lands.
The 5-year Government of Canada bond yield closed near 3.22% Thursday. Best 5-year fixed through brokers sits around 4.04%; RBC’s posted 5-year at the bank tier is 4.29%. The spread between the policy rate and what borrowers actually pay continues to widen.
My take: The Bank of Canada has now joined the Fed in publicly declining to commit to a direction. For Canadian lenders this changes how every renewal conversation in 2026 has to sound. “Rates will probably move lower” is now wrong in both directions. The conversations that retain borrowers will be scenario-based. Here’s your payment under oil-up. Here’s your payment under trade-down. Not directional. Servicers running single-rate-narrative scripts will lose borrowers to brokers who can model both within an active call. That’s not a comms problem. It’s an infrastructure problem.
CUSMA prep just opened its first meeting
Carney’s 24-member Advisory Committee on Canada-U.S. Economic Relations met for the first time on April 27, prepping for the formal CUSMA Joint Review starting July 1. Roughly C$33 billion of Canadian construction inputs, about 8% of the total, comes from the U.S. The active tariff layer on those inputs (50% on steel, 50% on aluminum, 25% on autos, lumber duties layered in) compounds directly into homebuilding cost. Carney named those tariffs as the live irritants and ruled out concessions before formal talks.
My take: The renewal wave is already the largest simultaneous payment shock in Canadian lending history. Layer a CUSMA outcome on top of it (bilateral, sector-specific, multi-quarter), and every renewal conversation in 2026 has a trade-policy variable baked in. Reinertsen’s principle applies: when variability rises, the value of fast feedback rises with it. Renewal infrastructure that surfaces scenarios in seconds wins. The infrastructure that surfaces them after a loan officer manually pulls a rate sheet doesn’t.
The bottom line
Two central banks made rate decisions in 24 hours. Both held. Both, in different vocabularies, said the next move could go either direction. The Fed had its biggest dissent in 33 years. The Bank of Canada laid out opposite scenarios as live possibilities. Mortgage rates ticked back up. Refis softened. Core PCE stayed hot. Fannie Mae’s first sector-specific AI governance mandate is now 90 days from going live. The CUSMA prep cycle opened.
The base case died this week. Quietly, on a Tuesday and a Wednesday, in two press conferences nobody covered the same way.
Forecast lock is the cost lenders pay when pricing, communications, retention, renewal, and hedging infrastructure assume a direction the central banks themselves no longer assume. Most lenders won’t see the bill until the next move comes the wrong way and the workflow doesn’t bend.
The lenders with infrastructure that holds both paths and switches without intervention spent this week doing nothing dramatic. The ones still running directional pipelines spent the week unaware they’re carrying a position.
You don’t get to know which side of the fork you were on until the road bends.
See you next Monday.
Chris Grimes is the founder of FundMore, an AI-native loan origination platform. FundMore builds agentic mortgage and lending infrastructure for institutional clients across Canada and the US.