Updated September 5, 2026. Quick answer: Pennsylvania’s deferral is county-by-county (each political subdivision must opt in) and only postpones the increase in your tax bill, not the whole thing; but where it applies, its lien is treated exactly like an ordinary property tax lien, with no carve-out subordinating it to an existing mortgage the way most other states in this family write in.
Only the increase defers, and only where a county opts in
Pennsylvania’s Real Estate Tax Deferment Program Act, 53 Pa.C.S. §§8571-8578, gives every political subdivision; county, municipality, or school district; the power, not the obligation, to grant annual tax deferrals; Delaware County’s own published 2025 and 2026 program pages confirm this local-option structure in practice. Where adopted, an income-eligible claimant may defer only the increase in real property taxes on the homestead from one year to the next, not the underlying tax bill itself; the same narrow, increase-only mechanic New Mexico uses, though Pennsylvania’s version is lien-secured while New Mexico’s is not. No deferral is granted if deferred taxes plus every other unsatisfied lien would exceed 85% of market value, or if the outstanding mortgage principal alone already exceeds 70%; the identical pair of thresholds Florida’s statute uses, strong evidence the two states drew on the same model act.
A full ordinary tax lien, with no mortgage carve-out
Deferred taxes constitute a prior lien on the homestead in favor of the political subdivision, attaching on the same date and in the same manner as any other real estate tax lien and collected the same way. That is a meaningfully different answer from states like California, Colorado, Idaho, Minnesota, New Hampshire, or Oregon, each of which writes an explicit carve-out subordinating the deferral lien to a mortgage recorded before it: Pennsylvania’s statute contains no such carve-out at all, so the deferral lien simply takes on whatever priority an ordinary Pennsylvania real estate tax lien already carries under general law; typically senior to a mortgage, the same structural answer Oregon gives for liens recorded after its own carve-out cutoff, but here with no cutoff limiting it. The statute does not state a separate interest rate for the deferred amount.
When it comes due, and how to apply
If the deferred taxes are not paid during the claimant’s or their spouse’s lifetime, or while they continue to own the homestead, they must be paid before the homestead is conveyed to any third party, or before legal or equitable title passes to heirs by will or by statute; a due-before-the-event framing rather than a fixed number of days after it. All or part of the deferred amount may be paid at any time. Application is made annually to the political subdivision that has adopted the program; because adoption is local, a homeowner must first confirm their own county, municipality, or school district actually runs it.
Pennsylvania’s broader senior property-tax picture, covering exemptions, freezes and circuit-breaker credits, not just the deferral: property tax breaks for seniors in Pennsylvania.
How every state’s programme compares: property tax relief for seniors by state. What a deferral means in general, and who it catches out: the property-tax deferral lien trap.
Statutory text read at each state’s own legislature, revisor, or revenue agency this session. General information, not tax or legal advice; rates, caps and thresholds change most years and a county or state agency retains the final say on your own application.