St. Louis real estate investing: where the 1% rule still works

Where the cheap-house pitch breaks

St. Louis sells on price. You can still buy a rentable house here for under $150,000, and the median home sold for $259,828 in the three months ending August 2026, up 4.8% from a year earlier, in 21 days at 99.2% of list, per Redfin. Every out-of-state cash-flow pitch stops right there.

Here is the line the pitch drops. The city lost people. St. Louis had 278,144 residents as of July 2025, down 7.7% from 2020, according to the Census Bureau. A market where houses are cheap because the population is leaving is a different bet from one where houses are cheap and the place is filling up. Both get sold with the same brochure.

One note before the math. This is general information, not tax, legal or investment advice. Rates and rules change, so confirm every figure here with the St. Louis Assessor, the Missouri State Tax Commission and a CPA before you write an offer.

The numbers that anchor a St. Louis deal

Start with sources that are not trying to sell you a house. Five of them frame the whole analysis.

Two more Census lines change how you read the rest. St. Louis owns its homes at just 45.3%, the lowest owner rate of any market in this city series, so more than half of all households rent. That is a deep tenant pool. It sits next to a median household income of $56,160 and a poverty rate of 20.6%, the highest in the series, which is the other half of why the rent-to-price ratio looks generous on a listing site and why collections and turnover bite once you own the place.

City vs county: the line that decides the deal

The single most common mistake made about this market is treating "St. Louis" as one place. It is two. The City of St. Louis is an independent city, not part of St. Louis County, with its own assessor, its own levies and its own 1% earnings tax. St. Louis County is a separate government of about a million people that the city left in 1876. A syndicator quoting metro-wide appreciation is averaging a shrinking core with growing suburbs and handing you the blended number.

Watch what the averaging hides. A $90,000 house on a north-city block that lost a fifth of its residents since 2020 and a $260,000 house in a stable county suburb both sit inside "St. Louis metro" price data. The first can run 20% vacancy and still show up in a cheerful median. Buy the metro headline and you can close on the wrong side of a line drawn in 1876. Pull block-level occupancy and rent, not the citywide figure, before you believe any pro forma.

The 1% rule actually works here, on the right house

In most 2026 markets the 1% rule is dead. Run it on the St. Louis city median and it looks dead too: 1% of $259,828 is $2,598 a month, and the typical three-bedroom asks $1,695, about 0.65%. That is the number that makes people write off the whole city.

They are reading the wrong price. St. Louis has a deep supply of sound houses under $150,000, and that is where the ratio lives. A $130,000 rehabbed three-bedroom renting for $1,300 is exactly 1.0%. A $115,000 house at $1,200 clears it. The rule is reachable here in a way it simply is not in San Antonio or Charlotte, where even lower-price stock stays under it. Commit to the real line: below roughly $150,000 St. Louis rentals meet the 1% rule regularly, and at or above the city median they almost never do. The yield is real. It lives below the median, not at it.

Missouri property tax and the 19% assessment

Property tax is where St. Louis quietly beats the Sun Belt. The Tax Foundation puts Missouri's effective property tax rate on owner-occupied housing at 0.89%, against 1.40% in Texas and 1.21% in Kansas next door. On a $130,000 house, 0.89% is about $1,157 a year, or $96 a month. That single gap is worth more to a small landlord than most of the tricks in a guru course.

Know the mechanic so an assessment notice does not surprise you. Missouri assesses residential real property at 19% of market value, then applies the local levy to that assessed figure, and the St. Louis Assessor reassesses in odd-numbered years such as 2025 and 2027. There is no cap that resets against you when you buy, the way Texas and Florida treat rentals, and that absence is a genuine advantage. Appeal in a reassessment year anyway. A won protest is the cheapest cash flow you will ever add to a Missouri deal.

The 1% earnings tax nobody prices in

The city carries a tax the suburbs do not. St. Louis levies a 1% earnings tax on residents' wages and on non-residents who work inside the city limits, and voters renewed it in April 2026 for another five years, per the Collector of Revenue and St. Louis Public Radio. It is charged on wages and business net profits, not on an individual owner's passive rent, so it will not usually land on your rental income directly.

