Four questions, three worked examples, and a note on how the tax treatment differs, so the next expensive call is easier.
A tenant reports that the water heater is leaking again. You paid a plumber to fix it eighteen months ago. Now he's quoting another repair, and you're wondering whether you're throwing good money after bad.
Repair or replace is one of the most expensive decisions a self-managing landlord makes, and it usually happens under pressure. This post gives you a simple framework you can run in a few minutes, a couple of worked examples, and a note on how the tax treatment differs. (It builds on the spending-limit idea in What a Good Maintenance Action Plan Looks Like, since part of every plan is knowing in advance how much a vendor can spend before checking with you.)
Commonly cited ranges are roughly 8–12 years for a tank water heater, 15–20 for a furnace, 10–15 for central air conditioning, and around 10 for a dishwasher. These are rough guides, not guarantees. An item in the last third of its life is a stronger candidate for replacement.
A common rule of thumb: if the repair costs more than about half the price of a replacement, and the item is past the middle of its life, replace it. Get a written quote for both so you're comparing real numbers.
A second repair on the same item within a year or so usually means more are coming. Repeat failures cost you money, and they cost your tenant patience.
Think about safety, tenant disruption and collateral damage. A heating failure in winter or a leaking tank has consequences beyond the part itself. A dripping faucet doesn't.
If three or four answers point the same way, the decision is usually clear. When they split, lean toward the option that reduces risk to the tenant and to the property.
The third example is the one that trips people up. The math doesn't say "replace today," but the risk and trend do say "plan to." The framework gives you a decision, and also tells you when to start setting money aside.
In general, tax rules treat a repair that keeps something in working order differently from an improvement or replacement that adds value or extends its life. Repairs are typically deducted in the year you pay for them, while larger replacements are often capitalized and depreciated over time. There are exceptions and thresholds, such as safe harbors for smaller purchases. The details depend on your situation, so ask your accountant before a big replacement, and keep the invoice and a written note of what was done and why.
For a major repair or replacement, one quote isn't a comparison. Get at least two, and make sure they cover the same scope, brand and warranty. Having a vendor bench in place ahead of time, as covered in How to Build a Reliable Maintenance Vendor Network, means you can get these quickly instead of searching while a tenant waits without hot water.
When a request comes in, Guardian's AI action plan gives you a first read: urgency, likely cause, suggested next steps and recommended vendors or service reps from your own list, plus a pre-drafted message to the tenant. That first draft helps you spot the repeat problem and get quotes in motion. You review and approve it, with a real person making the final call, and your full request history shows what's been fixed on a property before. Costs can be tracked through expense reporting, so you can see the real total spent on an aging item. If you're away, Away Mode (Starter and above) has Guardian's team coordinate the response, with a full record of what happened.
A common rule of thumb is to replace it if the repair costs more than about half the price of a new one and the item is past the middle of its expected life. Repeat failures, safety risk and the cost of the item failing, such as a heating failure in winter, all push toward replacement.
Commonly cited ranges are about 8–12 years for a tank water heater, 15–20 for a furnace, 10–15 for central air, and around 10 for a dishwasher, though this varies by quality, maintenance and use. Treat them as rough guides.
In general, repairs are deducted in the year you pay for them, while larger replacements are often capitalized and depreciated over several years, with some exceptions for smaller purchases. The rules depend on your situation, so ask a tax professional and keep the invoice and a note of what was done.
Guardian Landlord gives you an AI-drafted action plan for every request, plus request history and expense reporting. Away Mode covers you on Starter and above. Try it free for 3 months.
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