DSCR Loan Pricing Calculator
How a private lender replaced spreadsheet-based loan pricing with a Zoho Creator engine that prices a deal in seconds and lets staff update rate sheets without a developer.
Client details generalized to protect confidentiality.
Private or hard money lenders pricing loans in a spreadsheet, especially where rate sheets change monthly and only one person understands the formulas.
The Challenge
Loan pricing lived in a spreadsheet only two people fully understood. Every quote meant looking up the current rate sheet, applying FICO and transaction type adjustments by hand, then checking prepayment penalty rules separately. Rate sheets changed often, versions circulated by email, and a quote built from last month’s sheet was not obviously wrong until it reached underwriting.
The Solution
DSCR and Coverage Calculation
Rent, expenses, and debt service feed a single calculation that returns the coverage ratio and whether the deal clears the program minimum.
- Creator form with computed DSCR field
- Program minimum stored per loan product
- Instant pass or fail flag on entry
- Validation on required inputs
Rate Adjustments by FICO and Transaction Type
Base rate is adjusted through a stacked set of add-ons rather than a single lookup, so purchase, refinance, and cash-out each price correctly.
- Rate matrix by FICO band and LTV
- Transaction type add-on table
- Stacked adjustment order preserved
- Final rate written back to the record
Prepayment Penalty Logic
Penalty structure is selected as part of pricing, and the option chosen adjusts the rate rather than sitting in a footnote.
- Penalty structures as selectable options
- Rate impact per structure
- Step-down schedules calculated
- Terms carried into the quote output
Admin Rate Sheet Control Panel
Staff update rate sheets, add-ons, and program minimums through an admin screen, so a pricing change does not require a developer.
- Admin-only editable rate tables
- Effective date on each rate sheet
- Historical sheets retained
- Change log by user
Apps in This Solution
Under the Hood Technical detail
- Application Structure
- Rate sheets, adjustment tables, and program parameters are stored as data in their own Creator forms rather than as constants in script. That single decision is what makes the admin panel possible and is the difference between a calculator and a maintainable pricing engine.
- Calculation Order
- Adjustments stack in a defined sequence: base rate by program, then FICO and LTV band, then transaction type, then prepayment structure. Order matters because the adjustments are not commutative once floors and ceilings apply, so the sequence is enforced in one function rather than spread across form rules.
- Versioning
- Every rate sheet carries an effective date and prior sheets are retained rather than overwritten. A quote issued last month can be reproduced exactly, which is the answer to the question that always eventually comes up in a dispute.
- Access Model
- Admin roles edit rate tables, loan officers only consume them. The pricing screen is read-only against the tables, so no one can adjust an add-on mid-quote to make a deal work.
- Notable Constraint
- Exceptions are real in private lending. Rather than blocking off-program deals, the engine flags them and requires an exception note and approval, so exceptions stay visible in reporting instead of being buried in a manually edited rate.
The Results
- Pricing a deal moved from a spreadsheet exercise to a single screen.
- Rate sheet updates are handled by staff without developer involvement.
- Any historical quote can be reproduced from the rate sheet that was in effect.
Pricing Loans in a Spreadsheet?
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