In short: Once the decision to rent out your first home is made, a second, less obvious set of numbers takes over. The insurance policy has to change, the security deposit you're allowed to collect is capped by California law, and the rent has to cover more than just the mortgage. Most of that math looks negative every month, and that's normal. The real payoff isn't a monthly check. It's the low interest rate you get to keep, the equity that keeps building whether or not you notice, and the home value that keeps climbing in the background.

James and Nora bought their two-bedroom condo in Pasadena in 2020, back when a 3.1 percent rate barely registered as remarkable. Six years later, a job took Nora's career to the Bay Area, and neither of them wanted to sell a place with that rate attached to it, especially with no certainty the move is permanent. Renting it out felt like the obvious answer. What they hadn't worked out yet was what actually changes, on paper and in practice, the moment a home they've lived in becomes a home someone else pays rent to live in.

The Costs Nobody Mentioned When They Bought

The mortgage doesn't change. Almost everything wrapped around it does.

Their homeowner's policy was built for someone living in the unit, so it doesn't cover a tenant-occupied home the same way. Landlords typically switch to what's called a dwelling-fire policy instead, coverage built specifically for a home you own but don't live in. It usually costs about 25 percent more. Against a base condo policy of around $900 a year, that puts their landlord coverage closer to $1,125, about $93.75 a month. In exchange, the new policy adds something their old one didn't: coverage for lost rent if the unit ever becomes unlivable.

Their property tax bill is the one number that doesn't move. In California, a home only gets reassessed to a higher value when it's sold to a new owner, not when the same owner starts renting it out. So the condo's assessed value keeps climbing under the same slow, capped pace it always has, about $585,604 today against their original $520,000 purchase price, which works out to roughly $536.80 a month. That's a real advantage, and one they'd lose entirely if they ever sold this condo and bought a different rental instead, since a new purchase starts the clock over at full price.

What the Rent Actually Has to Cover

Comparable condos in their part of Pasadena rent for somewhere around $2,750 a month. Set against everything the unit actually costs to carry, the picture looks like this:

The HOA line is doing real work here. It already covers the roof and the building's exterior, the kind of thing a stand-alone house would need a much bigger repair fund to cover on its own, which is why that reserve is smaller than it would be for a detached home. Even so, the condo runs about $900 negative a month, roughly $10,800 a year, before either of them collects a first rent check or fixes anything inside the unit.

So Why Keep It At All?

A number like -$899.82 raises the obvious question: why do this at all?

Because that monthly shortfall isn't the whole picture. Three things are quietly working in James and Nora's favor at the same time, even while the bank account shows red every month.

First, part of that mortgage payment isn't really a cost. Every month, a slice of the $1,998.44 goes toward paying down the loan itself, which means James and Nora own a little more of the condo than they did the month before. That slice of money doesn't disappear. It moves from their bank account into their own equity.

Second, they get to keep 2020's interest rate. A loan like theirs would cost close to double at today's rates. Every month they hold onto it, they're holding onto a discount most buyers can't get anymore.

Third, the condo is already worth about $100,000 more than they paid for it, and that gain doesn't need a sale to be real. It just sits there, growing quietly, whether the monthly cash flow is positive or not.

Put together, the $899.82 a month James and Nora are covering out of pocket works less like a loss and more like a membership fee, one that buys them all three of those advantages at once. Whether that fee is worth paying depends on how long they plan to hold onto the condo, which is really the question underneath everything else in this article.

The Deposit They Can Actually Ask For

The first real surprise most new landlords in California run into isn't the cash flow. It's how little they're allowed to ask a tenant to put down upfront.

Since July 2024, under a state law called Assembly Bill 12, most California landlords can collect no more than one month's rent as a security deposit, with pet deposits and any other deposit folded into that same single cap. That's a sharp drop from the two or three months' rent landlords could once charge. There's one exception: an owner of two or fewer rental properties, totaling four or fewer units, can still collect up to two months' rent. James and Nora, with exactly one rental property, qualify for that exception and could ask for up to $5,500 instead of $2,750, though many small landlords stick with the lower amount to keep the unit competitive. A related law now also requires photo or video proof of the unit's condition before a tenant moves in and after they move out, with an itemized list of any deductions sent within 21 days of move-out.

