I bought my first house in Irvington when I was 23. It cost $118,000, and I was a teacher making about $40,000 a year, so I had to be honest with myself about every line of that budget. I have watched a lot of people skip that step since.
The pattern is almost always the same. Somebody finds a duplex on the east side for $220,000 that rents for $1,200 a unit. That is $2,400 a month, which clears the old 1% rule with room to spare. It looks like a solid deal on the back of a napkin. A year later they are putting their own money into the property every month and cannot work out where it went.
They did not get unlucky with tenants. The spreadsheet was wrong before they ever closed.
The tax reset is the one that gets people
This is the biggest miss in Marion County, and almost every new investor underwrites it wrong.
The mistake looks harmless. You pull the seller's current tax bill, drop it into your model, and move on. If the seller lived in the property, that number is close to useless to you.
Indiana limits property tax bills through what is called the circuit breaker. A homestead, meaning an owner's primary residence, is capped at 1% of gross assessed value. Other residential property, which includes a rental duplex, is capped at 2%. Commercial sits at 3%. These caps are in the state constitution, so a local rate increase cannot push a bill past them.
Marion County carries the highest certified gross tax rates of any county in Indiana. That detail matters more than it sounds. It means most Marion County properties bill right up against their cap instead of somewhere comfortably underneath it. So when a duplex stops being somebody's home and becomes your rental, the ceiling it bills against moves from 1% to 2%.
The deductions come off at the same time. For the 2026 assessment date the homestead standard deduction is $40,000, and the supplemental homestead deduction takes another 40% off whatever is left for taxes due and payable in 2026. Both are tied to the owner living there. Buy it as a rental and you lose both. (Source: Indiana Department of Local Government Finance, memo to assessing officials and county auditors, May 27, 2026.)
On a duplex assessed at $200,000, that is roughly the gap between a bill near $2,000 and a bill near $4,000. About $167 a month, quietly removed from a deal you may have underwritten at $300 a month of cash flow. I go deeper on how the county actually calculates this in our Marion County property tax guide.
There is some good news, and it is real but modest. SEA 1 from the 2025 session created a new deduction for property in the 2% cap category, which includes residential rentals. It runs 6% of assessed value for 2025 pay 2026 and 12% for 2026 pay 2027, climbing to 33.4% by 2030 pay 2031. County auditors apply it automatically, so there is no form to chase. It softens the jump. It does not erase it.
The new rule that can actually cost you money
This one took effect July 1, 2026, and I have not heard many people talking about it yet.
Under HEA 1210, signed in March 2026, if you are receiving the homestead standard deduction and the property stops qualifying because the use changed, you have 60 days to notify the county auditor. Miss it and you are liable for the additional taxes plus a civil penalty of 10% of what you owe. The legislature changed the word "may" to "shall," so the auditor no longer has discretion about it.
There is a second piece. If an auditor determines within three years of the tax due date that a property was not eligible for the homestead deduction, they must issue a notice for taxes, interest, and penalties, and include a 10% fine calculated on the total bill as if the deduction had never been applied.
Here is what that means for a small landlord. If you buy an owner-occupied duplex and let the old homestead deduction ride because your first-year tax bill came in pleasantly low, that is no longer a happy accident you got away with. It is a bill with a penalty attached, and it can reach back three years.
Old houses come with old-house bills
Indianapolis has genuinely good historic stock. 1920s bungalows, brick duplexes from the forties, block after block of it in Fountain Square, Bates-Hendricks, Garfield Park, and Irvington. I like these houses. I own one.
The trouble is what people budget for them. A generic 5% repair allowance comes from national advice, and national advice is averaging in a 2015 build in Phoenix.
What actually turns up on a pre-1960 Indy property: galvanized supply lines at the end of their life, clay sewer laterals with roots in them, a fuse panel or knob and tube wiring that your insurer will have questions about, and an HVAC system that has to survive a February cold snap and an August humidity stretch in the same year. None of these are monthly problems. They are the $6,000 problems that show up in a single phone call.
A zip code is too big a unit to underwrite
I did a whole podcast episode on this because it comes up constantly.
