The carpet has a bleach stain the size of a dinner plate, the bedroom walls smell like cigarettes, and you are holding a $2,000 deposit. Most landlords handle this moment badly in one of two directions. Some charge the tenant the full $1,800 replacement quote and lose in small claims, because the carpet was six years old and worth almost nothing on paper. Others eat the whole cost to avoid a fight, which on a small portfolio means giving away a few hundred dollars at every rough turnover.
The defensible middle is proration by remaining useful life. A tenant who ruins old carpet did not destroy new carpet; they destroyed the unexpired portion of an asset that was wearing out on a schedule. Judges apply that logic, insurance adjusters apply it, and the IRS applies the same idea when it lets you depreciate carpet over five years on Schedule E. This guide runs the math three times: young carpet, old carpet, and smoke-damaged paint.
The gate before any math: damage, not wear
Proration only enters the picture after you clear the first hurdle. As a general rule everywhere, normal wear and tear is your cost, not the tenant's, and no formula converts it into a deduction. Matted traffic lanes in a hallway, sun-faded fibers near a window, paint dulled by three years of ordinary living, a modest number of small nail holes: all of that is the cost of renting the unit out, and you priced it into the rent whether you meant to or not.
Damage is different in kind, not degree. Pet urine soaked into the pad, bleach or dye spills, cigarette burns, torn seams, crayon on the walls, smoke odor absorbed into the paint, an unauthorized purple accent wall. The line gets argued constantly, so I keep an item-by-item guide to wear and tear versus damage for the close calls. And none of it is provable without a dated baseline, which is what a signed move-in and move-out inspection checklist exists to create. No baseline, no delta. No delta, no charge.
The proration formula
Once you have genuine damage, the chargeable amount is not the replacement invoice. It is the value the tenant destroyed, which is the invoice scaled down by how much life the carpet or paint had already given you:
Charge = replacement cost × (useful life − age at move-out) ÷ useful life
Two of the three inputs are easy. Replacement cost is a real, like-for-like invoice, not an upgrade to the nicer carpet you have been wanting. Age comes from your installation receipt. Useful life is the input you have to be able to defend, and the most defensible number for mid-grade rental carpet is five years, because that is the recovery period the IRS assigns to carpet in a residential rental in Publication 527. Higher-grade carpet with a documented 8 or 10 year wear warranty can support a longer life if you bring the spec sheet. Interior paint runs shorter: two to four years is the range most courts and housing agencies work with, and three is a common midpoint.
Three worked prorations
Carpet, two years old, pet damage
Say the bedroom and hallway carpet went in two years ago, and the tenant's dog soaked the pad in two corners badly enough that replacement is the only fix. The like-for-like invoice is $1,800, and you are using the five-year life. Remaining life is three of five years, so the charge is $1,800 × 3 ÷ 5 = $1,080. You absorb the other $720, because two-fifths of that carpet's life was already spent before the dog ever walked on it.
Carpet, six years old, bleach stains
Same $1,800 invoice, but this carpet was installed six years ago. On a five-year life its remaining value is zero, so the defensible charge is $0, even though the tenant unquestionably caused the stains. The replacement was already due; it is a turnover cost, not a damage charge. Putting $1,800 on the itemization anyway is the fastest way to make a judge doubt every other line on it. The one honest exception: if you can document a premium carpet with an eight-year life, two years remain, and $1,800 × 2 ÷ 8 = $450 is arguable. Without the documentation, let it go.
Paint, one year old, smoke damage
Say the unit was repainted twelve months before move-out and the tenant smoked indoors for the whole year. A quote to seal and repaint the interior comes in at $1,200. Smoke odor bonded into the walls is damage, not wear; dull paint after a three-year tenancy would have been wear. On a three-year life with one year used, two years remain: $1,200 × 2 ÷ 3 = $800. If the painter itemizes a stain-blocking primer that exists only because of the smoke, you have an argument for charging that line in full, but prorating the whole job is the position that needs no argument.
Make the number survive a dispute
The difference between a charge that sticks and a charge that gets reversed is rarely the math. It is whether you showed the math. A line that reads “carpet replacement: $1,800” invites a challenge. A line that reads “carpet installed June 2024, five-year life, $1,800 invoice × 3/5 remaining life = $1,080” reads like accounting, and most disputes die when the tenant sees you can show your work.
- Prove the age. The installation invoice, dated move-in photos, and the asset record in your books are what stand between your five-year claim and the tenant's insistence that the carpet was ancient.
- Attach the replacement invoice. An estimate is weaker than a paid invoice, and a paid invoice for equivalent grade is strongest of all.
- Hit your deadline. Most state statutes give you somewhere between 14 and 45 days to return the balance with an itemized statement, and missing the window can forfeit your right to deduct anything. Read your state's statute and calendar it the day the tenant hands back the keys.
The full lifecycle of deductions, deadlines, and returns is covered in the security deposit guide for landlords, and when you are ready to send the statement, the deposit return letter template has the proration language built in. A round number reads like a grab. A worked number reads like a record.
The same five-year logic shows up on your taxes
The proration you defend at move-out and the depreciation you claim in April are the same schedule viewed from two sides. New carpet you install in a rental is a capital expenditure recovered over a five-year MACRS life, which is worked through in the carpet and flooring depreciation guide and in the depreciation calculator. Repainting between tenants, by contrast, is ordinarily a currently deductible repair. And any deposit money you keep for damage generally lands on your Schedule E as income, with the timing rules covered in when a kept deposit becomes taxable.
I self-manage my own small portfolio from two time zones away, and the reason I built rents.ai is that my spreadsheets kept dropping exactly this kind of multi-year detail: when the carpet went in, what it cost, how much life it has left. When you log a carpet replacement as a capital expense, it creates the improvement record and carries the depreciation into your Schedule E line 18 rollup, the same useful-life arithmetic this whole page runs on. What it will not do is tell you what your state allows you to deduct from a deposit, and its tax figures are estimates to organize your year for your CPA, not tax advice. The proration defense is still yours to make.
Deposit law is state-specific and this is not legal advice. Deduction limits, where the deposit must be held, the return deadline, and what a valid itemization requires all vary by state and sometimes by city, and a missed deadline can cost you the whole deduction. Read your state's statute or ask a local attorney. The tax treatment described here is an estimate to organize your year for your CPA, not tax advice.