FP&A & Financial Modeling3 min readUpdated September 2026

Cube vs. Mosaic for a Commercial Debt Advisory Shop

Cube suits a commercial mortgage brokerage whose principal already models deals in Excel, while Mosaic suits a shop consolidating several originators' pipelines. Either way, the forecast must adjust for the rate environment, because origination fees depend on closed deals and volume shifts as borrowers refinance and buyers underwrite differently when rates move.

Here's how Cube and Mosaic compare once rate sensitivity is the core forecasting problem, not an afterthought.

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Why deal volume tracks the rate cycle, not a steady trend

When rates are falling or expected to fall, refinancing activity tends to pick up as borrowers look to lock in better terms, while rising or uncertain rates tend to push origination volume down as fewer deals pencil out at the buyer's required return. A forecast built on a flat month-over-month growth assumption ignores this cyclicality entirely and will look wrong almost every quarter.

With the 10-year Treasury yield near 4.44%1, build your near-term pipeline assumptions off the current rate level and its recent trend, not off a multi-year average that smooths over exactly the cyclicality that actually drives your business.

Building a pipeline forecast around deal probability, not just deal count

A deal in early-stage discussion with a borrower carries a much lower probability of actually closing than one with signed terms and a lender committed, and treating every pipeline entry as equally likely to close will overstate near-term fee revenue. Apply stage-based conversion rates to each deal, refreshed against your own historical close rate by stage rather than a rule of thumb borrowed from a different market cycle.

Revisit those conversion rates whenever the rate environment shifts meaningfully, since a deal's probability of closing at a given stage isn't fixed, it moves with financing conditions the same way total deal volume does across the broader lending market.

Cube for a principal who already models pipeline and fees in Excel

If you or your team already track deal-level probability, expected fee, and closing timeline in a spreadsheet, Cube's approach of syncing that spreadsheet against your CRM or deal-tracking system keeps the model where it's understood, without forcing a rebuild inside a new interface during a period when deal flow is already unpredictable enough.

This tends to be the more natural fit for a smaller shop where the principal or a single analyst owns the pipeline model directly and wants it kept current without extra administrative overhead.

Mosaic for a shop consolidating multiple originators' pipelines

Once you have several originators each building their own book of business, a dashboard rolling up pipeline probability and expected fees across the whole team can surface which originators are carrying the shop's near-term revenue and which are light on deal flow. Confirm in a demo that Mosaic can track deal-level probability and fee structure with the granularity your specific deals need, since commercial debt deals vary enough in structure that a generic template may not capture the nuance.

A dashboard view also makes it easier to spot when total shop-wide pipeline is becoming concentrated in just one or two originators, which is a real business risk worth surfacing early rather than discovering it when someone leaves.

Building a rate-sensitivity scenario into the fee forecast

Run your annual fee forecast at more than one rate scenario, since a meaningful move in rates during the year can shift deal volume enough to change your revenue outlook materially even if your win rate on individual deals stays constant. A single-scenario forecast built at the start of the year tends to look stale within a quarter or two once rates move.

Share the range, not just a single number, with anyone relying on the forecast, whether that's a lender partner, a landlord, or your own compensation planning, so a rate move doesn't blindside decisions that were made assuming the baseline case would hold.

Use these checks to keep the fee forecast honest:

  • Run the annual fee forecast at more than one rate scenario, since a meaningful rate move can change deal volume even when your win rate on individual deals holds steady.
  • Apply stage-based conversion rates to each deal, refreshed against your own historical close rate by stage rather than a rule of thumb.
  • Set near-term pipeline assumptions from the current rate level and its recent trend, not from a multi-year average that smooths over the cycle.
  • Share the full range of outcomes with your team instead of one number, and revisit the scenarios once rates move meaningfully during the year.

Where Jirav fits a shop planning to add originators

Jirav's driver-based approach is useful when you're deciding whether to hire another originator, since that decision should be tested against realistic ramp-up time, a new originator typically takes months to build a productive pipeline, and against what rate environment you expect during that ramp period, not just against your current, possibly cyclically elevated, deal flow.

A hire that looks easily justified against today's strong pipeline can look considerably riskier once you model their ramp-up against a rate environment that's already showing signs of turning, which is exactly the scenario a driver-based model is built to surface.

Executive Capability Standard

What Good Looks Like

A well-run mortgage brokerage forecasts fee revenue off a stage-weighted pipeline tied to current rate conditions, with conversion rates that get revisited as the rate environment shifts rather than left static for years.

Building The Capability (5-Stage Skill Ladder)

1. Learn:Learn how your current pipeline forecast weights deals by stage, and whether conversion rates have been updated since the last meaningful rate move.
2. Do Manually:Build a spreadsheet applying stage-based conversion rates to pipeline fees, tied to a documented current-rate assumption, updated monthly by hand.
3. Delegate:Assign an office manager or analyst to own the monthly pipeline review and flag deals stalled longer than your historical norm for that stage.
4. Automate:Sync CRM or deal-tracking data into Cube or Mosaic so stage-weighted pipeline and fee forecasts update without a manual reconciliation each month.
5. Buy:Standardize deal tracking and forecasting on one connected platform so hiring decisions for new originators reflect realistic ramp-up against current rate conditions.

How to Get Started

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Frequently Asked Questions

Should a mortgage brokerage forecast fee revenue off a flat annual growth rate?

No. Origination volume tracks the rate environment closely enough that a flat growth assumption will miss in either direction depending on which way rates move. Build the forecast around current rate conditions and a stage-weighted pipeline instead of a steady trend line.

How should conversion rates from early-stage deals to closed deals be set?

Use your own historical close rate by deal stage, refreshed periodically, rather than a fixed industry assumption. Conversion rates shift with the rate cycle, since deals are more likely to fall through in a volatile or rising-rate environment than a stable one.

Do Cube or Mosaic predict where interest rates are headed?

No, neither tool forecasts rates. They help you build scenarios around different rate assumptions you provide, but the rate view itself, and how much weight to put on each scenario, is a judgment call for you and your team to make.

Sources

Where we quote a benchmark, we show its source. Other figures in this guide are estimates or general guidance, so check them against your own numbers.

  1. 10-year US Treasury constant-maturity yield. Federal Reserve H.15 Selected Interest Rates, 2026.

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