People pull rent and value averages for 46201 or 46203 and treat them as if they describe every house inside them. Those zip codes contain fully renovated blocks and they contain blocks with three boarded houses on them. An average across both describes neither.
What actually moves your return is smaller than a zip code. Which side of the commercial corridor you are on. Whether the block has owner-occupants living on it. How long the last three tenants stayed. Whether there is off-street parking, which matters more than people expect once it snows.
How to underwrite an Indy duplex in 2026
1. Model taxes at the 2% cap from day one
Not the seller's bill. Two percent of assessed value, then subtract the new 2% property deduction for the year you are actually buying in. If the deal only works using the seller's homestead number, you do not have a deal yet.
2. Reserve for the age the house actually is
On pre-1960 stock I would run 10% to 12% of gross rent for repairs and capital expenditures rather than 5%. Newer construction can sit closer to 8%. Vacancy at 6% to 8% covers a normal turn, including the two weeks you will spend painting between tenants.
3. Underwrite the boring version first
Run the deal with no rent increases, no renovation premium, and a full tax reset. If it still works, then go look at what a kitchen update or adding laundry hookups could do for it. Forcing value is real, and it is most of how I have made money in this market. It is just a bad thing to depend on before you own the building.
House hacking is the version I recommend most for a first deal. Living in one unit and renting the other means you keep a homestead deduction on the portion you occupy, you get owner-occupant financing terms, and you find out what the building really costs while somebody else covers most of the note.
The market is fine. The math is where people lose.
For what it is worth, the fundamentals here still look good. The median sale price across the 16-county central Indiana region was $323,250 in June 2026, up 1% year over year, and available inventory was up 14.9% compared to June 2025. More inventory and flat pricing is a reasonable setup if you are the one buying.
Indianapolis remains one of the better rental markets in the Midwest. Most people who lose money here did not buy into a bad market. They bought with a spreadsheet built for a different state.
If you want to run real numbers on a specific property, episode 62 of the podcast covers where I would buy in Indy by zip code, and the Roots team is happy to walk a deal with you line by line before you write an offer.
Frequently asked questions
Quick answers from this guide.
Do Indiana property taxes double when a home becomes a rental?
In Marion County they often come close. The circuit breaker caps a homestead at 1% of gross assessed value and other residential property, including a rental duplex, at 2%. Marion County has the highest certified gross tax rates in Indiana, so most properties bill up against their cap rather than below it. The homestead standard and supplemental deductions also come off when the owner stops living there.
What is the homestead standard deduction in Indiana for 2026?
For the 2026 assessment date it is $40,000, down from $48,000 in 2025. Under SEA 1 from the 2025 session it keeps stepping down each year and reaches $0 for the 2030 assessment date. The supplemental homestead deduction takes another 40% off the remaining value for taxes due and payable in 2026.
Is there a property tax deduction for rental property in Indiana?
Yes, and it is new. SEA 1 added a deduction for property in the 2% circuit breaker category, which includes residential rentals. It is 6% of assessed value for 2025 pay 2026 and 12% for 2026 pay 2027, rising to 33.4% by 2030 pay 2031. County auditors apply it automatically, so there is no application to file.
What happens if I keep the homestead deduction on a property I turned into a rental?
Under HEA 1210, effective July 1, 2026, you have 60 days to notify the county auditor once the property stops qualifying. If you do not, you are liable for the additional taxes plus a civil penalty of 10% of the amount due. An auditor who finds the property was ineligible within three years of the tax due date must issue a notice and include a 10% fine.
How much should I budget for repairs on an older Indianapolis rental?
On pre-1960 housing stock, plan on 10% to 12% of gross rent for repairs and capital expenditures rather than the 5% that generic national advice suggests. Newer construction can sit closer to 8%. Older Indy properties commonly need galvanized supply lines replaced, clay sewer laterals repaired, electrical panels updated, and HVAC that handles both extremes of a Midwest year.
Is Indianapolis still a good rental market in 2026?
The fundamentals hold up. The median sale price across the 16-county central Indiana region was $323,250 in June 2026, up 1% year over year, and available inventory was up 14.9% compared to June 2025. More inventory with flat pricing favors buyers. The risk in this market is underwriting error rather than the market itself.