Gross Rent Multiplier vs DSCR: Two Different Investor Metrics
Gross rent multiplier (GRM) is price divided by gross annual rent — a fast screening tool investors calculate themselves before ever talking to a lender. DSCR is net rent divided by PITIA, the actual ratio a lender uses to qualify the loan. A good GRM doesn't guarantee a good DSCR, because GRM ignores financing costs and expenses entirely.
NightYield Editorial
STR-DSCR research & underwriting desk
Published 2026-07-18
What each ratio actually measures
GRM is calculated as purchase price divided by gross annual (or sometimes monthly) rent. It's a comparison tool — a lower GRM relative to similar properties in a market suggests the price is more favorable relative to rent, all else equal. It takes seconds to calculate and requires no underwriting input at all: just a price and a rent figure.
DSCR is net operating rent divided by PITIA — principal, interest, taxes, insurance, and association dues where applicable. It requires knowing the actual financing terms (rate, term, loan amount) and the actual carrying costs, not just the purchase price. It's the ratio a lender computes to decide whether the property services its own debt.
| GRM | DSCR | |
|---|---|---|
| Formula | Price ÷ gross annual rent | Rent ÷ PITIA |
| Needs financing terms? | No | Yes |
| Needs expense data? | No | Built into PITIA |
| Used by | Investors, quick screening | Lenders, actual qualification |
| Comparable across markets? | Yes, roughly | Less so — rates and taxes vary |
Why a low GRM can still produce a weak DSCR
GRM says nothing about the interest rate, the down payment, property tax rate, insurance cost, or HOA dues — all of which directly determine PITIA and therefore DSCR. Two properties with an identical GRM can have meaningfully different DSCRs once actual financing and carrying costs are applied.
Using both, in the right order
GRM is useful precisely because it's fast — a way to screen a list of properties down to a shortlist before spending time on full underwriting math. DSCR is the ratio that actually determines whether the loan qualifies, so it belongs at the point where a specific property with specific financing terms is being seriously evaluated.
- Use GRM to screen a batch of listings quickly against local market norms.
- Shortlist the properties with the most favorable GRM relative to comparable rentals.
- Run full DSCR math — actual rate, actual taxes, actual insurance, actual HOA — on the shortlist.
- Let DSCR, not GRM, be the final gate before making an offer contingent on financing.
Key takeaways
- GRM is price over gross rent — fast, but blind to financing and carrying costs.
- DSCR is rent over PITIA — the ratio that actually determines loan qualification.
- Two properties with identical GRM can have very different DSCRs once taxes, insurance, and HOA are factored in.
- GRM is a screening tool; DSCR is the underwriting gate — use them in that order.