Ask how much to raise rent and the internet hands you the same answer: 3 to 5 percent. That number is a national average dressed up as a decision. It says nothing about whether the tenant in your unit, in your zip code, at your price point will pay the new rate, shrug, or hand you a thirty-day notice and leave you repainting in February.
A rent raise has a lopsided payoff. The upside is measured in tens of dollars per month. The downside, if the raise pushes a good tenant out, is measured in thousands: a vacant month at the new rent plus a turnover. The useful question is not what the average landlord does. It is how many months of the higher rent it takes to recover one bad outcome.
Where 3 to 5 percent comes from, and what it misses
The standard advice exists because it loosely tracks inflation plus the cost growth a landlord actually eats: property taxes, insurance, maintenance labor. In a normal year a 3 percent raise keeps rent moving with the market without startling anyone, and a raise above 5 or 6 percent starts to read as an invitation to compare listings.
What the rule misses is that both inputs are local and personal. Say your unit rents for $1,500. If the property tax bill went up $420 this year and the insurance renewal came in $360 higher, your costs rose $780, which is $65 a month. A 3 percent raise is $45. In that year, the textbook raise is a pay cut. In a different year, with flat costs and a soft market, that same $45 might be more than the neighborhood will back. The percentage is the output of the decision, not the input.
The break-even math on a raise
Here is the calculation that should sit under every renewal letter. Say the unit rents for $1,500 and you raise it $100, to $1,600. If the tenant stays, you collect an extra $1,200 a year. Good outcome, and the likely one if the new rate sits at or under market.
If the raise is the nudge that makes the tenant leave, count the cost. One vacant month at the new rent is $1,600 of income that never arrives. Divide that by the $100 you were chasing and the raise needs 16 months of the higher rent before you are back to even, and that assumes you re-rent at $1,600 after exactly one month with zero turnover spend. Nobody turns a unit for zero. A light turnover, touch-up paint, cleaning, a few small repairs, your own hours running showings, comes to around $1,800, and the all-in cost of a turnover is routinely worse. Now the hole is $3,400 and the break-even stretches to 34 months, longer than the next two 12-month leases combined.
Break-even months = (vacancy loss + turnover cost) ÷ monthly increase
Run it before you send the letter. If the answer comes back longer than you honestly expect the next tenant to stay, the raise is not income. It is a vacancy with a delay.
Two numbers to pull before you pick a number
- Market rent for your specific unit. Pull three to five comps that actually match: same beds and baths, same rough condition, same block or school zone, listed in the last 60 days. A three-bed listing across town says nothing about your one-bed over a garage. The method is covered in how to find rent comps. If you sit 8 or 10 percent under those comps, you have room. If you are already at the top of them, a raise is a bluff the market will call.
- Your own cost growth on that unit. The tax bill, the insurance renewal, and what maintenance actually cost over the trailing twelve months. A raise that fails to track your cost growth means the unit pays you less every year while looking the same on paper.
Where the two disagree, the market wins. Your costs explain why you want a raise. Only the comps say whether you can have one.
Raising rent on a good tenant
A tenant who pays on time, reports the small leak before it becomes the ceiling stain, and treats the place like their own is worth a discount, and you can size it instead of guessing at it. Keeping a good tenant $50 under market costs you $600 a year. One turnover, on the math above, costs about $3,400. The discount can run more than five years before it costs what a single move-out costs in one spring.
The mistake is converting that discount into skipped raises. Hold rent flat at $1,500 for three years while the market grows 4 percent a year and market rent reaches roughly $1,687. Now you need a $187 catch-up, a 12.5 percent raise in a single letter, which lands as an insult after three quiet years and is the most reliable way to turn a long-term tenant into a former one. Small and annual beats large and overdue: a $30 to $45 bump each year, 2 to 3 percent on that unit, keeps you inside the discount band without ever writing the scary letter. Pair the number with a renewal they can sign early; the lease renewal letter has its own playbook. Cheap rent is a gift you give once a year on purpose, not a habit you discover three years in.
When the right raise is zero
Some years the math says to leave the number alone. Skip the raise when any of these is true:
- You are already at or above market. The comps are the ceiling. A raise past them converts a paying tenant into a listing.
- The lease ends in a cold season. A unit that goes vacant in December in a northern market can sit until March. Three vacant months at $1,600 is $4,800, which no $100 raise recovers on any timeline you will enjoy.
- The unit owes the tenant work. Asking for more while the bathroom fan still rattles invites a comparison shop you will lose. Fix first, raise second.
- One vacant month would genuinely hurt. If your reserves are thin, the downside of the bet is bigger for you than the math alone shows.
The opposite case exists too. A tenant you would not choose again, chronically late, hard on the unit, gets priced at full market, and the decision becomes theirs. That is portfolio management, not punishment.
Notice, the letter, and what the law allows
Two rules of mechanics before any of this leaves your desk. First, a fixed-term lease locks the rent for its term: no mid-lease raise unless the lease itself contains a clause allowing one, which most residential leases do not. The raise happens at renewal. Second, a month-to-month tenancy can be raised with written notice, commonly 30 to 60 days, and some states require more for larger increases. Cities with rent stabilization cap the size of the increase itself. Read your state statute and your local ordinance before you pick a number, because the rules live at the state and city level.
On timing, send the new rate 60 to 90 days before the lease ends. The tenant gets a real window to decide, and you get an answer early enough to list the unit while the current tenant still lives in it. The letter itself should state the new amount, the effective date, and not much else; the rent increase letter template has a friendly version and a formal one.
Notice periods, caps, and rent-stabilization rules vary by state and city and change often. This is general information, not legal advice. Check your state statute and local ordinance before sending a rent increase.
Decide from a rent roll, not a rule of thumb
Every input this decision needs is a number you can have in front of you: current rent per unit, the trailing year of expenses, the comps, and the lease end date. I self-manage my own small portfolio from two time zones away and close the books on the 5th of each month, so by the time a renewal comes up, three of the four numbers are already sitting there and the decision takes minutes. A rent roll template gets you the first column, and the wider system around it, methods, tracking, late rent, is the subject of the guide to collecting rent as a small landlord.
I built rents.ai because my spreadsheet kept dropping exactly these inputs. It holds the rent roll next to your actual expense history and shows lease expirations coming due on the dashboard, which is the moment this decision actually happens. It will not tell you what market rent is, though: market rent there is a number you type in per unit, so the comps work above is still yours to do. The average is what other landlords did. The break-even is what your unit will do. Price from the second one.