The Maryland 10% Homestead Cap

Maryland’s bill-side limit is the Homestead Property Tax Credit, and its structure is unusual: every county and municipality is required to limit taxable-assessment increases on a principal residence to no more than 10% per year — some adopt less — and the state applies the same 10% limit to its own portion of the tax. A statewide ceiling that local governments may only tighten, never loosen, is the opposite of most states’ optional local caps.

What the credit actually does

The credit is applied against the tax on the assessment increase above the limit. It does not change the market value, and it does not change the phase-in arithmetic described on the triennial cycle page. What it does is bound the year-over-year growth of your taxable assessment: whatever happened in the market, the taxable assessment on a capped residence cannot rise more than 10% (or the lower local percentage) from one year to the next.

Worked example (illustrative)

Illustrative arithmetic with made-up numbers — not your property.

1. Inputs: last year’s taxable assessment $250,000; this year’s phased-in assessment $290,000 (a reassessment increase fully outside a 10% step); a county that adopted the standard 10%.
2. Step — the cap: 10% of $250,000 is $25,000, so the taxable assessment may rise to $275,000. The remaining $15,000 of increase is credit-protected: the county computes the tax as if the assessment were $275,000 and the credit covers the tax on the excess.
3. Step — the gap: the market value is untouched. If the county rate is $1.00 per $100 (illustrative), the cap saved about $150 this year — and the protected gap keeps growing while the market outruns 10% a year.

What this tells you: the credit’s value grows the longer you own and the faster the market moves — which is also why the eligibility rules below are strict. It is a long-ownership benefit by design.

What it does not tell you: the credit never applies to property that is not your principal residence, and it does not survive a transfer — see the reset rules below.

Eligibility: the six-month July 1 rule and the rest

• Principal residence: the property must be where you live, and you must have lived there at least six months of the year, including July 1.
• No transfer of ownership — a deed transfer breaks eligibility (new owners start over, see below).
• No owner-requested rezoning that raised the value.
• No substantial change in use of the property.
• The prior assessment must not have been clearly erroneous.

You apply once — not every year

Unlike most relief programs, the homestead credit is not an annual application. You apply once; eligibility continues as long as the conditions hold. New purchasers are mailed an application after the deed is recorded — if you bought a Maryland home and never received or returned one, your property may be uncapped, and the fastest check is the state’s Real Property Data Search, where eligibility and phase-in data can be reviewed.

What resets it: a transfer of ownership ends the protection — the new owner’s taxable assessment starts from the current full value once their own eligibility is established, which is why newly purchased homes in fast-moving markets often show bills far above their neighbors’.

Local variations

Counties and municipalities may adopt a lower percentage than 10% — Montgomery County’s finance department, whose page is the clearest statement of the mechanism, notes municipalities adopting tighter limits (Kensington uses 5%). Your applicable percentage depends on where the property is, and your county finance office publishes it.

What this page does not cover

Maryland’s other major credits (the homeowners’ property tax credit and the renters’ credit) are income-based relief programs outside the assessment process, and are not covered here. The homestead credit page cited below is the authority for the mechanism and eligibility rules.