The Loss That Looks Bigger on Paper Than in the Bank Account

Here's where the math stops matching intuition. The condo runs about $899.82 negative a month in actual cash, but the loss the IRS sees on paper is considerably bigger, because of a deduction that never touches their bank account at all: depreciation.

The IRS lets landlords deduct a portion of a rental property's value every year for 27.5 years, a rule called depreciation. The deduction is based on what the condo was worth, for tax purposes, at the moment it became a rental, not whatever it might sell for today. For James and Nora, that number comes to $528,000, their original purchase price plus closing costs. About 85 percent of that, or $448,800, counts as the building rather than the land, since only the building itself can be depreciated. Divide that by 27.5 years, and they get to deduct $16,320 a year, about $1,360 a month, whether or not they actually spend a dollar on anything that month.

Add that $16,320 deduction to the mortgage interest, taxes, insurance, HOA dues, and management fees, and the condo shows a loss of about $15,858.88 for the year on Schedule E, the tax form where rental income and expenses get reported. That's a bigger loss than the roughly $10,800 in real cash the condo actually costs them over the year. The extra $16,320 isn't money leaving their pocket. It's the depreciation deduction doing exactly what it's designed to do.

Whether That Loss Actually Helps Them

A loss on paper only helps if the tax code actually lets you use it, and this is where a lot of first-time landlords get a surprise.

By default, the IRS treats a rental loss as something that can only offset other rental or investment income, not a regular paycheck. There's one exception: an owner who's actively involved in running the property, meaning they're the one approving tenants and repairs even if a property manager handles the daily work, can use up to $25,000 of rental losses to lower their regular taxable income each year.

That $25,000 allowance shrinks once household income passes $100,000, and disappears completely above $150,000, no matter how large the actual loss is. James and Nora are a two-income couple moving for a Bay Area job, so their combined income likely sits well above that $150,000 line. That means their $15,858.88 loss can't reduce James's or Nora's paycheck taxes this year at all. Instead, it gets saved for later, carried forward until they have other rental profits to offset it against, or until they eventually sell the condo.

If a new mortgage ever enters the picture, whether for a home in the Bay Area or somewhere else, this condo's rent would face its own separate approval rules with a lender, a topic we've walked through in detail in what to actually do with your first home when you move up, including how much of the rent a lender actually counts. And the instinct to protect a rate like theirs isn't unique to this decision either. We've covered the broader version of it in what happens to homeowners who locked in a mortgage rate years ago and don't want to give it up.

Weighing It Honestly

None of this makes James and Nora's plan a bad one. It means the case for it rests on the right things: a rate worth protecting and roughly $214,380.81 in equity that keeps building through paydown and appreciation, whether or not this year's cash flow cooperates. It doesn't rest on a tax write-off, since that part isn't actually available to them yet.

The version of this decision worth trusting adds it all up at once: a rental running about $900 negative a month, a paper loss north of $15,000 that has to wait its turn to matter, a security deposit rule that limits how much cushion they can collect against a bad tenant, and an insurance bill higher than the one they're used to. That's a real monthly and administrative commitment, not free money showing up while nobody's watching. Whether it's worth it comes down to one thing: how long James and Nora expect to be gone, and how much that rate, and this specific condo, are actually worth holding onto for.

Quick Check: Turning Your First Home Into Your First Rental

About the author: I'm a licensed real estate agent practicing in California. This article is part of NITU Path, Chapter 7, a series written to walk buyers through their entire homeownership journey.

This article is for general informational and educational purposes only and is not tax, legal, or financial advice. Tax rules, landlord-tenant law, and insurance requirements vary by situation and change over time. Consult a licensed tax professional, attorney, or insurance agent about your specific situation.

Sources:

• IRS Publication 527, Residential Rental Property

• IRS Publication 925, Passive Activity and At-Risk Rules

• California Legislative Information — Assembly Bill 12 (2023-2024)

• California Legislative Information — Assembly Bill 2801 (2023-2024)

• Hippo — What is a DP-3 Insurance Policy?

• Zillow — Average Rental Price in Pasadena, CA

• Rocket Mortgage — Historical 30-Year Fixed Mortgage Rates