Mortgage Calculator Oklahoma

The 3% homestead vs 5% general cap

Article X, Section 8B of the Oklahoma Constitution limits how much a property's fair cash value, used to calculate tax, can increase in a single year. Homestead property and agricultural land are capped at 3% annual growth. All other real property — rentals, commercial buildings, second homes — is capped at 5%. Both caps apply regardless of how much the property's actual market value rises in a given year, provided no major changes or ownership transfer occurred. This mortgage calculator Oklahoma tool assumes a new buyer's uncapped starting point.

What resets the cap

The cap isn't permanent protection tied to the property forever — an "Increase Limitation" resets to full current fair cash value whenever ownership transfers, changes, or is conveyed to another person, or when significant improvements are made. A longtime owner's capped value can sit meaningfully below current market value after years of 3% compounding, but a new buyer starts fresh at (or close to) the actual purchase price, the same general pattern several other capped-assessment states share.

State Question 847 — the August 2026 ballot measure

Passed by the Oklahoma Legislature and referred to voters as State Question 847, this constitutional amendment would lower the homestead and agricultural cap from 3% to 1.75%, and the cap on other real property from 5% to 4%, effective starting the 2027 tax year if approved. It would also restructure the existing senior freeze into a tiered structure, with protection levels based on a senior's household income relative to their specific county's median income, aiming to direct the strongest protection toward lower-income seniors specifically.

The measure has drawn some criticism alongside its support — state lawmakers backing it argue it would give Oklahoma the lowest fixed assessment cap in the nation, while critics, including some state senators, have raised concerns that tighter caps could widen the gap between what longtime owners and new buyers of comparable homes end up paying, since new buyers reset to full value on purchase while existing owners keep compounding at the lower capped rate.

The standard and additional homestead exemptions

Oklahoma's standard homestead exemption removes $1,000 from an owner-occupied home's assessed value, available to any legal Oklahoma resident whose property isn't rented or leased and who owns and occupies it as of January 1. A second, additional homestead exemption of another $1,000 is available to lower-income households — the exact income threshold cited varies somewhat by source and may differ slightly by county, so confirming the current figure with your specific county assessor is worthwhile. Separately, a Senate bill introduced in 2025 proposed raising the standard exemption to $5,000 starting in tax year 2027, though this remained under legislative consideration as of the most recent check rather than enacted law.

The Senior Valuation Limitation

Commonly called the senior freeze, this program locks a qualifying homestead's taxable fair cash value entirely once approved — the value doesn't increase further as long as the owner continues to meet the qualifications, regardless of how much the actual market value rises afterward. Eligibility requires being 65 or older as of January 1, and gross household income at or below the HUD-determined qualifying income for that specific county, which varies quite a bit — Tulsa County's 2026 threshold was $90,300, while Canadian County's was $99,000. Notably, no annual reapplication is required once granted, unless income later exceeds the limit.

The disabled veteran exemption

Veterans with a 100% VA service-connected disability rating, and their unremarried surviving spouses, receive a complete exemption from property tax on their primary residence — full assessed value, no cap, no income limit, filed with the county assessor using Form 998 alongside VA disability documentation.

How to use this mortgage calculator Oklahoma tool

Enter the home price and down payment you're working with, along with your expected interest rate and loan term. The effective tax rate field defaults to a typical statewide figure of 0.87% — adjust it if you know your specific county's actual combined rate. Add an estimated annual insurance premium (Oklahoma's severe weather exposure often pushes this above the national average), and this mortgage calculator Oklahoma shows your full estimated monthly payment.

Common mistakes to avoid

• Assuming the cap follows the property when it sells. Ownership transfer resets the assessed value to current fair cash value.
• Confusing today's 3%/5% caps with the proposed 1.75%/4% figures. The lower numbers only apply if voters approve SQ 847 and starting 2027.
• Not applying for the additional low-income homestead exemption. Confirm your county's specific income threshold rather than assuming it.
• Missing the Senior Valuation Limitation's county-specific income limit. It varies by county's HUD figure, not a single statewide number.
• Overlooking the 100% disabled veteran exemption. A complete, uncapped property tax exemption for those who qualify.

The bottom line

Oklahoma's 3%/5% assessment caps already offer real, meaningful protection against sudden tax jumps, and a live 2026 ballot measure could tighten that protection further starting in 2027. Confirm your specific county's current combined rate, file for every exemption you qualify for, and check on the outcome of State Question 847 if you're budgeting several years out — this mortgage calculator Oklahoma gives you a realistic starting point for what a home here actually costs each month today.