Of all the fine print in a homeowners or renters policy, few clauses matter as much at claim time as whether your coverage is written on a replacement cost or actual cash value (ACV) basis. Two policies with identical coverage limits can produce very different payouts for the exact same loss, depending on which one applies.
Actual cash value: what it was worth right before the loss
ACV policies calculate a payout based on the depreciated value of the damaged item or structure component at the time of loss — factoring in age and wear. A 12-year-old roof destroyed in a storm is paid out at its depreciated value, not the cost of a brand-new roof, even though a brand-new roof is what you'll actually need to buy.
Replacement cost: what it costs to actually replace it, today
Replacement cost coverage pays what it currently costs to repair or replace the damaged item or structure with a new equivalent, with no deduction for depreciation. It typically costs somewhat more in premium than ACV coverage, but closes the exact gap that leaves people underinsured after a major claim.
A concrete example
Take a 10-year-old $3,000 roof damaged beyond repair. Under ACV, depreciation might reduce the payout to somewhere around $1,500 — leaving the homeowner to cover the remaining $1,500+ to actually replace it with a new roof. Under replacement cost coverage, the payout is closer to the full current cost of a comparable new roof.
How to find out which one you have
Check your policy's declarations page or the specific coverage section — it should state explicitly whether dwelling and/or personal property coverage is written on an ACV or replacement cost basis. Some policies mix the two: replacement cost on the dwelling structure, ACV on personal belongings, or vice versa.
The takeaway
If you're comparing homeowners or renters quotes and one is meaningfully cheaper than another for similar limits, check whether it's because one is written on an ACV basis — a lower premium on an ACV policy can end up costing far more at claim time than the premium difference ever saved.