How to calculate DSCR: the formula, worked examples, and what counts

The formula is one line:

DSCR = monthly rent ÷ monthly PITIA

PITIA is the full monthly cost of the loan: principal, interest, taxes, insurance, and any HOA or association dues. A property renting for $1,700 with a $1,360 total payment has a DSCR of 1.25. That's the entire calculation. The rest of this post is what goes into each number, the convention that trips people up, and what lenders consider a good result. Or skip the arithmetic entirely: the DSCR loan calculator runs it from your rent, price, and rate.

Walking through a real example

Take a $215,000 single family with 25% down at a 7% rate on a 30-year fixed.

Loan amount: $161,250. Principal and interest: $1,073. Property taxes: $200/month. Insurance: $100/month. No HOA. Total PITIA: $1,373.

The property rents for $1,700.

$1,700 ÷ $1,373 = 1.24 DSCR. The rent covers the payment with roughly 24% to spare. Most lenders approve this deal, and it sits a rounding error from the 1.25 threshold where pricing improves. That's worth knowing before you apply, because a slightly larger down payment would tip it.

What counts in the denominator (and what doesn't)

PITIA includes: principal, interest, property taxes, insurance premiums, HOA dues. It does not include: property management fees, maintenance, vacancy allowance, utilities, or capital reserves.

That surprises people, because those costs are real. They belong in your investment analysis (every Lineage pro forma deducts them), but they are not in the lender's DSCR calculation. The ratio only asks whether the rent covers the debt. You still have to ask whether it covers everything else, with margin left over.

The gross-vs-NOI trap

You'll find two DSCR definitions in the wild, and they give different answers for the same property.

DSCR loan programs underwrite on gross monthly rent ÷ PITIA. Commercial real estate and the finance textbooks use net operating income ÷ debt service, which subtracts operating expenses first and produces a lower ratio.

Neither is wrong. They're different tools. But if you calculate the NOI version and your lender calculates the gross version, you'll think your deal is weaker than they do. When someone quotes you a DSCR, ask which convention they're using. When a residential DSCR lender quotes one, it's gross rent.

What's a good DSCR?

Below 1.0. The rent doesn't cover the payment. A few lenders will still do it, at higher rates and more down, but as an investment you're subsidizing the property every month. Treat that as your answer.

1.0 to 1.24. Qualifies with most lenders. Workable, with thin margin. One rent dip or tax reassessment eats the cushion.

1.25 and up. Where better pricing starts and where most experienced investors aim. The rent covers the payment with a real buffer.

1.5 and up. Comfortable, and usually a sign of a strong rent-to-price market rather than luck. The trade-off tends to be slower appreciation. Ratios like this come from picking the right market.

The calculator shows which band your deal lands in, and the maximum loan the rent supports at both 1.0 and 1.25.

How to raise a DSCR

Only three inputs move the ratio. Put more down (smaller loan, smaller payment). Get a lower rate or buy it down with points. Or find more rent, which usually means a different property rather than wishful comps. Everything else about you and your finances leaves the number where it was. The fastest way to test all three is the calculator: change an input and watch the ratio move.

This is also why the ratio is worth respecting. A lender approving your DSCR loan is independently confirming the deal math works (here's how DSCR lending works at Lineage). If you have to strain to get to 1.0, that's the deal talking. The full requirements list is here, and here's how DSCR loans work end to end.

Examples are illustrative. Actual rates, taxes, insurance, and rents vary by property and market. This is educational content, not financial advice.