It still touches your deal from two sides. It trims the take-home pay of the tenant pool you are renting to, which caps what a city renter can afford before you set the rent. And it can reach a rental you run as an active business inside the city, depending on how you structure it. A property held in a county suburb avoids the tax entirely. Ask a Missouri CPA how your entity and location interact before you assume it does not apply to you.

A monthly pro forma, line by line

Put every line on the page, because the slogans hide inside the gross. Here is one $130,000 St. Louis rental at a $1,300 rent for a three-bedroom, financed with 25% down at a 30-year rate near 7%. Change the reserve percentages if your block runs different. The shape holds.

The rate is not a guess. Freddie Mac's survey put the 30-year fixed at 7.03% for the week ending September 24, 2026. Read the bottom line, then read the contrast. Financed, this house clears about $91 a month. Pay cash and it throws off roughly $742 before debt, a cash-on-cash return near 6.8% on $130,000. Now run the city median instead: a $259,828 house at the $1,695 market rent, financed the same way, bleeds about $362 a month. Same city, same loan, opposite result. The cash flow in St. Louis is a function of buying below the median, not of the market doing you a favor.

The jobs are downtown. The decline is on the blocks

The investment story is not all shrinkage. The National Geospatial-Intelligence Agency opened its new western headquarters in north St. Louis on September 26, 2025, a $1.75 billion, 97-acre campus that officials called the largest federal investment in the city's history, anchoring an agency that employs roughly 3,100 workers. Boeing builds fighter jets on the county line and BJC HealthCare and Washington University anchor the region's payrolls.

Hold that against the population line. The city still shrank 7.7% while the campus was being built. A federal headquarters lifts a corridor over a decade, through spillover jobs and slow reinvestment. It does not fill a vacant fourplex three miles north of it next month. Treat the NGA campus as a reason a north-side block might be a safer ten-year hold, never as a reason to pay up for a vacant building on the promise of a boom that has not reached the census yet.

Neighborhood tiers, without the hype

Be suspicious of any page that lists ten St. Louis neighborhoods with no numbers attached. That is a page written to rank, not to help. Reliable per-neighborhood price and rent tables from one primary source do not exist, so read the city in tiers and confirm every deal with real comparables.

The stable tier runs through the south side and the inner county suburbs, where houses clear the city median, tenants stay and the 1% rule rarely holds. The middle is the transitional band near the central corridor, where price has caught up to rent. The high-gross-yield tier is the north side and the older east blocks, where sub-$120,000 houses make the ratio look best on paper and where vacancy, older roofs and collections do the most damage in practice. Insurance is rising underneath all three: a 2025 Federal Reserve FEDS Note found the average monthly insurance cost per rental unit rose from $39 in 2019 to $68 in 2024, and landlords absorbed most of it. Pull your own comps before you trust any tier, and score one zip at a time, the way Farmrix ranks owners, so you are comparing blocks that behave alike instead of averaging three that do not. Our guides on running comps and calculating ARV walk through the method a lender will accept.

Find the deal before it lists

The margin in St. Louis is in acquisition and in block selection, because the MLS is where you pay the city median for a sub-1% yield in a place that is losing residents. The investors who make it work buy below the median, off-market, from owners who want out before they list. That is where a ranked, mail-first approach earns its keep. Farmrix scores every owner in a St. Louis zip on how likely they are to sell in the next 6 to 12 months, ranks them, and prints and mails postcards to the top of that list, so your first call is with a seller already leaning toward the door instead of a bidding war on a retail listing. Pair it with clean owner data and you are underwriting a specific block, not a citywide average. The smallest package is 500 ranked owners and 500 postcards for $1,195, with data, printing and postage included.

Do three things before your next St. Louis offer. Confirm which side of the city-county line the house sits on, because the tax and the earnings-tax exposure change with it. Build the pro forma below the median, since that is the only price band where the 1% rule holds here. Then source the deal off-market, because a house bought at the retail median, in a city shedding residents, is not a cash-flow play. It is a discount you paid full price for.